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Data Series 280

U.S. GEOLOGICAL SURVEY
Data Series 280

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Table 3. Description of samples analyzed for strontium isotopic compositions from boreholes at the Nevada Test Site, Nye County, Nevada.

[Stratigraphic units are from lithology logs included in borehole completion reports to U.S. Department of Energy (see U.S. Geological Survey, 2006, for compilation of data and references, as well as Maldonado and others [1979], and Carr and others [1986]). Stratigraphic unit symbols are defined in table 1. Core and cutting samples were obtained in 2006 except for samples from boreholes UE–25 a #3 and UE–25 p #1, which were obtained in the early 1990s. Borehole depths are measured in feet below land surface. Abbreviations: DOE, Department of Energy; m, meter; mm, millimeter; >, greater than; <, less than; ±, plus or minus]

DOE borehole identification No. Top depth (m) Bottom depth (m) Sample identification No. Sample type Stratigraphic unit symbol Description
Army #1 261.8 261.8 Army 1(859) Core Cn-s Mottled medium-to-dark grey, medium-grained limestone. Minor fractures filled with thin white secondary calcite. No alteration apparent.
262.7 262.7 Army 1(862) Core Cn-s Friable, altered limestone consisting of equant, medium-grained, dark grey calcite crystals with intergranular iron-stained (clayey?) material. Also several fragments of other rock or vein material present as rounded clasts.
299.3 302.4 Army 1(982)A Core Cn-h Uniform, coarse-grained, medium-grey dolomite. Minor color mottling between light and medium grey.
299.3 302.4 Army 1(982)B Core Cn-h Thick (>15 mm) vein of sparry white-to-reddish tan calcite cutting grey dolomite. Sample isolates calcite vein from host rock.
388.9 345.0 Army 1(1112) Core Cn-h Highly broken and altered limestone. Original light grey, medium grained carbonate is highly fractured and altered to friable, brown clay-rich material.
594.7 594.7 Army 1(1951) Core fragments Cb Fragments of equigranular, coarse-grained, light-grey limestone with abundant fractures, some of which contain secondary cement and red-brown staining.
ER–3–1 694.9 698.0 ER3–1(2280) Coarse cuttings Cb Medium-to-coarse grained, medium grey limestone.
786.4 789.4 ER3–1(2580) Cuttings Cb Massive fine-grained, light grey limestone.
ER–5–3#2 1,456.9 1,460.0 ER5–3 2(4780) Cuttings Dsv Medium-to-coarse grained, pinkish grey limestone.
ER–6–1#2 661.4 664.5 ER6–1 2(2170) Cuttings Dsv Coarse grained, white-to-light grey dolomite.
801.6 804.7 ER6–1 2(2630) Cuttings Sl Coarse grained, white-to-light grey dolomite.
862.6 865.6 ER6–1 2(2830) Cuttings Sl Coarse grained, white-to-light grey dolomite.
911.3 914.4 ER6–1 2(2990) Cuttings Oes Medium-to-coarse grained, grey dolomite.
ER–6–2 557.8 560.8 ER6–2(1830) Cuttings Cb Medium-grained, grey limestone.
648.9 648.9 ER6–2(2129) Core Cb Uniform medium-grained, brownish grey dolomite with scattered thin fractures containing fine-grained white filling material.
725.1 725.1 ER6–2(2379) Core Cb (mineralized fault) Mottled medium-to-coarse grained, dark grey dolomite. Mottling is caused by irregular patches of coarser, lighter crystals surrounded by finer, darker crystals. Rock is cut by scattered thin, white-calcite-filled veins.
796.4 796.4 ER6–2(2613) Core Dg Medium-grained, medium grey limestone with numerous thin fractures filled with white secondary calcite. No evidence of staining or alteration.
ER–6–2 829.5 829.5 ER6–2(2721.5) Core Dg (mineralized fault) Mottled, fine-grained limestone consisting of light grey carbonate with extensive recrystallization and solution-breccia replacement textures. More-recent fractures commonly have light amounts of red staining.
