Continental Flood Basalts by P. R. Hooper (auth.), J. D. Macdougall (eds.) PDF

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1984; Hart, 1985). Similar compatible element rich basalts are found on the Snake River Plain (Leeman, 1982b), though the majority of Snake River Plain basalts tend towards more Fe rich compositions (Snake River Plain olivine tholeiites, SROT). 38 R. W. CARLSON AND W. K. S. flood basalts show wide variation in major element composition. The most successful discriminants between the various groups are based on contents of Ti02 and P20 S (Hooper, 1982), though even here, overlapping characteristics are common.

Amer. Bull. 85, 15-26. R. (1981). R. HOOPER evolution and petrogenesis of the Columbia River Basalt. Memoirs Geol. Soc. India 3, 362-376. R. (1982). The Columbia River Basalts. Science 215, 1463-1468. R. (1984a). Physical and chemical constraints on the evolution of the Columbia River Basalts. Geology 12,495-499. R. (1984b). Tectonic model for the Columbia River Basalt west of Riggins, Idaho. M. ), Cenozoic Geology ofIdaho. Idaho Bur. Mines Geol. Bull. 26, 124-136. R. E. Camp (1981). Deformation of the southeast part of the Columbia Plateau.

F. 045 The imperfect inverse correlation between enrichment factor and bulk distribution coefficient is tsken as evidence for an RFC (recharge + crystal fractionation) model. Lack of obvious decoupling between the LlL and HFS elements is used as evidence against significant crustal contamination during the fractionation process (AFC). Lack of significant variation in the Sr and Nd isotope ratios and lack of a clear correlation between LIL/HFS rations with degree of crystal fractionation both suggest that crustal assimilation did not accompany crystal fractionation in the magma reservoir.

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