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The Major Two-stage Shortening Deformation of the northern tibet and Tian Shan Area Since the Latest Oligocene

Acta Geologica Sinica(English Edition) 2015年第5期89卷 1546-1560页

作者： LU Haijian LI Haibing LIU Dongliang State Key Laboratory of Continental Tectonics and Dynamics Institute of Geology Chinese Academy of Geological Sciences

It seems to be progressively recognized that the stress of the India-Asia convergent front can be transferred rapidly through the southern and central tibetan lithosphere to the northern tibet, hence leading to the crustal thickening deformation there during or immediately after the onset of the India-Asia collision（ca.55 Ma）.This study focuses on the late Cenozoic deformation and tectonic uplift of the northern tibet and Tian Shan *** compilations of a variety of proxy data from sediments and bedrocks suggest that the northern tibet and Tian Shan area underwent one stage of approximately synchronous widespread contractile deformation since 25–20 Ma, which seemed to decrease at circa 18 Ma as revealed by low-temperature thermochronological *** latest Oligocene-early Miocene was also significant basin-forming episodes when many intermontane subbasins began to receive syntectonic sedimentation in the northeastern ***, the other phase of compressional deformation began to encroach more widely into the northern tibet and Tian Shan area in episodic steps or continuously from 16–12 Ma to present.

关键词： shortening deformation the northern tibet the Tian Shan area the latest Oligocene

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Discovery of the Surface Rupture Zone on the South of Helishan in Gaotai,Gansu Province

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Earthquake Research in China 2010年第1期24卷 97-105页

作者： Zheng Wenjun Zhang Peizhen Yuan Daoyang Ge Weipeng Liu Jianhui State Key Laboratory of Earthquake Dynamics Institute of Geology CEA Beijing 100029 China Lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China

According to a new investigation in the northern Hexi corridor,the remains of two surface rupture zones were discovered on the southern margin fault of the Helishan. One rupture has a length of approximately 7km and the other 10km. The two surface rupture zones might have been produced by the latest earthquake event. On the surface rupture is continuous scarp and free face caused by the rupture. The scarp is about 1 ～ 1. 5m high and on some sites,nearly up to 2m. According to the OSL results,the latest T1 terrace and higher flood plain forming in 3000a B. P. are dislocated by the fault. The above reveals the rupture age to be later than the T1 terrace. However,in the historical data and earthquake catalogue,we didn't find related information about the fault and surface rupture in this area. The 180 A. D. Biaoshi M8. 0 earthquake and the 756 A. D. Zhangye-Jiuquan M7. 0 earthquake are documented in historical data. It is inferred by textual research that the two earthquakes are related to the northern marginal fault of Yumushan in the south of the basin. Due to a lack of reliable evidence,there are still many arguments on this inferred conclusion. Thus we hold that the two surface rupture zones were produced by one of the two large earthquakes or other unrecorded historical event. The research on the activity and surface rupture of this fault can offer valuable information for the tectonic study and strong earthquake risk estimates of this region in the future.

关键词： Surface rupture The Helishan southern margin fault the northern tibet Gaotai, Gansu

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青藏高原高寒牧区聚落时空演化及驱动机制

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地理 2020年第1期

作者：张海朋樊杰何仁伟刘汉初

以青藏高原北部牧区那曲县为研究对象，基于多时相高清遥感影像精确提取的2005、2010和2017年3期聚落斑块数据，综合运用GIS分析技术定量测度了那曲县聚落演化的总体特征和空间指向特性，并进一步探讨了聚落格局及演化的驱动机制。结果... 详细信息

以青藏高原北部牧区那曲县为研究对象，基于多时相高清遥感影像精确提取的2005、2010和2017年3期聚落斑块数据，综合运用GIS分析技术定量测度了那曲县聚落演化的总体特征和空间指向特性，并进一步探讨了聚落格局及演化的驱动机制。结果表明：①2005-2017年，那曲县聚落规模和密度均呈增大态势，由数量增长型扩张转变为规模增大型扩张；聚落形态演变表现出阶段性差异，由空间无序向规整有序转变；聚落以小型为主，面积小于1hm[2]的斑块数占比高达69％，在时间演化上小聚落向大、中型聚落晋级趋势明显；聚落规模空间相关性显著，大斑块集聚区以县城所在地为中心沿青藏公路向西南方向延伸，小斑块集聚区长期围绕那曲镇外围呈“环形”分布。②特殊的自然本底塑造了那曲县聚落低山缓坡趋向和亲水近路特征，受生存环境和生计方式影响，聚落布局呈现避灾特性，聚落演化的优质草场指向性明显，随着高原乡镇经济职能的日益强化，聚落演化逐渐呈现出与内陆城镇化地区类似的乡镇中心地指向。③高海拔、破碎地貌、自然灾害多发易发、草场禀赋差异及水系纵横等自然环境因素塑造了那曲县聚落大范围小规模沿河谷阶地零散分布的基本格局，而政策、市场化与人口增长、区位条件、管理制度及文化观念等社会人文因素是推动聚落演化的主要动力。

关键词：青藏高原高寒牧区聚落那曲县藏北地区 tibetan Plateau alpine pastoral area settlements Nagqu County the northern tibet

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