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On the siltation of the middle Yangtze River

Science china Earth Sciences 2004年第5期47卷 463-480页

作者： YIN Hongfu1, CHEN Guojin2. LI Chang抋n1 & WEI Yuan3.1. School of Earth Sciences, china University of Geosciences, Wuhan 43.074, china {2., hubei bureau of geology and Mineral resources, jingzhou 43.100, china 3. Geological Survey of Jiangxi Province, Nanchang 3.02.1, china School of Earth Sciences China University of Geosciences Wuhan 430074 China hydrogeological team Hubei Bureau of Geol./Mineral Rsrc. Jingzhou 434100 China Geological Survey of Jiangxi Prov. Nanchang 330201 China

About 5.2.108 t/a of silts from the upper reach of the Yangtze River are transported through Yichang into the middle Yangtze River. The middle Yangtze itself and its tributaries yield ca. 0.8×108 t silts annually. Of this total 6×108 t/a input of silts, ca. 1.2.108 t/a are deposited within the river artery and lakes, while ca 4.83.108 t/a are at first transported into the lower reach through Datong, and then either deposited along the river and the Yangtze Delta, or output into the sea. Along the middle Yangtze River silting generally exceeds scouring, but the spatial and temporal distributions of scour-and-fill, as well as its distribution in the river valley transections, are uneven. Along the Yichang-Chenglingji and Jiujiang-Datong Segments of the middle Yangtze, scouring exceeds or equals silting. Silting mainly occurs along the Luoshan-Wuhan-Huangshi Segments with Wuhan as the pivotal point, as well as in the Dongting and Poyang Lakes. Even in these silting-dominated areas, there are times and parts of segments that scouring prevails. As to the transections, generally the river channel of main stream is scouring-dominated, forming V-shaped sections to a depth of 2.3. m or more, whereas the floodplains and bar islands are silting-dominated, forming wide and relatively high flats, which are often artificially transformed into protected embankments. Because the Jingjiang Levee separates the Jianghan Plain from Yangtze to the south, little has been deposited in that plain except a few sediments from the Han River—a tributary of the middle Yangtze. This factor plus the tectonic sag of that plain has made the altitude of plain surface several meters lower than that of the levee in most of the areas. Sil-tation along the Luoshan-Wuhan-Huangshi Segments has resulted in the elevation of flood level in this and upstream segments. River channel scouring plus floodplain silting have caused the transections of the middle Yangtze valley typically with deep channel and height

关键词： the middle Yangtze, scour-and-fill, siltation, silt utilization.

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Discovery of Cu-Zn,Cu-Sn intermetallic minerals and its significance for genesis of the Mianning-Dechang REE Metallogenic Belt,Sichuan Province,china

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Science china Earth Sciences 2006年第6期49卷 597-603页

作者： XIE Yuling1, HOU Zengqian2. XU Jiuhua1, YUAN Zhongxin2. BAI Ge2.& LI Xiaoyu3.1. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083.{3. 2. Institute of geology, Chinese Academy of Geological Sciences, Beijing 10003.,{3. 3. The 109th Geological team, Sichuan bureau of Mineral Exploration, Chengdu 610100,{3. Civil and Environmental Engineering School University of Science and Technology Beijing Beijing China Institute of geology Chinese Academy of Geological Sciences Beijing China The 109th Geological team Sichuan Bureau of Mineral Exploration Chengdu China

Mianning-Dechang Himalayan REE Metallogenetic Belt in Sichuan Province lies along the western margin of the Yangtze Craton. We have conducted detailed mineralogical studies on ore minerals collected from Maoniuping and Dalucao, the two largest deposits in the belt. With optical microscope, SEM/EDS, and EPMA, three rare intermetallic minerals, i.e., zinccopperite (Cu2.n), Sn- bearing native copper, and Cu-bearing jupiter were found to occur in the main ore along with barite, fluorite, apatite, sulfide and bastnaesite. Since the conditions under which zinccopperite and Sn- bearing native copper formed are quite unique, finding of these minerals, for the first time in domestic REE deposits, has significant implications for the genesis of the ore deposits in which they occur. In comparison with Cu-Zn intermetallic minerals in other occurrences, we propose that the formation of this REE metallogenetic belt is associated with fast upwelling of the Himalayan magma from deep source.

