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A Comparison about Metamorphism among the Oldest-Rock Units from Orogenic Belts of Dabie,Eastern Qinling and Eastern Kunlun of Central Mountain Ranges,china

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Journal of earth Science 1998年第3期17卷 10-15页

作者： Chen Nengsong Zhang Kexin Wang Guocan Hou Guangjiu Zhu Yunhai Faculty of earth Sciences, china University of Geosciences, {2. 4.0074

The Dabie orogen, Eastern Qinling orogen and Eastern Kunlun orogen are the major components of the Central Mountain Ranges of china and each has distinctively metamorphic processes in their oldest rock units. The Dabie orogen oldest rock units had experienced an intermediate-higher pressure, upper amphibolite to lower granulite facies metamorphism in the Indosinian intracontinental subduction collision event. The clockwise pt path, synchronous attainment of t max and p max and a segment of high slope retrograde path suggest a tectono driven rapid exhumation of the oldest rock units to upper middle crustal level following the end of the subduction collision process. The oldest rock units, also called Qinling Group, of Eastern Qinling Mountains suffered intensively collisional metamorphism at an immature plate tectonic framework during Jinningian {2. about 1 000 Ma ago. The clockwise pt path with reach of t max following several hundreds of MPa decreasing from p max suggests that the denudation of the deeply burial rock units was due essentially to isostatic relaxation. During the Caledonian stage, the highly metamorphosed oldest rock units suffered from a high t thermal event in arc environment and superimposed by contact metamorphism. After thermal peaks, the rock units were exhumed in a short distance and cooled down isobarically. No regional metamorphism higher than upper greenschist facies condition since 300 Ma has been traced within exposed rocks in the eastern portion of Northern Qinling orogen. The oldest rock units in the Eastern Kunlun orogen were metamorphosed to upper amphibolite facies to lower granulite facies rocks early or during the Luliang {2. (some 1 800 Ma ago). The high grade metamorphic rock units had a long resident time at the deep crustal level, and were exhumed to middle upper crustal level during the Caledonian to Hercynian tectonometamorphic events. Shallow erosion of

关键词： the oldest metamorphic rock units pt path geodynamics of metamorphism Dabie orogen Eastern Qinling orogen Eastern Kunlun orogen Central Mountain Ranges of china.

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沪蓉高速公路西段线路工程地质遥感解译

山地学报 2004年第3期22卷 352-356页

作者：刘玉山王红明邓长青湖北省交通规划设计院湖北省交通规划设计院湖北武汉　4.0051中国地质大学湖北武汉　4.0074 湖北武汉　4.0051

沪蓉高速公路西段路线走廊带是我国西南喀斯特生态环境脆弱区,喀斯特发育,存在一些重要的不良地质现象,如喀斯特地面塌陷和滑坡。该区在长期地壳运动发展中,不同时期、不同规模、不同方向的断裂构造体随时间、空间(构造位置及边界条件)... 详细信息

沪蓉高速公路西段路线走廊带是我国西南喀斯特生态环境脆弱区,喀斯特发育,存在一些重要的不良地质现象,如喀斯特地面塌陷和滑坡。该区在长期地壳运动发展中,不同时期、不同规模、不同方向的断裂构造体随时间、空间(构造位置及边界条件)和构造运动方式的变化,在各种地应力场的作用下形成了不同性质、不同规模等级的线性构造形迹。在沪蓉高速公路西段勘察中,利用空间图像的光谱特征和几何图形特征,探讨遥感解译过程中对各类线性构造分布及其特征的识别、判别工作方法与流程。

关键词：沪蓉国道遥感解译公路工程地质工作流程

基于GPS的青藏块体东北缘现今地壳水平运动研究

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山地学报 2005年第3期23卷 260-266页

作者：李天文梁伟锋李军锋龙永清王庆良崔笃信西北大学大陆动力学教育部重点实验室中国地震局第二监测中心西北大学城市与资源学系中国地震局第二监测中心陕西西安710069西北大学城市与资源学系陕西西安710069 陕西西安710054

以“中国地壳运动网络观测”工程1999~2.01年GPS观测数据为基础,应用GAMIT/GLOBK软件对数据进行精密解算,获得了青藏块体东北缘1999~2.01年相对于欧亚板块的水平运动速度场。结合板块构造和大地动力学理论,分析了该地区地壳水平运动特征... 详细信息

以“中国地壳运动网络观测”工程1999~2.01年GPS观测数据为基础,应用GAMIT/GLOBK软件对数据进行精密解算,获得了青藏块体东北缘1999~2.01年相对于欧亚板块的水平运动速度场。结合板块构造和大地动力学理论,分析了该地区地壳水平运动特征,主要得出了以下结论:①青藏块体地壳运动的东北边界应为海原断裂带和祁连山北缘断裂带;②甘青块体西侧子块体以北东向运动挤压和地壳缩短为主,东部子块体以整体顺时针旋转为主;③鄂尔多斯块体可能存在逆时针旋转运动,其旋转速度在块体西南侧的六盘山断裂处一带最大,向北至块体西北部明显减小。

