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SAMPLE INFO : specimen 4
Sample ID:specimen 4
Station ID:specimen 4
Latitude:51.6417
Longitude:-176.8203
Datum:NAD83
Date Sampled:1952-01-01
Sample Type 1:Lava
Sample Type 2:Sill
Text Description:
Analyzed specimen no. 4 is coarse-grained gabbro from a sill (?) 500 yards south of the head of Chapel Cove, Bay of Waterfalls. It is a bytownite-labradorite olivine gabbro with abundant magnetite. Small chips of the rock can be picked up with a pocket magnet. Dark minerals occur in single crystals or as clusters as great as 1 cm in diameter, but usually less than 5 mm. These dark constituents are set in a finer (less than 3 mm) matrix of feldspar laths. Feldspars are subhedral and the clinopyroxene generally anhedral. An estimated mode gives the following volume percents : zoned bytownite-labradorite, 65 percent; clinopyroxene, 15 percent; magnetite, 7 percent; olivine pseudomorphs (antigorite?), 8 percent; interstitial and pseudomorphic penninite and carbonate, 5 percent.

References:
Geology of southern Adak Island and Kagalaska Island, Alaska

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final UnitMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-majorsREF majorsMETH majorsFe2O3/Fe203T origFeO/FeOT origVolatiles csvMETH volatilesCsRbBaSrLaCePrNdSmEuGdTbDyHoErTmYbLuYZrNbHfTaPbThUScVCrFeCoNiCuZnGaMoAsNaKRef trace1METH trace1RbBaSrLaCeNdSmEuGdDyErYbLuYZrNbPbThUScTiVCrNiCuZnGaRef trace2METH trace2Light csvHalogen csvother major csvother lile csvother ree csvother hfse csvother hpe csvother tm csvother misc csv
specimen 451.6417-176.8203Unknown, Unknown1952-01-01 500 yards south of the head of Chapel Cove (Bay of Waterfalls), southwest Adak IslandAnalyzed specimen no. 4 is coarse-grained gabbro from a sill (?) 500 yards south of the head of Chapel Cove, Bay of Waterfalls. It is a bytownite-labradorite olivine gabbro with abundant magnetite. Small chips of the rock can be picked up with a pocket magnet. Dark minerals occur in single crystals or as clusters as great as 1 cm in diameter, but usually less than 5 mm. These dark constituents are set in a finer (less than 3 mm) matrix of feldspar laths. Feldspars are subhedral and the clinopyroxene generally anhedral. An estimated mode gives the following volume percents : zoned bytownite-labradorite, 65 percent; clinopyroxene, 15 percent; magnetite, 7 percent; olivine pseudomorphs (antigorite?), 8 percent; interstitial and pseudomorphic penninite and carbonate, 5 percent.specimen 4LavaWhole-rock 45.98 0.74 18.89 10.3 0.14 6.78 13.01 2.03 0.11 0.05 99.92356NN5.645.13H2OM=0.22; H2OP=1.37; CO2=0.35; Cl=0.01; F=0.02NN 810 45.3 units are percent 0.09745XRF: Sr, Ni; NN: K;
specimen 451.6417-176.8203Unknown, Unknown1952-01-01 500 yards south of the head of Chapel Cove (Bay of Waterfalls), southwest Adak IslandAnalyzed specimen no. 4 is coarse-grained gabbro from a sill (?) 500 yards south of the head of Chapel Cove, Bay of Waterfalls. It is a bytownite-labradorite olivine gabbro with abundant magnetite. Small chips of the rock can be picked up with a pocket magnet. Dark minerals occur in single crystals or as clusters as great as 1 cm in diameter, but usually less than 5 mm. These dark constituents are set in a finer (less than 3 mm) matrix of feldspar laths. Feldspars are subhedral and the clinopyroxene generally anhedral. An estimated mode gives the following volume percents : zoned bytownite-labradorite, 65 percent; clinopyroxene, 15 percent; magnetite, 7 percent; olivine pseudomorphs (antigorite?), 8 percent; interstitial and pseudomorphic penninite and carbonate, 5 percent.specimen 4LavaWhole-rock H2OM=0.22; H2OP=1.37; CO2=0.35; Cl=0.01; F=0.02NN 356

SAMPLE LOCATION

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