| 华南印支期碰撞造山--十万大山盆地构造和沉积学证据 |
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| 引用本文： | 梁新权,李献华,丘元禧,杨东生.华南印支期碰撞造山--十万大山盆地构造和沉积学证据[J].大地构造与成矿学,2005,29(1):99-112. |
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| 作者姓名： | 梁新权 李献华 丘元禧 杨东生 |
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| 作者单位： | 中国科学院广州地球化学研究所,广东,广州,510640;中山大学地质系,广东,广州,510275 |
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| 基金项目： | 国家自然科学基金，中国博士后科学基金，40272092,40334039，200333418，， |
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| 摘 要： | 十万大山盆地是云开造山带前陆地区的一个窄长的晚二叠世—中三叠世沉积盆地,位于扬子与华夏陆块拼接位置的西南端。十万大山盆地晚二叠世—中三叠世沉积由巨厚的磨拉石建造组成,并构成多个向上变粗和向上变细的构造-地层层序。云开造山带及前陆冲断带上泥盆统至下二叠统中发育了大量的印支期形成的薄皮褶皱和冲断构造。这些指示扬子和华夏陆块在印支期发生了强烈陆内碰撞与会聚及前陆盆地的沉积作用。P2 /P1 之间的不整合面是伸展构造向挤压构造转换的转换面,为华南印支期碰撞挤压造山或活化造山的序幕。T3 /T2 之间不整合面是挤压构造向伸展构造转换的转换面,是印支期活化挤压造山结束的界面,标志着晚二叠世开始的碰撞造山作用的结束。华南内部晚二叠世—中三叠世构造运动性质及转换与当时华南南缘存在的古特提斯洋的闭合及印支板块与华南陆块的碰撞作用有关。
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| 关 键 词： | 碰撞活化造山 构造变形和沉积物记录 晚二叠世-中三叠世 十万大山盆地 |
| 文章编号： | 1001-1552(2005)01-0099-14 |
INDOSINIAN COLLISIONAL OROGENY: EVIDENCE FROM STRUCTURAL AND SEDIMENTARY GEOLOGY IN SHIWANDASHAN BASIN, SOUTH CHINA |
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| LIANG Xinquan,LI Xianhua,QIU Yuanxi and YANG Dongsheng.INDOSINIAN COLLISIONAL OROGENY: EVIDENCE FROM STRUCTURAL AND SEDIMENTARY GEOLOGY IN SHIWANDASHAN BASIN, SOUTH CHINA[J].Geotectonica et Metallogenia,2005,29(1):99-112. |
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| Authors: | LIANG Xinquan LI Xianhua QIU Yuanxi and YANG Dongsheng |
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| Institution: | LIANG Xinquan~1,LI Xianhua~1,QIU Yuanxi~2 and YANG Dongsheng~1 |
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| Abstract: | The Shiwandashan Basin is an elongate Late Permian to Middle Triassic sedimentary basin in the foreland of the Yunkai Orogenic Belt. It is situated in the eastern part of Guangxi Zhuang Autonomous Region, at the southwestern end of the suture between the Yangtze and Cathaysian blocks in south China. The Late Permian-Middle Triassic succession of the basin is composed of thick, coarse molasse deposits and fine clastics, organized into coarsening-upward and fining-upward stratigraphic sequences. Thin-skinned folding and thrusting developed in Foreland Fold-thrust Belt and Yunkai Orogenic Belt, involving Upper Devonian to Lower Permian strata, took place during the period of Late Permian to Middle Triassic. The deposition of the foreland basin and the intracontinental shortening are the response to the Indosinian collision and convergence between the Yangtze and Cathaysian blocks. The unconformity interface between Upper Permian and Lower Permian strata represents a transform surface from extensional to compressional tectonics in response to the initial stage of the Indosinian orogeny. In contrast, the unconformity boundary between Upper Triassic and Middle Triassic strata corresponds to a basin-range transitional surface from compressional to extensional tectonics formed during the Late to Post Indosinian orogeny. Dynamics of Late Permian to Middle Triassic orogenesis and basinogenesis was probably related to the disappearance of Paleo-Tethys existing at the southern margin of the south China and the convergence and collision between the Yangtze and Cathaysia blocks caused by the collision of Indochina with south China blocks. They together controlled tectono- sedimentary responses in south China, especially in the suture between the Yangtze and Cathaysia blocks. |
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| Keywords: | collisional and activated orogeny structural deformation and sedimentary record Late Permian to Middle Triassic Shiwandashan basin |
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