Ductile Shearing Age of the South Altun Fault and Its Tectonic Implications
详细信息
- 责任者：Cui Junwen (State Key Laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; CAGS ; Beijing 100037 ; China)
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(11)
- 关键词：构造演化 ; structural evolution ; 韧性剪切带 ; ductile shear zones ; 阿尔金断裂带 ; Altun Fracture Zone
- 页码：p.3422-3434
- 图表：8 illus., 2 tables, 29 refs.
- 分类号：0300
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The South Altun fault, lying between the Neoarchean-Paleoproterozoic high-grade metamorphic rocks of the Altun Group and the Meso-Neoproterozoic low-grade metamorphic rocks in the Altun hinterland, is a roughly E-W-trending and slightly S-dipping high-angle large thrust fault. However, it is indicated by the (491.3±4.6)～(413.8±8.0) Ma calc-alkaline granites widely distributed north of the fault and the (500±10)～(519±37) Ma eclogite and amphibole-mylonite exposed on the south side of the fault that there had been a lithosphere-scale subduction from south to north along the fault before a thrust-type ductile shearing of north polarity occurred. Therefore, this fault is an important convergance and collision zone of Early Paleozoic plates in the Altun hinterland.
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