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UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Analytical results for ten water-extractable Ions from B-horizon soils on St. Thomas and St. Croix, U.S. Virgin Islands and K-Ar ages for seven rocks from St. John and St. Thonas, U.S. Virgin Islands By J.B. McHugh, R.E. Tucker, and H.V. Alminas Open-File Report 89- 563 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS. 1989 CONTENTS Page Introducti on.............................................................. 1 Study area................................................................ 1 General geology........................................................... 1 Sample collection......................................................... 5 Analytical procedures..................................................... 5 Results................................................................... 9 References Ci ted.......................................................... 9 ILLUSTRATIONS Figure 1. Index map, U.S. Virgin Islands study area...................... 2 Figure 2. Generalized geologic map of St. Croix, U.S. Virgin Islands..... 3 Figure 3. Generalized geologic map of St. Thomas and St. John, U.S. Virgin Islands, with site localities of samples collected for dating using the K-Ar whole rock method.............................. 6 Figure 4. Sample site locality map for St. Croix, U.S. Virgin Islands.... 7 Figure 5. Sample site locality map for St. Thomas, U.S. Virgin Islands... 8 TABLES Table 1. Analytical methods used for determining the concentration of water-extractable ions............................................... 11 Table 2. Data results for water-extractable ions from B-horizon soils, St. Croix, U.S. Virgin Islands................................ 12 Table 3. Data results for water-extractable ions from B-horizon soils, St. Thomas, U.S. Virgin Islands............................... 18 Introduction The U.S. Geological Survey began multidisciplinary studies of the U.S. Virgin Islands in 1983. These studies are being conducted to assist the Territorial Government of the Virgin Islands by providing necessary information for future planning and resource appraisal. The initial phase of this geochemical study was designed to examine the regional geochemical characteristics of the islands and to identify possible minerals potential (Tucker and others, 1985; and Alminas and Tucker, 1987). Geochemical sampling was conducted on the three main islands of St. Croix, St. John, and St. Thomas, and numerous smaller islands in the region from 1983 to 1988. Over 1,500 samples of rocks, soils, and stream sediments were collected and analyzed for 31 elements by emission spectrography and for gold and tellurium by atomic absorption spectroscopy (Hopkins and others, 1986; McHugh and others, 1989). This open-file reports the analytical results of the water-extractable ions Na, Cl, K, Mg, Ca, Ag, Cu, Zn, F, and SO^ from B-horizon soils on St. Thomas and St. Croix. Study Area The U.S. Virgin Islands are located in the Greater Antilles Island arc some 40 miles east of Puerto Rico (fig. 1). The major islands include St. Croix, St. John, and St. Thomas. There are about 40 smaller islands in the study area concentrated near St. Thomas and St. John. The British Virgin Islands are located a few miles northeast of St. John Island. St. Croix is the largest of the U.S. Virgin Islands, with an area of 84 miles and is located 35 miles south of St. Thomas. St. John Island covers 19 square miles and St. Thomas Island contains 30 square miles. The topography of the islands is mountainous. Broad flatlands occur in the central portion of St. Croix. The highest points in the study area are Crown Mountain on St. Thomas (1,556 ft), Bordeaux Mountain on St. John (1,277 ft), and Mt. Eagle on St. Croix (1,165 ft). The coastline of St. Croix is regular. The coastlines of St. John and St. Thomas are irregular with numerous bays. Small fringing coral reefs are common in shallow water. The climate in the Virgin Islands is maritime tropical. The average annual rainfall at higher elevations is 50-60 inches per year and at lower elevations is 20-30 inches per year. There is no well-defined wet or dry season. The temperature is generally constant between 80 and 85°F. The vegetation is generally not native to the islands and consists of thorny brush and Hurricane grass in the formerly cleared areas. The uncleared portions of the more mountainous areas are covered by dense tropical forest with a few large trees and a dense undergrowth of brushes and vines. There are only a few free-flowing streams and these are frequently intermittent. General Geology The natural history and geology of the Virgin Islands have been studied by many naturalists and scientists over the years (Shomburgk, 1837; Cleve, 1881; Meyerhoff, 1926; Donnelly, 1959, 1966; Helsley, 1960; Whetten, 1966; Alminas and Tucker, 1987; Tucker, 1987). Most of these studies have focused on the stratigraphic sequences and rock types. 