2024
DOI: 10.1130/b37203.1
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Jura-Cretaceous synorogenic magmatism and relations to supercontinental rifting in the northwestern U.S. Cordillera

Keith D. Gray,
K. Johnson,
David A. Foster
et al.

Abstract: Changes in lithospheric composition and strength associated with rifting of the Rodinian supercontinent (ca. 780−485 Ma) served to localize Mesozoic tectonic activity in the McCall region of west-central Idaho, USA. Although discrimination diagrams support slab failure melting, ca. 150−121 Ma calcic magmatism in the Hazard Creek complex and chemically similar intrusive rocks of northeastern Oregon, USA (e.g., Cornucopia stock), is best explained by progressive loading of oceanic crust. Westward-directed thrust… Show more

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