EVIDENCE FROM THE LAMARCK GRANODIORITE FOR RAPID LATE CRETACEOUS CRUST FORMATION IN CALIFORNIA

被引:78
作者
COLEMAN, DS
FROST, TP
GLAZNER, AF
机构
[1] UNIV N CAROLINA,DEPT GEOL,CHAPEL HILL,NC 27599
[2] US GEOL SURVEY,SPOKANE,WA 99201
关键词
D O I
10.1126/science.258.5090.1924
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
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页码:1924 / 1926
页数:3
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