69* «6 63' 60' > 'Q VIRGIN ISLANDS ATLANTIC OCEAN \DC \X DOMINICAN REPUBLIC PUERTO RICO VIRGIN <3ORDA - ST. JOHN GREATER ANTILLES ST. CROIX flStMARTIN Q ^ ANTIGUA, GUADELOUPE MARTINIQUE CARIBBEAN SEA a VENEZUELA 1OO SO 1OO VIRGIN ISLANDS MILES 1OO 0 BLHHSECE 10O =r~ 200 ~F= KILOMETERS 200 3OO Figure 1. Index map of the Virgin Islands and vicinity, The oldest exposed rocks on St. Croix are Upper Cretaceous in age. The rocks, composed of volcanic sandstones, mudstones, limestone beds, and siliceous siltstones, are collectively called the Mt. Eagle Group (Cederstrom, 1941, 1950; Whetten, 1966). The oldest rocks are found in the Allandale (2,000 ft in thickness) and Caledonia (approximately 18,000 ft in thickness) Formations which are interspersed vertically and laterally across the island. Overlying these Formations is the Cane Valley Formation. These rocks are a sequence of mudstones and tuffaceous sandstones up to 1,700 ft in thickness. Overlying the Cane Valley Formation is the Judith Fancy Formation. This series of rock is approximately 15,000 ft of interlayered tuffaceous sandstones, thin limestone beds, mudstones, and volcanic pebble conglomerate. The rocks of the Judith Fancy Formation typically show a marked difference across the island. The island is bisected by a wide, centrally located graben. The graben infilling is some 7,000 ft of mudstone. The Jealousy Formation includes the upper 1,400 ft of exposed montmorillonitic mudstone. These sediments are believed to be upper Oligocene in age (Whetten, 1966). Overlying the Jealousy Formation is the Kingshill Marl. This unit is approximately 600 ft of fossil coral reefs exposed on the coastal plain. Igneous rocks include the Fountain gabbro, located in the northwestern highlands and the Southgate diorite located in the eastern portion of the island (Whetten, 1966). Numerous dikes, ranging in composition from very mafic to rhyolitic, are found throughout the island but are dominant near the east end. Rhyolitic plugs and intrusive bodies were observed in several localities throughout the island during this geochemical study. A generalized geologic map of St. Croix is given on figure 2. St. Croix has undergone rather extensive alteration and mineralization. The mineralization consists of base and precious metals, primarily associated with the graben walls, possible intrusives in the northwestern highlands, and areas of folding on the eastern portion of the island (Alminas and Tucker, 1987; McHugh and others, 1989). Sand-sized grains of naturally occurring native tin and lead are found throughout the northwestern highlands and within the graben. Gold concentrations above 20 ppb occur in several areas near the graben walls, in the northwestern highlands, and in quartz veins cutting the Southgate diorite (Alminas and Tucker, 1987; McHugh and others, 1989). St. Thomas and St. John are composed predominantly of volcanic rocks. The southern portions of both islands are composed of felsic flows, mafic dikes and thin beds of radiolarites. Collectively, these three units make up the Water Island Formation (Donnelly, 1966). Uncomformably overlying the Water Island Formation is the Louisenhoj Formation. The Louisenhoj Formation is a thick sequence of andesitic ejecta and coarse tuff beds. The Outer Brass Limestone overlies the Louisenhoj Formation. This unit is predominantly siliceous limestone with about 10 percent interbedded crystal tuffs. The Outer Brass Limestone is overlain by the Tutu Formation. The Tutu Formation is composed of fine- to coarse-grained volcanic wackes made up of weathered Louisenhoj rocks. Thin limestone beds are interlayered with the wackes. The Tutu Formation on Grass Cay, Mingo Cay, Lovango Cay, and Mary Point is a garnetiferous skarn. Numerous iron veins cut the skarn. The Coki Point megabreccia lithofacies of the Tutu Formation are composed of large fossil iferous limestone blocks. The fossil evidence suggests an Albian age (113-93.5 MA). The Congo Cay Limestone Member is coarsely crystalline limestone that is exposed only on Congo Cay in the U.S. Virgin Islands. 