Chief Editor:HOU Zengqian
Governing Body:China Association for Science and Technology
Organizer:Geological Society of China
start publication :1922
ISSN:ISSN 1000-9515
CN:CN 11-2001/P
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ZHANG Zunzhong , GU Lianxing , WU Changzhi , LI Weiqiang , XI Aihua , WANG Shuo State Key Laboratory of Mineral Deposit Research
2005, 79(4).
Abstract:The timing of the emplacement of the Weiya pluton remains controversial due to the absence of systematic and precise dating. This paper reports zircon SHRIMP U-Pb dating of different lithologic phases in the Weiya pluton, and discusses the genesis and tectonic environment. The ages of gabbro, quartz syenite, diorite porphyrite and fine-grained granite are 236?6 Ma, 246?6 Ma, 233?8 Ma and 237?8 Ma, respectively. All these phases were formed in early-middle Indosinian (Triassic) in a post-orogenic environment. In addition to underplating, intraplating of mantle-derived magmas is also a substantial mechanism for magma generation and vertical accretion of the continental crust. Granitoid rocks are important products of vertical continental accretion as underplating evolves gradually to intraplating. The existence of post-orogenic Indosinian granites shows that the middle Tianshan orogenic belt underwent an important tectonic conversion from the Paleo-Asian ocean subduction-collision system to the Paleo-Tethys ocean regime.
MA Xueping , Paul COPPER , SUN Yuanlin , LIAO Weihua The Key Laboratory of Orogenic Belts , Crustal Evolution , Department of Geology , Peking University , Beijing , China , E-mail: maxp@pku.edu.cn Department of Earth Sciences , Laurentian University , Sudbury , Canada PE C Nanjing Institute of Geology , Palaeontology , Chinese Academy of Sciences , Nanjing , Jiangsu , China
2005, 79(4).
Abstract:1 Introduction Southern Guizhou, especially the Dushan area, has been one of the most important areas for the study of the Devonian in South China, for example, Hou and Xian’s (1975) study of the Eifelian brachiopod fauna. The Upper Devonian in the Dushan section is mainly composed of carbonate rocks, with rare siliciclastics. Abundant benthic fossils (corals and brachiopods) have been found in these Frasnian strata (Liao et al., 1979). The Frasnian corals were described by Liao (1977)…
Lü Junchang and YUAN Chongxi Institute of Geology , Chinese Academy of Geological Sciences , Beijing , E-mail: tmcpl@yahoo.com
2005, 79(4).
Abstract:A new tapejarid pterosaur Huaxiapterus jii gen. et sp. nov. is erected based on a nearly complete skeleton with a skull. The skull morphology of Huaxiapterus jii gen. et sp. nov. appears transitional between the skulls of Sinopterus and Tapejara. The skull morphology (low crest) of Huaxiapterus jii indicates that Huaxiapterus is more closely related to Sinopterus than to Tapejara, which has a high crest. The relatively long and shallow skull of Sinopterus indicates that it is a primitive form. Huaxiapterus is more derived than Sinopterus but more primitive than Tapejara.
WAN Chuanbiao , QIAO Xiuyun , XU Yanbin , SUN Yuewu , REN Yanguang , JIN Yudong , GAO Ping , LIU Tongyan Exploration , Development Research Institute of Daqing Oilfield Company Ltd. , Daqing , Heilongjiang , E-mail: wcb@vip.sina.com College of Earth Sciences , Jilin University , Changchun , Jilin Research Center of Paleontology , Stratigraphy , Jilin University , Changchun , Jilin
2005, 79(4).
Abstract:Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are (in ascending order): the Impardecispora-Aequitriradites-Clavatipollenites assemblage; the Triporoletes-Pilosisporites-Asteropollis assemblage; and the Appendicisporites-Asteropollis-Tricolpites assemblage, distributed in Members 1, 2 and 3 of the Yimin Formation respectively. Recognition of this biostratigraphic sequence is very important for the division and correlation of the Yimin Formation in the basin. Meanwhile, the age of the Yimin Formation is considered to be Barremian to Early Albian based on the palynological data.
BIAN Qiantao , ZHU Shixing , I. I. POSPELOV , M. A. SEMIKHATOV , SUN Shufen , CHEN Daizhao , NA Chunguang Institute of Geology , Geophysics , Chinese Academy of Sciences , Beijing , China , E-mail: bianqt@mail.igcas.ac.cn Tianjin Institute of Geology , Mineral Resources , China Geological Survey , Tianjin , China Geological Institute , Russian Academy of Sciences , Moscow , Russia
2005, 79(4).