关键词： Mianning-Dechang REE metallogenetic belt, Cu-bearing intermetallic minerals, EPMA, genesis significance, deep source magmatic activity.

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Ancient Changjiang channel system in the East china Sea continental shelf during the last glaciation

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Science china Earth Sciences 2005年第11期48卷 1972-1978页

作者： LI Guangxue1,2. LIU Yong1, YANG Zigeng3. YUE Shuhong4, YANG Wenda5 & HAN Xibin1 1. College of Marine Geo-science, Ocean University of china, Qingdao 2.6003. china 2. Shandong Key Laboratory of Sea Floor Resource and Exploration Technique, Qingdao 2.6003. china 3. Qingdao Institute of Marine geology, Qingdao 2.6071, china 4. College of Marine Environment, Ocean University of china, Qingdao 2.6003. china 5. First Survey {13. of Marine geology, Shanghai bureau of Petroleum, Shanghai 2.12.8, china College of Marine Geo-science Ocean University of China Qingdao China Shandong Key Laboratory of Sea Floor Resource and Exploration Technique Qingdao China Qingdao Institute of Marine geology Qingdao China College of Marine Environment Ocean University of China Qingdao China First Survey team of Marine geology Shanghai Bureau of Petroleum Shanghai China

Based on the data of high-resolution seismic profiles, an ancient river channel sys-tem of the last glaciation occurred along the Zhedong and Xihu depression in the southeast of Hupijiao rise. The distribution of the channel fill system shows that the ancient Changjiang River went through the Changjiang depression into the low land plain of the outside continental shelf during the low sea level cycle of the last glaciation. The big channel fill into Okinawa Trough is not found due to the depletion of the river kinetic energy in the low land plain. The river discharge dispersal was of an important role to the dilution of the northern Okinawa Trough sea at that time. Six ancient river channel systems (A―F), which are main distributaries of ancient Changjiang in the East china Sea continental shelf during the last glaciation, may be buried off the modern Changjiang estuary. The distribution of these channels coincides with the zonal elevations in the sea floor.

关键词： last glaciation, continental shelf plain, Changjiang River, ancient channel fill

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Geochemical characteristics of the independent cadmium deposit, Niujiaotang, Duyun, Guizhou

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Chinese Science Bulletin 1999年第S2期44卷 61-63页

作者： LIU Tiegeng~1, YE Lin~1 and CHEN Guoyong~2.1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002. china 2. team No. 104, {2. of geology and Mineral resources, Duyun, Guizhou 558000, china Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China team No. 104 Bureau of Geology and Mineral Resources Duyun Guizhou 558000 China

A large independent cadmium deposit has been found at Niujiaotang, Duyun, in recent years. To the bestof our knowledge this represents the first case of its kind in the world. With a reserve of over 5 000 tonsof cadmium, the deposit is unique in its high concentrations of cadmium which are tens of to over onehundred times higher than in ordinary cadmium mineralizations associated with Pb-Zn deposits. 1 Geological characteristics The Niujiaotang deposit is located at the southwest margin of the Yangtze Plate. The region consistsof a thick sedimentary cover ranging from Sinian to Triassic in age overlying unconformably the basementof Mid-Proterozoic metamorphosed volcanic-sedimentary rocks. Lower Cambrian carbonate strata arcoutcropped in the mining district. Cadmium mineralizations, with seven layers recognizable, are devel-

关键词： independent cadmium deposit mode of occurrence of cadmium inclusion fluid feature stable isotope geochemistry.