50' 64°4O 30 45- 1740 - | G | GABBRO D~l DIORITE -f- ANTICLINE -4 SYNCLINE -r-»- THRUST RECENT |QO I ALLUVIUM MIOCENE JMm| KINGSHILL MARL OLIGOCENE |oj | JEALOUSY FORMATION CRETACEOUS | Kj | JUDITH FANCY FORMATION |Kcv | CANE VALLEY FORMATION | Ko | ALLANDALE FORMATION I KC 1 CALEDONIA FORMATION 1 0 1 MILES 2 3 4567 KILOMETERS Figure 2 Generalized geologic map of St. Croix, U.S. virgin Islands. The Hans Lollik Formation crops out on the two Hans Lollik Islands. This unit is very similar mineralogically and texturally to the Louisenhoj Formation. It should be noted that the geology of the British Virgin Islands as described by Helsley (1960) is not a simple continuum of the layered sequence in the U.S. Virgin Islands set forward by Donnelly (1966). A gener- alized geologic map for St. Thomas and St. John is given on figure 3. In conjunction with the geochemical study, five rocks from the Water Island Formation and two rocks from the Louisenhoj Formation were dated by K-Ar whole rock technique. The felsic rocks range in age from 30.9 to 65.8 MA. The andesitic rocks were dated at 38.6 and 42.1 MA (fig. 3) (Tucker, 1987). These dates indicate the Water Island and Louisenhoj Formations are much younger than previously believed. Accretionary processes are undoubtedly responsible for the addition of the older sedimentary rocks onto an existing felsic platform. Felsic activity has continued over an extended period. Interpretations of the data from stream-sediment concentrates, rocks, and soils indicate extensive mineralization occurs throughout the study area (Tucker and others, 1985; Alminas and Tucker, 1987; Tucker, 1987). The mineralization consists of precious and base metals associated with sulfide- rich igneous bodies and zones of hydrothermal alteration. Throughout the study area, the mineralization transects the major rock units. Sample Collection Geochemical sampling was conducted from 1983 to 1988 on the three main islands of St. Croix, St. John, and St. Thomas, and numerous smaller islands in the region. Over 1,500 rock, soil, and stream-sediment samples were collected and analyzed for 31 elements by 6-step D.C.-arc emission spectrography (Hopkins and others, 1986; and McHugh and others, 1989). Gold analysis by atomic absorption spectroscopy is presented in McHugh and others (1989). Analytical results for B^ cereus population densities from A-horizon soils and ten water extractable ions from A- and B-horizon soils on St. John are presented in Tucker and others (1989). Sample collection was conducted by H.V. Alminas and R.E. Tucker. B-horizon soil samples were collected throughout the study area in conjunction with stream-sediment and rock-chip sampling. The B horizon or a zone of rather distinct reddening generally occurred at a depth of between 12 to 18 inches. In cases where no distinct B-horizon soil was present, such as in the graben infilling on St. Croix a sample was collected at a depth of approximately 18 inches. The leaf litter was cleared from an area approximately 12 inches in diameter. The top 4 inches of soil was loosened, hand mixed, placed in a cloth bag, and allowed to air dry. Approximately 1.5 pounds of soil were collected at all sample localities. The sample locality maps for St. Croix and St. Thomas are given on figures 4 and 5, respectively. Analytical Procedures A water-leach extraction of the soil samples was conducted to examine the ionic concentrations of some metals and anions that could be readily available within the secondary environment. The technique involved placing 1 g of soil in a test tube with 10 ml of deionized water. The soil was thoroughly mixed and the tube was placed on its side. The samples were hand mixed every other day. Time phased dissolution experiments indicated equilibrium was reached in 5 to 7 days (Tucker, 1987). At the end of 7 days, the samples were centrifuged and the supernatant liquid was placed in a clean test tube. OS'00* Alluvium Hons Lollik Fm. Tutu Fm. _ Outer Brass Lm. VD Louisenhoj Fm. __ [3 Water Island Fm. GCZIntrusive MILES O 1 2 J 4 » 0 7 ST115 ST120 SJ765R1 40.7 ±1.1 Ma 65.8 ± 2.9 Ma 30.9 + 0.3 Ma SJ48 50.2 ± 5.7 Ma SJ685 37.7 -i- 1.1 Ma SJ747R1 42.1 ± 0.6 SJ748 38.6 -i- 0.8 Ma Figure 3 Generalized geologic map of St. Thomas and St. John, U.S. Virgin Islands, with site localities of samples collected for K-Ar whole rock dating. 64*55' 17*5O' 1 740 140 144 43 44 N228 215 230 229 FREDERICKST MILES Figure 4 Sample site locality map for St. Croix, U.S. Virgin Islands 65 06 CS'OO 04*48' 00 2030 Figure 5 Sample site locality map for St. Thomas, U.S. Virgin Islands. The concentration of dissolved ionic constituents was determined by atomic absorption and ion chromatography (table 1). The concentration of Mg, Na, Ca, K, Cl, S04 , F, Zn, Cu, and Ag was determined in each sample. Results Water extractable ion data from St. Croix and St. Thomas are given in tables 2 and 3, respectively. In each table, column 1 contains the USGS- assigned sample number. The first digit represents the year the sample was collected; 3 for 83, 4 for 84, etc. The alpha characters represent St. Croix (SC) or St. Thomas (ST). The next 3 numerals represent the site designator. The last alpha character, S, designates the sample as a soil. References Alminas, H.V., and Tucker, R.E., 1987, Lead, tin, and precious-metal mineralization in the U.S. Virgin Islands: Society of Mining