关键词：青藏块体东北缘地壳水平运动 GPS

Lithospheric Stretching,Subsidence and Thermal History Modeling: Application to Yinggehai,Qiongdongnan and Songliao Basins in East china

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Journal of earth Science 1997年第1期16卷 83-89页

作者： Lin ChangsongDepartment of Energy Resources, china University of Geosciences, Beijing 100083Li SitianFaculty of earth Resources, china University of Geosciences, wuhan 4.0074.Zhang QiminWest Nanhai Oil Company, Zhanjiang 5{4.000Zhang

he lithosphere stretching, subsidence and basement thermal history of the Songliao, Yinggehai and Qiongdongnan basins in East china have been investigated by using backstripping technique and stretching models. The subsidence curve of the Songliao basin characterizes a rift basin history evolving from synrift rapid subsidence to postrift thermal subsidence. The calculated stretching factor of the basin is about 1.8 to 2.0 and the horizontal extension is about 55-60 km. The reconstructed subsidence curves of the Qiongdongnan and Yinggehai basins show that the basins underwent several rapid subsidence episodes, which has been interpreted as the result of a multiple stretching of the lithosphere. The total mean stretching factors of the Qiongdongnan and Yinggehai basins, calculated by using a multiple instantaneous stretching model, are about 1.7-1.9 and 2.5-3.0 respectively. The stretching factors of these basins, estimated from subsidence, are consistent with those determined from crustal thinning. The reconstructed thermal histories of these basins are in agreement with the geological {2..

关键词： subsidence stretching Mesozoic rift basin East china.

黔东南凯里-榕江-从江前寒武系甚低级变质作用研究

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岩石学报 2018年第3期34卷 669-684页

作者：安佳丽王河锦苑蕾造山带与地壳演化教育部重点实验室北京100871 北京大学地球与空间科学学院北京100871

根据碎屑岩甚低级变质作用原理,运用伊利石结晶度、绿泥石结晶度、伊利石-白云母多型、伊利石(白云母)b_0值、绿泥石温度计等碎屑岩低温变质研究的方法,分析研究了黔东南前寒武系67个<2.m的粘土样品,得到黔东南凯里-榕江-从江一带下江... 详细信息

根据碎屑岩甚低级变质作用原理,运用伊利石结晶度、绿泥石结晶度、伊利石-白云母多型、伊利石(白云母)b_0值、绿泥石温度计等碎屑岩低温变质研究的方法,分析研究了黔东南前寒武系67个2.m的粘土样品,得到黔东南凯里-榕江-从江一带下江群伊利石结晶度为0.2.1~0.607°Δ2.Cu Kα、绿泥石结晶度为0.2.9~1.393°Δ2.Cu Kα,变质带伊利石-白云母多型均为2._1型,伊利石(白云母)b_0值为0.9001~0.904.nm,平均0.902.nm。根据伊利石(白云母)b_0值的累积频率曲线得出研究区下江群遭受的变质作用为典型的中压变质类型。由Cathelineau(1988)绿泥石温度计估算出下江群浅变质带峰期变质温度为362.382.。以上结果表明凯里-榕江-从江一带下江群经历了成岩-高近变质-浅变质作用,基于Warr和Rice标样的成岩/变质界限,剖面可划分为一个成岩带、两个近变质带、一个转变带和一个浅变质带。结合华南地区新元古代构造运动,推断新元古界下江群经历的成岩-变质作用与晋宁运动引起的扬子地块与华夏地块碰撞拼贴有关。

关键词：结晶度伊利石-白云母多型伊利石(白云母)b0值成岩作用变质作用前寒武系黔东南

Deformation and 4.Ar/39Ar thermochronology on the mylonites from south Tan-Lu fault:The geological significance

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Deformation and 40Ar/39Ar thermochronology on the mylonites ...

THE UPWARPING AND DOWNWARPING STRUCTURAL SYSTEM OF MOHO—SURFACE IN CHINESE AND NEAR REGION AND THE GENETIC MECHANICS OF QINGHAI—TIBET PLATEAU TECTONIC

第九届全国固体核径迹学术研讨会

作者： X.Y.YANG~(1,2. 1.CAS Key Laboratory of Crust-Mantle Materials and Environments,School of earth and Space Sciences,University Science and Technology of china,Hefei 2.002.,{2. 2.CAS Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Guangzhou,51064.,{2.