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Timing and geochemical characters of the Sanchazi magmatic arc in Mianlüe tectonic zone,South Qinling

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Science china Earth Sciences 2004年第4期47卷 317-328页

作者： LI Shuguang1, HOU Zhenhui1, YANG Yongcheng2. SUN Weidong1,1), ZHANG Guowei3. & LI Qiuli1 1. School of Earth and Space Sciences,University of Science and Technology of china ,Hefei 2.002.,china 2. Regional Geological Survey {2. of Shaanxi Province,Xianyang 712.00, china 3. Department of geology, Northwest University,Xi抋n 710069, china School of Earth and Space Sciences University of Science and Technology of China Hefei China Regional Geological Survey team of Shaanxi Province Xianyang China Max-Planck-Institut f. Chemie Mainz Germany Department of geology Northwest University Xi’an China

The Sanchazi mafic-ultramafic complex in Mianlüe tectonic zone,South Qinling can be subdivided into two blocks,*** paleo-magmatic arc and Zhuangkegou paleo-oceanic crust fragment (ophiolite).The Sanchazi paleo-magmatic arc is mainly composed of ande-site,basaltic and basalt-andesitic gabbro(or diorite),andesitic dyke,plagiogranite and minor ul-tramafric rocks,which have typical geochemical features of island arc volcanic rocks,such as high field strength element(***,Ti)depletions and lower Cr,Ni *** Light rare earth element (LREE) and K enrichments of these rocks and zircon xenocrystals of 900 Ma from plagiogranite suggest that this magmatic arc was developed on the South active continental margin of the South Qinling *** U-Pb age of (3.0±61) Ma for zircons from plagiogranite in-dicates that the Mianlüe paleo-oceanic crust was probably subducted underneath the South Qinling micro-continent in *** is consistent with the formation time (3.9Ma) of the Huwan eclogite originating form oceanic subduction in Dabie Mountains,suggesting that the Mianlüe paleo-ocean probably extended eastward to the Dabie Mountains in *** high-Mg adakitic rocks in Sanchazi paleo-magmatic arc suggest thet the subducted oceanic crust was relatively young (2.Ma) and hot.

关键词： Qinling orogen, magmatic arc, U-Pb zircon age, ophiolite complex.

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Mammal-bearing Pleistocene deposits,Vranic,southwestern Pannonian Basin System

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Journal of Palaeogeography 2024年第3期13卷 430-452页

作者： Adriano Banak Zsòfia Ruszkiczay-Rüdiger Anita Grizelj Martina Đuras Kresimir Petrinjak ASTER team Alexander Wieser Monika Milosevic Davor Pavelic Department of geology Croatian Geological SurveyMilana Sachsa 2HR-10000 ZagrebCroatia Institute for Geological and Geochemical Research HUN-REN Research Centre for Astronomy and Earth Sciences(MTA Centre of Excellence)Budaorsi Street 451112 BudapestHungary The Faculty of Veterinary Medicine University of ZagrebHeinzelova 55HR-10000 ZagrebCroatia CEREGE CNRS-IRD-College de France-INRAE UM34Aix-Marseille UniversiteAix-en-ProvenceFrance Faculty of Physics-Isotope Physics University of ViennaWahringer Straße 171090 ViennaAustria Faculty of Mining Geology and Petroleum EngineeringUniversity of ZagrebPierottijeva 6HR-10000 ZagrebCroatia

Vranic site is a sand quarry that is located on the southern foothills of Papuk *** bottom to top of the succession,three sedimentary units have been recognized as:Unit 1 containing massive sand with scattered gravel-sized clasts,marl cobbles and boulders,and abundant marine mammal and fish fossils;Unit 2.consisting of sand intercalated with silt,clay and gravel,which may be horizontally bedded;and Unit 3.which is an erosionally-based lenticular matrix to clast-supported structureless *** basal part of Unit 1 shows numerous reworked skeletal remains of Miocene marine *** radionuclides constrain the age of burial of Unit 1 to 895±2.1 ka,while the source area of Unit 1 had a quick *** massive sands deposited on the slopes of Papuk Mountain were vulnerable to erosion due to the absence of *** rainfall or water from snow melting created flash floods that infiltrated the sands,thereby causing slope destabilization and *** process led to slumps that were transformed into a sandy debris *** sediment was probably deposited during the interglacial marine isotope age(MIS)2. period when the scarce vegetation and a warmer climate favored the melting of permafrost ice and consequently triggered slope movements during MIS *** reworked skeletal material sampled at the Vranic site comprises fossilized fish along with mammal bones and ***,the Vranic site represents an important site for cetacean fossil remains and serves as an important data source for marine life in the Central Paratethys.