ER–7–1 655.3 658.4 ER7–1(2150) Coarse cuttings Op Very coarse-grained, medium grey limestone with patches or veins of finer grained carbonate that are either the same color as rock mass or lighter cream to reddish tan to brownish red.
728.5 731.5 ER7–1(2390) Coarse cuttings Op Cuttings of very coarse-grained, medium grey limestone with very uniform consistency. No veins or accessory phases observed, but many of the calcite crystals and fragment surfaces are mildly stained brownish red.
ER–12–1 524.3 527.3 ER12–1(1720) Cuttings Lower Dg or upper Dsi Fine-to-medium grained carbonate including both medium grey and dark grey components. Both graphite and dispersed fine-grained pyrite are common, as are fragment surfaces coated with reddish-brown staining.
1,018.0 1,021.1 ER12–1(3340) Cuttings Upper Dsv Homogeneous sample of coarse-grained, white-to- light grey carbonate. Fragments are clean with no staining or other discoloration on surfaces.
ER–12–3 1,103.4 1,106.4 ER12–3(3620) Cuttings Mid to Late Ordovician Uniform medium-grained, dark-grey dolomite with minor thin, white carbonate veins. Some veins are stained red.
1,368.6 1,371.6 ER12–3(4490) Cuttings Mid Ordovician to Late Cambrian Fine-to-coarse grained, light-to-dark grey limestone with minor color laminae in some fragments. Occassional thin, coarsely crystalline white carbonate veins. Minor iron staining.
1,475.2 1,478.3 ER12–3(4840) Cuttings Mid Ordovician to Late Cambrian Fine-to-coarse grained, medium-grey limestone with laminae in some fragments. Occasional thin white carbonate veins. Pyrite present on one fragment, but no noticable iron staining.
ER–12–4 786.4 789.4 ER12–4(2580) Coarse cuttings DSu Cuttings dominated by medium- to coarse-grained, white-to-light grey dolomite. Small grains of an equant black mineral (oxidized pyrite?) are scattered throughout. Some surfaces have red staining.
1,051.6 1,054.6 ER12–4(3450) Coarse cuttings Mid Ordovician to Late Cambrian Cutting sample includes a range of dolomite fragments. Coarse-grained, white-greenish-grey fragments are dominant, but medium-grained, medium-to-dark grey fragments also are common.
1,094.2 1,097.3 ER12–4(3590) Cuttings Mid Ordovician to Late Cambrian Medium-to-coarse grained, medium-grey dolomite with abundant fine crystals of oxidized pyrite and coarse, white acicular mineral (tremolite?).
ER–16–1 1,079.0 1,082.0 ER16–1(3540) Cuttings Dg Cuttings are dominated by fine-grained, black carbonate with graphite-like sheen on surfaces. Other lithologies are present, but were excluded from sample.
1,158.2 1,161.3 ER16–1(3800) Cuttings Dg Medium-sized cuttings contain a heterogeneous suite of rock types, though most are carbonate. Lithologies range from coarse-grained, marble-like material to fine-grained, dark grey material similar to ER16–1(3540). Bulk material used for powder sample with no further picking.
HTH–3 563.9 566.9 HTH–3(1850) Core fragments Op Fragments of equigranular, coarse-grained, medium-grey dolomite with abundant fractures, some of which contain micro-breccia and fine, white secondary cement ± brown staining.
TW–C 444.4 444.4 TW–C(1458) Core Dg Medium-grained, grey limestone cut by numerous fractures filled with <1- to 5-mm-thick white secondary calcite veins. Minor red staining in some veins.
446.6 446.6 TW–C(1463.5) Core Dg Coarse-grained, mottled grey limestone with extensive secondary veining and recrystallization that yields solution-breccia textures in areas. Secondary calcite is white to brownish red.
TW–D 540.4 541.6 TW–D(1773) Cuttings Cn-d Massive, fine-to-medium-grained, grey limestone. Coarse cuttings have spotty, clay-like coating on fragment surfaces.
UE–1c 545.6 548.6 UE1c(1790) Coarse cuttings Op Coarse-grained, grey limestone. Several chips have fine-grained, brownish material that coat fracture surfaces or form thin veins.
