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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Lü Junchang and JI Qiang Institute of Geology , Chinese Academy of Geological Sciences , Beijing
2005, 79(3).
Abstract:A nearly complete skeleton with a lower jaw of pterosaur from the Early Cretaceous of western Liaoning is described and assigned to a new genus, Eoazhdarcho gen. nov.. The new genus is characterized by a relatively small size, the ratio of the length to width of the middle series cervical vertebrae approximately 3.5 and the ratio of humeral length to femoral length approximately 0.96. The humerus of Eoazhdarcho shows great resemblances to that of previously described Azhdarchidae, so it is assigned to the family Azhdarchidae.
YANG Qun , WANG Yujing , YIN Leiming , SHU Liangshu , LOU Fasheng , WANG Bo Nanjing Institute of Geology , Palaeontology , Chinese Academy of Sciences , Nanjing , Jiangsu , Department of Earth Sciences , Nanjing University , Nanjing , Jiangsu Geological Survey of Jiangxi Province , Nanchang , Jiangxi
2005, 79(3).
Abstract:1 Introduction The ophiolitic and slightly metamorphic complexes in northeastern Jiangxi have been traditionally considered to be related to the Proterozoic “Banxi (=Penhsi) Group” of the Jiangnan Uplift in South China and have become a classic area for the study of pre-Sinian stratigraphy. However, since Zhao et al. (1995, 1996) and He et al. (1996, 2000) (the Zhao-He research group) reported their discoveries of Paleozoic Radiolaria from the siliceous rocks in the ophiolitic and meta…
CHEN Yuanren , LI Xianghui , College of Earth Sciences , Chengdu University of Technology , Chengdu , Sichuan State Key Laboratory of Oil-Gas Reservoir Geology , Exploitation , Chengdu University of Technology , Chengdu , Sichuan ,
2005, 79(3).
Abstract:Twelve paleocommunities dominated by benthic brachiopod are recognized in the Givetian-Frasnian stages of the Devonian in the Longmenshan area, southwestern China, in which two kinds of brachiopod community replacement are classified. One is the abrupt replacement, represented by abrupt alternation between the Leiorhynchus community and Zhonghuacoelia-Striatopugnax community in the Frasnian Tuqiaozi Formation. The other is the gradual one, developed in the Givetian Guanwushan Formation, which had been completed by the shift of the Independatrypa lemma-Uncinulus heterocostellis-Emanuella takwanensis community via the Sinospongophyllum irregulare-Pseudomicroplasma fongi community to the Clathrocoilona spissa-Hexagonaria composite reef community. According to analyses of the paleocommunities, either the abrupt or gradual paleocommunity replacement of the Middle-Upper Devonian in the Longmenshan area is suggested as a response to the 5th-order sea level fluctuation due to the replacements of the paleocommunities in a tracts-system of depositional sequence. It is supposed that changes of paleocommunity diversity, one of the results of paleocommunity replacement, are depended on the range and magnitude of sea level fluctuation, but there is not a linear relationship between them. Furthermore, a suggestion is proposed that the concept of paleocommunity succession seem to be abandoned in the paleocommunity analysis because it almost never be practiced to recover the information of community succession in the geological record at present.
YU Huimin , XIA Qunke , E.DELOULE , YANG Xiaozhi CAS Key Laboratory of Crust-Mantle Materials , Environments , School of Earth , Space Sciences , University of Science , Technology of China , Hefei , Anhui , China , CRPG-CNRS , BP , Vandoeuvre Cedex , France
2005, 79(3).
Abstract:1 Introduction Recently, nominally anhydrous minerals (NAMs), such as olivine, pyroxene and garnet, have been found to contain trace amounts of hydrogen as OH? in their crystal lattice (Bell and Rossman, 1992; Rossman, 1996; Beran, 1999; Ingrin and Skogby, 2000; Williams and Hemley, 2001; Luth, 2003). Because of the importance of volume and mass in the mantle, NAMs probably represent the largest reservoir of hydrogen (Bell and Rossman, 1992; Ingrin and Skogby, 2000). Although the signi…
XU Shutong , LIU Yican , CHEN Guanbao , WU Weiping Anhui Institute of Geology , Hefei , Anhui , Laboratory of Continental Dynamics of the Ministry of Land , Resources , Beijing
2005, 79(3).