关键词： Miocene marine mammals Alluvial slope deposit Pleistocene Cosmogenic nuclides Pannonian Basin System

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FURTHER STUDY ON OSTRACODES FROM THE TAIYUAN FORMATION OF XINGYANG, GONGXIAN AREA, HENAN

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微体古生物学报 1991年第1期 79-87页

作者： Zhang Xiao-jun (Geological Research Party, North china bureau of Patroleum {2., Zhengzhou 450007) Liang Xiang-yuan (The 3.d Cool {2. team of Henan, Xinxiang 453.03.

The ostracodes were collected from the Taiyuan Formation of Xingyang, Gongxian area ,Henan. They comprise 3. species in 2. genera, of which 13.species in 7 genera are reported for the first time from china and 8 species in 2.genera are identified as planktonic elements. The discovery of planktonic ostracodes from the Taiyuan Formation is important for the reconstruction of palaeogeography and sedimentary history in this area during the

关键词： view GONGXIAN AREA HENAN FURTHER STUDY ON OSTRACODES FROM THE TAIYUAN FORMATION OF XINGYANG

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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 geology and Geophysics, the Chinese Academy of Sciences, Beijing 10002. 2. The second geological team, Guangxi {2. of geology and Mineral resources, Nanning 53.00

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ＳｕｍｍａｒｙＴｈｅｐｒｅｓｅｎｔｐａｐｅｒｄｅｓｃｒｉｂｅｓｂｒｉｅｆｌｙｓｏｍｅｇｅｎｅｒａｌｆｅａｔｕｒｅｓｏｆｔｈｅＰｅｒｍｉａｎｒｅｅｆｓｅｘｐｏｓｅｄｉｎＴｉａｎｌｉｎ ,ＬｉｎｇｙｕｎａｎｄＦｅｎｇｓｈａｎｃｏｕｎｔｉｅｓ,Ｇｕａｎｇｘｉ,ｗｈｅｒｅａｂｕｎｄａｎｔｆｒａｍｅｂｕｉｌｄｉｎｇｏｒｇａｎｉｓｍｓｉｎｃｌｕｄｉｎｇｃａｌｃｉｓｐｏｎｇｅｓ,ｈｙｄｒｏｚｏａｎｓａｎｄｏｔｈｅｒｓａｒｅｗｅｌｌｐｒｅｓｅｒｖｅｄ .7ｇｅｎｅｒａｏｆｓｐｈｉｎｃｔｏｚｏａｎｓｐｏｎｇｅｓ,3.