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| 中国东西部地貌边界带晚新生代构造变形历史与青藏高原东缘隆升过程初步研究 | |
| 引用本文： | 张岳桥,杨农,陈文,马寅生,孟晖.中国东西部地貌边界带晚新生代构造变形历史与青藏高原东缘隆升过程初步研究[J].地学前缘,2003,10(4):599-612. |
| 作者姓名： | 张岳桥 杨农 陈文 马寅生 孟晖 |
| 作者单位： | 1. 中国地质科学院,地质力学研究所,北京,100081 2. 中国地质科学院,地质研究所,北京,100037 3. 中国地质环境监测总院,北京,100081 |
| 基金项目： | 国土资源部十五重点基础研究项目(20010202) |
| 摘 要： | 中国东西部地貌边界带横跨青藏高原东部与扬子地块,成为我国大陆Ⅰ级构造地貌陡变带和地球物理变异带。根据地表构造形迹的组合特征,地貌边界带由3个主要形变系统组成,从北到南它们是:东昆仑—岷山左旋走滑-冲断系统、龙门山—龙泉山冲断-推覆系统、鲜水河—安宁河左旋走滑-冲断系统等。在综合分析各构造系统的组成、变形特征、变形年代学和演化过程等基础上,提出了青藏东缘晚新生代阶段性构造演化模式。指出,晚中新世至早上新世时期,强烈的走滑-冲断变形主要发生在地貌边界带中南段,导致鲜水河—安宁河走滑-冲断系统和龙门山—龙泉山冲断-推覆系统的形成和发展,而东昆仑—秦岭断裂系则以走滑伸展变形为主,沿西秦岭构造带发育走滑拉分盆地和幔源火山喷发活动。晚上新世—早更新世时期,构造运动性质发生了南北反转,强烈的走滑挤压活动主要集中在北段东昆仑—岷山走滑-冲断系统,岷山隆起带在此时期强烈活动而快速崛起;青藏高原东南缘鲜水河—安宁河走滑断裂系统则以走滑伸展变形为主,在深切河谷中发育了昔格达河湖相沉积。中更新世以来,构造形变系统以挤压剪切为主,兼具正向倾滑活动,局部发生断陷作用。基于攀西地区深切河谷的构造地貌分析,提出了青藏东南缘晚新生代4-阶段隆升模式。 |
| 关 键 词： | 东西部地貌边界带 晚新生代 构造形变系统 高原隆升 |
| 文章编号： | 1005-2321(2003)04-0599-14 |
| 修稿时间： | 2003年5月10日 |
LATE CENOZOIC TECTONIC DEFORMATION HISTORY OF THE EAST-WEST GEOMORPHOLOGICAL BOUNDARY ZONE OF CHINA AND UPLIFT PROCESS OF THE EASTERN MARGIN OF THE TIBETAN PLATEAU |
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| ZHANG Yue-qiao,YANG Nong,CHEN Wen,MA Ying-sheng,MENG Hui Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing ,China.LATE CENOZOIC TECTONIC DEFORMATION HISTORY OF THE EAST-WEST GEOMORPHOLOGICAL BOUNDARY ZONE OF CHINA AND UPLIFT PROCESS OF THE EASTERN MARGIN OF THE TIBETAN PLATEAU[J].Earth Science Frontiers,2003,10(4):599-612. | |
| Authors: | ZHANG Yue-qiao YANG Nong CHEN Wen MA Ying-sheng MENG Hui Institute of Geomechanics Chinese Academy of Geological Sciences Beijing China |
| Institution: | ZHANG Yue-qiao,YANG Nong,CHEN Wen,MA Ying-sheng,MENG Hui Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China, Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China, China Institute of Geological Environment Measurement,Beijing 100081,China |
| Abstract: | The East-West geomorphological boundary zone of China straddles between the Tibetan plateau and Yangtze block and forms the first-order morphological and geophysical abnormal zone in the Chinese continent. According to a combination of surface structural elements, this geomorphological boundary zone consists of three main tectonic deformation systems, i. e. , the east Kunlun-west Qinling-Mins-han sinistral slip to thrusting fault system, the Longmenshan-Longquanshan thrust fault system, and the Xianshuihe-Anninghe sinistral-slip fault system. This paper analyses the basic features including the composition, the deformation characteristics and the geochronology of these deformation systems, and proposes a kinematic evolution model for the late Cenozoic tectonic history. It is pointed out that during the late Miocene and the early Pliocene, the strong shortening deformation mainly occurred along the middle to southern segments of the eastern Tibetan Plateau, which resulted in the formation and development of the Longmenshan-Longquanshan thrust fault system and the Xianshuihe-Anninghe sinistral-slip fault system. During this same period, the east Kunlun-west Qinling fault system was dominated by the transtensional deformation characterized by the formation of the pull-apart basins along the fault zone and by the local potassic alkaline ultramafic volcanic activities. The deformation style changed during the late Pliocene and the early Pleistocene and was dominated by the transpression along the east-Kunlun-west-Qinling-Minshan faulting system and by the transtension across the Xianshuihe-Anninghe faulting system. Since the middle Pleistocene, these deformation systems were active in a transtensional or transpressional setting, with local development of extensional basins. Based on morphostructural a-nalysis of deep-incised valleys in the Pan-Xi region, a 4-stage uplift model of this region has been proposed for the late Cenozoic plateau elevation history. |
| Keywords: | East-West geomorphological boundary zone of China late Cenozoic tectonic deformation system plateau uplift |
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