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Geochemistry and Sr-Nd-Pb-Hf isotopes of Early Cretaceous basalts from the Great Xinggan Range,NE china:Implications for their origin and mantle source characteristics

Geochemistry and Sr-Nd-Pb-Hf isotopes of Early Cretaceous ba...

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中国科学院地质与地球物理研究所2008学术年会

作者： Lian-chang Zhang~(a,*),Xin-hua Zhou~b,Ji-feng Ying~b,Fei Wang~b,Feng Guo~c,Bo Wan~a,Zhi-guang Chen~a a key laboratory of Mineral resources,institute of Geology and Geophysics,chinese academy of sciences,P.O.BOX 9825,Beijing 100029,china b state key laboratory of Lithospheric evolution,institute of Geology and Geophysics,chinese academy of sciences,Beijing 100029,china c Guangzhou institute of Geochemistry,chinese academy of sciences,Guangzhou 510640,china

Late Mesozoic volcanism is widespread throughout northeastern china,mainly clustering in the Great Xinggan Range,where the major period of volcanic eruption was during the Early *** spatial distribution of volcanic rocks shows a NNE-extending *** lithology of Mesozoic basaltic rocks in the Great Xinggan Range ranges from trachytic basalts,basalts to basaltic *** the basis of lithological associations and spatial relationships,we divide the basalts into four groups,***,Genhe,Zalute and *** Early Cretaceous volcanism in the Great Xinggan Range is characterized by significant large ion lithophile elements(LILE) and light rare earth elements(LREE) enrichment and high field strength elements(HFSE) depletion,with a slightly enriched to depleted Nd-Hf and weakly enriched Sr isotopic compositions(initial Sr/Sr=0.7046-0.7079,ε(t)=+3,6 to - 6.9 andε(t)=+3.9 to -4.6).The Pb isotopic compositions are also variable with Pb/Pb,Pb/Pb and Pb/Pb values of 17.791-18.530,15.477-15.597 and 37.761-38.497,*** Sr-Nd-Pb-Hf isotopic data indicate that the rnagmatic sources are heterogeneous,showing an enriched to depleted signature of continental lithospheric *** rnagmatic sources of the Genhe and Zalute groups are characterized by mixing among PM,EM II and DM,whereas the Tahe and Xiwu groups derive from enriched lithospheric mantle that had experienced metasomatism by fluids or melts from subducted Paleo-Asian and Mongol-Okhotsk ocean slabs and possible influence of Precambrian *** Late Mesozoic volcanic rocks in the Great Xinggan Range resemble those of the Cenozoic calc-alkaline magmatism in the Basin and Range Province of the United *** therefore suggest that the widespread Mesozoic volcanic rocks in the Great Xinggan Range were generated in an extensional tectonic setting.

关键词： Element geochemistry Sr-Nd-Pb-Hf isotope Basaltic rocks Early Cretaceous Extensional setting Great Xinggan Range NE china

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A hydrocarbon enrichment model and prediction of favorable accumulation areas in complicated superimposed basins in china

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Petroleum Science 2010年第1期7卷 10-19页

作者： Pang Xiongqi Meng Qingyang Jiang Zhenxue Liu Luofu Lu Xiuxiang state key laboratory of Petroleum resources and Prospecting China University of Petroleum Beijing 102249 China Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China Research institute of Petroleum Exploration and Development PetroChina Beijing 100083 China

