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An archean suture zone in the Tobacco Root Mountains? (1984) Evolution of Archean Continental Crust, SW Montana (1985)The Lake Plateau area of the Beartooth Mountains, Montana were mapped and geochemically sampled. The allochthonous nature of the Stillwater Complex was interpreted as a Cordilleran-style continental margin. The metamorphic and tectonic history of the Beartooth Mountains was addressed. The Archean geology of the Spanish Peaks area, northern Madison Range was addressed. A voluminous granulite terrain of supracrustal origin was identified, as well as a heretofore unknown Archean batholithic complex. Mapping, petrologic, and geochemical investigations of the Blacktail Mountains, on the western margin of the Wyoming Province, are completed. Mapping at a scale of 1:24000 in the Archean rocks of the Gravelly Range is near completion. This sequence is dominantly of stable-platform origin. Samples were collected for geothermometric/barometric analysis and for U-Pb zircon age dating. The analyses provide the basis for additional geochemical and geochronologic studies. A model for the tectonic and geochemical evolution of the Archean basement of SW Montana is presented.
Document ID
19860014590
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Mogk, D. W. (Montana State Univ. Bozeman, MT, United States)
Kain, L. (Montana State Univ. Bozeman, MT, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1985
Subject Category
Geophysics
Report/Patent Number
NAS 1.26:176726
NASA-CR-176726
Accession Number
86N24061
Funding Number(s)
CONTRACT_GRANT: NAG9-68
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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