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Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan and Guangxi,China

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Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan an...

STUDY ON SEISMOGENIC PROBABILITIES OF POTENTIAL HYPOCENTER REGIONS IN THE CENTRAL QINGHAI-TIBET PLATEAU USING A TECTONOPHYSICAL METHOD

中国科学院地质与地球物理研究所2.01学术年会

作者： wu genyao {2. of {3. and Geophysics,Chinese academy of sciences,beijing 100029

Recent discoveries of ophiolites indicate that there must be a Palaeotethyan geosuture zone bordering China and Vietnam,which separates the Vietbac block from the South China *** Indosinian foreland fold-and-thrust belt bordering Yunnan and Guangxi provided further evidence for the *** oceanic crust was subducted southwestwards while the magmatic arc migrated northeastwards,and the continent-arc collision occurred in the Late Triassic with the thrusting being extended towards the north or *** features of thrust-nappe structure are discussed,which proved the continental margin of the Palaeotethyan ocean there to be a complicated one.A face-to-face collision occurred first along the NW-striking segment and then along the ENE-striking segment accompanied by transpression or oblique thrusting occurring along the NW-striking one.

关键词： thrust-nappe structure foreland fold-and-thrust belt palaeotethysides border between Yunnan and Guangxi

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地震地质 1993年第1期 13-20页

作者： Wang Shengzu(institute of geology, SSB,{2.)

A deterministic-cum-probabilistic tectonophysical method is used to estimate the hypocentral parameters and seismogenic probabilities of the potential hypocenter regions before and after the Nov. 5. 1988 earthquake (Ms =7) west of Tuotuoheyan in terms of the tectonic feature, stratigraphic structure, geoth-ermal environment, and driving background in the central Qinghai-Tibet plateau. As a result, the earth-quake risk tendency of this area is discussed.

关键词： Qinghai- Tibet plateau. Potential hypocenter region Seismogenic probability. Earthquake risk Tectonophysical method

The history of crustal uplift and metamorphic evolution of Panzhihua-Xichang micro-palaeoland, SW China:Constraints on Sm-Nd, ^(40)Ar/^(3.)Ar and FT ages of granulites

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Science China Earth sciences 2004年第8期47卷 689-703页

作者： XU Shijin1, LIU Wenzhong1, WANG Rucheng1, YU Hangbo1, LI Daming2. WAN Jinglin2.& FANG Zhong1 1. Department of Earth sciences and State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 2.0093. China 2. institute of {2., China Seismological Bureau, beijing 100029, China 1. Department of Earth sciences and State Key Laboratory for Mineral Deposits Research Nanjing University 210093 Nanjing China 2. institute of geology China Seismological Bureau 100029 Beijing China

Panzhihua-Xichang (Panxi) micro-palaeoland is the oldest terrane on the western margin of the Yangtze Block. Some intermediate-basic granulites are considered to be the crys-talline basement of lower crust in the terrane. Granulite-facies metamorphism of the granulites was developed in the period from 1186 Ma to 112. Ma. The origin of granulites was related to the collision orogenic process occurring when the micro-palaeolands merged to form the Rodinia Supercontinent. Amphibolite-facies retrogressive metamorphism of granulites took place in the period from 877 Ma to 82. Ma. This period was consistent with the breakup time of the Rodinia Supercontinent. 40Ar/3.Ar ages and fission track (FT) ages of granulites in the Panxi mi-cro-palaeoland show that the vertical movement history of crustal rocks was a slow uplift process of the rigid terrane in the time from Neoproterozoic to Mesozoic. The subduction of India Plate towards Euroasia Plate resulted in the rapid uplift of the Qinghai-Tibetan Block in Cenozoic. Meanwhile, the Qinghai-Tibetan Block moved towards east. Consequently the Panxi terrane was uplifted rapidly. As a result of the collision orogeny between the Qinghai-Tibetan Block and the Panxi terrane, the granulite-facies crystalline basement in this region was exhumed and exposed to the surface.