The geologic conditions of superimposed basins in china are very complicated. This is mainly shown by multi-phase structural evolution, multiple sets of source-reservoir-cap rock combinations, multiple stages of hydrocarbon generation and expulsion from source rocks, multi-cycle hydrocarbon enrichment and accumulation, and multi-phase reservoir adjustment and reconstruction. The enrichment, accumulation and distribution of hydrocarbon is mainly controlled by the source rock kitchen, paleo- anticline, regional cap rock and intensity of tectonic movement. In this paper, the T-BCMS model has been developed to predict favorable areas of hydrocarbon accumulation in complicated superimposed basins according to time and spatial relationships among five key factors. The five factors include unconformity surface representing tectonic balancing （B）, regional cap rock representing hydrocarbon protection （C）, paleo-anticline representing hydrocarbon migration and accumulation （M）, source rock kitchen representing hydrocarbon generation and expulsion （S） and geological time （T）. There are three necessary conditions to form favorable areas of hydrocarbon accumulation. First, four key factors BCMS should be strictly in the order of BCMS from top to bottom. Second, superimposition of four key factors BCMS in the same area is the most favorable for hydrocarbon accumulation. Third, vertically ordered combination and superimposition in the same area of BCMS should occur at the same geological time. The model has been used to predict the most favorable exploration areas in Ordovician in the Tarim Basin in the main hydrocarbon accumulation periods. The result shows that 95% of the discovered Ordovician hydrocarbon reservoirs are located in the predicted areas, which indicates the feasibility and reliability of the key factor matching T-BCMS model for hydrocarbon accumulation and enrichment.

关键词： Complicated superimposed basin key factor matching T-BCMS model favorable area for hydrocarbon accumulation hydrocarbon distribution prediction

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Precambrian key tectonic events and evolution of the North china craton

Precambrian key tectonic events and evolution of the North C...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： MINGGUO ZHAI~(1,2),TIE-SHENG LI~(1,2),PENG PENG~(1,2),BO HU~(1,2),FU LIU~(1,2) & YANBIN ZHANG~(1,2) 1 state key laboratory of Litho spheric evolution,institute of Geology and Geophysics, chinese academy of sciences,PO Box 9825,Beijing,100029,china 2 key laboratory of Mineral resources,institute of Geology and Geophysics, chinese academy of sciences,PO Box 9825,Beijing,100029,china

The North china craton(NCC)is one of oldest cratons in the world,with crust up to c.3.8 Ga old,and has a complicated *** main Early Precambrian geological events and key tectonic issues are as follows.(1)Old continental nuclei have been recognized in the NCC,and the oldest remnants of granitic gneiss and supracrustal rocks are 3.8 Ga *** main crustal growth in the NCC took place at 2.9-2.7 *** NCC can be divided into several microblocks,which are separated by Archaean greenstone belts that represent continental accretion surrounding the old continental nuclei.(2)By 2.5 Ga,the microblocks amalgamated to form a coherent craton by continent-continent,arc-continent or arc-arc *** tectonic processes in Neoarchaean and modern times appear to differ more in degree than in principle. Extensive intrusion of K-granite sills and mafic dykes and regional upper amphibolite-to granulite -facies metamorphism occurred,and marked the beginning of cratonization in the NCC. Coeval ultramafic-mafic and syenitic dykes of c.2500 Ma in Eastern Hebei indicate that the NCC became a stable,thick and huge continent at the end of the Archaean,and probably was a part of the Neoarchaean supercontinent that has been suggested by previous studies.(3)In the period between 2500 and 2350 Ma,the NCC was tectonically inactive,but the development of a Palaeoproterozoic volcanic and granitic rocks occurred between 2300 and 1950 *** volcanic -sedimentary rocks are termed Palaeoproterozoic mobile belts;these have a linear distribution, and were affected by strong folding and metamorphism at 1900-1850 Ma,and intruded by granites and pegmatites at 1850-1800 *** Palaeoproterozoic mobile belts formed and evolved within the craton or continental margin(epicontinental geosyncline).Some 2.30-1.95 Ga rift-margin, passive continental margin deposits,analogous arc or back-arc assemblages,as well as HP and HT-UHT metamorphic complexes seem to be comparable with many in the late Phane

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Geological and geochemical characteristics and ore genesis of the Keketale VMS Pb-Zn deposit,Southern Altai Metallogenic Belt,NW china

