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Significance of mid-Mesozoic peridotitic to dioritic intrusive complexes, Klamath Mountains–western Sierra Nevada, California

Snoke, Arthur W. and Sharp, Warren D. and Wright, James E. and Saleeby, Jason (1982) Significance of mid-Mesozoic peridotitic to dioritic intrusive complexes, Klamath Mountains–western Sierra Nevada, California. Geology, 10 (3). pp. 160-166. ISSN 0091-7613. https://resolver.caltech.edu/CaltechAUTHORS:20140811-092608688

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Abstract

A mid-Mesozoic plutonic suite ranging from ultramafic-gabbroic rocks to dioritic rocks and commonly intruded by younger granitoids is widespread in the Klamath Mountains–western Sierra Nevada, California. The ultramafic-gabbroic rocks are clinopyroxene-rich and commonly vary from wehrlite to olivine-hornblende clinopyroxenite and melagabbro. Associated dioritic rocks include biotite–two-pyroxene diorite–monzodiorite, and the granitic rocks typically range from tonalite to granodiorite. These plutonic complexes are coextensive and broadly coeval with a suite of weakly metamorphosed volcanic rocks ranging in composition from basalt to basaltic andesite to andesite. The volcanic rocks are chiefly volcaniclastic and are characterized by several distinct phenocryst assemblages: clinopyroxene + plagioclase (± olivine or hornblende). The plutonic complexes and the associated volcanic rocks are restricted to terranes that lack continental (sialic) crust and that, at least locally, contain juvenile ophiolitic crust generated adjacent to the locus of magmatism. Thus, their petrogenesis may be related to recurrent fracturing and magmatism within a rifted ensimatic arc.


Item Type:Article
Related URLs:
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http://dx.doi.org/10.1130/0091-7613(1982)10<160:SOMPTD>2.0.CO;2 DOIArticle
http://geology.geoscienceworld.org/content/10/3/160PublisherArticle
http://geology.gsapubs.org/content/10/3/160PublisherArticle
Additional Information:© 1982 Geological Society of America. Manuscript received July 2, 1981; Revised manuscript received December 10, 1981; Manuscript accepted December 28, 1981. Reviewed by W. P. Irwin and R. A. Schweickert. Supported by a faculty research grant from the University of South Carolina (Snoke's recent field studies in the Klamath Mountains), National Science Foundation Grants EAR-7708691 and EAR-7925998 (Saleeby and Sharp), and Geological Society of America Penrose grants 2124-76 and 2411-78 and National Science Foundation Grant EAR-8107735 (Wright).
Funders:
Funding AgencyGrant Number
University of South CarolinaUNSPECIFIED
NSFEAR-7708691
NSFEAR-7925998
Geological Society of America Penrose Bequest Research Grants2124-76
Geological Society of America Penrose Bequest Research Grants2411-78
NSFEAR-8107735
Issue or Number:3
Record Number:CaltechAUTHORS:20140811-092608688
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140811-092608688
Official Citation:Arthur W. Snoke, Warren D. Sharp, James E. Wright, and Jason B. Saleeby Significance of mid-Mesozoic peridotitic to dioritic intrusive complexes, Klamath Mountains–western Sierra Nevada, California Geology, March, 1982, v. 10, p. 160-166, doi:10.1130/0091-7613(1982)10<160:SOMPTD>2.0.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48289
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Aug 2014 16:37
Last Modified:03 Oct 2019 07:02

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