Petrology of the Guadalupe Igneous Complex South-western Sierra Nevada Foothills California

The Guadalupe igneous complex is one of several late Jurassic, mesozonal plutons in the foothills of the Sierra Nevada. Several lines of evidence suggest that the different rock types, ranging from eucrite to leucogranophyre, originated mainly through fractional crystallization of a parent basaltic...

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Bibliographic Details
Published in:Journal of petrology 1963, Vol.4 (2), p.223-259
Main Author: BEST, M. G.
Format: Article
Language:English
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Summary:The Guadalupe igneous complex is one of several late Jurassic, mesozonal plutons in the foothills of the Sierra Nevada. Several lines of evidence suggest that the different rock types, ranging from eucrite to leucogranophyre, originated mainly through fractional crystallization of a parent basaltic magma. Important differences between this complex and other large differentiated basic intrusions include the presence of steeply inclined but weak layering in the gabbroic rocks and an abundance of hydrous mafic minerals relative to olivine and pyroxene, which are not represented by iron-rich end-members in the granitic differentiates. Chemically, the differentiation trend is marked by a large variation in felsic parameters and only a weak enrichment in iron. This trend, which is similar to that of calc-alkaline suites of orogenic regions, may have been influenced by abnormally high pressures of water and oxygen for a crystallizing basaltic magma.
ISSN:0022-3530
1460-2415
DOI:10.1093/petrology/4.2.223