Data Series 280
U.S. GEOLOGICAL SURVEY
Data Series 280
Table 7. Selected trace element concentrations and strontium isotopic compositions (87Sr/86Sr) in core samples from boreholes UE‑25 a #3 and UE-25 p #1, Nevada Test Site, Nye County, Nevada.
[Siliciclastic lithologies for samples from surface to 697.2-m depth in borehole UE–25 a #3 consist of Mississippian (middle Chester to early Osage stages) Chainman Shale and Gap Wash Formation (Maldonado and others, 1979; Cole and Cashman, 1998). Underlying core is undifferentiated Devonian carbonate (Du). Stratigraphic units for borehole UE–25 p #1 are from Carr and others (1986). Stratigraphic unit symbols are defined in table 1. Analysis type: WR indicates that strontium isotopic compositions (87Sr/86Sr) were determined on whole-rock digestions using concentrated hydrofluoric, nitric, hydrochloric, and sulfuric acids; HCl–L indicates that 87Sr/86Sr values were determined on dilute hydrochloric acid leachates of powdered rock samples. Strontium isotopic compositions are given in delta notation (δ87Sr = [(87Sr/86Srsample/87Sr/86Srmsw)-1]×1,000 and δ87Srt = [(87Sr/86Srsample/87Sr/86Srpsw)-1]×1,000, where 87Sr/86Srmsw is the value for modern seawater and 87Sr/86Srpsw is the value for paleoseawater at the time of deposition). Abbreviations and symbols: Rb, rubidium; Sr, strontium; Y, yittrium; Zr, zirconium; Nb, Niobium; Ba, barium; La, lanthanum; Ce, cerium; m, meter; ‰, per mil; ND, not determined]
| Sample identification No. | Borehole | Borehole depth (m) | Strati-graphic unit | Rb | Sr | Y | Zr | Nb | Ba | La | Ce | Analysis type | 87Sr/86Sr (±0.00005 2σ) | δ87Sr, ‰ (±0.07 2σ) | δ87Srt, ‰ | Seawater 87Sr/86Srpsw used |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UE25a3–142 | UE–25 a #3 | 43.3 | Mc/MDg | 48 | 89 | 45 | 320 | 16 | 115 | ND | ND | WR | 0.71554 | 8.94 | 10.4 | 0.7082 |
| UE25a3–324 | UE–25 a #3 | 98.8 | Mc/MDg | 90 | 176 | 41 | 173 | 20 | 182 | ND | ND | WR | .71616 | 9.81 | 11.4 | .7081 |
| UE25a3–493 | UE–25 a #3 | 150.4 | Mc/MDg | 54 | 91 | 42 | 282 | 20 | ND | ND | WR | .71795 | 12.34 | 14.0 | .7080 | |
| UE25a3–684 | UE–25 a #3 | 208.4 | Mc/MDg | 84 | 177 | 44 | 212 | 21 | 210 | ND | ND | WR | .71539 | 8.73 | 10.5 | .7079 |
| UE25a3–863 | UE–25 a #3 | 263.1 | Mc/MDg | 77 | 159 | 49 | 273 | 19 | 189 | ND | ND | WR | .71523 | 8.50 | 10.5 | .7078 |
| UE25a3–1069 | UE–25 a #3 | 325.7 | Mc/MDg | 80 | 205 | 43 | 189 | 20 | 240 | ND | ND | WR | .71494 | 8.09 | 10.2 | .7077 |
| UE25a3–1430 | UE–25 a #3 | 435.9 | Mc/MDg | 78 | 74 | 27 | 117 | 9 | 1,247 | ND | ND | WR | .71633 | 10.05 | 12.2 | .7077 |
| UE25a3–1722 | UE–25 a #3 | 525.0 | Mc/MDg | 146 | 65 | 32 | 151 | 14 | 1,575 | ND | ND | WR | .72022 | 15.54 | 17.4 | .7079 |
| UE25a3–1846 | UE–25 a #3 | 562.5 | Mc/MDg | 61 | 86 | 26 | 137 | 15 | 889 | ND | ND | WR | .72087 | 16.46 | 18.3 | .7080 |
| UE25a3–2093 | UE–25 a #3 | 637.9 | Mc/MDg | 39 | 51 | 15 | 96 | 6 | 394 | ND | ND | WR | .72369 | 20.43 | 22.1 | .7081 |
| UE25a3–2287 | UE–25 a #3 | 697.2 | Mc/MDg | 71 | 131 | 31 | 176 | 7 | 299 | ND | ND | WR | .71700 | 11.00 | 12.5 | .7082 |
| UE25a3–2432 | UE–25 a #3 | 741.1 | Du | 2 | 87 | 33 | 6 | 2 | ND | ND | WR | .71323 | 5.68 | 7.10 | .7082 | |
| UE25a3–2492 | UE–25 a #3 | 759.6 | Du | 0 | 60 | 5 | 3 | 0 | 73 | 21 | 3 | HCl-L | .71111 | 2.69 | 4.04 | .7083 |
| UE25a3–2514 | UE–25 a #3 | 766.4 | Du | 0 | 36 | 5 | 2 | 0 | 38 | 24 | 6 | HCl-L | .71080 | 2.26 | 3.60 | .7083 |
| HD–622 | UE–25 p #1 | 1,277.7 | DSlm | 0 | 68 | 0 | 14 | 0 | 10 | 5 | 11 | HCl-L | .70907 | - .19 | .38 | .7088 |
| HD–621 | UE–25 p #1 | 1,284.1 | DSlm | 0 | 62 | 0 | 11 | 0 | 0 | 9 | 0 | HCl-L | .70905 | - .21 | .35 | .7088 |
| UE25p 1–5900 | UE–25 p #1 | 1,798.3 | Sr | 3 | 70 | 5 | 15 | 0 | 0 | 23 | 14 | HCl-L | .70835 | -1.20 | - .07 | .7084 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/ds/2007/280/
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