Tungsten abundances in some volcanic rocks

Details Tungsten abundances in some volcanic rocks Tungsten abundances in some volcanic rocks

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1067h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 7, pp.1067-1070

Physics

1

Scientific paper

A radiochemical N.A.A. method was used to obtain new values on W distribution in some 125 volcanic rocks, mainly basalts and andesites, from different petrotectonic environments. These W data are below previously reported abundances. New median values in various types of rocks are suggested (ppm W). Basalts: ocean floor, 0.15; ocean islands subalkaline, 0.28; ocean islands alkaline, 0.60; island arc, 0.19: continental margin, 0.40; continental subalkaline, 0.30: continental alkaline, 1.35. Andesites: island arc, 0.23; continental margin, 1.05. Median values for all 91 basalts and all 20 andesites are 0.36 and 0.29 ppm respectively.

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