Geological and geochemical characteristics and ore genesis o...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Bo Wan~(a,b,*),Lianchang Zhang~a,Wenjiao Xiao~b a key laboratory of Mineral resources,institute of Geology and Geophysics,chinese academy of sciences,P.O.Box 9825,Beijing 100029,P.R.china b state key laboratory of Lithospheric evolution,institute of Geology and Geophysics,chinese academy of sciences,P.O.Box 9825,Beijing 100029,P.R.china

The Keketale Pb-Zn volcanogenic massive sulfide(VMS)deposit occurs in the early Devonian sequence of the Kangbutiebao Formation of the Southern Altai Metallogenic Belt(SAMB),northern Xinjiang,*** the orebodies are stratabound and hosted by a suite of meta-sedimentary rocks intercalated with volcanic *** sulfide ores are pyrite,sphalerite,galena,with minor pyrrhotite and rare ***, banded,and disseminated ores are the three main types.A typical VMS-type hydrothermal alteration zone is developed around the *** of the overturned strata,an intense chlorite-,pyrite-rich crosscutting feeder zone is present immediately above the orebody.A sericite zone envelopes the chlorite *** meta-volcanic rocks show decoupled characteristics between the high field strength elements(Ta, Zr,and Hf)and large ion lithophile elements(Rb,Ba,and Th);all samples plot in the volcanic arc field in Ta *** discrimination ***δS values of the stockwork zone are-1.0 to 4.5‰,and those of banded or massive ores range from-11.1 to-8.8‰,indicating that hydrothermal fluids may have had multiple sources and that bacterial sulfate reduction probably played an important ***(Sr/Sr) ratios andε(t)values of sulfide ores range from 0.70351 to 0.70951 and-3.6 to +3.0,respectively,whereas the corresponding values for wall rocks are 0.70560 to 0.70967 and-3.6 to + *** a Sr-Nd isotopic correlation diagram,all the ores,meta-sedimentary rocks and volcanic rocks plot close to one another,clearly indicating a mixed mantle-crust *** isotopic compositions of the ores are 17.995 to 18.232 for Pb/Pb, 15.498 to 15.669 for Pb/Pb and 37.725 to 38.296 for Pb/Pb,withμ(U/Pb)ranging from 9.3 to *** Pb isotopes show a wide range in a Pb-Pb diagram,and the high Pb/Pb values in the ores show distinctive crustal contamination signatures;a mixed mantle-crustal source is thus *** element geochemistry data are consistent with the Sr-Nd and Pb is

关键词： chinese Altai VMS deposit Keketale Pb-Zn deposit Back-arc basin

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The vegetation and climate change during Neocene and Early Quaternary in Jiuxi Basin, china

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Science china Earth sciences 2005年第5期 676-688页

作者： MA Yuzhen 1 , FANG Xiaomin 1,2 , LI Jijun 1 , WU Fuli 1 & ZHANG Jun 1 1. key laboratory of Western china’s Environmental Systems and College of resources and Environment, Lanzhou University, Lanzhou 730000, china 2. state key laboratory of Loess and Quaternary Geology, institute of Earth Environment, chinese academy of sciences, Xi’an 710075, china

Sporopollen record in the Laojunmiao Section at Yumen in the Hexi Corridor foreland depression at the northern margin of the Tibetan Plateau revealed that during the period of 13.0―11.15 Ma the ecological environment of the Jiuxi Basin is characterized by steppe vegetation and a semi-moist climate. During 11.16―8.60 Ma prevailed forests of cypress and a still warmer, moister climate; steppe vegetation and dry climate began probably at about 8.6 Ma. Although aridification had been relaxed time and again during 8.40―6.93 Ma (forest-steppe, warm-semi-moist), 6.64―5.67 Ma (open-forest and steppe, warmer-semi-moist) and 5.42―4.96 Ma (steppe, semi-arid), the climate in the region became drier and drier in response to the fre- quent occurrence of aridity during 6.93―6.64 Ma (steppe, semi-arid), 5.67―5.42 Ma (de- sert-steppe, arid), 3.66―3.30 Ma (desert-steppe, arid) and 2.56―2.21 Ma (desert, arid). Perhaps the important findings of our study are the notable expansion of drought-enduring plants during 3.66―3.30 Ma and about 2.56 Ma and the replacement of vegetation by vast arid desert.