Engineers annual meeting preprint number 87-108. Cederstrom, D.J., 1941, Notes on the physiography of St. Croix, Virgin Islands: American Journal of Science, v. 239, no. 8, p. 553-578. ____1950, Geology and ground-water resources of St. Croix, Virgin Islands: U.S. Geological Survey Water Supply Paper 1067, 117 p. Cleve, P.T., 1881, Outline of the geology of the north-eastern West India Islands: Annals of the New York Academy of Sciences, v. 2, p. 185-192. Donnelly, T.W., 1959, Geology of St. Thomas and St. John, Virgin Islands: Ph.D. thesis, Princeton University, 191 p. ___1966, Geology of St. Thomas and St. John, U.S. Virgin Islands: Geological Society of America Memoir 98, p. 85-176. Fishman, J.J., and Pyen, G., 1979, Determination of selected anions in water by ion chromatography: U.S. Geological Survey Water Resources Investigations 79-101, 30 p. Helsley, C.E., 1960, Geology of the British Virgin Islands, Princeton University: Ph.D. thesis, 219 p. Hopkins, R.T., Tucker, R.E., Roemer, T.A., Sharkey, J.D., and Alminas, H.V., 1986, Analytical results from a geochemical survey of the U.S. Virgin Islands: U.S. Geological Survey Open-File Report 86-86, 229 p. McHugh, J.B., Tucker, R.E., Hopkins, R.T., Roemer, T.A., and Alminas, H.V., 1989, Gold, silver, tellurium, and spectrographic analysis for rock and soil samples from the U.S. Virgin Islands: U.S. Geological Survey Open- File Report 89-355, 64 p. Meyerhoff, H.A., 1926, Scientific survey of Puerto Rico and the Virgin Islands: New York Academy of Sciences, v. 14, parts 1-2, p. 71-219. Perkin-Elmer Corporation, 1976, Analytical methods for atomic-absorption spec- trophotometry: Norwalk, Connecticut, Perkin-Elmer Corporation, 586 p. ____1977, Analytical methods for atomic-absorption spectrophotometry, using the HGA graphite furnace: Norwalk, Connecticut, Perkin-Elmer Corporation, 208 p. Shomburgk, R.H., 1837, Die Jungfrau-Inseln, in geologischer und klimatischer hinsicht: Berghaus Almanach fur Erdkunde, p. 367-455. Tucker, R.E., 1987, A geochemical study of St. John, U.S. Virgin Islands: Ph.D. thesis, Colorado School of Mines, T-3438, 405 p. Tucker, R.E., Alminas, H.V., and Hopkins, R.T., 1985, Geochemical evidence for metallization on St. Thomas and St. John, U.S. Virgin Islands: U.S. Geological Survey Open-File Report 85-297, 46 p. Tucker, R.E., McHugh, J.B., and Alminas, H.V., 1989, A study of Bacillus cereus distributions and ten water extractable ions from soils on St. John, U.S. Virgin Islands: U.S. Geological Survey Open-File Report 89- , p. Whetten, J.T., 1966, Geology of St. Croix, U.S. Virgin Islands: Geological Society of America Memoir 98, p. 177-239. 10 Table 1. Analytical methods used for determining the concentration of water-extractable ions Constituents Method Reference S04 , C1, F Ion chromatography Fishman and Pyen (1979) Ca, Mg, Na, K, Zn flame atomic-absorption Perkin-Elmer spectrophotometry Corp. (1976) Ag, Cu Flameless atomic- Perkin-Elmer absorption Corp. (1977) spectrophotometry 11 TABLE 2. DATA RESULTS FOR UATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. CROIX, U.S. VIRGIN ISLANDS [N, not detected; <, detected but below the limit of determination shown; >, determined to be greater than the value shown.] Sample LAT LONG CA(PPH) MG(PPH) NA(PPH) K(PPM) ZN(PPM) CU(PPH) AG(PPB) CL(PPH) S04(PPM) F(PPM) 4SC001S 4SC002S 4SC003S 4SC004S 4SC005S 4SC006S 4SC007S 4SC008S 4SC009S 4SC010S 4SC011S 4SC012S 4SC013S 4SC014S 4SC015S 4SC016S 4SC017S 4SC018S 4SC019S 4SC020S 4SC021S 4SC022S 4SC023S 4SC024S 4SC025S 4SC026S 4SC027S 4SC028S 4SC029S 4SC030S 4SC031S 4SC032S 4SC033S 4SC034S 4SC035S 4SC036S 4SC037S 4SC038S 4SC039S 4SC040S 4SC041S 4SC042S 4SC043S 4SC044S 4SC045S 17 46 1 17 46 17 17 46 8 17 45 54 17 45 46 17 45 11 17 45 18 17 45 1 17 46 2 17 46 17 17 46 47 17 46 39 17 46 51 17 46 23 17 46 27 17 46 33 17 46 34 17 46 39 17 45 39 17 45 40 17 45 38 17 45 37 17 45 50 17 44 48 17 45 54 17 44 1 17 44 18 17 44 59 17 45 16 17 44 23 17 44 50 17 45 2 17 45 10 17 45 10 17 45 18 17 45 8 17 44 47 17 45 36 17 45 37 17 45 47 17 45 46 17 46 14 17 45 50 17 45 2 17 44 28 64 49 21 64 48 37 64 49 7 64 49 44 64 50 1 64 49 47 64 49 39 64 49 19 64 45 49 64 45 40 64 45 43 64 46 10 64 46 35 64 47 30 64 47 22 64 47 20 64 48 7 64 47 39 64 46 22 64 46 55 64 46 59 64 47 42 64 47 57 64 48 54 64 46 7 64 48 55 64 48 24 64 47 37 64 47 16 64 49 0 64 48 35 64 48 26 64 48 37 64 51 13 64 50 46 64 50 24 64 50 5 64 50 21 64 49 25 64 52 20 64 52 23 6^ 52 28 o4 53 4 64 53 28 64 53 2 405 730 670 90 300 24 58 325 770 500 190 200 195 270 70 215 360 230 740 710 82 690 120 270 810 640 830 870 720 135 285 410 370 435 175 930 86 115 50 760 510 235 610 260 540 110 130 92 42 106 44 54 95 190 138 140 115 150 115 63 94 168 145 40 92 130 148 82 85 120 235 100 140 130 56 108 198 125 70 102 128 60 45 34 175 145 80 120 58 64 28 15 44 120 32 80 43 49 75 36 