ｅｎｅｒａｏｆｉｎｏｚｏａｎｓｐｏｎｇｅｓ ,ｏｎｅ“ｈｙｄｒｏｚｏａｎ”ｇｅｎｕｓａｎｄａｆｅｗｒｅｃｅｐｔａｃｕｌｉｔｉｄｓａｒｅｄｅｓｃｒｉｂｅｄｈｅｒｅ .Ｔｈｅｓｐｈｉｎｃｔｏｚｏａｎｓｉｎｃｌｕｄｅｔｈｅｆｏｌｌｏｗｉｎｇｇｅｎｅｒａ :Ｓｔｙｌｏｔｈａｌａｍｉａ ,Ｌｉｃｈｕａｎｏｓｐｏｎｇｉａ ,Ｔｅｂａｇａｔｈａｌａｍｉａ ,Ｉｍｂｒｉｃａｔｏｃｏｅｌｉａ ,Ｉｎｔｒａｓｐｏｒｅｏｃｏｅｌｉａ ,ＲｈａｂｄａｃｔｉｎｉａａｎｄＬｉｎｇｙｕｎｏｃｏｅｌｉａ .ＴｈｅｉｎｏｚｏａｎｓｐｏｎｇｅｓａｒｅＰｅｒｏｎｉｄｅｌｌａ ,ＩｎｔｒａｔｕｂｏｓｐｏｎｇｉａａｎｄＣａｖｕｓｏｎｅｌｌａ .ＴｈｅｈｙｄｒｏｚｏａｎｓａｒｅｒｅｐｒｅｓｅｎｔｅｄｏｎｌｙｂｙｏｎｅｇｅｎｕｓＲａｄｉｏｔｒａｂｅｃｕｌｏｐｏｒａｉｎｃｌｕｄｉｎｇ 3.ｐｅｃｉｅｓ.Ｗｉｔｈｉｎｔｈｅｓｅｆｏｒｍｓ,Ｌｉｎｇｙｕｎｏｃｏｅｌｉａｓｐｈｅｒｉｃａｉｓｅｓｔａｂｌｉｓｈｅｄｈｅｒｅａｓａｎｅｗｇｅｎｕｓａｎｄａｎｅｗｓｐｅｃｉｅｓ ,ｗｈｉｌｅＬｉｃｈｕａｎｏｓｐｏｎｇｉａｇｕａｎｇｘｉｅｎｓｉｓｉｓｒｅｇａｒｄｅｄａｓａｎｅｗｓｐｅｃｉｅｓ .ＡｌｌｏｆｏｔｈｅｒｆｏｒｍｓｍｅｎｔｉｏｎｅｄａｂｏｖｅｗｅｒｅｆｏｕｎｄｕｓｕａｌｌｙｉｎｔｈｅＰｅｒｍｉａｎｒｅｅｆｓｏｆＳｏｕｔｈＣｈｉｎａ .ＳｅｎｏｗｂａｒｉＤａｒｙａｎ(1990 ) ｐｒｏｐｏｓｅｄｔｈａｔｔｈｅＣｙｓｔａｕｌｅｔｅｓ,ＡｓｃｏｓｙｍｐｌｅｇｍａａｎｄＬｉｃｈｕｎｏｓｐｏｎｇｉａｓｈｏｕｌｄｂｅｓｕｂｓｔｉｔｕｔｅｄｂｙｅａｒｌｉｅｒｅｓｔａｂｌｉｓｈｅｄｇｅｎｕｓＤｉｓｃｏｓｉｐｈｏｎｅｌｌａＩｎａｉ (193. ) ,ｂｕｔＬｉｃｈｕａｎｏｓｐｏｎｇｉａｉｓｑｕｉｔｅｄｉｆｆｅｒｅｎｔｆｒｏｍＤｉｓｃｏｓｉｐｈｏｎｅｌｌａｂａｓｅｄｏｎｇｅｎｅｒａｌｓｈａｐｅｓ,ｏｕｔｌｉｎｅｓｏｆｃｈａｍｂｅｒｓａｎｄｔｈｅａｂｓｅｎｃｅｏｆｖｅｓｉｃｕｌａｒｔｉｓｓｕｅｉｎｔｈｅｃｅｎｔｒａｌｔｕｂｅｓ,ｔｈｅｒｅｆｏｒｅＬｉｃｈｕａｎｏｓｐｏｎｇｉａｉｓｒｅｇａｒｄｅｄｓｔｉｌｌａｓａｎｉｎｄｅｐｅｎｄｅｎｔｇｅｎｕｓｗｉｔｈｉｎｔｈｅｓｐｈｉｎｃｔｏｚｏａｎｓ.ＴｈｅｎｅｗｇｅｎｕｓＬｉｎｇｙｕｎｏｃｏｅｌｉａｈａｓｓｏｍｅｃｏｍｍｏｎｓｉｍｉｌａｒｉｔｉｅｓｗｉｔｈＳｏｌｌａｓｉａａｎｄＧｉｒｔｙｏｃｏｅｌｉａ ,ｂｕｔｔｈｅａｂｓｅｎｃｅｏｆｐｏｒｅｓａｎｄｔｕｂｅｓｏｆｖａｒｉｏｕｓｋｉｎｄｓｏｎｔｈｅｗａｌｌｓｏｆｓｐｈｅｒｉｃａｌｃｈａｍｂｅｒｓｃａｎｎｏｔｂｅｐｅｒｍｉｔｔｅｄｔｏｉｎｃｌｕｄｅｔｈｅｐｒｅｓｅｎｔｎｅｗｆｏｒｍｉｎｔｏｅｉｔｈｅｒｏｆｔｗｏｇｅｎｅｒａ ,ｔｈｅｒｅｆｏｒｅａｎｅｗｇｅｎｕｓｉｓｅｓｔａｂｌｉｓｈｅｄｈｅｒｅｆｏｒｔｈｉｓｆｏｒｍ .ＩｎｔｈｉｓｐａｐｅｒｔｈｅｇｅｎｕｓＲａｄｉｏｔｒａｂｅｃｕｌｏｐｏｒａｉｓｓｔｉｌｌｖｉｅｗｅｄａｓａｇｅｎｕｓｗｉｔｈｉｎｔｈｅｈｙｄｒｏｚｏａｎｃｌａｓｓｒａｔｈｅｒｔｈａｎｔｈｅＩｎｏｚｏａｎｏｒｄｅｒｂｅｃａｕｓｅＲａｄｉｏｔｒａｂｅｃｕｌｏｐｏｒａｉｓｃｈａｒａｃｔｅｒｉｚｅｄｂｙｔｈｅｉｒｒａｔｈｅｒｒｅｇｕｌａｒｄｉｓｔｒｉｂｕｔｉｏｎｏｆｒａｄｉａｌｔｒａｂｅｃｕｌａｅ .Ｔｈｅｓｅｔｒａｂｅｃｕｌａｅｃａｎｎｏｔｂｅｃｏｎｓｉｄｅｒｅｄａｓｆｉｂｒｅｓｏｆｉｎｏｚｏａｎｓｐｏｎｇｅｓ,ａｎｄｔｈｏｓｅｅｘｈａｌａｎｔｔｕｂｅｓａｒｅｒｅｇａｒｄｅｄｈｅｒｅａｓｃａｎａｌｓｂｅｔｗｅｅｎｔｗｏｔｒａｂｅｃｕｌａｅ