关键词： Tibetan Plateau Hexi Corridor sporopollen record ecological environment vegetation evolution aridific-ation.

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Depositional characteristics and petroleum geological significance of wetland

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Petroleum Science 2009年第4期6卷 347-353页

作者： Jin Zhenkui Gu Junfeng Su Nina Wang Zhaofeng Huang Xiaoping state key laboratory of Hydrocarbon resources and Exploration China University of PetroleumBeijing 102249China Research institute of Petroleum Exploration and Development Xinjiang Oilfield CompanyPetroChinaKaramayXinjiang 834000China

Wetland is a new type of sedimentary facies proposed for the first time in this paper. It is a type of sedimentary environment, transitional between land facies and water (sea or lake) facies. In this paper, wetland is redefined as “a type of sedimentary environments whose ground surface is flat and wet throughout the year, which may be covered with very shallow water (less than 2 m deep), and is covered with lush plant growth”. Wetland is reclassified into two types, swamp wetland (swamp in brief) and wet plain wetland (wet plain in brief). Swamp deposits are coal, while wet plain deposits are dark colored mudstones or silty mudstones rich in plant fossils and carbon debris. The deposits of wet plain are different from those of lake and floodplain in the abundance of plant fossils, color, resistivity well logging curve, and other sedimentary characteristics. In boreholes, resistivity logging can be used to distinguish between wet plain mudstones and lake mudstones. Understanding the sedimentary characteristics of wet plain wetland can help to identify wet plain deposits which were formerly classified as floodplain or lake deposits. This will help to reconstruct the palaeogeography and to understand the history of basin and climate evolution accurately, and is especially important in evaluation of the hydrocarbon generating potential of a basin. With the Jurassic Sangonghe Formation of the Yanqi Basin as an example, the identification characteristics of wetland are described.

关键词： Wetland wet plain Yanqi Basin Sangonghe Formation of Jurassic braided river delta

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Lower crustal processes leading to Mesozoic lithospheric thinning beneath eastern North china:Underplating,replacement and delamination

Lower crustal processes leading to Mesozoic lithospheric thi...

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中国科学院地质与地球物理研究所2007学术年会

作者： Mingguo Zhai~(a,b,d,*),Qicheng Fan~c,Hongfu Zhang~(a,d),Jianli Sui~a,Ji’an Shao~e a institute of Geology and Geophysics,chinese academy of sciences,Beijing,100029,china b key laboratory of Mineral resources.chinese academy of sciences,Beijing,100029,china c institute of Geology,chinese Seismological Bureau.Beijing,100029,china d state key laboratory of Lithosphere Tectonic evolution,Beijing,100029,china c School of Earth and Space sciences,Peking University,Beijing,100871,china

