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- W252340867 abstract "New isotopic data for the 1.47 Ga Eastern Granite-Rhyolite Province and the 1.37 Ga Southern Granite-Rhyolite Province require re-examination of models for the origin of these suites of rock. For the most part, eNd(t) values for the granite-rhyolite provinces and A-type plutons intrusive into adjacent Early proterozoic basement are compatible with origin through melting of 1.8 Ga continental crust. However, new data shows that southeastern parts of the granite-rhyolite provinces yield positive [var epsilon]Nd(t) data is an E-W trending belt of intermediate values in northern Oklahoma; [var epsilon]Nd(t) data south of this belt, in s. Oklahoma, are equivalent to that in Kansas and Nebraska, reflecting cal 1.8 Ga lower crust. The granite-rhyolite provinces are not related to any well defined tectonic event, and they have commonly been referred to as anorogenic. The thermal event responsible for producing the silicic melts may have been associated with an extensional regime, in view of the a-type character of the granites." @default.
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- W252340867 date "1993-03-01" @default.
- W252340867 modified "2023-09-24" @default.
- W252340867 title "Re-examination of models for the origin of granite-rhyolite provinces in the midcontinent region, USA" @default.
- W252340867 hasPublicationYear "1993" @default.
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