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SAMPLE INFO : 09KCNYE007
Sample ID:09KCNYE007
Station ID:09KCNYE007
Latitude:52.16898
Longitude:-175.52399
Datum:NAD83
Date Sampled:2009-01-01
Text Description:
Hand sample; >20g. At north end of massive pink-weathering lava in north end of a large section of bedded rx (PFs, lahars, etc.) on SW part of island. Px-bearing hb dacite. Hb up to 1.5 cm, mostly ~0.5 cm, prismatic. These massive lavas overlie more bedded coarse material which make up lower half of w-facing cliffs and slopes on cone. Massive lavas (perhaps 2 separate bodies) and therefore maybe domes or vent filling lavas. Pics from land and sea of this unit. [Auklets, constant chatter heard from groups immediately offshore. When standing at "the rock" heard lots of chatter seeming to come from base of these cliffs. Groups of ~1-200 come in and sit on 08 deposits - thick mud/surge on top) for a minute or two, then leave. As I leave this place will look back and see many hundred to few thousand standing here. Jeff Williams will tell me that talus buried here used to be home for nocturnal auklets, not these least and whiskered.] Arroyo adjacent to 007 in valley to N is ~8-12 m deep w/ near vertical walls. Edge-parallel cracks - tension cracks - suggest active process of sloughing into gully. Top 10-50 cm (variable) is ubiquitous mud which forms mudcracks at surface and columns in x-sctn. Below is/are lithic pfs w/ up to 1 cm grains and abt lithics. Scoria mostly light. Below this much coarser w/ angular boulders up to 2 m (photo) suspended in fine matrix. Mottled light pinkish-gray and gray amphibole (amph) plag lava. Amphibole is typically euhedral prisms ~1mm across and 5-10mm long - occasional larger xls. Amph reaction rim obvious on sawn surface w/ hand lens. Plag ~1-2mm. Amph >= plag >> px; total phenocrysts ~30%. Gms has alternating zones that are reddish and gray on scale of several mm. Cleaner sample not available at outcrop.

References:
Geology of Kasatochi volcano, Aleutian Islands, 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
09KCNYE00752.16898-175.52399Nye, C. J.2009-06-13 KasatochiHand sample; >20g. At north end of massive pink-weathering lava in north end of a large section of bedded rx (PFs, lahars, etc.) on SW part of island. Px-bearing hb dacite. Hb up to 1.5 cm, mostly ~0.5 cm, prismatic. These massive lavas overlie more bedded coarse material which make up lower half of w-facing cliffs and slopes on cone. Massive lavas (perhaps 2 separate bodies) and therefore maybe domes or vent filling lavas. Pics from land and sea of this unit. [Auklets, constant chatter heard from groups immediately offshore. When standing at "the rock" heard lots of chatter seeming to come from base of these cliffs. Groups of ~1-200 come in and sit on 08 deposits - thick mud/surge on top) for a minute or two, then leave. As I leave this place will look back and see many hundred to few thousand standing here. Jeff Williams will tell me that talus buried here used to be home for nocturnal auklets, not these least and whiskered.] Arroyo adjacent to 007 in valley to N is ~8-12 m deep w/ near vertical walls. Edge-parallel cracks - tension cracks - suggest active process of sloughing into gully. Top 10-50 cm (variable) is ubiquitous mud which forms mudcracks at surface and columns in x-sctn. Below is/are lithic pfs w/ up to 1 cm grains and abt lithics. Scoria mostly light. Below this much coarser w/ angular boulders up to 2 m (photo) suspended in fine matrix. Mottled light pinkish-gray and gray amphibole (amph) plag lava. Amphibole is typically euhedral prisms ~1mm across and 5-10mm long - occasional larger xls. Amph reaction rim obvious on sawn surface w/ hand lens. Plag ~1-2mm. Amph >= plag >> px; total phenocrysts ~30%. Gms has alternating zones that are reddish and gray on scale of several mm. Cleaner sample not available at outcrop.09KCNYE007Whole-rock 55.57 0.655 18.7 7.69 0.178 3.73 8.75 3.48 1.073 0.168 98.5412761XRF7.69 0.8233 23.4 368.1 418.4 7.883 17.296 2.4424 10.764 2.843 0.9329 3.031 0.5165 3.271 0.7069 2.0121 0.2986 1.9535 0.3208 18.8 85.9 1.6131 2.1876 0.11478 7.802 2.0817 0.9047 21.3 207.9 17.6 15.8 74.1 80.6 18.4 12761ICPMS: Cs, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Nb, Hf, Ta, Pb, Th, U; XRF: Rb, Ba, Sr, Y, Zr, Sc, V, Cr, Ni, Cu, Zn, Ga;

SAMPLE LOCATION

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