| Diagenesis and Metamorphism of Triassic Flysch Along Profile Zoigê-Lushan, Northwest Sichuan, China |
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| 作者姓名： | WANG Hejing M. RAHN TAO Xiaofeng ZHENG Nan XU Tingjing |
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| 作者单位： | Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871, China;Hauptabteilung für die Sicherheit der Kernanlagen, 5232 Villigen-HSK, Switzerland;College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| 基金项目： | This study was supported by the National Natural Science Foundation of China (Grant No. 40572032) and the open fund of the central laboratory of Peking University (No. 14 and 15). |
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| 摘 要： | We used illite and chlorite crystallinities, index minerals, mineral assemblages, polytype and domain size of white mica, electron microprobe analysis (EMPA), b0 geobarometer and chlorite geothermometer to quantify the diagenetic and metamorphic overprint on the Triassic flysch formations in the Songpan-Garzê orogen along profile Zoigê-Lushan, northwest Sichuan. Two anchizones, two epizones, one diagenetic zone and a transition belt in-between them are defined on the basis of the obtained data. Illite crystallinity correlates strongly with the best mean domain size of mica and moderately with chlorite crystallinity. 2M1 white mica polytype are observed within the epizone whilst 2M1 and 1M polytypes occur in the anchizone and diagenetic zone. Epizonal metamorphism reached maximum temperatures of 370oC±21oC at low-to intermediate pressure conditions. Clay minerals underwent Ostwald ripening during metamorphism. Rocks from both sides of the Longmenshan fault reveal contrasting degrees of metamorphic overprint: on the northwest side of the Longmenshan fault, epimetamorphic conditions contrast with diagenetic rocks on the southeast side.
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| 关 键 词： | diagenesis metamorphism Songpan-Garzê orogen Triassic flysch illite crystallinity Longmenshan fault |
Diagenesis and Metamorphism of Triassic Flysch Along Profile Zoige-Lushan, Northwest Sichuan, China |
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| Authors: | WANG Hejing M RAHN TAO Xiaofeng ZHENG Nan XU Tingjing |
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| Institution: | [1]Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China; School of Earth and Space Sciences, Peking University, Beijing 100871, China [2]Hauptabteilung fiir die Sicherheit der Kernanlagen, 5232 Villigen-HSK, Switzerland [3]College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China |
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