126 83 100 53 76 47 52 57 23 28 680 37 96 53 31 62 38 138 74 126 94 38 66 49 58 48 178 106 63 46 75 23 47 22 21 114 230 78 10 162 14 22 18 95 70 62 116 56 29 24 128 66 68 48 86 42 56 12 22 145 66 56 122 140 5 24 68 94 33 16 28 11 10 6 112 86 84 65 56 70 <-2 <.2 <.2 <.2 <.2 .4 .4 <.2 <.2 <.2 .4 .3 <.2 .2 .5 .3 .2 .2 <.2 <.2 1.5 <.2 .3 .2 <.2 <-2 <.2 <.2 .2 <.2 <-2 .2 <.2 <.2 <.2 <.2 .2 <.2 .2 <.2 <.2 .3 <.2 .3 <.2 1.2 <1.0 <1.0 <1.0 <1.0 1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.0 1.7 <1.0 <1.0 1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.5 <1.0 1.1 «1.0 1.6 O .0 si .0 <1 .0 <1 .0 t1 .0 =1 .0 =1 .0 :1 .0 :1 .0 :1 .0 '1 .0 :1 .0 :1 .0 :1 .0 1.5 1.0 1.0 1.0 1.0 16 10 12 12 11 8 6 9 26 15 19 38 21 14 9 11 18 12 11 30 28 10 28 13 46 14 14 28 20 25 20 26 41 17 8 16 17 15 6 24 22 18 44 10 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 30 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 47 <20 <20 <20 <20 <20 <20 <20 <20 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 6 <5 <5 <5 <5 <5 <5 <5 <5 7 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 ;5 <5 1.4 12 <20 <5 12 TABLE 2. DATA RESULTS FOR UATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. CROIX, U.S. VIRGIN ISLANDS--Continued Sample LAT LONG CA(PPM) MG(PPM) NA(PPM) K(PPM) ZN(PPM) CU(PPM) AG(PPB) CL(PPM) S04(PPM) F(PPM) 4SC046S 4SC047S 4SC048S 4SC049S 4SC050S 4SC051S 4SC052S 4SC053S 4SC054S 4SC055S 4SC056S 4SC057S 4SC058S 4SC059S 4SC060S 4SC061S 4SC062S 4SC063S 4SC064S 4SC065S 4SC066S 4SC067S 4SC068S 4SC069S 4SC070S 4SC071S 4SC072S 4SC073S 4SC074S 4SC075S 4SC076S 4SC077S 4SC078S 4SC079S 4SC080S 4SC081S 4SC082S 4SC083S 4SC084S 4SC085S 4SC086S 4SC087S 4SC088S 4SC089S 4SC090S 17 44 49 17 44 53 17 45 0 17 45 3 17 45 0 17 43 47 17 43 50 17 43 53 17 44 21 17 44 24 17 44 29 17 44 5 17 44 26 17 44 32 17 44 21 17 44 7 17 44 3 17 43 26 17 42 43 17 42 55 17 42 51 17 43 4 17 43 4 17 43 6 17 43 55 17 45 34 17 46 6 17 45 37 17 45 17 17 44 54 17 44 46 17 44 37 17 44 29 17 44 19 17 44 10 17 44 3 17 43 59 17 44 21 17 44 46 17 45 14 17 44 52 17 44 17 17 43 37 17 43 23 17 42 35 64 52 36 64 52 6 64 52 8 64 51 42 64 51 43 64 52 38 64 51 59 64 51 51 64 51 41 64 51 38 64 51 40 64 51 24 64 51 12 64 50 53 64 50 19 64 50 2 64 49 38 64 52 0 64 52 0 64 51 38 64 51 4 64 51 12 64 50 40 64 49 58 64 49 21 64 45 50 64 45 24 64 45 13 64 46 9 64 46 26 64 46 52 64 47 18 64 47 46 64 46 38 64 47 2 64 47 28 64 46 1 64 45 54 64 46 3 64 45 16 64 45 14 64 45 17 64 45 17 64 45 54 64 47 13 240 240 820 180 570 530 810 350 670 320 320 305 570 440 530 630 74 385 500 470 470 480 740 670 325 1,100 590 790 830 860 770 960 220 1,050 700 245 820 930 1,050 850 900 450 930 800 790 76 62 152 72 152 144 83 30 92 120 122 76 72 85 80 84 34 46 92 148 120 76 92 118 70 114 50 66 70 86 162 106 72 62 40 76 66 72 92 60 84 20 108 50 96 66 50 34 34 28 48 22 20 40 30 28 28 15 32 35 21 60 44 66 76 38 65 68 36 84 45 35 49 50 69 57 36 75 40 29 660 24 30 40 41 48 24 66 15 26 28 42 195 15 30 104 78 26 160 58 58 32 42 34 42 42 26 30 40 50 72 29 58 112 25 215 90 135 120 64 56 52 12 28 116 22 70 62 120 50 76 32 140 58 122 .2 .3 .2 <.2 .3 <.2 <.2 <.2 .4 <-2 <.2 <.2 <.2 <.2 <.2 <.2 .2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <-2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 1.2 <1.0 1.3 <1 .0 e1 .0 2.0 1.1 <1.0 1.0 0.0 1.4 1.0 1.2 1.2 1.2 1.0 1.7 1.0 =1.0 1.0 1.0 :1 .0 :1 .0 :1 .0 :1 .0 : 1 .0 :1 .0 :1 .0 1.5 1.0 :1 .0 :1 .0 1.3 1 .0 1.0 1 .0 1.0 1.0 1.0 1.0 1.1 1.0 1.0 1.0 1.0 10 20 27 8 11 11 15 12 17 13 11 10 12 10 12 9 8 7 14 14 12 12 17 25 20 200 14 22 20 15 15 20 5 13 7 63 13 23 18 13 27 14 24 7 18 <20 58 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 13 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 13 TABLE 2. DATA RESULTS FOR WATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. CROIX, U.S. VIRGIN ISLANDS--Continued Sample LAT LONG CA(PPM) MG(PPM) NA(PPM) K(PPM) ZN(PPM) CU(PPM) AG(PPB) CL(PPM) S04CPPM) F(PPM) 4SC091S 4SC092S 4SC093S 4SC094S 4SC095S 4SC096S 4SC097S 4SC098S 4SC099S 4SC100S 4SC101S 4SC102S 4SC103S 4SC104S 4SC105S 4SC106S 4SC107S 4SC108S 4SC109S 4SC110S 4SC111S 4SC112S 4SC113S 4SC114S 4SC115S 4SC116S 4SC117S 4SC118S 4SC119S 4SC120S 4SC121S 4SC122S 4SC123S 4SC124S 4SC125S 4SC126S 4SC127S 4SC128S 4SC129S 4SC130S 4SC131S 4SC132S 4SC133S 4SC134S 4SC135S 17 42 54 17 43 25 17 43 35 17 43 41 17 43 50 17 44 5 17 45 38 17 45 9 17 45 15 17 45 13 17 45 5 17 44 52 17 44 15 17 44 24 17 44 8 17 44 24 17 44 44 17 44 46 17 43 40 17 43 22 17 43 14 17 43 8 17 43 30 17 42 49 17 42 19 17 42 9 17 42 35 17 42 29 17 42 59 17 42 53 17 43 6 17 43 16 17 43 40 17 43 57 17 42 55 17 43 9 17 42 5 17 43 17 17 43 48 17 42 52 17 43 2 17 42 37 17 43 0 17 43 25 17 43 34 64 47 27 64 47 37 64 47 16 64 46 49 64 46 29 64 45 34 64 44 44 64 44 30 64 44 39 64 43 36 64 44 4 64 43 32 64 43 15 64 43 39 64 43 55 64 44 43 64 44 37 64 