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

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CHARACTERISTICS　OF　MODERATE－SMALL－SIZE　INTERMONT　BASINS　STRUCTURES　AND　PROSPECTS　FOR　OIL－GAS　EXPLORATION　IN　TIANSHAN　MOUNTAIN　STRUCTURAL　BELTS

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新疆石油地质 1996年第1期 85-93页

作者： Yu Renlian Yang Shusheng(Ceologic team,Northwestern Petroleum geology {2.,Ministry of Ceology and Mineral {3.,Urumqi 83.011) Han Jun

ＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＭＯＤＥＲＡＴＥ－ＳＭＡＬＬ－ＳＩＺＥＩＮＴＥＲＭＯＮＴＢＡＳＩＮＳＳＴＲＵＣＴＵＲＥＳＡＮＤＰＲＯＳＰＥＣＴＳＦＯＲＯＩＬ－ＧＡＳＥＸＰＬＯＲＡＴＩＯＮＩＮＴＩＡＮＳＨＡＮＭＯＵＮ... 详细信息

ＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＭＯＤＥＲＡＴＥ－ＳＭＡＬＬ－ＳＩＺＥＩＮＴＥＲＭＯＮＴＢＡＳＩＮＳＳＴＲＵＣＴＵＲＥＳＡＮＤＰＲＯＳＰＥＣＴＳＦＯＲＯＩＬ－ＧＡＳＥＸＰＬＯＲＡＴＩＯＮＩＮＴＩＡＮＳＨＡＮＭＯＵＮＴＡＩＮＳＴＲＵＣＴＵＲＡＬＢＥＬ...

关键词： Xinjiang Tianshan Mountain Intermont depression Structural feature Oil-gas exploration

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COUNTERMEASURES AGAINST LANDSLIDE GEOLOGICAL DISASTERS IN TIBET

引用

Natural Disaster Reduction in china 2002年第4期 37-41页

作者： Yang Quanzhong (No. 915 hydrogeological team, {2. of {3. & Mining, Meishan 62.010, Sichuan Province, china)

The special natural geographical and geological environment of Tibet, in combination with increasingly intensified human (engineering and economic) activities, is responsible for the increasingly serious landslide disasters in terms of scope, scale, frequency and degree of damage. The article presents systematically the development, distribution and major damaging effects of landslide geological disasters in Tibet, provides a preliminary forecast on the tendency of landslide formation, and proposes some strategies and measures for preventing & reducing the disasters. It may serve as a basis for decision making by governments at various levels in their fighting against landslide disasters.

关键词： Tibet landslide disasters countermeasures

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