Our recent studies show that the lower crust and lithospheric mantle in the eastern North china Craton(NCC) was thinned in the *** lower crust played a key role in the tectonic mechanism that led to lithospheric *** data from volcanic rocks and xenoliths support the idea that delamination of the lower crust and lithospheric mantle took place only along the northern and perhaps the southern margins of the NCC,and this was linked to post-collisional orogenic ***,it is difficult for the delamination process to act on the whole eastern NCC and remove 80-120 km of the *** crustal xenoliths in Mesozoic and Cenozoic basalts within the NCC arc of two *** is granulite-facies metamorphosed two pyroxene gabbros and eclogite-facies metamorphosed garnet pyroxenites formed at 140-120 *** other is Precambrian granulites that were strongly overprinted by Mesozoic ***-scale lower crustal replacement took place in the Mesozoic beneath the *** other words,some or perhaps most part of the present lower crust of the NCC is not *** present lowermost crust is mostly composed of Mesozoic meta-gabbros and *** late Jurassic,high-Sr granites in the NCC,which are compositionally similar to a dakite,probably formed by partial melting of the lowermost crust,leaving a residue of eclogite or garnet amphibolite.A hot upwelling mantle was necessary to partially melt the pre-existing lowermost crust and underplate magma in order to form the present lower *** eclogites could sink into the mantle,it is hard to imagine that there was a thick enough eclogite layer that could drag 80-120 km of the lithosphere into the asthenosphere beneath the NCC. Magmatic underplating seems to be a better alternative ***,the formation of the present lower crust through the underplating and replacement of the pre-existing one was closely related to lithospheric thinning,and represented a con

关键词： Lower crustal processes:Underplating Dclamination Lithospheric thinning North china

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An overview of the crustal structure of the Tibetan plateau after 35 years of deep seismic soundings

An overview of the crustal structure of the Tibetan plateau ...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Zhongjie Zhang~(a,*),Yangfan Deng~(b,c),Jiwen Teng~a,Chunyong Wang~d,Rui Gao~e,Yun Chen~a,Weiming Fan~b a state key laboratory of Lithospheric evolution,institute of Geology and Geophysics,chinese academy of sciences,Beijing 100029,china b Guangzhou institute of Geochemistry,chinese academy of sciences,Guangzhou 510640,china c Graduate University of chinese academy of sciences,Beijing 100049,china d institute of Geophysics,china Earthquake Administration,Beijing 100081,china e institute of Geology,chinese academy of Geological sciences,Ministry of Land and resources,Beijing 100037,china

Since the pioneer wide-angle seismic profile along the Yadong-Gulu rift acquired in 1974 by the ex-institute of Geophysics,chinese academy of sciences(CAS),several research programs aimed to deep geophysics, performed thanks to the participation of chinese national and international institutions,have been developed during last 35 years,including 23 wide-angle seismic profiles with total length of about 6000 *** profiles are unevenly distributed,most of them in eastern Tibet and few profiles in western *** this paper,we make a summarized presentation of all these wide-angle seismic profiles and provide an overall view of the seismic velocity structure of the crust beneath the broad Tibetan plateau, which is the product of the continuous convergence and collision of the Indian and Eurasian plates since about 50 Ma *** patterns of crustal thickness variation related to the tectonic blocks and along suture zones of the region are *** crust thickness is confirmed to be about 70-75 km under southern Tibet,and 60-65 km under northern,northeastern and southeastern *** leading edge of the subducted lithosphere reaches the northern margin of the plateau and directly contacts with Tarim *** of the 90°E boundary,the Indian crust is moving towards the northern edge of the plateau and collides with Tarim Basin at 80°E while reach the Bangong-Nujiang suture belt at 88°E;eastward of the 90°E boundary,the northern edge of the crust should be at 50-100 km south of Bangong-Nujiang *** results supply helpful constrains to understand the mechanism of the continent-continent collision and its consequences in the plateau and neighbouring areas.

关键词： Wide-angle seismic profiling Crustal thickness Tibetan plateau

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Environmental Redox Changes of the Ancient Sea in the Yangtze Area during the Ordo-Silurian Transition

Environmental Redox Changes of the Ancient Sea in the Yangtz...

