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DOI | 10.1130/B31809.1 |
Wopmay orogen revisited: Phase equilibria modeling, detrital zircon geochronology, and U-Pb monazite dating of a regional Buchan-type metamorphic sequence | |
St-Onge, Marc R.; Davis, William J. | |
2018-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130页码:678-704 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | The internal metamorphic-plutonic zone of the middle Paleoproterozoic Wopmay orogen, northwestern Canadian Shield, exposes an oblique section through a prograde Buchan-type metamorphic sequence. New petrographic, petrologic, and geochronologic analyses of pelite and quartz arenite samples from the eastern margin of the internal zone quantify the evolving conditions and timing of metamorphism and enable the discriminant evaluation of competing tectonic models. Study of fabric development and mineral growth relationships indicates that prograde metamorphism occurred late within a craton-verging, crustal-shortening ("Calderian") deformation event. Phase equilibria modeling was used to calculate pressure-temperature (P-T) path segments and determine peak conditions from andalusite-muscovite grade at similar to 3.3 kbar and 575 degrees C to sillimanite-K-feldspar +/- granitic leucosome grade at similar to 4.8-6.2 kbar and 670-745 degrees C. In situ monazite geochronology indicates that thermal peak metamorphic conditions were reached between 1878.6 +/- 6.5 Ma and 1872 +/- 9 Ma. Ages of detrital zircon within quartz arenite across the width of the metamorphic sequence document a diagnostic easterly Slave craton-Thelon tectonic zone derivation that links the metasedimentary rocks, including those previously considered to be "exotic" in a proposed tectonic klippe model for the internal zone, to the adjacent craton. Integration of these results with observations on the relatively low state of strain and the bracketing of a common (single) metamorphic field gradient for all garnet-bearing mineral zones confirm that the latter have preserved their prograde isogradic continuity from time of formation, and that the leading edge of a tectonic klippe consisting of rocks exotic to the Coronation margin does not traverse the study area. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427362500018 |
WOS关键词 | NORTHWESTERN CANADIAN SHIELD ; BEAR MAGMATIC ZONE ; PARTIAL MELTING EQUILIBRIA ; ARCHEAN SLAVE PROVINCE ; HOTTAH TERRANE ; 1.9 GA ; NEOARCHEAN TURBIDITES ; AUTOCHTHONOUS COVER ; TECTONIC EVOLUTION ; CONTINENTAL-MARGIN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24452 |
专题 | 地球科学 |
作者单位 | Geol Survey Canada, 601 Booth St, Ottawa, ON K1A 0E8, Canada |
推荐引用方式 GB/T 7714 | St-Onge, Marc R.,Davis, William J.. Wopmay orogen revisited: Phase equilibria modeling, detrital zircon geochronology, and U-Pb monazite dating of a regional Buchan-type metamorphic sequence[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:678-704. |
APA | St-Onge, Marc R.,&Davis, William J..(2018).Wopmay orogen revisited: Phase equilibria modeling, detrital zircon geochronology, and U-Pb monazite dating of a regional Buchan-type metamorphic sequence.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,678-704. |
MLA | St-Onge, Marc R.,et al."Wopmay orogen revisited: Phase equilibria modeling, detrital zircon geochronology, and U-Pb monazite dating of a regional Buchan-type metamorphic sequence".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):678-704. |
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