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Text Description: Hornblende andesite. A compact, light pinkish-gray (5R 7/1) rock, with conspicuous crystals of white plagioclase and black hornblende, and a seriate texture. The median composition of the larger plagioclase crystals is about An[?]; the maximum size is about 2 mm. The hornblende forms brilliant narrow prisms, as much as 1.5 mm long, greenish-brown in thin section, and showing marginal resorption to clinopyroxene. The larger salite crystals have nZ 1.715 plus/minus 0.005, or about Ca50Mg35Fe15. The groundmass, with a mean grain size of about 0.002 mm, is apparently an intergrowth of quartz and orthoclase, with prisms up to 0.008 mm long of pyroxene and grains or iron ore about 0.003 mm across. Cristobalite lines vesicles and fills obscure cracks and replaces some of the groundmass. 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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46AC175 | 51.9898 | -176.58705 | Unknown, Unknown | 1946-01-01 | Adagdak | From summit dome of Mt. Adagdak, at a point 800 feet north 78 degrees east of summit. | Hornblende andesite. A compact, light pinkish-gray (5R 7/1) rock, with conspicuous crystals of white plagioclase and black hornblende, and a seriate texture. The median composition of the larger plagioclase crystals is about An[?]; the maximum size is about 2 mm. The hornblende forms brilliant narrow prisms, as much as 1.5 mm long, greenish-brown in thin section, and showing marginal resorption to clinopyroxene. The larger salite crystals have nZ 1.715 plus/minus 0.005, or about Ca50Mg35Fe15. The groundmass, with a mean grain size of about 0.002 mm, is apparently an intergrowth of quartz and orthoclase, with prisms up to 0.008 mm long of pyroxene and grains or iron ore about 0.003 mm across. Cristobalite lines vesicles and fills obscure cracks and replaces some of the groundmass. | 46AC175 | Lava | Whole-rock | 61.34 | 0.38 | 17.32 | 5.98 | 0.16 | 2.16 | 6.72 | 3.87 | 1.53 | 0.32 | 100.56 | 1085 | NN | 3.72 | 2.64 | H2OP=0.19; H2OM=0.04 | NN | units are percent 0.03 | units are percent 0.08 | units are percent 0 | units are percent 0.005 | units are percent 0 | 0.01 | units are percent 0.0004 | 0.001 | units are percent 0.0008 | units are percent 0.001 | units are percent 0.0007 | units are percent 0 | units are percent 0 | 1085 | SPEC |
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