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Text Description: Outcrop of black vitrophyre, ~4-5’ below the epiclastic unit at Site 1 in the Boyden Hills. Sample is from float below the outcrop. Fine grained, hypocrystalline, pilotaxitic, porphyritic to glomeroporphyritic with a matrix of glass, plagioclase, opaque, apatite, zircon, and microlites. Plagioclase phenocrysts (An32 - An35) are up to 3.12 mm and larger grains occasionally have normal zoning. Opaque phenocrysts are up to 0.6 mm,, but most are matrix size. Orthopyroxene phenocrysts are up to 1.1 mm with intense pleochroism and occasionally have opaque inclusions. Biotite? or amphibole? phenocrysts are up to 0.08 mm. 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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93SJP45 | 62.47851817 | -143.0701957 | Preece, S. J. | 1993-00-00 | Skookum Creek | Nabesna B-5; T8N, R13E, S18 | Outcrop of black vitrophyre, ~4-5’ below the epiclastic unit at Site 1 in the Boyden Hills. Sample is from float below the outcrop. Fine grained, hypocrystalline, pilotaxitic, porphyritic to glomeroporphyritic with a matrix of glass, plagioclase, opaque, apatite, zircon, and microlites. Plagioclase phenocrysts (An32 - An35) are up to 3.12 mm and larger grains occasionally have normal zoning. Opaque phenocrysts are up to 0.6 mm,, but most are matrix size. Orthopyroxene phenocrysts are up to 1.1 mm with intense pleochroism and occasionally have opaque inclusions. Biotite? or amphibole? phenocrysts are up to 0.08 mm. | 93SJP45 | Lava | Whole-rock | 72.91 | 0.11 | 13.81 | 1.35 | 0.07 | 0.15 | 0.97 | 4.73 | 3.18 | bdl 0 | 99.64 | 55 | DCP | 1.49 | 1.35 | LOI=2.72 | DCP | 53 | 833 | 127 | 16 | 142 | 8.6 | 4.7 | 2.9 | 1.7 | 1 | bdl | bdl | 2 | 45 | 15.1 | 55 | XRF: Rb, Zr, Nb, Th, U, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cu, Zn; |
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