Abstract:1 Introduction The stromatolites of the Jiawengmen area in the southern belt of the Eastern Kunlun orogen were initially interpreted as vortex structures by the Regional Geological Survey Team, Qinghai Bureau of Geology and Mineral Resources in 1973; these samples were then identified as algal fossils of Sinian age by the Nanjing Institute of Geology and Paleontology (Qinghai Bureau of Geology and Mineral Resources, 1973). In 1994, Chen and Luo (1998) discovered some stromatolites, i…
HU Huabin , MAO Jingwen , LIU Dunyi , NIU Shuyin , WANG Yanbin , LI Yongfeng , SHI Ruruo Shijiazhuang University of Economics , Shijiazhuang , Hebei China University of Geosciences , Beijing , Email: huhb@.com Institute of Geology , Chinese Academy of Geological Science , Beijing
2005, 79(4).
Abstract:1 Introduction Since the Guilaizhuang gold deposit was discovered in the 1980s, the Tongshi magmatic complex has attracted attention since it exhibits a spatial-temporal relationship to gold mineralization. In the past ten years, a number of detailed fundamental researches have been carried out on the complex, Guilaizhuang gold deposit and their relationships (Qiu et al., 1994; Lin et al., 1996; Yan et al., 1996; Xu et al., 1999; Kong et al., 2001; Shun et al., 2001). Up to date, some res…
LING Hongfei , SHEN Weizhou , DENG Ping , JIANG Shaoyong , JIANG Yaohui , YE Haimin , PU Wei , TAN Zhengzhong State Key Laboratory of Mineral Deposit Research , Department of Earth Sciences , Nanjing University , Nanjing , Jiangsu , E-mail: hfling@icpms.nju.edu.cn Research Institute No. , CNNC , Shaoguan , Guangdong
2005, 79(4).
Abstract:1 Introduction There are many mafic dikes in the Xiazhuang uranium ore field located in the eastern part of the Guidong composite granite body in northern Guandong Province. The uranium ores are closely associated spatially with mafic dikes (Fig. 1) (Deng et al., 2003). Many studies have been conducted since the 1950s mainly focusing on the genesis of uranium mineralization and its relationship with the mafic dikes (Wang, 1986, 1989; Hu, 1989; Hu and Jin, 1990; Jin and Hu, 1990; Hu et al…
WU Genyao Institute of Geology , Geophysics , Chinese Academy of Sciences , Beijing E-mail: dzkx@mail.igcas.ac.cn
2005, 79(4).
Abstract:The Tan-Lu Fault was once a transform fault in the Paleotethys, west of which was the Qinling-Dabie Ocean separating the Yangtze Craton from the North China Craton, and east of which was the Su-Lu Ocean separating the Su-Wan Block from the Jiao-Liao Craton. The Qinling-Dabie Ocean closed in the Indosinian orogeny, which created the China-Southeast Asia Subcontinent, with the Tan-Lu Fault becoming a marginal shear zone along the newly-formed amalgamated subcontinent. The Su-Lu Ocean subducted partly in the Indosinian orogeny, but not closed. In the Jurassic and Early Cretaceous, the Su-Wan Block drifted northwards with subduction of the Su-Lu Ocean and moved westwards to converge the subcontinent by sinistral shearing of the ENE-striking fractures. The Su-Lu Ocean finally closed and the Su-Wan Block collided with the Jiao-Liao Craton in the Early Cretaceous, which constituted a part of the magnificent interplate Yanshanides. The interplate orogeny rejuvenated the fossil sutures and deep fractures, as well as the Indosinian orogen, and the intraplate (intracontinental) Yanshanian orogeny occurred in the subcontinent. The East Asia Yanshanides, consisting of the interplate orogens in the outer side and the intraplate orogens in the inner side, collapsed quickly in the latest Early Cretaceous and Late Cretaceous. The eastern China area entered a tensile period from the Eogene, and the tectonic differentiation between the central and eastern China areas since the Jurassic was further strengthened.
ZHANG Zhongyi , WU Ganguo , Guo Jinghui , ZHANG Da Key Laboratory of Lithospheric Tectonics , Lithoprobing Technology , Ministry of Education , University of Geosciences , Beijing , E-mail: zy_zhang@sina.com Institute of Geology , Geophysics , Chinese Academy of Sciences , Beijing
2005, 79(4).
Abstract:1 Introduction Basin analysis is an integrated study of sedimentary basins as geodynamical entities. Sedimentary basins are worthy of studying because they are primary repositories of geological information on subsidence, crust evolution and valuable clues to the way by which the lithosphere deforms (Philip and Jone, 2002). Although relatively successive sedimentary sequences from Jurassic to Cretaceous are preserved in western Shandong, the Mesozoic deposits and basins have received a litt…
LIU Yongqing , GAO Linzhi , LIU Yanxue Institute of Geology , Chinese Academy of Geological Sciences , Beijing , E-mail: liuyongqing@cags.net.cn
2005, 79(4).
