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Science 18 December 1992:
Vol. 258. no. 5090, pp. 1924 - 1926
DOI: 10.1126/science.258.5090.1924
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Articles
Evidence from the Lamarck Granodiorite for Rapid Late Cretaceous Crust Formation in California
Drew S. Coleman 1,
Allen F. Glazner 1, and
Thomas P. Frost 2
1 Department of Geology, University of North Carolina, Chapel Hill, NC 27599
2 U.S. Geological Survey, West 904 Riverside Avenue Spokane, WA 99201
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.
Submitted on June 12, 1992
Accepted on October 22, 1992
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