关键词： granulite,isotope geochronology,crustal uplift movement,Panzhihua-Xichang region,western margin of Yangtze Block.

CALCISPONGES AND HYDROZOANS FROM PERMIAN REEFS IN WESTERN GUANGXI

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古生物学报 2002年第3期 343-348页

作者： FAN Jia Song 1) , WANG Yu Mao 2. , and wu Ya Sheng 1) 1) institute of {2. and Geophysics, the Chinese academy of sciences, beijing 100029 2. The second geological team, Guangxi Bureau of {2. and Mineral Resources, Nanning 53.00

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关键词： Sphinctozoan Inozoan Hydrozoan reefs Permian Guangxi ChinaSummary The present paper describes briefly some general features of the Permian reefs exposed in Tianlin Lingyun and Fengshan counties where abundant framebuilding org

Mid-Holocene climate change in North China, and the effect on cultural development

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Chinese Science Bulletin 2002年第5期47卷 408-413页

作者： JIN Guiyun & LIU Dongsheng (LIU Tungsheng)institute of Cultural Relics and Archaeology of Shandong Province, Jinan 2.0012. China institute of {2. and Geophysics, Chinese academy of sciences, beijing 100029, China institute of Cultural Relics and Archaeology of Shandong Province Jinan China institute of geology and Geophysics Chinese Academy of Sciences Beijing China

In this study, to reconstruct the paleoclimatic history, pollen and oxygen isotope were analyzed on the 160 samples of a 2.7 m peat core from Taishizhuang, Huailai County, Hebei Province. Combining our data with other information of climate history and archaeology from this area, we found that there is a close linkage between cultural development and the mid-Holocene (6000-3.00 cal. aBP) environment changes. The main results and conclusions are presented as the following: The climate during 5678-5400 cal. aBP was unstable and in general colder and drier than today. From 5400 to 4800 cal. aBP the climate was much warmer and wetter than before. The climate during 4800-43.0 cal. aBP was persistently cold, with an exceptional cold event occurring at 4600-43.0 cal. aBP. This cold event was recorded at several other localities in Northern China even the Northern Hemisphere and played an important role in the cultural development. After the cold event, there was a return to warmer conditions between 42.0 and

关键词： North China peat mid-Holocene cold event cultural development.

A circum-earth shear zone at low-latitudes and episodic large earthquakes in it and the circum-Pacific seismic zone

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Science China Earth sciences 2006年第9期49卷 897-903页

作者： MA Zongjin1, DU Pinren1, REN Jinwei2.& GAO Xianglin1 1. institute of geology, China Earthquake Administration,{2., China 2. institute of Earthquake Science, China Earthquake Administration, beijing 10003., China 1. institute of geology China Earthquake Administration Beijing 100029 China 2. institute of Earthquake Science China Earthquake Administration Beijing 100036 China

Because of the differential motions between the Northern and Southern Hemispheres of the Earth, there exists a motion discordant zone between them. On the surface this zone consists of 13.large faults dominant with strike-slip. We call it a global shear zone at low-latitudes (E system). By statistical analysis of temporal distribution of earthquakes Mw≥7.5 in the E system and the circum-Pacific (P system) during 1900―2.03. we find that there exist quasi-episodic and alternative activities in and between these two systems. This phenomenon is likely associated with the half-sphere oscillation in dilation and contraction and the change of the Earth’s rotation rate.

关键词： shear zone, circum-Pacific zone, great earthquake, quasi-episode.

