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^(207)Pb/^(206)Pb Zircon Dating of the Huangtuling Hypersthene-Garnet-Biotite Gneiss from the Dabie Mountains, Luotian County, Hubei Province, China: New Evidence for Early Precambrian Evolution

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Acta Geologica Sinica(English Edition) 1999年第1期73卷 78-83,127-128页

作者： JIAN Ping YANG Weiran and zhang Zichao institute of Geology,CAGS,26 Baiwanzhuang Rd, beijing 100037 China University of Geosciences, Wuhan, Hubei 430074 Yichang institute of Geology and mineral Resources, CAGS, Yichang, Hubei 443003 institute of Geology CAGS 26 Baiwanzhuang Rd Beijing 100037 China University of Geosciences Wuhan Hubei 430074 Yichang institute of Geology and mineral Resources CAGS Yichang Hubei 443003

The Huangtuling hypersthene-garnet-biotite gneiss at Luotian County, Hubei Provine, is a typicalgranulite-facies rock of the Dabie Group Complex in the Dabie orogenic belt. Investigations on the morphology andoccurrence of zircons and their internal structures shown in the thin sections lead to the recognition of three types ofzircons, which are in good agreement with the types identified on the basis of morphology, colour and external fea-tures from the related zircon concentrates. The observation of zircons in the rock reveals that part of type 1 zirconsshow signs of a double-layered structure. The interval part existed in the protolith prior to the granulite-facies meta-morphism. Type 2, the prismatic zircons which mainly occur in garnet and hypersthene are metamorphic minerals ofthe granulite-facies metamorphism. Type 3, the round multifaceted zircons in felsic minerals and biotite, are proba-bly attributed to a later geological event related to migmatization. The ^(207)Pb/^(206)Pb zircon dating by direct evaporationon (thermal evaporation ion mass spectrometer) yields ages ranging from 2814 Ma to 1992 Ma. The age discrepancyamong these different zircon types is conspicuous. The yellow-brown(type 1) zircons give ages of 2814±29 Ma to2527±6 Ma, the prismatic euhedral zircons (type 2), 2456±7 Ma to 2254±4 Ma, and the round multifaceted zircons(type 3), 1992±10 Ma. The results are geologically interpreted in consideration of the complicated behaviours of zir-cons during Precambrian geological evolution of the Dabie area. (1) If the protolith of the gneiss is a sedimentaryrock, then type 1 zircons are clastic ones and the ages 2814±29 Ma and 2811±27 Ma may reflect the minimum age ofthe rocks of its source region. also the first geological event in the area. Sedimentation of the protolith occurred be-tween 2814 Ma and 2527 Ma, probably close to 2814 Ma. If the protolith is a volcanic rock, then the formation age ofthe supracrustal rocks of the Dabie Group Complex is

关键词： Dabie Mountains granulite facies Archaean multistage evolution zircon 207~Pb/206~Pb

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3D MODE LING AN D VISUA LIZATION OF GEOLOGY VOLUME BASED ON GEOPHYSICAL FIELD DATA

3D MODE LING AN D VISUA LIZATION OF GEOLOGY VOLUME BASED ON ...

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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： Min Qi,Bao-lin zhang,Guang-he Liang,Jie Wang,Xin-ping Cai Division of Solid mineral Resource,institute of Geology and Geophysics,chinese academy of sciences,beijing 100029,China.

3D modeling and visualization of geology volume is very important to interpret accurately and locate subsurface geology volume for mining exploration and deep ***,it faces a lack of information because the target area is usually unexplored and lacks geological *** paper presents our experience in applying a 3D model of geology volume based on *** work has researched and developed a 3D visualization *** is based on an OO(orientated object) approach and modular programming,uses the C language and *** *** system has built first a high resistivity method and MT *** system uses irregular tetrahedrons to construct its model and then finally has built the 3D geological model itself.

关键词： Geology volume 3D visualization Modeling method Tetrahedron

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Petrogenesis and Tectonic Implications of the Paleoproterozoic A-Type Granites in the Xiong’ershan Area along the Southern Margin of the North China Craton

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Journal of Earth Science 2024年第2期35卷 416-429页

作者： Jinhong Xu Yuping Jiang Shuli Hu Zhengwei zhang Chengquan Wu Chaofei Zheng Xiyao Li Ziru Jin Sensen zhang Yatao Zhou State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550081China University of chinese academy of sciences Beijing100049China Henan Province Non-ferrous Metals geological mineral Resources Bureau Zhengzhou450053China Jiangmen Land Market Monitoring Center Jiangmen 529000China

Paleoproterozoic A-type granites are widely distributed in the southern margin of the North China Craton(SNCC),providing important information for understanding the Paleoproterozoic tectonic regimes in this *** paper reports newly obtained whole-rock compositions and zircon U-Pb ages for the Tieluping syenogranite porphyry(TLP)and Huoshenmiao alkali granite porphyry(HSM)in the *** from the TLP and HSM have U-Pb ages of 1805±12 and 1792±14 Ma,*** ages are taken to date the emplacement of these *** had high total alkali contents(K_(2)O+Na_(2)O>7.13 wt.%),with high 10000×Ga/Al ratios(3.06–3.41)and Zr+Y+Nb+Ce values(709 ppm–910 ppm)as well as high zircon saturation temperatures(864–970℃),indicative of A-type granite *** Y/Nb(1.75–3.32),Ce/Nb(7.72–9.72),and Yb/Ta(2.89–5.60)ratios suggested that TLP and HSM belonged to the A2-type *** negative whole rockε_(Nd)(t)values(−8.4 to−6.6)and negative zirconε_(Hf)(t)values(−15.9 to−6.3)confirmed that TLP and HSM were likely generated by the partial melting of an ancient continental ***εHf(t)(−7.4 to+4.0)values of inherited zircons in the TLP suggested that they were derived from the partial melting of Archean basement *** the geochemical similarity of the 1.80 Ga A-type granitoids in the SNCC,we propose that the TLP and HSM were formed in a post-collisional regime that was likely associated with the break-off of the Paleoproterozoic subducted *** of the asthenosphere provided huge heat to generate the regional 1.80 Ga A-type granite in the SNCC.

