The Characteristics of Remote Sensing Tectonics in Qiangtang-Changdu Massif, Qinghai-Tibet Plateau     

Zhao Zhengzhang  Ye Hefei  Li Yongtie 《地学前缘》2000,(Z1)

THE CHARACTERISTICS OF REMOTE SENSING TECTONICS IN QIANGTANG-CHANGDU MASSIF, QINGHAI-TIBET PLATEAU  相似文献   

Ultramafic xenoliths in mesozoic diorite in west shandong province   总被引：19，自引：2，他引：17  

CHEN Lihui  & ZHOU Xinhua .The Key Laboratory of Orogenic Belts  Crustal Evolution  Ministry of Education  China  School of Earth  Space Sciences  Peking University  Beijing  China  .Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  China Correspondence should be addressed to Chen Lihui 《中国科学D辑(英文版)》2004,47(6):489-499

Deep-seated xenoliths are common in alkali ba-salts, kimberlites and lamprophyres[1]. These host rocks are all basic or ultrabasic volcanic and subvol-canic rocks originating from mantle. Reports of ul-tramafic xenoliths found in plutons are uncommon except those of Mesozoic diorites in North China[2—6]. This paper provides detailed mineralogy, petrology and geochemistry of ultramafic xenoliths in Tietong-gou pluton, Laiwu, Shandong Province, and discusses the possibility of their deep-sea…  相似文献   

Carbon isotopic variations of Proterozoic carbonates in Jixian,Tianjin, China   总被引：4，自引：2，他引：2  

CHU Xuelei  ZHANG Tonggang  ZHANG Qirui  FENG Lianjun & ZHANG Fusong. Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  China  . Key Laboratory for Mineral Resources Research  Chinese Academy of Sciences  Beijing  China Correspondence should be addressed to Chu Xuelei 《中国科学D辑(英文版)》2004,47(2):160-170

Along the Proterozoic stratigraphic sections of Jixian, Tianjin, the δ13C values of carbonates are mostly negative in the Changchengian (Changcheng System), varying approximately within a range of (0±1 )‰in the Jixianian (Jixian System), and have commonly positive values of (2±2)‰ in the Qingbaikouan (Qingbaikou System). From Chuanlinggou Formation to Dahongyu Formation, i.e. from ca. 1700 Ma to 1600 Ma, the δ13C values of carbonates increase from about -3‰ to 0‰, but oscillate with large excursion in Dahongyu Formation. Two large excursions occur in the Jixianian, one in Yangzhuang Formation and the other in the third sub-member of Wumishan Formation overlaying. These integrated and continuous records of carbon isotope reflect secular variations of δ13C value in ancient seawater from ca. 1700 Ma to ca. 800 Ma. The increase and subsequent oscillation of seawater δ13C value occurring from the ages of ca. 1700 to ca. 1600 Ma and <1300 Ma may signify two correlative global tectonic events.  相似文献   

Direct evidence of transformation from smectite to palygorskite: TEM investigation   总被引：3，自引：0，他引：3  

CHEN Tianhu  XU Huifang  LU Anhuai  XU Xiaochun  PENG Shuchuan &YUE Shucang .College of Resources  Environmental Engineering  Hefei University of Technology  Hefei  China  .Department of Geology  Geophysics  University of Wisconsin  Madison  WI  USA  .Department of Geology  Peking University  Beijing  China Correspondence should be addressed to Chen Tianhu 《中国科学D辑(英文版)》2004,47(11):985-994

Palygorskiteusuallyisonlyaminorcomponentofmodernsedimentsandsoils.Onlyinspecificenvi-ronmentscanitoccurinlargeamountsandformeco-nomicaldeposits.Inspiteofitsscarcity,thismineralhasbeenrecordedinnumerousenvironments,rangingfromdeepseaandperitidalflatstosoilsandlacustrinesedimentaryrock[1—4].Palygorskiteinsedimentaryrocksandsoilscanbeofthreedifferentorigins:inherited,detritalandauthigenic[5].Theformationmechanismsofauthigenicpalygorskitearestillcontroversial,andvariousproc-esseshavebeenproposedf…  相似文献   

Continental hydrothermal sedimentary siliceous rock and genesis of superlarge germanium (Ge) deposit hosted in coal: A study from the Lincang Ge deposit,Yunnan, China   总被引：3，自引：0，他引：3  

QI Huawen    HU Ruizhong  SU Wenchao  QI Liang & FENG Jiayi .Key Laboratory of Ore Deposit Geochemistry  Chinese Academy of Sciences  Guiyang  China  .Department of Earth Sciences  Nanjing University  Nanjing  China Correspondence should be addressed to Qi Huawen 《中国科学D辑(英文版)》2004,47(11):973-984