566.9 570.0 UE1c(1860) Coarse cuttings Op Massive, fine-to-medium-grained, light pinkish to greenish brown limestone.
UE–1h 902.2 905.3 UE1h(2960) Cuttings Cn or Cb Coarse grained, white-to-light grey dolomite.
UE–2ce 438.9 442.0 UE2ce(1440) Cuttings Cn or Cb Coarse grained, white-to-light grey dolomite.
UE–7nS 625.5 625.5 UE7nS(2052.2) Core Op-av Mottled limestone consisting of medium-to-coarse grained, light-brown limestone with irregular patches of fine-grained, brownish-red alteration product.
667.5 667.5 UE7nS(2190) Core Op-av Mottled coarse-grained limestone. Patches of coarse, light grey limestone are separated by lenses and veins of finer-grained, iron-stained material.
UE–10j 393.2 394.7 UE10j(1290) Coarse cuttings Cn-s Massive, fine-to-medium-grained grey dolomite. Rock is highly fractured with very thin white, clay-like material commonly present in fractures.
UE–10j 567.8 567.8 UE10j(1863) Core Cn-h Fine-grained, dark-grey dolomite with distinct 1-to-5-mm-thick bedding-plane laminations defined by thin, light brown stylolitic planes and thicker planes of white secondary calcite. Thin veins with white calcite also cut across bedding.
625.1 625.1 UE10j(2051) Core Cn-d Uniform, brownish-red, marly shale with conchoidal fracturing along shaley partings. Fine crystals are apparent under magnification. Some fracture surfaces have additional red staining.
656.5 656.5 UE10j(2154) Core Cb-b Massive coarse-grained, white-to-light grey dolomite. Minor fractures contain light brown staining.
UE–15d 1,816.6 1,817.8 UE15d(5960) Core Zj or Zn Mostly medium-grained, grey dolomite with planar foliation defined by color streaks and grain elongation, but also patches of greenish white, coarse-grained dolomite breccia. Accessory pyrite present in both phases.
1,827.0 1,827.0 UE15d(5994) Core Zj or Zn Fine-grained, medium-grey dolomite with light-colored spots of coarser carbonate. Scattered fractures are filled with white secondary carbonate.
UE–16d 311.0 313.9 UE16d(1020) Cuttings PPt Massive, fine-to-medium-grained, grey limestone.
472.4 475.5 UE16d(1550) Cuttings MDe Very coarse, white-to-light grey limestone concentrated from heterogeneous lithologies (including volcanic and fine-grained carbonates) in cuttings sample by extensive hand picking.
UE–25 a #3 43.3 43.4 UE25a3–142 Core Mc or MDg Dark grey, very-fine-grained shale/argillite.
98.9 99.0 UE25a3–324 Core Mc or MDg Dark grey, very-fine-grained shale/argillite.
150.4 150.5 UE25a3–493 Core Mc or MDg Dark grey, very-fine-grained shale/argillite.
208.4 208.5 UE25a3–684 Core Mc or MDg Dark grey, very-fine-grained shale/argillite.
263.0 263.1 UE25a3–863 Core Mc or MDg Dark grey, very-fine-grained shale/argillite.
325.7 325.9 UE25a3–1069 Core Mc or MDg Dark grey, very-fine-grained shale/argillite.
435.9 436.0 UE25a3–1430 Core Mc or MDg Light tannish-grey, thermally altered shale/argillite.
525.0 525.1 UE25a3–1722 Core Mc or MDg Light grey, thermally altered shale/argillite.
562.5 562.6 UE25a3–1846 Core Mc or MDg Light grey, thermally altered shale/argillite.
637.8 637.9 UE25a3–2093 Core Mc or MDg Light grey, coarse-grained metasandstone.
697.2 697.3 UE25a3–2287 Core Mc or MDg Light greenish-grey, calcareous argillite.
741.1 741.2 UE25a3–2432 Core Du Dark orange-yellow, ferruginous clay seam.
759.6 759.7 UE25a3–2492 Core Du White calcitic marble.
766.4 766.5 UE25a3–2514 Core Du Light grey, laminated marble.
UE–25 p #1 1,277.9 1,278.0 HD–622 Core DSlm Light grey, massive, pelloidal dolomite.
1,284.1 1,284.2 HD–621 Core DSlm Light grey, fine-grained, massive dolomite.
1,798.3 1,798.4 UE25p 1–5900 Core Sr Dark grey, fine-grained dolomite with thin lamellae.

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