Title: Provenance of the Bonner Formation (Belt Supergroup), Montana: Insights from U-Pb and Sm-Nd analyses of detrital minerals
Abstract: Research Article| April 01, 1991 Provenance of the Bonner Formation (Belt Supergroup), Montana: Insights from U-Pb and Sm-Nd analyses of detrital minerals Gerald M. Ross; Gerald M. Ross 1Geological Survey of Canada, 3303-33rd Street NW, Calgary, Alberta T2L 2A7, Canada Search for other works by this author on: GSW Google Scholar Randall R. Parrish; Randall R. Parrish 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Frank Ö. Dudás Frank Ö. Dudás 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Gerald M. Ross 1Geological Survey of Canada, 3303-33rd Street NW, Calgary, Alberta T2L 2A7, Canada Randall R. Parrish 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Frank Ö. Dudás 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (4): 340–343. https://doi.org/10.1130/0091-7613(1991)019<0340:POTBFB>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Gerald M. Ross, Randall R. Parrish, Frank Ö. Dudás; Provenance of the Bonner Formation (Belt Supergroup), Montana: Insights from U-Pb and Sm-Nd analyses of detrital minerals. Geology 1991;; 19 (4): 340–343. doi: https://doi.org/10.1130/0091-7613(1991)019<0340:POTBFB>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Individual detrital monazite grains from the Bonner Formation of the Belt Supergroup in southwestern Montana have been analyzed using U-Pb and Sm-Nd isotopes. Combined with single-grain U-Pb analyses of detrital zircon, these data place constraints on the age and isotopic characteristics of the source area, previously inferred to be to the west and south of the Belt basin. U-Pb ages from eight single zircon grains range from 1.70 to 1.86 Ga; two grains were ca. 2.6 Ga. U-Pb ages from five monazite grains range from 1.64 to 1.79 Ga. Sm-Nd analyses of these same monazite grains yield ϵNd at the time of crystallization of +0.7 to -14.5. These data suggest that the source area for this part of the Bonner Formation was an Early Proterozoic magmatic (orogenic?) belt with some reworked Archean material. It is postulated that this source area may have been the western edge of Archean crust (Wyoming craton) that was involved in younger magmatism, possibly continuous with rocks of similar age in southcentral Montana, the subsurface of Alberta, or the southwestern United States. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 1991
Publication Date: 1991-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 41
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