Computer Science
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.2483c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Dec. 1981, p. 2483-2499.
Computer Science
38
Columbia River Basin (Id-Or-Wa), Earth Crust, Earth Mantle, Volcanology, Basalt, Crystallization, Magma
Scientific paper
It is found that, although crystal fractionation played an important role in producing the chemical characteristics of Columbia River Province basalts displaying a wide range of chemical and isotopic compositions, the isotopic variability calls for the involvement of at least two isotopically distinct components. The major and trace element characteristics of the main volume of the basalts are not consistent with a metasomatized mantle source region, and the presence of a primordial mantel component is not supported by the chemical data. Models of simple binary mixing between a primary magma and Precambrian sialic crustal materials, while satisfying the observed Nd and Sr isotopic variations, fail to account for major trace element abundances. The combination of crustal assimilation and fractional crystalization is found to give a superior fit to the compositional data.
Carlson Richard W.
Lugmair Guenter W.
Macdougall Douglas J.
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