Other
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..72...65p&link_type=abstract
Earth and Planetary Science Letters, Volume 72, Issue 1, p. 65-73.
Other
8
Scientific paper
Data on major and a few trace element contents for specimens of five formational-scale units of the Columbia River Basalt Group are reviewed and compared with those for other flood basalts and the Chyulu basalts of Kenya. Flows of the Grande Ronde Formation, which constitutes more than two-thirds by volume of the Columbia River Basalt Group, in several respects resemble calc-alkaline rocks, and they plot in the field for magmas erupted at destructive plate margins on a Th-Hf-Ta diagram. These features of Grande Ronde flows may be related to the anomalous setting of the Columbia River Basalt Group as a whole. Calc-alkaline characteristics are exhibited by other flood basalts but rarely to the degree shown by Grande Ronde flows. Few if any of the Columbia River basalts represent primary magmas. Rather, they generally have been affected by multi-stage fractionation, and perhaps also by interaction with lower crustal rocks. Their compositions also may reflect partial melting of fragments of subducted lithospheric slabs.
Goles Gordon G.
Prestvik Tore
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