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中国科学院地质与地球物理研究所2008学术年会

作者： YAN Detian~(1,2,*),CHEN Daizhao~1,WANG Qingchen~1,WANG Jianguo~1 and CHU Yang~1 1 state key laboratory of Lithospheric evolution,institute of Geology and Geophysics,chinese academy of sciences,Beijing 100029 2 key laboratory of Tectonics and Petroleum resources,china University of Geosciences, Ministry of Education,Wuhan 430074

Extensive organic-matter(OM) rich facies(black shales) occur in the Ordo-Silurian boundary successions in the Yangtze area,South *** investigate the redox changes of the Yangtze Sea during the Ordo-Silurian transition,two OM sections(Wangjiawan in Yichang,Hubei Province,and Sanjiaguan in Zhangjiajie,Hunan Province) straddling the Ordo-Silurian boundary are *** measurements finished in this study include contents of the total organic carbon(TOC), pyrite sulphur,and different species of Fe,including dithionite-extractable Fe(Fe),pyrite Fe(Fe), HCl-extractable Fe(Fe),and total Fe(Fe),in black shales,as well as other redox proxies,such as the S/C ratio,the ratio between highly reactive Fe(Fe= Fe+ Fe) and Fe,and the Fe/(Fe + Fe) ratio, known as the degree of pyritization(DOP).In the Wangjiawan section,the Middle Ashgill sediments have high Fe/Fe ratios(0.20-0.77;avg.0.45),high DOP values(0.21-0.72;avg.0 54),and a relatively constant sulfur content independent of the organic carbor *** she contrast,the mid-early Hirnantian deposits generally have low Fe/Fe ratios(0.10-0.35;avg.0.21),low DOP values(0.11- 0.40;avg.0.28),and S/C values are clustering on the normal marine value(S/C = 0.36).The late Hirnantian and early Rhuddanian Jeposits,similar to those of the Middle Ashgill deposits,are characterized by high Fe/Ve ratios(0.32-0.49;avg.0.41),high DOP values(0.46-0.68;avg.0.53) and fairly constant sulfur mm *** data suggest the occurrences of marine anoxia on the Yangtze Sea shelf during intervals of the Mid Ashgill,Late Hirnantian and Early Rhuddanian,and ventilated and oxygenated marine conditions during the mid-early Hirnantian *** mid-early Hirnantian ventilated event was concomitant with the global glacial period,likely resulted from the glacio-eustatic sea-level fall and subsequent circulation of cold,dense oxygenated waters upon the shelf seabed. Accordingly,the abrupt change from oxygenated to anoxic marine waters from the late Hirnan

关键词： oceanic anoxia water column stratification Fe-S geochemistry organic carbon Late Ordovician Early Silurian Yangtze Sea South china

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Upper mantle P-wave tomography across the Longmenshan fault belt from passive-source seismic observations along Aba-Longquanshan profile

Upper mantle P-wave tomography across the Longmenshan fault ...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Zhiming Bai~(a,*),Xiaobo Tian~a,You Tian~b a state key laboratory of Lithospheric evolution,institute of Geology and Geophysics,chinese academy of sciences,Beijing 100029,china b Department of Geophysics,Jilin University,Changchun 130026,china

A passive seismic experiment across the Longmenshan(LMS) fault belt had been conducted between August 2006 and July 2007 for the understanding of geodynamic process between the Eastern Tibet and Sichuan *** herein collected 3677 first P arrival times with high precision from seismograms of 288 teleseismic events so as to reconstruct the upper mantle velocity *** results show that the depth of the Lithosphere-asthenosphere boundary(LAB) changes from 70 km beneath Eastern Tibet to about 110 km beneath Longquanshan,Sichuan Basin,which is consistent with the receiver function imaging *** very thin mantle part of the lithosphere beneath Eastern Tibet may suggest the lith-osphere delamination due to strong interaction between the Tibetan eastward escaping flow and the rigid resisting Sichuan basin,which can be further supported by the existences of two high-velocity anomalies beneath LAB in our imaging *** also find there are two related low-velocity anomalies beneath the LMS fault belt,which may indicate magmatic upwelling from lithosphere delamination and account for the origin of tremendous energy needed by the devastating Wenchuan earthquake.

关键词： Upper mantle Traveltime tomography Longmenshan fault belt Velocity anomaly Wenchuan earthquake

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