UA1678 was the most abundant in shards (of all tephra samples from Column Point) and had a range of morphologies, including chunky pumice and tricuspate and needle-like glasses. Plagioclase dominated, with some orthopyroxene.
Extending the Applications of Tephrochronology in Northwestern North America
|StationID||Latitude||Longitude||Geologist||DateVisited||Age Info||Volcano||Eruption||Location Description||Text Description||Sample ID||Sample Type 1||Sample Type 2||Final Unit||Material||Coeff||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|
|Column_Point||57.9||-136.29998||Unknown, Unknown||A 40-cm-long monolith collected from a nearly flat expanse of peat near the level of mean low water on an exposed beach facing the open Gulf of alaska at Column Point, Chichagof Island. The monolith, approximately 400X150X150 mm, is bounded at the top by a thick tephra bed and at the base by a thin gravel layer. Five macro tephra layers were identified by visual inspection of lighter-coloured beds and number UA1674-1678 from base to top. Coordinates not provided, generic location selected on Chichagof Island, Alaska.||UA1678 was the most abundant in shards (of all tephra samples from Column Point) and had a range of morphologies, including chunky pumice and tricuspate and needle-like glasses. Plagioclase dominated, with some orthopyroxene.||UA1678(I)||Tephra Fall||Cumulate||Glass||69.8||0.46||15.64||3.58||0.07||0.69||2.76||4.96||1.93||11151||EMP||3.58||Cl=0.1; H2O=1.9||EMP|
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