Abstract:The geometry of the Dabie Mountains is manifested in terms of the distribution of petro-tectonic units in three dimensions. It is identified into three segments from east to west, four horizons in vertical profiles and eight petro- tectonic units from north to south. Three segments are the east, middle and west segments. Four horizons, from top to bottom, are two different meta-tectonic mélange in the uppermost part, underthrust basement and cover below them, and mantle at the bottom of the profiles. Eight petro-tectonic units from north to south are: (1) the hinterland basin, (2) the meta -flysch, (3) the ultramafic rock belt (UM) + Sujiahe eclogite belt (SH), (4) eclogite belt 2 (Ec2) with most eclogites of continental affinity, (5) eclogite belt 1 (Ecl1) with some eclogite of oceanic affinity, (6) the Dabie complex or underthrust basement of the Yangtze continent, (7) the Susong and Zhangbaling Groups or underthrust cover of the Yangtze continent and (8) the foreland belt. The (3), (4) and (5) units belong to meta-tectonic mélange. Some ultrahigh pressure metamorphic minerals such as coesite and micro-diamonds have been found in (3) and (4) units; a possible ultrahigh pressure mineral, clinozoisite aggregate pseudomorph after lawsonite, was found in unit (5). The three tectonic units are speculated to be coherent initially; the UM and SH units are suggested to be the root belt in the east, middle and west segments respectively. The kinematics of the Dabie orogen is divided into three stages: top-to-south thrusting during the eclogite-granulite facies metamorphism, top-to-north extension during the amphibolite metamorphic stage, and faults or shear bands of brittle deformation and greenschist facies metamorphism were formed in the post-orogenic stage since the Late Jurassic and the movement pictures of these faults is different from each other.
MEI Mingxiang , MA Yongsheng , DENG Jun , CHEN Huijun Key Laboratory of Lithospheric Tectonics , Lithoprobing Technology of the Education Ministry , China University of Geosciences , Beijing , Department of Oil-Fields , China Petrochemical Corporation , Beijing
2005, 79(3).
Abstract:1 Introduction Much research has been carried out on the Upper Cambrian of the northern part of the North China Platform, including that on stratigraphy by Lu et al. (1994) and Xiang et al. (1981, 2000) as well as that on sedimentology by Wang et al. (1989), Meng et al. (1986) and Feng et al. (1990). In recent years, a great deal of fruitful research on sequence stratigraphy has been made, such as the chronostratigraphic studies of Shi et al. (1997) and Mei et al. (1996), and those on plat…
CHEN Shiyue , , JIN Zhangdong , , WANG Sumin and SHEN Ji Nanjing Institute of Geography and Limnology , Chinese Academy of Sciences , Nanjing , Jiangsu , School of Environment and Planning , Liaocheng University , Liaocheng , Shandong Institute of Earth Environment , Chinese Academy of Sciences , Xi’an , Shaanxi
2005, 79(3).
Abstract:1 Introduction As the most prominent geological event since the Cenozoic, the uplift of the Qinghai-Tibet Plateau plays an important role in the formation and evolution of global atmospheric circulation pattern and climate changes. This has been verified by more and more geological facts; especially when the plateau had uplifted to some key heights, it could exert a great influence on the global environment. The Tibetan area has already become a natural experiment field of scientific researc…
CHEN Lan , YI Haisheng , HU Ruizhong , ZHONG Hong , ZOU Yanrong Open Laboratory of Ore Deposit Geochemistry , Institute of Geochemistry , Chinese Academy of Sciences , Guiyang , Guizhou , Graduate School of Chinese Academy of Sciences , Beijing Institute of Sedimentary Geology , Chengdu University of Technology , Chengdu , Sichuan State Key Laboratory of Organic Geochemistry , Guangzhou Institute of Geochemistry , Chinese Academy of Sciences , Guangzhou , Guangdong
2005, 79(3).