Paleotemperature changes over the past 3.00 years in eastern beijing, China: A reconstraction based on Mg/Sr records in a stalagmite

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Chinese Science Bulletin 2003年第4期48卷 395-400页

作者： MA Zhibang1, LI Hongchun2. XIA Ming1, KU Tehlung2. PENG Zicheng3. CHEN Yushu4 & ZHANG Zhaofeng3.1. institute of {3. and Geophysics, Chinese {2. of sciences, beijing 100029, China 2. Department of Earth sciences, University of Southern California, Los Angeles, CA90089-0740, USA 3. Department of Earth and Space Science, University of Science and Technology of China, Hefei 2.002., China 4. beijing Foshan Tourist Service Centre, beijing 1012.1, China institute of geology and Geophysics. Chinese {2. of {3. Beijing 100029 China

The Mg/Sr ratio in a stalagmite, which is di-rectly proportional to DMg/Ca, the solid-liquid distribution coefficient of Mg, is proposed as a geochemical thermometer to estimate paleotemperature changes. The paleotempera-ture change in eastern beijing over the past 3.00 years has been reconstructed by using this thermometer in the stalag-mite ZFFS-1 from Jingdong Cave. The records can be di-vided into two periods: 3.00—2.00 aBP, cool and wet, the air temperature averaging 9.8℃; and 2.00 aBP—present, hot and dry, the air temperature being 1℃ higher than the mean value (11.7℃) of the past 3.00 years. During 500—2.0 aBP, the air temperature was about 1.2. lower than that of the present, corresponding to the Little Ice Age in Europe. Like d 18O and d 13., Mg/Sr (or DMg/Ca) reflects an obviously warming trend of the past 2.0 years. These results are sup-ported by historic records.

关键词：北京京东溶洞石笋 Mg/Sr记录古气温测年 3.00年

KINEMATIC FEATURES OF TECTONIC DEFORMATION OF TERRANES IN THE XIZANG (TIBETAN) TETHYAN BELT

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地震地质 1992年第3期 204-214页

作者： Shen Xianjie(institute of geology,Academia Sinica,{2. {3.)

From the point of view of plate kinematics a unified convergence velocity model is employed to derive a series of kinematic equations for deformation of Himalaya and Lhasa-Gangdise terranes during the Himalayan *** equations describe terrane shortening,crust-upper mantle thickening,lateral strike-slip movement,plateau surface uplift,erosion planation and isostatic height of the crust,*** kinematic equations for terrane deformation derived on the basis of mass conservation define the macroscopic trends of tectonic evolution of 2.D deformation of the Himalaya Terrane and 3.D deformation of the Lhasa-Gangdise Terrane during the 40Ma of the Indian-Eurasian convergence-collision on the one hand,and provide the systematically defined initial and boundary conditions for further study on the process of tectono-thermal evolution of the deformed terranes on the other hand.

关键词： Tethyan Belt Terranes Tectonic deformation Plate kinematics Mass conservation Xizang

Garnet Sm-Nd and U-Pb systems: A case study of a granulite from the European Variscan belt

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Chinese Science Bulletin 2002年第15期47卷 1284-1288页

作者： CHEN FukunInstitut fur Mineralogie, Petrologie und Geochemie, Universitat Tubingen, 72.74 Tubingen, Germany institute of geology and Geophysics, Chinese {2. of sciences, beijing 100029, China Institut für Mineralogie Petrologie und Geochemie Universität Tübingen Tübingen Germany institute of geology and Geophysics Chinese Academy of Sciences Beijing China

This study presents zircon and garnet ages of a mafic granulite from the high-grade Variscan basement of the Black Forest, Germany and discuss isotope closure temperature of garnet Sm-Nd and U-Pb systems. Zircon grains yield 2.7Pb/2.6Pb ages between -3.0 and -414 Ma by the U-Pb and evaporation methods. In contract, garnet dating gives Sm-Nd and Pb-Pb isochron ages of (3.8±3. Ma and (411±14) Ma, respectively, which are older than most of zircon ages. These data imply that most of zircons lost radiogenic Pb, probably due to metamictization or recrystallisa-tion during the granulite-facies metamorphism (-800°C) at -3.0 Ma. Garnet Sm-Nd and U-Pb systems preserve chronological information of pro-grade metamorphism, probably profiting from a fluid-absence metamorphic environment. These results demonstrate that garnet mineral can be a better candidate than zircon mineral to date high-grade metamorphism by the U-Pb and Sm-Nd methods in some cases.

关键词： Variscan granulite garnet Sm-Nd U-Pb.