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Text Description: Dacitic andesite and dacite flows. Thick sequence of thin to medium flows with minor interbedded tuffs and breccias representing main cone-building state of Jarvis volcanoes which extend into the McCarthy D-7 and Nabesna A-6 quadrangles. Rocks are gray, dark gray, and pinkish gray. Chiefly two-pyroxene andesite containing hypersthene, augite, plagioclase, and rare olivine phenocrysts in a felty plagioclase-rich matrix. In southwest corner of quadrangle sequence is cut by numerous dark-colored dikes probably chiefly of andesite composition. K-Ar date (M.A. Lanphere, written commun., 1974) on plagioclase indicates age of 1.63 +/- 0.42 m.y. (Sample 72-ARh-307a). 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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72-ARh-307 | 62.0114 | -143.28308 | Richter, D. H. | 1972-00-00 | 1630000 ± 420000 K-Ar; 4537; plagioclase K-Ar | Jarvis | Nabesna A-5 quadrangle; Wrangell Lava; Wrangell Volcanic Field. lat long points derived from paper map. Sample from Jarvis. | Dacitic andesite and dacite flows. Thick sequence of thin to medium flows with minor interbedded tuffs and breccias representing main cone-building state of Jarvis volcanoes which extend into the McCarthy D-7 and Nabesna A-6 quadrangles. Rocks are gray, dark gray, and pinkish gray. Chiefly two-pyroxene andesite containing hypersthene, augite, plagioclase, and rare olivine phenocrysts in a felty plagioclase-rich matrix. In southwest corner of quadrangle sequence is cut by numerous dark-colored dikes probably chiefly of andesite composition. K-Ar date (M.A. Lanphere, written commun., 1974) on plagioclase indicates age of 1.63 +/- 0.42 m.y. (Sample 72-ARh-307a). | 72-ARh-307 | Lava | Whole-rock | 61.9 | 1.1 | 16.6 | 5.3 | 0.09 | 2.5 | 4.8 | 4.4 | 2.2 | 0.28 | 99.98 | 4537 | RAPIDA | 2.3 | 3.2 | H2O=0.71 | RAPIDA |
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