Tan-Lu fault belt is an important deep fault belt in east china and Asian continent,and its southern part is the key part for geology,where the series of mylonites were developed in the ductile shear zones since its shifting *** plastic deformation is commonly occurring in the *** deformed biotite and feldspar may record the chronological information since the period of deformation,the age from the deformed minerals may represent the important period of the history of deformation and even the shifting movement of the fault *** and plagioclase samples separated from the mylonite samples were determined by 4.Ar/39Ar fast neutron activation *** the basis of the deformed minerals with microscope and TEM {2.,the stop-heating technique is hired here for determination of Ar/Ar *** ages from single minerals were obtained with the plateau ages of and isoclines ages of 98.4.± 0.32.a-113.89±0.31Ma and 98.80±0.19Ma-113.99±0.2.Ma,*** two types of Ar/Ar thermochronology ages are well consistent,so that the convinced deformed ages are supposed to be 98Ma-114.*** 4.Ar/39Ar thermochronology ages may represent the cooling ages of the shifting movement of Tan-Lu fault belt.

关键词： ductile shear zones plastic deformation mlonites 4.Ar/39Ardating Tan-Lu fault belt

来源： cnki会议评论

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地学前缘 2000年第S1期7卷 366-367页

作者： Zhang Jingfa,Tang Rongyu,Chen Xuebo,Wang Enfu,Li Jingshen[WT5,5”BX] (Institute of crustal Stress,SSB,Beijing 100085,china)

Recently, this study group established “the map of MOHO\|surface bathymetric line in Chinese and Near Region" on the basis of latest survey and study of the crustal depth, the preliminary result shows that the regular meridional and latitudinal upwarping and downwarping structural pattern of MOHO\|surface bathymetric line among Eurasian plate and Pacific plate and the Indian plate alternately appears, and which is accreted and coupled with basin ridge structure that exist shallow crustal base, continental crust and oceanic crust and others regular upwarping and downwarping net structure system that possessing different block characters and different scales exist together. Among different structure systems, it occurs that ramp downwarping impetus transform structure belts whose trends is characteristic. Nowadays upwarping and downwarping net structure system is basically modeled in Himalayan orogeny period. It is showed that the {2. revolution way has been changed in this period, which leaded to a new {2. dynamics *** pattern of upwarping and downwarping structure among different structure systems or different structure blocks , and the characters of different trends and different scale transform structure belts, reflects the structure {4. way and their conversion law, and reveals the {2. centralized dynamics mechanics that is produced by the revolutionary effect under the environments of aster system. This can be clearly reflected by the change of impetus way between Qinghai—Tibet highland structure system and near structure system.

关键词： Moho\|surface structural system genetic mechanics tectonic Qin ghai—Tibet

Holocene Paleoseismic Activity Along the Northern Piedmont Fault of the Hengshan Mountain, South of Datong Basin in Shanxi Province

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earthquake Research in china 2003年第3期17卷 206-219页

作者： Jiang Wali, Xie Xinsheng, Wang Huanzhen, Feng Xiying and Zhang KangfuInstitute of crustal Dynamics, china Seismological Bureau, Beijing 100085, china Institute of crustal Dynamics China Seismological Bureau Beijing 100085 China

Our field investigation indicates that the northern piedmont fault of the Hengshan Mountain has dislocated proluvial fan and terrace I of the gully mouth on the northern border of the Hengshan Mountain. Stratigraphic age data indicates that the surface layer in the middle and rear part of the proluvial fan and on the terrace I of the gully mouth on the mountain border consists of sediments of about 52.0～6800a B.P. The Hezhuang and Niucaoyu trenches excavated in the front of Hengshan Mountain revealed that 3 paleoseismic events have occurred along the northern piedmont fault of Hengshan Mountain since the early Holocene. The 3 paleoseismic events occurred in 2.60±190～4.70±150a BP, nearly 562.±150a BP, and 8083±2.0～84.0±72.a BP, respectively, and their recurrence interval is 2.13a,2.2.a and 2.71a on average. The coseismic vertical displacement produced by these events is 1 0～3 0m. The elapsed time of the latest movement along the fault has exceeded the recurrence interval of these paleoearthquakes. Thus, there exists the possibility of strong earthquake occurrence along the fault from now onward, so the fault is in need of observation.

关键词： Trenching Paleoearthquake Holocene Northern Hengshan piedmont fault

A Preliminary Research on the Application of GPS to Regional crustal movement and Judgement of Seismic Risk Region

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earthquake Research in china 1998年第3期12卷 49-56页

作者： Yang Guohua, Li Yanxing, Bo Wanju, and Han YuepingThe First crustal Deformation Monitoring Center, china Seismological Bureau, Tianjin 300180, china

We analyzed the present state of crustal horizontal movement in part of the North{2. region using existing GPS re-observation data (1992.1995) and drew the following conclusions: (1) The monitored region appears to be in tensile movement, with the trend of the principal tensile strain in the WNW-ESE direction; (2. There are two zones of higher maximum shear strain in the monitored region, namely, the Beijing zone and two sides of the Tancheng-Lujiang fault near Linyi; (3) There exists a striped compressive zone which stretches in the NNE-SSW direction; the zone of maximum planar compression is located in the Beijing zone; (4. The displacement field has an obvious zoned distribution.

关键词： GPS survey North china region crustal horizontal movement earthquake.