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GEOREF RECORD

Precambrian history of the eastern Ferris Mountains and Bear Mountain, south-central Wyoming Province

Nancy E. Bowers and Kevin R. Chamberlain
Precambrian history of the eastern Ferris Mountains and Bear Mountain, south-central Wyoming Province (in The Wyoming Province; a distinctive Archean craton in Laurentian North America--La Province de Wyoming; un craton archeen distinctif dans la Laurentia en Amerique du Nord, Paul A. Mueller (editor) and Carol D. Frost (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (October 2006) 43 (10): 1467-1487

Abstract

The eastern Ferris Mountains and Bear Mountain area of south-central Wyoming contain a complex assemblage of Archean and Proterozoic rock units, including a metasedimentary and metavolcanic supracrustal sequence named the Spanish Mine metamorphic suite, three granitic plutons (Turkey Creek, Ferris Mountains, Bear Mountain), and at least three sets of mafic dikes. The Spanish Mine metamorphic suite was deposited, intruded by mafic sills and (or) dikes, and underwent amphibolite-grade metamorphism and folding just prior to, or synkinematic with, the intrusion of the Turkey Creek metaplutonic suite, U-Pb dated at 2733.5+ or -2 Ma. A second set of mafic dikes intruded the Turkey Creek metaplutonic suite prior to mylonitic shearing and late-stage folding along the Miners Canyon shear zone. These events were followed by intrusion of the Ferris Mountains plutonic suite at approximately 2717 Ma. The emplacement of the yet undated granite of Bear Mountain records the last phase of Neoarchean magmatism. The timing of magmatism and deformation support a model that the Ferris Mountains basement rocks formed in an arc terrane distinct from the older Wyoming craton and were accreted to the province in the Neoarchean. Intrusion of a third mafic dike set is dated at 2113+ or -15 Ma and may date the silicified, epidote-rich zones that crosscut all of the Archean rock units. Lead isotopic compositions of galena within the Spanish Mine metamorphic suite indicate additional Proterozoic activity and mineralization.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 43
Serial Issue: 10
Title: Precambrian history of the eastern Ferris Mountains and Bear Mountain, south-central Wyoming Province
Title: The Wyoming Province; a distinctive Archean craton in Laurentian North America--La Province de Wyoming; un craton archeen distinctif dans la Laurentia en Amerique du Nord
Author(s): Bowers, Nancy E.Chamberlain, Kevin R.
Author(s): Mueller, Paul A.editor
Author(s): Frost, Carol D.editor
Affiliation: 1401 Lost Valley Road, Dripping Springs, TX, United States
Affiliation: University of Florida, Department of Geological Sciences, Gainesville, FL, United States
Pages: 1467-1487
Published: 200610
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 61
Accession Number: 2007-035546
Categories: StratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., 3 tables, geol. sketch maps
N42°13'00" - N42°16'60", W107°15'00" - W107°00'00"
Secondary Affiliation: Unviersity of Wyoming, USA, United StatesUniversity of Wyoming, USA, United States
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200710
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