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Text Description: Sample of the dome on the flank of East Cape Volcano. This sample is hypersthene-bearing hornblende basalt, pale gray, porous in structure, with a faint lineation due to the orientation of the hornblende prisms. About 4/5 of the coarser part of the rock consists of plagioclase grains from 0.02 to 0.6 mm in size, with an average composition of An55. Hornblende, about 10% by volume, is greenish brown, and the needles are from 0.02 to 2 mm long. The hypersthene prisms, which form about 3 % of the rock, are from 0.02 to 0.4 mm in length. Magnetite grains make up about 2% and augite about 1% of the rock. Traces of apatite, olivine (Fa18), and glass (n=1.515) are present. A small amount of analcime(?) appears to replace both glass and plagioclase. The groundmass, which forms about 20% of the whole rock, consists of unoriented augite needles, averaging about 0.0002 by 0.02 mm in size, plagioclase crystals, 0.01 by 0.02 mm, and magnetite granules, in glass. 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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47AC30 | 52.36142 | 175.93775 | Unknown, Unknown | 1947-01-01 | East Cape | Dome on flank of East Cape Volcano | Sample of the dome on the flank of East Cape Volcano. This sample is hypersthene-bearing hornblende basalt, pale gray, porous in structure, with a faint lineation due to the orientation of the hornblende prisms. About 4/5 of the coarser part of the rock consists of plagioclase grains from 0.02 to 0.6 mm in size, with an average composition of An55. Hornblende, about 10% by volume, is greenish brown, and the needles are from 0.02 to 2 mm long. The hypersthene prisms, which form about 3 % of the rock, are from 0.02 to 0.4 mm in length. Magnetite grains make up about 2% and augite about 1% of the rock. Traces of apatite, olivine (Fa18), and glass (n=1.515) are present. A small amount of analcime(?) appears to replace both glass and plagioclase. The groundmass, which forms about 20% of the whole rock, consists of unoriented augite needles, averaging about 0.0002 by 0.02 mm in size, plagioclase crystals, 0.01 by 0.02 mm, and magnetite granules, in glass. | 47AC30 | Lava | Whole-rock | 61 | 0.68 | 16.74 | 5.26 | 0.13 | 3.51 | 6.91 | 0.29 | Total calculated from mixed methods 99.86 | 272 | NN | 2.96 | 2.58 | Cl=0.1; F=0.02; H2OM=0.1; H2OP=0.44 | NN | units are percent 0.03 | units are percent 0.06 | n.d. 0 | units are percent 0.006 | n.d. 0 | 0.006 | units are percent 0.004 | 0.001 | units are percent 0.002 | units are percent 0.003 | n.d. 0 | units are percent 0.001 | n.d. 0 | n.d. 0 | 272 | SPEC | Na2O V=3.71, M=FPHOT, R=272;K2O V=1.1, M=FPHOT, R=272; |
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