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Evidence from the lamarck granodiorite for rapid late cretaceous crust formation in California

Science

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Abstract

Strontium and neodymium isotopic data for rocks from the voluminous 90-million-year-old Lamarck intrusive suite in the Sierra Nevada batholith, California, show little variation across a compositional range from gabbro to granite. Data for three different gabbro intrusions within the suite are identical within analytical error and are consistent with derivation from an enriched mantle source. Recognition of local involvement of enriched mantle during generation of the Sierran batholith modifies estimates of crustal growth rates in the United States. These data indicate that parts of the Sierra Nevada batholith may consist almost entirely of juvenile crust added during Cretaceous magmatism.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Evidence from the lamarck granodiorite for rapid late cretaceous crust formation in California
Series title:
Science
Volume
258
Issue:
5090
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1924
Last page:
1926