Abstract:1 Introduction The concept of the Oceanic Anoxic Event (OAE) was introduced by Schlanger and Jenkyns (1976) to delineate a period of time characterized by abnormally high depositional and preservational rates of organic carbon in favorable marine environments in many parts of the globe. This concept, with particular respect to the Cretaceous, has since been discussed, elucidated, and refined by many researchers (e.g. Schlanger et al., 1987; Jenkyns, 1985). The signatures, causes and models…
2005, 79(3).
Abstract:1 Introduction There have been a lot of studies on the Upper Pleistocene-Holocene Series and the paleoclimate vicissitude in the Salawusu River valley on the southeastern border of the Mu Us Desert on the Ordos Plateau, China (Fig. 1) (de Chardin and Licent, 1924a, b; de Chardin and Young, 1930; de Chardin, 1941; Pei and Li, 1964; Kozlovski, 1971; Yuan, 1978; Dong et al., 1983, 1989, 1998; Gao et al., 1985; Lu, 1985; Guan et al., 1986; Shao, 1987; Li et al., 1988, 1993; Sun and Zhao…
XU Zhaowen , LU Xiancai , LING Hongfei , LU Jianjun , JIANG Shoyong , NIE Guiping , HUANG Shunsheng , HUA Ming State Key Laboratory of Mineral Deposit Research , Department of Earth Sciences , Nanjing University , Hankou Road , Nanjing , Jiangsu , Geological Survey of Jiangsu Province , Nanjing , Jiangsu
2005, 79(3).
Abstract:1 Introduction The region of the middle-lower reach of the Yangtze River is an important mineralized belt of Fe, Cu, Au, S and other elements, with a series of sedimentary-hydrothermal diplogenetic mineral deposits (Xu and Zhu, 1978; Liu et al., 1984; Gu and Xu, 1986; Gu et al., 1993, 2000; Zhai et al., 1992). Some geologists thought that the Carboniferous massive sulfide exhalative sediment was the basis of the late diplogenetic mineralization (Gu and Xu, 1986; Gu et al., 1993, 2000); o…
LU Yuanfa , CHENG Yuchuan , LI Huaqing , XUE Chunji and CHENG Fuwen Yichang Institute of Geology and Mineral Resources , Yichang , Hubei Chinese Academy of Geological Sciences , Beijing Chang’an University , Xi’an , Shaanxi
2005, 79(3).
Abstract:1 Introduction Metallogenic chronology is one of the keys in the research of mineral deposits. Determination of metallogenetic epoch is very important for understanding the relationships between mineralization and regional tectonomagmatic events, in studying the origin of mineral deposits, and for summarizing regional mineralization and instructing regional prospecting. The eastern Liaoning region hosts the main concentration of boron resources in China. The boron reserve in eastern Liaoning…
REN Jianguo , WANG Xianbin , OUYANG Ziyuan College of Marine Geosciences , Ocean University of China , Qingdao , Shandong Lanzhou Institute of Geology , Chinese Academy of Sciences , Lanzhou , Gansu Institute of Geochemistry , Chinese Academy of Sciences , Guiyang , Guizhou
2005, 79(3).
Abstract:1 Introduction It is difficult to identify carbon dioxide origin merely by C isotopic compositions in the C-H-O system near surface environments due to possible contamination of crustal components and ambiguous information provided by carbon isotopic compositions. However, analysis of MORB basalts, xenoliths, volcanic gas, hot-spring gas, etc., has shown that CO2 gas is the principal carrier phase of mantle-derived He (Gerlach, 1989; Javoy and Pineau, 1991; Trull et al., 1993). 3He is th…
2005, 79(3).
Abstract:Geochemical Characteristics of Fossil Ginkgo huttonii Cuticles from the Jurassic in Gansu, ChinaSHI Yajun, SUN Bainian, ZHANG Chengjun and YAN Defei (Key Laboratory of Western China's Environmental Systems of the Ministry of Education, College of Earth and Environmental Science, Lanzhou University, Lanzhou, Gansu 730000)A comparison analysis of geochemical characteristics was made on cuticles of Jurassic fossil Ginkgo huttonii from the Minhe Basin in Gansu and extant Ginkgo b…
YU Wenhui , LIU Congqiang The State Key Laboratory of Environmental Geochemistry , Institute of Geochemistry , Chinese Academy of Sciences , Guiyang , Guizhou , Graduate School of Chinese Academy of Sciences , Beijing
2005, 79(3).
