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U-Pb geochronology of two augen gneiss terranes, Idaho - new data and tectonic implications.

Canadian Journal of Earth Sciences

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Abstract

The augen-gneiss of Red River (Idaho) is interpreted as being approx 1370 m.y. old. U-Pb systematics of cogenetic zircons indicate at least one component of inherited radiogenic lead. Field relationships indicate some intense deformation of the host rocks prior to or synchronous with intrusion of the augen-gneiss of Red River. The augen-gneiss of Priest River is 1576 + or - 13 m.y. old, there being no indication of inherited radiogenic lead. The Priest River augen-gneiss probably forms a pre-belt basement that is either tectonically interleaved with belt strata, unconformably underlies belt strata, or both. In any case, the age of 1576 m.y. is probably a maximum for deposition of the Prichard formation.-J.M.H.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
U-Pb geochronology of two augen gneiss terranes, Idaho - new data and tectonic implications.
Series title:
Canadian Journal of Earth Sciences
Volume
23
Issue:
12
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Earth Sciences
First page:
1919
Last page:
1927