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Geochemistry and petrogenesis of Proterozoic diabase in the southern Death Valley region of California

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Abstract

Diabase sills and dikes of Proterozoic age intrude crystalline basement and the overlying Crystal Spring Formation in the southern Death Valley region of California. Despite pervasive deuteric alteration, analyses of relict plagioclase (An66-45), titaniferous augite, and ilmenite permit the calculation of initial crystallization temperatures of 1,165±25° C for plagioclase and 1,110±25° C for augite with an oxygen fugacity of 10−11 atm. The early crystallization of plagioclase is consistent with the generally subophitic texture of the diabase.

Geochemical arguments show that deuteric alteration has had little effect on the whole rock chemistry which has a mildly alkaline, transitional character. Mathematical models support the interpretation that chemical variations are principally the result of flow differentiation. Also, about 15 to 25% olivine or augite may have fractionated from the melt prior to intrusion. The mildly LREE enriched composition (normalized La/Yb=4.27 to 6.13) is best modelled by a 5% melt fraction from a moderately LREE-enriched source. Melt derived from a model garnet peridotite with accessory amphibole is compatible with the observed major and trace element chemistry. The diabase is compositionally akin to other middle Proterozoic basaltic rocks in North America which formed in extensional settings, and it is interpreted as a manifestation of widespread extensional tectonism.

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  1. Department of Geological Sciences, California State University, 90840, Long Beach, CA, USA

    Janet G. Hammond

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Hammond, J.G. Geochemistry and petrogenesis of Proterozoic diabase in the southern Death Valley region of California. Contr. Mineral. and Petrol. 93, 312–321 (1986). https://doi.org/10.1007/BF00389390

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