The study on marine hydrothermal sedimentationtends to be perfect at present, and a suit of hydrother-mal sedimentary distinguishing criterions (includingstructure, conformation, geochemistry, etc.) has beenfound[1—12]. While it is unsubstantial on the study ofhydrothermal sedimentation in continental deposi-tional environment, and little was known about therelation between continental hydrothermal sedimenta-tion and metal mineralization. The Lincang Ge deposit,hosted in coal with independent…  相似文献   

Determination of Trace Germanium in Marine Sediments by Hydride Generation-Atomic Fluorescence Spectrometry （HG-AFS）     

LI Jing )  *  ZHAO Shilan )  ZHANG Zhaohui )  ZENG Xianjie )) Ocean University of China  Qingdao  P..R.China) Environment Protection Administration of Jiaonan City  Jiaonan  P..R.China 《中国海洋大学学报(英文版)》2004,3(2):179-182

1　Introduction　Germaniumisatypicaldispersedelementintheearth’scrustwithanaveragecontentof 7mgkg- 1.Itisdistributedinthecrustintheformofsilicate ,sul fide ,sulfate (FroelichandAndreae ,1981)andsoon .Atpresent ,manymethods ,suchashydridegenera tion induc…  相似文献   

南北半球高低层环流切变与长江流域夏季降水异常的关系   总被引：2，自引：2，他引：2       下载免费PDF全文

艾 《应用气象学报》2005,16(Z1):48-55

利用奇异值分解 (SVD)方法分析和讨论了夏季 85 0hPa和 2 0 0hPa高低层纬向风距平差与我国夏季降水异常的关系 ,发现澳大利亚东北部高低层纬向风切变与长江中下游地区降水有较好的反相关 ,并定义了澳大利亚季风指数。 9个澳大利亚冬季风 (南半球 )指数低值年与 7个高值年我国夏季降水的平均差值图表明 ,显著的降水差异出现在长江中下游 ,低值年有利于长江中下游地区降水偏多 ;澳大利亚冬季风指数与夏季北半球 5 0 0hPa高度场的相关图在东亚至西太平洋的相关分布呈现出“ - -”结构 ,在我国长江以南的中低纬和贝加尔湖的高纬地区是负相关区 ,正相关在我国北方至日本的中纬地区。  相似文献   

德国GPS在线位移监控和预警系统工作原理与工程应用     

项伟  R.J 《地质科技情报》2005,24(Z1):126-128

德国GPS在线位移监控和预警系统,除了可以进行GPS测量和数据处理外,还可给出观测点的实时三维位移数据、位移速度和位移加速度,绘出分析曲线,其测量精度达毫米级,并可根据预先设定的破坏概率自动报警.该系统可预测和预警自然灾害如滑坡、泥石流、地震等;在矿山开采作业中,可对矿坑、尾矿坝及采空区的地表塌陷进行监控;可用于岩土工程和土木工程建设中的高边坡、建筑物、基坑、挡土墙以及塔楼和桥梁高频率运动的监测;可广泛应用于水利工程建设,如大坝、大堤位移和沉陷的监控等.在道路建设中,可应用于隧道开挖、路堤沉陷和桥梁位移的观测.  相似文献   

不断深化改革调整企业结构促进武建集团加快发展     

武汉建工 《中国勘察设计》2005,(1):41-43,50

改革开放以来，武建集团坚持以市场为取向，与时俱进，大胆探索，不断深化企业改革，优化企业结构，转换企业体制和机制，创新企业管理，推动了企业持续发展，在集团信誉、工程质量、经营领域和地域的开拓等方面不断取得了新的进步。下面就武建集团的改革和我们的体会向大家作一汇报。  相似文献   

GEOCHEMISTRY OF EARLY CRETACEOUS TRACHYTES OF DONGLINGTAI FORMATION FROM THE XISHAN AREA, BEIJING： CONSTRAINTS ON MELTING OF LOWER MAFIC CRUST     

LI Xiaoyong  *  FAN Weiming  GUO Feng  WANG Yuejun  LI Chaowen 《大地构造与成矿学(英文版)》2005,29(1):44-57

Felsic igneous rocks are of widespread magma types in continental orogenic belt, the petrologic genesis of which provides very important indication for understanding crustal evolution and melting geodynamic process within orogenic belt. Because of the differences of meltingdynamic condition, e.g. (1) composition of source rock; (2) physical chemistry conditions such as temperature, pressure etc.; (3) composition of residual phases and so on, felsic igneous rocks exhibit distinctly diverse petro…  相似文献