Abstract:Molar tooth structure (MTS) represented by complex ptygmatical shapes is widely distributed in the Proterozoic of the world. MTS filled by fine, equant sparry calcite (or dolomite) displays an abrupt contact with hosting rocks, which are mainly composed of carbonaceous micrites and fine-grained carbonates with local silts and storm-dominated deposits with graded, cross or wave beddings, numerous erosional surfaces and truncated and fills or guttered bases. Occurrence of MTS suggests a result of the constraint of sedimentary facies, and the storm-base in ramp settings is the maximum depth for the formation of MTS. Vertical succession of MTS-bearing carbonates shows a deposition stacked by high-frequency shallow subtidal and peritidal cycles. An individual cyclic MTS-bearing sequence is characterized by thinning, shallowing and dynamic decreasing-upward, and peritidal caps of purple red iron and organic carbonaceous sediments with more complicated shapes of MTS are common on the top of individual MTS-bearing sequences.
CHEN Jiansheng , ZHAO Xia , SHENG Xuefeng , Wang Jiyang , , GU Weizu , CHEN Liang State Key Laboratory of Hydrology-Water Resources , Hydraulic Engineering , Hohai University , Nanjing , Jiangsu , E-mail: jschen@hhu.edu.cn Institute of Isotope Hydrology Research , Hohai University , Nanjing , Jiangsu Institute of Geology , Geophysics , Chinese Academy of Sciences , Beijing
2005, 79(4).
Abstract:1 Introduction The Badain Jaran Desert, located in western Inner Mongolia, China, has a unique landscape containing 144 lakes (72 of which are still watery) with a total water area of about 23 km2, and the world’s highest stationary sand dunes with a height between 200 m and 500 m. Much attention has been paid to the water recharge of the desert in the past decade. Investigations on the resources of water system there have been performed continuously since the early 1990s, which lead to th…
LI Yanhe , WANG Yimin , SONG Hebin , YUE Guoliang , Laboratory of Isotope Geology , Ministry of Land , Resources , Beijing , E-mail: lyh@mx.cei.gov.cn Institute of Mineral Resources , Chinese Academy of Geological Sciences , Beijing , National Geoanalysis Center , Beijing
2005, 79(4).
Abstract:1 Introduction Tellurium is located in the fifth period and the sixth major group of the element periodic table, whose chemical nature is similar to those of sulfur and selenium. Tellurium is a scattered rare element on the earth and its concentration is very low in earth’s crust, only 1.0 ng/g (Cox, 1989). However, the tellurium content is extremely high in aerolites, up to 2320 ng/g (Anders and Grevesse, 1989). Independent tellurium minerals are scarce, with only calaverite, tetradymite,…
Emel BAYHAN , Mustafa ERG?N , Abidin TEMEL , ?eref KESK?N Faculty of Engineering , Department of Geological Engineering , Hacettepe University , Beytepe , Ankara , Turkey Ankara University , Geological Research Center for Fluvial , Lacustrine , Marine Environments
2005, 79(4).
Abstract:1 Introduction The Black Sea (Fig. 1) with a surface area of 432.000 km2 and water depths exceeding 2200 meters is a semi-enclosed and the largest modern anoxic basin in the world having characteristic hydrographic, morphological and geological conditions varied with space and time (Degens and Ross, 1974; Ross et al., 1978; Sorokin, 1983). Geologically, the formation of the greate Black Sea basin can be traced back to the Late Cretaceous subduction of the Tethys Ocean beneath the Euroasi…
SUN Hongyan , TIAN Mingzhong , WU Fadong , ZHANG Jianping China University of Geosciences , Beijing , E-mail: shywch@.com
2005, 79(4).
Abstract:The question whether there have been Quaternary glaciations in the Da Hinggan area has puzzled glacial geologists for many years because no sufficient glacial evidence has been found in this area. The study of Quaternary glaciers in the Da Hinggan area is also a key issue of the glaciology in China because of the special location of this area. In the past two years, a large number of complete and typical glacial vestiges have been found in Hexigten in the southern Da Hinggan Mountains, such as fossil cirque groups, horns, knife-edge crests, terminal moraines, glacial stepped stones. These landforms are located at a watershed, which are thus impossible to be formed due to tectonic processes, water or weathering, but can only be formed by glaciation. The calculated flat indexes of the fossil cirques in the Hexigten are 1.7?4.5, 4?5 and 1.3?5, which are within the range of 1.7?5 that is the flat index of real cirques. The typical and complete moraines have also been found in this area. All these glacial vestiges prove that the Quaternary glaciers did exist in the Da Hinggan Mountains of eastern China. Thus, it is of important scientific significance for the research on Chinese, even the global climatic and environmental evolution since the Quaternary.
2005, 79(4).
Abstract:On the Stratigraphic Sequence, Lithological Characteristics and Origin of the Lower Permian Pangduo Group in Lhunzhub County, TibetJI Zhansheng, YAO Jianxin, WU Guichun, ZHAN Lipei, JIANG Zhongti and FU Yuanhui(Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037; Geologica] Physical Data Center, Ministry of Land and Resources, P. R. China, Hebei 065201; China University of Geosciences, Beijing 100083)The paper deals with the sequence and lithologi…
Chief Editor:HOU Zengqian
Governing Body:China Association for Science and Technology
Organizer:Geological Society of China
start publication :1922
ISSN:ISSN 1000-9515
CN:CN 11-2001/P