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Continental detrital zircon in Carboniferous ensimatic arc rocks, Bragdon Formation, eastern Klamath terrane, northern California

Miller, M. Meghan and Saleeby, Jason (1991) Continental detrital zircon in Carboniferous ensimatic arc rocks, Bragdon Formation, eastern Klamath terrane, northern California. Geological Society of America Bulletin, 103 (2). pp. 268-276. ISSN 0016-7606. https://resolver.caltech.edu/CaltechAUTHORS:20140825-080835740

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Abstract

New U-Pb isotopic data for detrital zircon populations from the Upper Devonian(?) and lower Carboniferous Bragdon Formation add constraints to the nature of source areas for epiclastic rocks in the ensimatic eastern Klamath arc terrane. Bragdon clastic units include lithic-rich sandstone containing quartz, chert, and sedimentary-lithic clasts, volcanic-lithic-rich sandstone, and crystal-rich tuffaceous sand- stone. These three compositions reflect a composite source that contained sedimentary and low-grade metasedimentary rocks, volcanic rocks, and penecontemporaneous volcanic debris. U-Pb isotopic data from detrital zircon indicate an ultimate Precambrian continental source for components of the Bragdon Formation and corroborate the previous suggestion that lower Paleozoic rocks of the Shoo Fly Complex, Yreka terrane, or related rocks may have been the immediate (last-cycle) sources. In modern convergent margins, a complex and ongoing relationship between ensimatic arc volcanism and continental sediment sources may be expected from the pattern of oceanic subduction zones that generally dip toward continents and intervening marginal basin systems, providing a context for understanding the presence of continent-derived detritus in an ancient ensimatic arc.


Item Type:Article
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http://dx.doi.org/10.1130/0016-7606(1991)103<0268:CDZICE>2.3.CO;2DOIArticle
http://bulletin.geoscienceworld.org/cgi/doi/10.1130/0016-7606(1991)103%3C0268:CDZICE%3E2.3.CO;2PublisherArticle
http://gsabulletin.gsapubs.org/cgi/doi/10.1130/0016-7606(1991)103%3C0268:CDZICE%3E2.3.CO;2PublisherArticle
Additional Information:© 1991 Geological Society of America. Manuscript received by the Society September 7, 1989; Revised manuscript received May 29, 1990; Manuscript accepted June 8, 1990. The Division of Geological and Planetary Sciences, California Institute of Technology, provided salary and research funds to M. M. Miller from the I.B.M. Fellowship and Division funds; I.B.M. is also gratefully acknowledged. Isotopic studies were supported by National Science Foundation Grant EAR 87-08266 awarded to J. B. Saleeby. John Goodge and R. C. Speed thoughtfully reviewed the manuscript.
Funders:
Funding AgencyGrant Number
Caltech Division of Geological and Planetary SciencesUNSPECIFIED
I.B.M. FellowshipUNSPECIFIED
NSFEAR 87-08266
Issue or Number:2
Record Number:CaltechAUTHORS:20140825-080835740
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140825-080835740
Official Citation:M. MEGHAN MILLER and JASON B. SALEEBY Continental detrital zircon in Carboniferous ensimatic arc rocks, Bragdon Formation, eastern Klamath terrane, northern California Geological Society of America Bulletin, February, 1991, v. 103, p. 268-276, doi:10.1130/0016-7606(1991)103<0268:CDZICE>2.3.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48828
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:25 Aug 2014 19:22
Last Modified:03 Oct 2019 07:08

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