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Text Description: Gray outcrop sticking up through the talus of Dome A at Site 2. There is obvious magma mixing with very large amphibole crystals and white blobs of material with black glassy rims. Fine grained, holocrystalline, trachytic, porphyritic to seriate porphyritic with a matrix of mesostasis, plagioclase, opaque and alteration. Plagioclase phenocrysts (An 31-An63) are up to 2.5 mm, commonly display sieve textured zones, resorbed edges or less commonly resorption embayments, overgrowth rims, and complex zoning. Orthopyroxene phenocrysts are up to 2.25 mm. Clinopyroxene phenocrysts are up to 0.45 mm. Amphibole phenocrysts are up to 0.5 mm and have thick brownish rims that are replacing the crystal. Mode: 83.0% matrix, 13.5% plagioclase, 0.4% clinopyroxene, 1.7% orthopyroxene, 1.1% alteration, 0.3% vesicles. References: ![]() |
StationID | Latitude | Longitude | Geologist | DateVisited | Age Info | Volcano | Eruption | Location Description | Text Description | Sample ID | Sample Type 1 | Sample Type 2 | Final Unit | Material | SiO2 | TiO2 | Al2O3 | FeOT | MnO | MgO | CaO | Na2O | K2O | P2O5 | Total-majors | REF majors | METH majors | Fe2O3/Fe203T orig | FeO/FeOT orig | Volatiles csv | METH volatiles | Cs | Rb | Ba | Sr | La | Ce | Pr | Nd | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | Y | Zr | Nb | Hf | Ta | Pb | Th | U | Sc | V | Cr | Fe | Co | Ni | Cu | Zn | Ga | Mo | As | Na | K | Ref trace1 | METH trace1 | Rb | Ba | Sr | La | Ce | Nd | Sm | Eu | Gd | Dy | Er | Yb | Lu | Y | Zr | Nb | Pb | Th | U | Sc | Ti | V | Cr | Ni | Cu | Zn | Ga | Ref trace2 | METH trace2 | Light csv | Halogen csv | other major csv | other lile csv | other ree csv | other hfse csv | other hpe csv | other tm csv | other misc csv | |
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93SJP26 | 62.435 | -143.1099141 | Preece, S. J. | 1993-00-00 | Skookum Creek | Nabesna B-5, T8N, R12E, S36 | Gray outcrop sticking up through the talus of Dome A at Site 2. There is obvious magma mixing with very large amphibole crystals and white blobs of material with black glassy rims. Fine grained, holocrystalline, trachytic, porphyritic to seriate porphyritic with a matrix of mesostasis, plagioclase, opaque and alteration. Plagioclase phenocrysts (An 31-An63) are up to 2.5 mm, commonly display sieve textured zones, resorbed edges or less commonly resorption embayments, overgrowth rims, and complex zoning. Orthopyroxene phenocrysts are up to 2.25 mm. Clinopyroxene phenocrysts are up to 0.45 mm. Amphibole phenocrysts are up to 0.5 mm and have thick brownish rims that are replacing the crystal. Mode: 83.0% matrix, 13.5% plagioclase, 0.4% clinopyroxene, 1.7% orthopyroxene, 1.1% alteration, 0.3% vesicles. | 93SJP26 | Lava | Whole-rock | 57.2 | 0.92 | 19.1 | 5.95 | 0.13 | 3.31 | 7.5 | 4.33 | 1 | 0.2 | 99.18 | 55 | DCP | 6.51 | 5.95 | LOI=0.29 | DCP | 16.3 | 399 | 609 | 17 | 104 | 4.2 | 2.1 | 1.8 | 17.6 | 145 | 25 | 33 | 50 | 71 | 17.8 | 55 | XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn; |
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