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   

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

Zhang Jingfa  Tang Rongyu  Chen Xuebo  Wang Enfu  Li JingshenWT  ”BX 《地学前缘》2000,(Z1)

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

Petroleum Geological Conditions in Qiangtang Basin     

Lei Zhenyu  Li DeshengWT  ”BX 《地学前缘》2000,(Z1)

PETROLEUM GEOLOGICAL CONDITIONS IN QIANGTANG BASIN  相似文献   

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   

FROM BACK-ARC BASIN TO BACK-ARC FORELAND BASIN—THE SEDIMENTARY BASIN AND TECTONIC EVOLUTION OF THE LATE CALEDONIAN—EARLY HERCYNIAN STAGES IN CORRIDOR AND NORTH QILIAN MTS   总被引：1，自引：0，他引：1  

Du Yuansheng  Gong Shuyun  Han Xin  Wang Jiasheng  Hou Guangjiu 《地学前缘》2000,(Z1)

FROM BACK-ARC BASIN TO BACK-ARC FORELAND BASIN—THE SEDIMENTARY BASIN AND TECTONIC EVOLUTION OF THE LATE CALEDONIAN—EARLY HERCYNIAN STAGES IN CORRIDOR AND NORTH QILIAN MTSthenationalNaturalScienceFoundationofChina(No.4 9972 0 78)  相似文献   

IS CHINA LEARNING FROM ITS NEIGHBORS? A COMPARISON OF OVERSEAS INVESTMENT BETWEEN CHINA AND OTHER EAST ASIAN ECONOMIES   总被引：1，自引：0，他引：1  

WANG Mark Yao-lin 《中国地理科学(英文版)》2000,10(4):326-334

1INTRODUCTIONAfter2decades'opendoorpractice,Chinahasnotonlybeenabigplayerasanimportanthostnationtoforeigndirectinvestment(FDI),butalsothelargestFDIhomenationamongthedevelopingcountries(SUN,1998;ZHANG,1995;WorldInvestmentReport,1998).Infact,sincethelate1980s,theChinesegovernmenthasnotsimplyputitseffortintoexportingmade-in-China"productstoearnforeigncurrencyorintoencouragingforeigninwardcapital.Ithasactivelyencourageditsmanufacturerstoinvestoverseas,andhasdeliberatelyandstrategical…  相似文献