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SAMPLE INFO : SWPB1
Sample ID:SWPB1
Station ID:SWPB1
Latitude:57.18
Longitude:-170.3
Datum:NAD83
Sample Type 1:Lava
Sample Type 2:Flow
Text Description:
From Feeley and Winer (1999): "Samples prefixed SWP- were collected from lava flows that are well exposed in coastal cliffs at Southwest Point. Here at least two lava flows are present. The lower flow (SWPB1) is ~2.4 m thick and has poorly developed columnar jointing. This flow is covered by a thin layer (~0.5 m) of sediments, suggesting a significant hiatus prior to eruption of the overlying units. Samples SWPT1, -2, and -3 are from thin (<1m) poorly vesiculated lava horizons separated by autoclastic breccia zones. Although these units are petrographically distinct in hand specimen and thin section, geochemically they are very similar, suggesting that they represent either eruption of three compositionally similar flows or different lobes of a single compound flow."

References:
Evidence for fractionation of Quaternary basalts on St. Paul Island, Alaska, with implications for the development of shallow magma chambers beneath Bering Sea volcanoes

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-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
SWPB157.18-170.3Winer, G. S. St. Paul IslandSouthwest Point, St. Paul IslandFrom Feeley and Winer (1999): "Samples prefixed SWP- were collected from lava flows that are well exposed in coastal cliffs at Southwest Point. Here at least two lava flows are present. The lower flow (SWPB1) is ~2.4 m thick and has poorly developed columnar jointing. This flow is covered by a thin layer (~0.5 m) of sediments, suggesting a significant hiatus prior to eruption of the overlying units. Samples SWPT1, -2, and -3 are from thin (<1m) poorly vesiculated lava horizons separated by autoclastic breccia zones. Although these units are petrographically distinct in hand specimen and thin section, geochemically they are very similar, suggesting that they represent either eruption of three compositionally similar flows or different lobes of a single compound flow."SWPB1Whole Rock 45.04 2.42 13.43 11.11 0.17 12.14 10.01 3.69 1.47 0.53 99.69115XRF12.1611.11 25.3 42.3 23 5.29 1.82 0.71 1.36 0.21 3.83 2.5 23.6 64.3 115INAA 16 272 675 19 181 44.2 2 7 263 521 270 49 82 16115XRF

SAMPLE LOCATION

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Page modified: July 14, 2014 13:37
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