44 18 64 44 33 64 44 27 64 44 51 64 45 18 64 44 1 64 42 45 64 42 47 64 43 10 64 43 23 64 43 47 64 43 50 64 44 16 64 43 33 64 42 54 64 43 29 64 f 2 43 64 46 52 64 46 27 64 47 17 64 48 8 64 48 20 64 48 3 &4 *3 51 64 48 40 64 49 18 64 49 26 64 48 59 690 830 800 600 810 620 1,000 1,050 360 380 980 390 830 590 700 590 560 730 590 720 250 600 770 740 770 570 450 770 600 590 890 760 480 195 850 380 245 720 400 640 760 840 300 510 490 690 830 800 600 810 620 1,000 1,050 360 380 980 390 830 590 700 590 560 730 590 720 250 600 770 740 770 570 450 770 600 590 890 760 480 195 850 380 245 720 400 640 760 840 300 510 490 92 72 56 55 64 44 118 102 26 92 110 105 75 24 44 30 30 32 55 48 20 40 56 90 172 138 48 138 60 66 80 86 24 78 108 124 82 70 96 80 95 52 70 105 78 20 32 64 35 23 60 33 40 23 42 43 107 64 46 54 36 34 37 27 47 58 40 40 152 74 92 24 72 92 21 24 36 30 82 44 72 600 82 58 47 41 50 68 38 70 195 <.2 40 <.2 46 <.2 78 <.2 130 <.2 100 <.2 210 <.2 102 <.2 34 <.2 84 <.2 160 <.2 215 <.2 66 <.2 22 <.2 88 <.2 54 <.2 65 <.2 35 <.2 25 <.2 12 <.2 20 <.2 40 <.2 52 <.2 70 .5 56 <.2 150 .3 38 <.2 265 <.2 30 <.2 48 <.2 80 <.2 44 <.2 24 <.2 20 <.2 110 1.7 270 <.2 20 <.2 92 <.2 75 <.2 240 <.2 90 <.2 32 <.2 44 <.2 78 <.2 36 <.2 <1 .0 <1 .0 <1 .0 <1 .0 <1 .0 <1 .0 <1 .0 <1 .0 «1 .0 <1 .0 1.0 1.4 1.2 1.4 <1 .0 :1 .0 O .0 :1 .0 :1 .0 :1 .0 1 .0 1 .0 :1 .0 :1 .0 :1 .0 :1 .0 :1 .0 :1 .0 :1 .0 :1 .0 1.0 :1 .0 :1 .0 1.0 ;1 .0 '1 .0 1.0 1.0 1.0 1.0 1.0 1 .0 1.0 1.0 1.0 11 8 18 7 15 23 11 27 13 18 14 37 18 20 16 19 13 13 14 19 7 27 20 275 24 14 8 32 18 11 18 9 <5 9 36 21 22 14 28 24 22 17 17 22 20 24 <20 <20 21 <20 22 <20 <20 24 <20 <20 46 <20 <20 29 24 <20 <20 <20 <20 <20 23 <20 26 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 14 TABLE 2. DATA RESULTS FOR UATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. CROIX, U.S. VIRGIN ISLANDS--Continued Sample LAT LONG CA(PPM) MG(PPM) NA(PPM) K(PPM) ZN(PPM) CU(PPM) AG(PPB) CL(PPM) S04(PPM) F(PPH) 4SC136S 4SC137S 4SC138S ASC139S ASCUOS ASC141S ASC142S 4SC143S ASC148S ASC150S ASC154S ASC156S 4SC157S 4SC200S ASC201S 4SC202S 4SC203S 4SC204S 4SC205S ASC206S 4SC207S ASC208S 4SC209S 4SC210S 4SC211S ASC212S 4SC213S ASC21AS 4SC215S 4SC216S 4SC217S 4SC218S 4SC219S 4SC220S 4SC221S 4SC222S 4SC223S 4SC224S 4SC225S 4SC226S 4SC227S 4SC228S 4SC229S 4SC230S 4SC231S 17 42 27 17 41 33 17 41 40 17 41 55 17 41 47 17 41 21 17 42 16 17 42 44 17 45 38 17 45 34 17 47 26 17 47 12 17 46 8 17 45 20 17 45 31 17 45 36 17 45 34 17 45 38 17 45 18 17 45 13 17 44 48 17 45 12 17 45 0 17 45 1 17 44 53 17 44 36 17 44 17 17 44 6 17 44 1 17 45 41 17 45 33 17 45 1 17 45 24 17 45 5 17 44 56 17 44 57 17 44 57 17 45 14 17 44 33 17 44 13 17 44 20 17 44 6 17 £4 10 1, 43 39 17 44 12 64 49 16 64 48 52 64 48 23 64 49 7 64 49 31 64 49 25 64 49 43 64 49 53 64 48 50 64 48 13 64 37 32 64 37 10 64 39 57 64 34 6 64 34 22 64 34 31 64 34 39 64 34 48 64 35 1 64 35 33 64 36 25 64 34 20 64 34 35 64 34 53 64 35 59 64 36 37 64 37 7 64 37 24 64 37 38 64 39 12 64 38 44 64 38 17 64 37 38 64 37 40 64 37 33 64 37 15 64 36 46 64 36 23 64 38 59 64 38 39 64 36 56 64 36 39 64 38 0 64 38 43 64 39 3 880 730 890 870 1,050 780 215 1,100 45 125 890 790 75 275 34 540 150 270 380 510 205 240 330 470 570 350 245 540 480 430 120 60 180 235 370 530 340 300 560 160 370 45 600 290 440 880 730 890 870 1,050 780 215 1,100 45 125 890 790 75 275 34 540 150 270 380 510 205 240 330 470 570 350 245 540 480 430 120 60 180 235 370 530 340 300 560 160 370 45 600 290 440 78 98 175 128 136 76 255 154 25 52 308 128 46 110 290 204 96 100 100 142 82 115 155 156 180 102 38 70 155 64 80 150 124 96 115 205 158 130 158 70 180 56 76 105 105 50 62 126 59 46 56 4,100 89 42 65 118 530 135 405 480 136 102 100 56 70 85 70 104 54 126 77 55 46 105 36 970 102 71 46 79 78 98 70 78 82 1v2 340 122 58 81 96 <.2 <1.0 100 <.2 <1.0 128 <.2 <1.0 96 <.2 <1.0 150 <.2 <1.0 80 <.2 <1.0 210 <.2 1.0 112 <.2 <1.0 6 <.2 <1.0 40 <.2 <1.0 178 <.2 <1.0 78 <.2 <1.0 38 <.2 <1.0 68 <.2 <1.0 260 1,8 2.7 112 <.2 <1.0 88 <.2 <1.0 68 <.2 <1.0 62 <.2 <1.0 140 <,2 . <1.0 116 <.2 <1.0 62 <.2 <1.0 88 <.2 <1.0 96 <.2 <1.0 240 <.2 <1.0 76 <.2 <1.0 82 <.2 <1.0 88 <.2 <1.0 148 <.2 <1.0 74 <.2 <1.0 48 .4 1.7 102 1.0 1.2 80 <.2 <1.0 75 .2 <1.0 104 <.2 <1.0 190 <.2 <1.0 82 <.2 <1.0 92 <.2 <1.0 130 <.2 <1.0 52 .2 <1.0 75 <.2 <1.0 52 .2 1.2 36 <.2 <1.0 54 .2 <1.0 68 <.2 <1.0 <1.0 1.6 <1.0 <1.0 <1.0 <1.0 2.0 <1.0 <1.0 2.0 2.2 <1.0 1.4 2.6 2.5 1.8 2.2 1.1 1.2 1.0 1.3 1.0 1.4 <1.0 1.0 1.2 <1.0 <1.0 1.0 <1.0 6.0 1.6 3.2 3.0 1.0 2.9 1.1 2.3 <1.0 1.9 <1.0 5.7 1.0 2.7 1.0 21 50 45 23 35 16 4,000 38 <5 14 43 910 76 80 68 54 23 28 30 33 20 21 24 19 49 16 20 22 28 15 79 14 21 10 10 22 20 16 20 25 25 103 182 11 18 <20 <20 <20 <20 <20 <20 580 <20 <20 <20 <20 122 <20 40 67 <20 <20 <20 <20 <20 <20 <20 <20 27 <20 <20 <20 <20 <20 <20 76 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 24 36 <20 <20 