Abstract:An experimental study was carried out on the sorption of tetravalent ions Zr4+ and Hf4+ onto hydrous ferric oxide (HFO) and their fractionation behavior during colloid/solution interaction. The sorption of the isovalent ions Zr4+ and Hf4+ onto HFO is nonlinear, and they are fractionated during the sorption and co-precipitation processes: Zr4+ is more affinitive for HFO than Hf4+. At pH<6, the Zr/Hf ratios in solid phase decrease sharply with increasing pH values, but keep unchanged at pH>6. In both cases, the sorption/desorption or particle/water reaction can significantly fractionate Zr/Hf in the surface environment of the Earth.
PAN Jiahua , E.H.De CARLO , YANG Yi , LIU Shuqin , YOU Guoqin Institute of Mineral Resources , Chinese Academy of Geological Sciences , Beijing , China , Department of Oceanography , University of Hawaii , Pope Rd. , Honolulu , Hawaii , U.S.A. The Graduate School of The Chinese Academy of Sciences , Yuquan Road , Beijing , China
2005, 79(3).
Abstract:A detailed study on a small scale of the effect of phosphatization on the chemistry of marine cobalt-rich ferromanganese crusts supplies useful information for the evaluation and comprehensive utilization of crust mineral resources. Sub-samples from top to bottom of a 10-cm thick sample from the NW Pacific Magellan seamount were taken at 5 mm intervals. The concentration profiles of ore-forming and rare earth elements show that obvious differences exist between young unphosphatized crusts and old phosphatized crusts. In the old crusts Fe, Mn, Si, Al, Zn, Mg, Co, Ni and Cu elements are depleted and Ca, P, Sr, Ba and Pb elements are enriched. The order of depletion is Co > Ni > Mg > Al > Mn > Si> Cu > Zn > Fe, while the order of enrichment is P > Ca > Ba > Pb > Sr. The phosphate mineral controls the concentration variation of the ore-forming elements in crusts and causes loss of the main ore-forming elements such as Co and Ni. The phosphatization also affects the abundance of REEs in the crusts. REEs are more abundant and the content of Ce in old crusts is higher than that in young crusts, however, the pattern of REEs and their fractionation characteristics in new and old crusts are not fundamentally changed. A Y-positive anomaly in old crusts has no relationship to the phosphatization.
LI Guowu , YANG Guangming , MA Zhengsheng , SHI Nicheng , XIONG Ming , FAN Haifu , SHENG Ganfu China University of Geosciences
2005, 79(3).
Abstract:1 Introduction Chevkinite groups can be assigned to the chevkinite-(Ce) subgroup and perrierite-(Ce) subgroup in accord with the angle β : β ≈ 100o for the chevkinite subgroup and β ≈ 113o for the perrierite subgroup. Chevkinite-(Ce), polykovite-(Ce) and Maoniupingite (new mineral No. 017 of 2003) belong to the former subgroup, while renjeite and matsubaraite belong to the latter group. As strontio-chevkinite is a Sr-analogue of perrierite, usually the natural chevkinite-(Ce) group min…
CHEN Tao , CHEN Daizhang , WANG Hejin Key Laboratory of Orogenic Belts , Crustal Evolution
2005, 79(3).
Abstract:1 Introduction Micas are a series of layer silicates (phyllosilicates). Many clay minerals, such as muscovite, celadonite, illite, phengite, belong to the mica series and possess the same basic crystallographic symmetries. Illite is a kind of micas whose unit structure consists of one octahedral sheet in between two opposing tetrahedral sheets. These sheets form a basic 2:1 layer that is linked by interlayer cations. Mica twinnings and twin laws (Donnay et al., 1964; Rieder, 1970) have been …
2005, 79(3):i001-i001.
Abstract:
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