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Early Devonian tectonic conversion from contraction to extension in the Chinese Western Tianshan: A response to slab rollback

文献类型：期刊论文

作者Wang, Xin-Shui3,4; Klemd, Reiner5; Gao, Jun2,3; Jiang, Tuo1; Zhang, Xi6
刊名GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期2021-07-01
卷号133期号:7-8页码:1613-1633
ISSN号0016-7606
DOI10.1130/B35760.1
英文摘要Extensive angular unconformities that occur across the Tianshan Orogen provide insight into the Paleozoic tectonic evolution of the southwestern Central Asian Orogenic Belt. This study presents new geochronological and geochemical data to unravel the age and origin of a pronounced angular unconformity in the Baluntai domain of the Chinese Western Tianshan. The angular unconformity separates a ductilely deformed metamorphic complex from overlying unmetamorphosed sequences. Detrital zircon age spectra suggest that the sedimentary samples received detritus from both the Precambrian basement and contemporaneous igneous rocks in the Central Tianshan and Yili blocks. The youngest detrital and metamorphic zircons in metasediments from the metamorphic complex reveal that their protoliths were deposited at ca. 419 Ma, and subsequently overprinted by metamorphism and ductile deformation at ca. 409 Ma. Along with ca. 532-407 Ma metavolcanics and foliated intrusions, the metamorphic complex constitutes a diachronous stratigraphic unit deposited during early Cambrian to late Silurian times, rather than a Precambrian basement as previously thought. The youngest detrital zircon age data from siliciclastic samples immediately above the angular unconformity constrain their deposition to ca. 407-397 Ma. In conjunction with a ca. 406 Ma rhyolitic tuff in the lower terrestrial siliciclastic unit and an early Carboniferous paleontological age of carbonates in the upper shallow-marine unit, it is suggested that the overlying unmetamorphosed sequences were accumulated during the early Devonian to the early Carboniferous. Thus, the angular unconformity in the Baluntai domain was formed between ca. 409 and 407 Ma. New and already published geochemical data reveal that the early Paleozoic (ca. 530-410 Ma) and late Paleozoic (ca. 410-320 Ma) igneous rocks are mainly medium- to high-K calc-alkaline I-type granitoids, which exhibit typical subduction-related geochemical signatures despite contrasting structural features. These geochronological and geochemical results are in accordance with those of similar early Devonian angular unconformities and Paleozoic igneous rocks in the southern Yili Block. The early Paleozoic igneous rocks display highly scattered zircon epsilon(Hf )(t) values, while the late Paleozoic rocks show a progressively increasing trend toward more positive values, attributed to slab rollback of the northward subducting South Tianshan Ocean under the Yili and Central Tianshan blocks. Thus, we propose that the formation of the angular unconformity was caused by tectonic conversion from contraction to extension due to slab rollback during the early Devonian. This study highlights the significance of geological and geochronological investigations of angular unconformities in the context of associated episodic magmatism and slab behavior in order to unravel distinct tectonic processes in the long-lived accretionary evolution of the Chinese Western Tianshan.
WOS关键词ASIAN OROGENIC BELT ; U-PB GEOCHRONOLOGY ; CARBONIFEROUS VOLCANIC-ROCKS ; SOUTHERN YILI BLOCK ; A-TYPE GRANITES ; HP-UHP ROCKS ; NW-CHINA ; METAMORPHIC COMPLEX ; HIGH-PRESSURE ; ZIRCON AGES
资助项目National Natural Science Foundation of China[41390440] ; National Natural Science Foundation of China[41390445] ; National Natural Science Foundation of China[41902232] ; China Geological Survey[DD20190060] ; China Postdoctoral Science Foundation[2016M600127] ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program
WOS研究方向Geology
语种英语
WOS记录号WOS:000672732700015
出版者GEOLOGICAL SOC AMER, INC
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program ; Sino-German (China Scholarship Council-Deutscher Akademischer Austausch Dienst) Postdoc Scholarship Program
源URL[http://ir.iggcas.ac.cn/handle/132A11/101945]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Gao, Jun
作者单位1.China Geol Survey, Lab Isotope Geochem, Wuhan Ctr, Wuhan 430205, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
5.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany
6.China Minmet Corp, Beijing 100010, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Xin-Shui,Klemd, Reiner,Gao, Jun,et al. Early Devonian tectonic conversion from contraction to extension in the Chinese Western Tianshan: A response to slab rollback[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2021,133(7-8):1613-1633.
APA Wang, Xin-Shui,Klemd, Reiner,Gao, Jun,Jiang, Tuo,&Zhang, Xi.(2021).Early Devonian tectonic conversion from contraction to extension in the Chinese Western Tianshan: A response to slab rollback.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,133(7-8),1613-1633.
MLA Wang, Xin-Shui,et al."Early Devonian tectonic conversion from contraction to extension in the Chinese Western Tianshan: A response to slab rollback".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 133.7-8(2021):1613-1633.

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来源：地质与地球物理研究所

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