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GEOREF RECORD

Geodynamic implications of Devonian silicic arc magmatism in the Sierra Nevada and Klamath Mountains, California

O. Rouer, H. Lapierre, G. Mascle, C. Coulon and J. P. Albers
Geodynamic implications of Devonian silicic arc magmatism in the Sierra Nevada and Klamath Mountains, California
Geology (Boulder) (February 1989) 17 (2): 177-180

Abstract

Most proposed geodynamic models integrate the northern Sierra Nevada and eastern Klamath Mountains in a single island-arc system. New petrological and geochemical data show that the Upper Devonian Sierra Buttes Formation of the northern Sierra Nevada displays important differences from the Lower Devonian Balaklala Formation of the eastern Klamath Mountains. The cale-alkalic affinity of the Sierra Buttes rhyolites (light rare earth element [REE] enriched, low epsilon (sub Nd) ) suggests that they were erupted in a continent-based island arc. In contrast, the Lower Devonian Balaklala low-K tholeiitic rhyolites (light REE depleted, high epsilon (sub Nd) ) are considered to be part of an intraoceanic island-arc sequence. Moreover, the Paleozoic tectogenesis of these two island-arc sequences is different. The Lower Devonian Balaklala rhyolites were affected by the Late Devonian-Early Carboniferous orogeny, whereas the Sierra Buttes Formation is on basement already affected by a pre-Late Devonian deformation. Therefore, at least after Carboniferous time and before Late Triassic time, the eastern Klamath and northeastern Sierra Nevada island arcs cannot be considered lateral counterparts.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 17
Serial Issue: 2
Title: Geodynamic implications of Devonian silicic arc magmatism in the Sierra Nevada and Klamath Mountains, California
Affiliation: Univ. Nancy, Lab. Petrol., Vandoeuvre les Nancy, France
Pages: 177-180
Published: 198902
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 1989-026869
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N41°22'00" - N42°00'00", W124°19'60" - W123°34'60"
N41°00'00" - N43°00'00", W124°30'00" - W123°00'00"
N39°01'00" - N39°28'60", W121°16'00" - W120°00'00"
N39°34'60" - N40°25'00", W121°30'00" - W120°10'00"
N39°25'00" - N39°43'60", W121°00'00" - W120°00'00"
N41°00'00" - N42°00'00", W123°45'00" - W121°25'00"
Secondary Affiliation: Univ. Orleans, FRA, FranceUniv. Grenoble, FRA, FranceUniv. Aix-Marseille, FRA, FranceU. S. Geol. Surv., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1989
Program Name: USGSOPNon-USGS publications with USGS authors
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