| 安徽省主要构造地质要素的变形 |
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| 引用本文： | 徐树桐,周海渊,董树文,陈冠宝,张维明.安徽省主要构造地质要素的变形[J].地质科学,1986,0(4):311-322. |
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| 作者姓名： | 徐树桐 周海渊 董树文 陈冠宝 张维明 |
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| 作者单位： | 安徽省地质研究所 |
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| 摘 要： | 安徽省在中国东部的中心部位,跨越不同的构造地质单元。前寒武纪变质岩出露面积约占基岩出露面积的三分之一。变质岩包括太古宙、元古宙及少部分古生代地层;变质相包括麻粒岩相到低级绿片岩相。其中发育有多期褶皱变形和同变质期的断层作用,这些断层在后继变形过程中被改造和复活,形成十分复杂的构造地质图案。
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| 关 键 词： | , |
| 收稿时间： | 1985-03-01 |
| 修稿时间： | 1985-03-01; |
DEFORMATION AND EVOLUTION OF THE PREDOMINANT STRUCTURAL ELEMENTS IN ANHUI PROVINCE, CHINA |
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| Xu Shutong,Zhou Haiyuan,Dong Shuwen,Ghen Guanbao,Zhang Weiming.DEFORMATION AND EVOLUTION OF THE PREDOMINANT STRUCTURAL ELEMENTS IN ANHUI PROVINCE, CHINA[J].Chinese Journal of Geology,1986,0(4):311-322. |
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| Authors: | Xu Shutong Zhou Haiyuan Dong Shuwen Ghen Guanbao Zhang Weiming |
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| Institution: | Geological Institute of Anhui Province, Hefei |
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| Abstract: | The predominant structural elements and their tectonic evolution define the tectonic regime in Anhui Province. Each predominant structural element is composed of a number of subordinate ones which show their features with numerous mesoscopic structural elements or fabrics within them. We discuss here the topic on the basis of our own investigation and the repor. of survey of regional geology on the scale of 1:200000,and come to a conclusion quite different from the preorous one. We find that the present tectonic regime of Anhui Province was budding during late Proterozoic and accomplished during Mesozoic,especilly Indo-China episode. The predominant structural elements are:1. Dabie Mountain Nappe. It comprises mainly metamorphic complex of greenschist,am-phibolite,a few granulite,granite and diorite. The most important structural elements in tins nappe are two Proterozoic ductile tectonic (or ophiolitic) melange zones with a ductile lateral shear belt,a Mesozoic foreland belt and bridle tectonic melange in the leading edge and a suc-cesor basin in the back side. Vergence and strain markers indicate the southward movement of the nappe.2. Wan (Anhui) Zhe (Zhejiang) Gan (Jiangxi) nappe located in the southeast of studied area with a small segment of its leading edge. That is the Shexian-Xianxia fault zone or tectonic melange zone,in Anhui Province. Along this fault zone there are a number of tectonic blocks of late Paleozoic,early Jurassic sediments and mafic-ultramafic rocks,some of which showed brittle deformation and others ductile.3. Shear Zones around Yangtze River are in the terrane between the two nappes mentioned above. It is characterized by at first a set of counjugate semi-ductile shear zones striking NNE and NEE,and secondly the fold systems and thrusts trending NE,in which pre-Triassic strata are involued. All those structural elements are belived to result from simple strain. The S shaped extension faults,intrusions and strike-slip basins appeared to occur under simple shear subsequently.4. Zhangbaling tectonic slide is composed of metamorphic complex and borders on the north of the area around Yangtze River. Huaiibe (in Anhui)-Xuzhou (in Jiangsu)-Taier-zhuang (in Shandong) Nappe is just northwest to Zhangbaling tectonic slide. Pre-Juriassic strata are involved in two generation of folding and thrusting. The relationship between the tectonic slide and the Huaibe-Xuzhou-Taierzhuang Nappe is uncertain. If they are coeval,the former should be the root belt and the latter the cover thrust. Otherwise,they occurred in different epoches as we inferred. |
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