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- W75801128 abstract "Detailed Pb isotope studies, together with the data of Carlson (GSA 1984) and Church (BGSA 1985) show that the 206/204 207/204 plot of CRB (pre-Saddle Mountain units) resembles the geological map of CRB. The Blue Mountain uplift clearly subdivides CRB isotopically: 206/204 > 18.90 to the east and lower to the west with the exception of Picture Gorge flows and a few others. The western area includes the Grande Ronde (Yakima) type flows, which occur north and west of Yakima, as far as the coast (including BCR-1). They have low 206/204, low positive or negative element of Nd, /sup 87/Sr//sup 86/Sr greater than or equal to 0.7049, SiO/sub 2/ > 55% (anhydrous basis) and are chemically and petrographically ferro-andesites. Geochemically they have higher Fe/Mg, K, Rb, Cs, Ba, Th, U and LREE than the average GR elsewhere. These, together with some other GR, PG and all western Wanapum flows have Pb isotopes which lie on a mixing line of negative slope, roughly corresponding to the line joining Carlson's reservoirs Cl and C3. The authors consider that the reservoir C3 is a pyroxenic and enriched mantle component, possible of deep origin, which has mixed during melting with Cl to form themore » western CRB.« less" @default.
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- W75801128 date "1985-01-01" @default.
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- W75801128 title "Columbia River Basalts: isotopes, petrogenesis and a new variety" @default.
- W75801128 hasPublicationYear "1985" @default.
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