KINEMATICAL TRANSFORMATION AND SLIP PARTITIONING OF NORTHERN TO EASTERN ACTIVE BOUNDARY BELT OF SICHUAN-YUNNAN BLOCK
KINEMATICAL TRANSFORMATION AND SLIP PARTITIONING OF NORTHERN TO EASTERN ACTIVE BOUNDARY BELT OF SICHUAN-YUNNAN BLOCK
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发表时间：
2008
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通讯作者：
Chen Gui-hua
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作者：
Chen Gui-hua
青藏高原周边活动边界带的运动学定量求解是研究青藏高原演化的基础性研究。利用摄影测量技术和区域气候、地貌、构造的年代学分析方法，对川滇地块北东活动边界带沿着的主要断裂进行了定量的运动学研究。许多断层段局部存在中心对称倾滑，但以走滑为主。通过对川滇块体北东活动边界带及相关块体的区域系统进行矢量计算，以主要断裂运动学参数为基础，定量分析了纵向运动学转换和横向滑动划分。从这些资料可以看出，贡嘎山地区存在着一条以6.2mm/a的垂直隆升速率分布的形变带，沿安宁河流域东部阶地内侧存在着一条以沿着1.45mm/a的倾滑断层。建立了川滇块体东北角和东带的定量滑动分离模型。建立了由川滇块体北东向活动边界带及相关块体组成的区域体系的定量运动学模型。
It is a fundamental study for the research of evolution of Qinghai-Tibetan Plateau to resolve the kinematics of active boundary belt around the plateau quantitatively. With the measuring technology of photogrammetry and chronological method of analysis among regional climate,geomorphology and tectonics,we get a set of quantitative kinematical data for the main faults along the northern-eastern active boundary belt of Sichuan-Yunnan block. There were centre-symmetrical dip-slips locally in many fault segments while they were mainly strike-slip. With vector computation within a regional system including the north-east active boundary belt of Sichuan-Yunnan block and related blocks,we analyzed the longitudinal kinematical transformation and transversal slip partitioning quantitatively based on the parameters of main faults kinematics. From these data,there were a vertical uplift rate of 6.2mm/a in the Gonggashan area in distributed deformation form,and a mainly dip-slip fault at least with a rate of 1.45mm/a along the inner side of eastern terrace of Anninghe valley. We set up quantitative slip partitioning models for the northeast corner and eastern belt of Sichuan-Yunnan block. A quantitative kinematical model is set up for the regional system which consists of the northern-eastern active boundary belt of Sichuan-Yunnan block and related blocks.