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Text Description: A vertical dike trending S65°E that intruded into the brecciated unit (sBA9) at Site 12. There is a 10 cm chill margin that is very glassy. Fine grained, vesicular, hypocrystalline, seriate porphyritic with a matrix of plagioclase, opaque, pale brown glass, microlites and orthopyroxene?. Plagioclase phenocrysts (An39 - An52) are up to 1.7 mm and both normal and oscillatory zoning are common; the largest grains often have thin overgrowth rims. Amphibole phenocrysts are up to 0.8 mm, and dehydrated to granular opaque masses with green-brown pleochroic cores; most grains are entirely replaced. Orthopyroxene phenocrysts are up to 0.25 mm. Opaque phenocrysts are up to 0.5 mm (primary not pseudomorphs after amphibole). 83.7% matrix, 10.1% plagioclase, 0.3% opaque, 0.1% altered phase, 0.1% alteration, 5.7% vesicles. Trachydacite. 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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94SJP11A | 62.28850246 | -143.267 | Preece, S. J. | 1994-00-00 | Skookum Creek | Nabesna B-5; T6N, R12E, S19 | A vertical dike trending S65°E that intruded into the brecciated unit (sBA9) at Site 12. There is a 10 cm chill margin that is very glassy. Fine grained, vesicular, hypocrystalline, seriate porphyritic with a matrix of plagioclase, opaque, pale brown glass, microlites and orthopyroxene?. Plagioclase phenocrysts (An39 - An52) are up to 1.7 mm and both normal and oscillatory zoning are common; the largest grains often have thin overgrowth rims. Amphibole phenocrysts are up to 0.8 mm, and dehydrated to granular opaque masses with green-brown pleochroic cores; most grains are entirely replaced. Orthopyroxene phenocrysts are up to 0.25 mm. Opaque phenocrysts are up to 0.5 mm (primary not pseudomorphs after amphibole). 83.7% matrix, 10.1% plagioclase, 0.3% opaque, 0.1% altered phase, 0.1% alteration, 5.7% vesicles. Trachydacite. | 94SJP11A | Lava | Whole-rock | 64.94 | 0.62 | 16.89 | 4.17 | 0.21 | 1.08 | 2.96 | 6.01 | 1.86 | 0.31 | 99.27 | 55 | DCP | 4.58 | 4.17 | LOI=0.93 | DCP | 19.8 | 594 | 433 | 46 | 458 | 17.8 | 5.6 | 0.8 | 6 | 2 | bdl | 2 | 3 | 103 | 19.5 | 55 | XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cu, Zn; |
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