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 13 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 15 TABLE 2. DATA RESULTS FOR WATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. CROIX, U.S. VIRGIN ISLANDS--Continued Sample LAT LONG CA(PPM) MG(PPM) NA(PPM) K(PPM) ZN(PPM) CU(PPM) AG(PPB) CL(PPM) SOA(PPH) F(PPM) 4SC232S 4SC233S 4SC234S 4SC235S 4SC236S 4SC237S 4SC238S 4SC239S 4SC240S 4SC241S 4SC242S 4SC243S 4SC244S 4SC245S 4SC246S 4SC247S 4SC248S 4SC249S 4SC250S 4SC251S 4SC252S 4SC253S 4SC254S 4SC255S 4SC256S 4SC257S 4SC258S 4SC259S 4SC260S 4SC261S 4SC262S 4SC263S 4SC264S 4SC265S 4SC266S 4SC267S 4SC268S 4SC269S 4SC270S 4SC271S 4SC272S 4SC273S 4SC274S 4SC275S 4SC276S 17 44 26 17 44 50 17 44 48 17 45 3 17 45 6 17 44 18 17 44 2 17 43 59 17 44 5 17 43 10 17 43 13 17 43 22 17 43 8 17 43 46 17 44 37 17 44 30 17 44 34 17 45 31 17 44 47 17 44 26 17 44 28 17 44 43 17 44 27 17 44 17 17 43 54 17 43 25 17 43 30 17 42 38 17 46 58 17 46 24 17 46 34 17 46 9 17 46 16 17 45 31 17 41 43 17 41 19 17 41 29 17 41 30 17 41 33 17 41 38 17 42 6 17 41 9 17 41 33 17 42 8 17 42 0 64 39 33 64 38 53 64 38 51 64 39 3 64 40 4 64 41 24 64 41 31 64 41 30 64 41 17 64 41 27 64 40 42 64 41 42 64 41 14 64 40 10 64 40 29 64 40 53 64 40 47 64 40 19 64 41 22 64 41 39 64 41 47 64 42 2 64 42 4 64 42 37 64 42 19 64 42 4 64 42 13 64 42 14 64 45 0 64 45 1 64 45 4 64 44 59 64 44 25 64 40 42 64 53 15 64 52 49 64 52 14 64 51 47 64 50 53 64 51 22 64 50 37 64 50 15 64 50 25 64 51 5 64 52 20 190 235 510 440 125 430 175 560 560 220 360 100 530 320 275 420 320 590 130 510 810 300 380 185 620 810 60 68 450 740 85 820 115 265 870 720 860 770 58 800 560 260 180 145 920 102 104 88 166 112 138 98 142 92 82 90 130 118 142 128 158 122 182 88 160 264 110 196 84 40 174 70 82 60 86 52 85 105 70 100 110 52 78 222 64 72 90 44 40 60 86 64 65 90 77 47 84 77 40 120 82 135 120 102 280 58 75 89 130 120 92 80 85 90 83 74 112 330 130 56 91 55 100 115 118 127 90 54 650 120 200 1,000 390 430 72 74 .2 52 <.2 66 <.2 96 <.2 82 <.2 92 <.2 36 .2 72 <.2 76 <.2 35 <.2 85 <.2 115 .9 42 <.2 98 .2 46 <.2 125 .2 54 <.2 45 <.2 28 .2 65 <.2 , 82 <.2 32 .2 56 <.2 44 .3 40 <.2 88 <.2 44 .6 48 .3 72 <.2 105 <.2 50 .4 92 <.2 130 .6 32 .3 10 <.2 130 <.2 20 <.2 55 <.2 135 1.9 38 <.2 22 <.2 16 <.2 24 <.2 15 <.2 15 <.2 <1.0 2.9 <1 .0 1 .0 <1.0 <1.0 <1.0 1.5 <1 .0 1 .3 <1.0 <1.0 <1.0 1.0 <1.0 <1.0 <1.0 1.0 <1.0 <1.0 <1.0 <1.0 1 .2 <1 .0 <1.0 <1.0 <1.0 1.4 <1.0 2.2 <1.0 <1.0 <1.0 1.2 <1.0 <1.0 <1 .0 1.7 <1.0 <1.0 <1.0 <1.0 1.0 1.3 <1.0 <1.0 1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.8 1.0 5.8 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.0 5.2 <1.0 5.9 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.8 6.4 <1.0 <1.0 <1.C <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 23 9 29 22 40 33 43 62 91 50 13 28 24 16 16 16 20 31 19 28 33 80 27 22 24 47 19 28 44 29 15 27 17 16 52 120 36 28 170 22 24 72 12 64 30 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 61 <20 <20 <20 <20 <20 <20 82 <20 <20 <20 <20 <20 22 94 <20 <20 45 <20 <20 <20 47 <20 <20 <20 <20 <20 21 <20 <20 <20 <20 51 <20 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 10 <5 16 TABLE 2. DATA RESULTS FOR UATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. CROIX, U.S. VIRGIN ISLANDS--Continued Sample 4SC277S 4SC278S 4SC279S 4SC280S 4SC281S 4SC282S 4SC283S 4SC284S 4SC285S 4SC286S 4SC287S 4SC288S 4SC289S 4SC290S 4SC291S 4SC292S 4SC293S 4SC294S 4SC295S 4SC296S 4SC297S 4SC298S 4SC300S LAT LONG CA(PPH) MG(PPH) NA(PPH) K(PPH) ZN(PPH) CU(PPH) AG(PPB) CL(PPH) S04(PPH) F(PPM) 17 41 52 64 52 43 17 42 13 64 51 46 17 42 30 64 51 9 17 42 35 64 50 40 17 41 34 64 49 27 17 41 53 64 49 47 17 42 30 64 49 47 17 42 38 64 50 13 17 45 23 64 41 35 17 44 24 64 40 13 17 43 12 64 41 40 17 43 26 64 41 44 17 43 38 64 41 42 17 43 41 64 41 36 17 43 49 64 41 30 17 44 2 64 41 30 17 44 26 64 41 31 17 44 39 64 41 46 17 44 32 64 41 47 17 44 23 64 41 39 17 44 8 64 41 40 17 44 10 64 41 52 17 45 42 64 50 41 780 910 770 165 710 400 770 420 56 345 54 165 370 510 910 95 430 270 300 540 610 600 190 62 40 72 45 76 36 46 46 110 124 560 52 82 168 105 80 235 158 176 155 162 154 92 68 62 92 240 138 76 62 74 360 118 1,200 300 124 114 58 120 110 86 142 190 110 140 100 12 22 52 15 35 30 54 32 20 36 400 26 18 72 58 32 48 32 36 40 48 76 56 <.2 <.2 <.2 .3 <.2 <.2 <.2 <.2 .5 <.2 4.9 .4 <.2 <.2 <.2 .6 <.2 <.2 <.2 <.2 <.2 <.2 .3 1.2 2.2 1.0 :1 .0 d .0 ^1 .0 :1 .0 ^1 .0 :1 .0 :1 .0 :1 .0 3.0 1.0 1.6 1.0 :1.0 1.2 1.3 2.2 1.0 1.0 1.6 :1.0 :1 .0 1.8 1.0 26 30 25 10 47 13 14 16 43 72 900 17 38 28 18 17 31 19 23 20 58 46 24 <20 <20 <20 52 39 <20 <20 <20 59 <20 206 <20 23 <20 <20 <20 <20 <20 31 <20 <20 <20 <20 <5 <5 <5 11 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 17 TABLE 3. DATA RESULTS FOR UATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. THOMAS, U.S. VIRGIN ISLANDS [N, not detected; <, detected