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Geochemical recognition of a captured back-arc basin metabasaltic complex, southwestern Oregon

Journal of Geology

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Abstract

An extensive fault-bounded amphibolite terrane of Late Jurassic (145 ?? 2 Ma) metamorphic age occurring in the northeastern Klamath Mountains of southern Oregon has been recognized as the remnants of an ancient back-arc basin. In spite of thorough metamorphic recrystallization under amphibolite-facies conditions, the amphibolite locally displays relict igneous textures which suggest that the protoliths included basaltic dikes or sills, shallow diabase intrusions, and gabbros. The geochemical data, together with the present-day geologic context, indicate that the tectonic setting of eruption/intrusion was probably within a back-arc basin that existed inboard (east) of a pre-Nevadan volcanic arc. The basalt (now amphibolite) and the overlying sediments (now the May Creek Schist) were metamorphosed and deformed during accretion to North America during the Late Jurassic Nevadan orogeny. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geochemical recognition of a captured back-arc basin metabasaltic complex, southwestern Oregon
Series title:
Journal of Geology
Volume
99
Issue:
5
Year Published:
1991
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geology
First page:
711
Last page:
728