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Text Description: QTd - Extrusive rocks (Pleistocene and Pliocene). Domes or massive flows generally associated with small subaqueous cinder cones (QTc). Rocks exhibit spectacular columnar joints. They are greenish black to medium gray, porphyritic basalts (50.3-51.6% SiO2) containing phenocrysts of plagioclase (5-15%, 3-4 mm), clinopyroxene (1-10% 2-3 mm), and olivine (trace-3%, 1-2 mm) in a pilotaxitic groundmass. Whole rock 40Ar/39Ar mean age of the basalt is 1.55+/-0.04 Ma. 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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96-Mc-5 | 54.1695 | -165.78558 | McGimsey, R. G. | 1996-00-00 | Akutan | lat/long estimated from paper map | QTd - Extrusive rocks (Pleistocene and Pliocene). Domes or massive flows generally associated with small subaqueous cinder cones (QTc). Rocks exhibit spectacular columnar joints. They are greenish black to medium gray, porphyritic basalts (50.3-51.6% SiO2) containing phenocrysts of plagioclase (5-15%, 3-4 mm), clinopyroxene (1-10% 2-3 mm), and olivine (trace-3%, 1-2 mm) in a pilotaxitic groundmass. Whole rock 40Ar/39Ar mean age of the basalt is 1.55+/-0.04 Ma. | 96-Mc-5 | Lava | aau | Whole-rock | 50.28 | 0.94 | 18.47 | 8.95 | 0.164 | 5.75 | 11.58 | 2.82 | 0.89 | 0.161 | 924 | XRF | 8.95 | 0.645334312 | 17.71626785 | 266.7009493 | 452.1025164 | 7.733646315 | 17.92113784 | 2.631197694 | 12.08861039 | 3.424562206 | 1.054850033 | 3.698089562 | 0.6337349 | 4.023622232 | 0.859330867 | 2.358716845 | 0.333335363 | 2.121684921 | 0.331727364 | 21.18619949 | 81.12581128 | 1.779440965 | 2.494509453 | 0.134672898 | 5.888379267 | 2.351816816 | 1.135901091 | 34.06770405 | 272 | 72 | 23 | 125 | 69 | 18 | 924 | ICPMS: 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; XRF: V, Cr, Ni, Cu, Zn, Ga; |
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