Mesozoic invasion of crust by MORB-source asthenospheric magmas, US Cordilleran interior

J. A. Leventhal, M. R. Reid, A. Montana, P. Holden

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Mafic and ultramafic xenoliths entrained in lavas of the Cima volcanic field have Nd and Sr isotopic ratios indicative of a source similar to that of mid-ocean ridge basalt (MORB). Nd and Sr internal isochrons demonstrate a Late Cretaceous intrusion age. These results, combined with evidence for emplacement in the lower crust and upper mantle, indicate invasion of the lower crust by asthenospheric magmas in the Late Cretaceous. Constituting the first prima facie evidence for depleted-mantle magmatism in the Basin and Range province prior to late Cenozoic volcanism, these results lend key support to models suggesting crustal heating by ascent of asthenosphere in the Mesozoic Cordilleran interior. -Authors

Original languageEnglish (US)
Pages (from-to)399-402
Number of pages4
JournalGeology
Volume23
Issue number5
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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