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GEOREF RECORD

Continental detrital zircon in Carboniferous ensimatic arc rocks, Bragdon Formation, eastern Klamath Terrane, Northern California

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) 103 (2): 268-276

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.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 103
Serial Issue: 2
Title: Continental detrital zircon in Carboniferous ensimatic arc rocks, Bragdon Formation, eastern Klamath Terrane, Northern California
Affiliation: Calif. Inst. Technol., Div. Geol. and Planet. Sci., Pasadena, CA, United States
Pages: 268-276
Published: 199102
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 68
Accession Number: 1991-010824
Categories: Sedimentary petrologyGeochronologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N41°08'60" - N41°10'00", W122°05'60" - W122°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1991
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