https://scholars.lib.ntu.edu.tw/handle/123456789/412508
標題: | Seismic evidence for a mantle suture and implications for the origin of the Canadian Cordillera | 作者: | Chen, Yunfeng Gu, Yu Jeffrey Currie, Claire A. Johnston, Stephen T. SHU-HUEI HUNG Schaeffer, Andrew J. Audet, Pascal |
公開日期: | 1-十二月-2019 | 出版社: | NATURE PUBLISHING GROUP | 卷: | 10 | 期: | 1 | 來源出版物: | Nature Communications | 摘要: | © 2019, The Author(s). The origin of the North American Cordillera and its affinity with the bounding craton are subjects of contentious debate. The mechanisms of orogenesis are rooted in two competing hypotheses known as the accretionary and collisional models. The former model attributes the Cordillera to an archetypal accretionary orogen comprising a collage of exotic terranes. The latter, less popular view argues that the Cordillera is a collisional product between an allochthonous ribbon microcontinent and cratonic North America. Here we present new seismic evidence of a sharp and structurally complex Cordillera–craton boundary in the uppermost mantle beneath the southern Canadian Cordillera, which can be interpreted as either a reshaped craton margin or a Late Cretaceous collisional boundary based on the respective hypotheses. This boundary dips steeply westward underneath a proposed (cryptic) suture in the foreland, consisent with the predicted location and geometry of the mantle suture, thus favoring a collisional origin. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/412508 | ISSN: | 2041-1723 | DOI: | 10.1038/s41467-019-09804-8 |
顯示於: | 地質科學系 |
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s41467-019-09804-8 (1).pdf | 1.93 MB | Adobe PDF | 檢視/開啟 |
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