Seven Devils terrane: is it really a piece of Wrangellia ( USA)?

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21 Scopus citations

Abstract

The Seven Devils terrane of E Oregon and W Idaho has been correlated with the Wrangellia terrane, which is best exposed on Vancouver Island, British Columbia, and in the Wrangell Mountains, Alaska. However, geologic histories of these two terranes are different. The Triassic section of the Seven Devils terrane represents a volcanic arc of probable calc-alkalic affinity. The sequence of similar age in Wrangellia includes thick accumulations of tholeiitic pillow basalts, subaerial basalt flows, tuffs, and breccias, not an island-arc assemblage. Paleomagnetic and faunal evidence suggests that the Seven Devils terrane and Wrangellia could have formed close to one another but lithologic, geochemical, and stratigraphic data all militate against consanguinity of the Seven Devils arc and Wrangellia. -from Authors

Original languageEnglish (US)
Pages (from-to)634-637
Number of pages4
JournalGeology
Volume11
Issue number11
DOIs
StatePublished - Jan 1 1983
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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