but below the limit of determination shown; >, determined to be greater than the value shown.] Sample LAT LONG CA(PPM) MG(PPM) NA(PPM) K(PPM) ZN(PPM) CU(PPM) AG(PPB) CL(PPM) S04(PPM) F(PPM) 3ST001S 3ST002S 3ST003S 3ST004S 3ST007S 3ST008S 3ST009S 3ST010S 3ST011S 3ST012S 3ST013S 3ST014S 3ST015S 3ST017S 3ST018S 3ST019S 3ST021S 3ST022S 3ST023S 3ST024S 3ST025S 3ST027S 3ST030S 3ST031S 3ST044S 3ST045S 3ST046S 3ST049S 3ST052S 3ST062S 3ST063S 3ST067S 3ST068S 3ST069S 3ST070S 3ST071S 3ST072S 3ST073S 3ST074S 3ST075S 3ST076S 3ST077S 3S1078S 3ST079S 3ST081S 18 20 46 18 20 48 18 20 23 18 19 15 18 18 41 18 17 52 18 18 0 18 18 6 18 18 10 18 18 54 18 18 33 18 18 26 18 18 24 18 19 18 18 19 19 18 18 42 18 18 27 18 21 15 18 20 47 18 20 21 18 21 17 18 21 52 18 24 35 18 22 1 18 22 24 18 20 4 18 19 42 18 18 58 18 19 48 18 22 52 18 24 20 18 19 41 18 19 59 18 19 36 18 19 40 18 19 42 18 19 19 18 19 27 18 20 5 18 19 44 18 19 34 18 19 12 18 19 11 18 19 30 18 20 18 64 53 14 64 52 44 64 51 58 64 50 24 64 49 41 64 49 2 64 49 25 64 49 34 64 49 44 64 50 50 64 51 52 64 52 14 64 52 28 64 56 34 64 57 7 64 57 37 65 0 6 64 59 39 64 58 36 64 50 42 64 52 54 64 53 35 64 54 29 64 54 24 64 59 27 64 56 15 64 56 7 64 53 28 64 57 31 65 3 40 65 3 36 64 51 14 64 51 14 64 51 40 64 52 23 64 52 25 64 53 29 64 53 28 64 53 3 64 53 0 64 54 35 64 54 42 64 53 59 64 54 16 64 54 24 38 350 280 385 270 28 48 68 70 290 90 30 830 165 135 105 1,050 540 420 150 125 58 110 150 27 76 34 490 100 120 1,100 130 180 300 300 105 76 380 470 170 425 16 430 60U 810 65 70 140 92 200 46 68 115 105 145 180 64 330 170 140 200 300 150 270 105 105 120 125 86 105 66 175 130 90 120 98 88 175 160 230 72 100 190 125 100 220 44 56 175 235 310 45 58 108 570 550 140 220 520 2,800 1,700 370 265 605 215 240 375 150 1,100 375 420 430 580 340 1,250 195 505 330 215 1,050 220 115 200 68 160 125 135 110 100 170 170 155 74 130 56 34 .2 64 <.2 120 <.2 45 <.2 105 <.2 54 <.2 65 <.2 68 <.2 56 .2 82 <.2 100 .2 58 .2 150 <.2 110 .2 85 <.2 85 .2 185 <.2 60 <.2 345 <.2 96 .2 96 .2 100 5.4 70 .2 9 <.2 46 .6 64 <.2 60 .7 68 <.2 32 <.2 80 <.2 110 .7 85 .2 30 <.2 66 <.2 73 <.2 82 2.0 25 <.2 110 <.2 310 <.2 36 <.2 78 <.2 38 .2 100 <.2 72 <.2 185 <.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 2.0 <1 .0 1 .3 <1.0 1.2 <1.0 1.3 <1.0 1.0 <1.0 <1.0 1.2 7.0 <1.0 <1.0 <1.0 1.0 <1.0 <1.0 <1 .0 1 .0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1 .0 <1 .0 1.0 1.5 15.0 250.0 2.2 3.5 <1.0 <1.0 2.4 7.5 <1.0 1.0 3.0 2.9 <1.0 1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.3 <1.0 <1.0 <1.0 1.4 <1.0 1.6 <1.0 5.0 1.0 1.2 <1.0 <1.0 <1.0 1.4 <1.0 <1.0 <1.0 <1.0 <1.0 1.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 130 34 37 68 500 594 101 164 590 3,000 2,300 248 185 157 125 229 409 63 1,800 98 127 284 113 57 790 339 106 326 250 1,400 420 85 45 51 70 86 45 79 124 55 207 115 73 73 57 118 20 <20 <20 42 86 20 <20 176 1,400 273 39 <20 <20 <20 <20 20 20 300 <20 <20 108 <20 40 203 114 41 20 70 423 354 36 <20 <20 <20 53 20 <20 35 20 <20 39 20 <20 <20 <5 <5 <5 8 <5 <5 5 8 <5 5 7 <5 7 <5 <5 5 20 <5 <5 <5 <5 <5 <5 <5 <5 6 5 <5 <5 <5 <5 7 <5 <5 <5 <5 <5 20 <5 <5 <5 <5 <5 <5 <5 18 TABLE 3. DATA RESULTS FOR UATER-EXTRACTABLE IONS FROM B-HORIZON SOILS, ST. THOMAS, U.S. VIRGIN ISLANDS--Continued Sample LAT LONG CA(PPM) MG(PPM) NA(PPM) K(PPM) ZN(PPM) CU(PPM) AG(PPB) CL(PPM) S04(PPM) F(PPM) 3ST082S 3ST083S 3ST085S 3ST086S 3ST087S 3ST088S 3ST089S 3ST090S 3ST091S 3ST092S 3ST093S 3ST094S 3ST095S 3ST096S 3ST097S 3ST098S 3ST099S 3ST102S 3ST103S 3ST104S 3ST105S 3ST106S 3ST108S 3ST109S 3ST110S 18 20 12 18 20 15 18 21 32 18 21 17 18 21 43 18 22 11 18 22 9 18 21 52 18 21 39 18 21 32 18 21 4 18 20 45 18 21 15 18 21 28 18 20 44 18 20 49 18 20 58 18 18 28 18 18 57 18 21 33 18 21 44 18 21 43 18 21 50 18 21 34 18 20 48 64 54 12 64 53 30 64 54 30 64 55 16 64 56 31 64 57 8 64 57 38 64 58 35 65 0 55 65 1 5 65 1 22 65 1 22 65 0 10 65 1 55 64 56 55 64 57 8 64 57 46 64 50 0 64 49 55 64 50 21 64 49 32 64 49 42 64 52 12 64 51 46 64 51 45 310 550 80 225 790 710 550 600 660 160 100 250 125 710 850 350 150 1,000 495 145 355 225 110 1,100 640 190 200 38 175 290 205 220 270 180 72 55 130 60 220 205 120 38 440 225 28 92 160 120 270 155 135 205 115 200 180 215 230 92 130 115 300 260 385 115 67 72 2,550 120 230 810 470 270 345 1,950 200 25 < 92 < 16 < 49 < 130 < 180 < 39 < 97 < 50 < 47 < 16 < 85 < 18 < 60 < 155 < 68 < 14 < 215 < 105 < 30 < 125 < 88 < 100 < 155 < 96 < d .0 (1 .0 d .0 d .0 d .0 d.O d .0 1.0 1.0 d.O d .0 1.0 d .0 :1 .0 d .0 :1 .0 2.0 :1 .0 :1 .0 :1 .0 :1.0 1.3 2.0 :1 .0 :1 .0 135 127 105 147 194 324 305 99 160 96 141 22 32 51 40 40 1,190 76 190 624 404 69 231 3,600 161 20 <20 33 20 20 33 61 20 <20 20 36 <20 20 <20 <20 20 3,330 <20 <20 235 69 <20 56 716 <20 <5 <5 <5 12 <5 <5 24 <5 <5 5 <5 <5 <5 <5 <5 <5 5 <5 <5 <5 5 <5 <5 <5 <5 3ST111S 18 19 52 64 50 47 15 48 690 42 .5 1.8 10.0 139 123 19