关键词： Paleoproterozoic A-type granite Post-collisional North China Craton tectonic geochemistry

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Petrogenesis of Triassic post-collisional syenite plutons in the Sino-Korean craton:an example from North Korea

Petrogenesis of Triassic post-collisional syenite plutons in...

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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： PENG PENG * +§,MINGGUO ZHAI* +,JINGHUI GUO* +,HUAFENG zhang(?) & YANBIN zhang + * Key Laboratory of mineral Resources,institute of Geology and Geophysics,chinese academy of sciences, P.O.Box 9825,beijing 100029,China + State Key Laboratory of Lithospheric Evolution,beijing 100029,China (?) State Key Laboratory of geological Processes and mineral Resources,China University of Geosciences, beijing 100083,China

More than ten Triassic syenite plutons are revealed to be distributed in North Korea along the boundary to South *** Tokdal Complex is one of these but is unique in its incorporation of early pyroxenite cumulate in the clinopyroxene/amphibole/biotite/nepheline-bearing syenite main body.A SHRIMP U-Pb zircon age of 224±4 Ma was obtained from a biotite syenite sample. Clinopyroxene in pyroxenite is zoned,with either phlogopite and apatite inclusion or ilmenite and magnetite exsolution,and may have resulted from crystallization at high pressure in an active continental margin arc environment followed by ascent and *** pyroxenite and syenite are enriched in light REE and LILE,but strongly depleted in HFSE,with Sr/860Sr values of～0.7115 andεNd values of -14 to -20(t = 224 Ma).The Tokdal Complex could have originated from an enriched lithospheric mantle and undergone assimilation of juvenile materials during differentiation. It indicates an extension of post-collisional magmatism in the Sino-Korean *** complex along with many other Triassic plutons in the Sino-Korean craton together constitute three syenite belts along the northern,southern and eastern margins of the craton,possibly resulting in its final configuration in eastern Asia.

关键词： North China North Korea Triassic syenite

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Hydrocarbon accumulation in network and its application in the continental rift basin

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Science China Earth sciences 2008年第S2期51卷 88-100页

作者： PANG XiongQi1,2,CHEN DongXia1,zhang ShanWen3,HAO Fang1,LIU Zheng1,LIU KeYu3,SONG GuoQi4,WANG YongShi4,LUO XiaoRong5 & WU XiaoChun61 State Key Laboratory of Petroleum Resource and Prospecting,chinese University of Petroleum,beijing 102249,China 2 Basin and Reservoir Center,chinese University of Petroleum,beijing 102249,China 3 SINOPEC Shengli Oilfield,Dongying 257051,China 4 CSIRO Petroleum,P. O. Box 1130,Bentley,WA 6102,Australia 5 institute of Geology and Geophysics,chinese academy of Science,beijing 100029,China 6 China National Petroleum Corporation,beijing 100724,China chinese Univ Petr State Key Lab Petr Resource & Prospecting Beijing 102249 Peoples R China chinese Univ Petr Basin & Reservoir Ctr Beijing 102249 Peoples R China SINOPEC Shengli Oilfield Dongying 257051 Peoples R China CSIRO Petr Bentley WA 6102 Australia chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China China Natl Petr Corp Beijing 100724 Peoples R China

The concept of hydrocarbon accumulation in network was presented on basis of the overall analysis of the formation and evolution characteristics of the continental faulted basin and of the systemic re-search on the major controlling factors on the hydrocarbon accumulation. The hydrocarbon accumu-lation in network can be defined as hydrocarbon accumulation in a three-dimensional network system which is constituted by the hydrocarbon migration passages under multiple dynamics,following the hydrocarbon generation from source rocks. The research shows that the hydrocarbon accumulation in network is composed of four elements,i.e.,hydrocarbon source (source rock kitchen),hydrocarbon accumulation terminal (trap),network pathway connecting source and terminal (transporting system),and network potential driving hydrocarbon migration in the network pathway (migration dynamics). Compared with other networks,hydrocarbon accumulation in network has three basic characteristics: the irreversible geological process of material and information flow in the network; the loss of material and information in the flow process in the network; the multiple dynamics in the flow process. Interac-tion of all the elements in the geological process can be called hydrocarbon accumulation in network. There are three basic models for hydrocarbon accumulation in network,that is,hydrocarbon accumu-lation in the network source area,hydrocarbon accumulation in the network pathway,and hydrocarbon accumulation in the network terminal. The key in the application of the hydrocarbon accumulation models in network in practice is to confirm the major accumulation stage and the function range of the four elements controlling the hydrocarbon firstly,to predict the profitable accumulation region by su-perposition of the favorable areas confirmed by four elements consequently,and to evaluate the oil-bearing property of the trap as well as confirm drilling targets. This paper takes the Dongying De-pression in the

关键词： continental rift basin hydrocarbon accumulation theory hydrocarbon network hydrocarbon accumulation in network Bohai Bay Basin

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Rb－Sr ISOTOPE DATING ON FENITES FROM BAYANOBO，INNERMONGOLIA，CHINAAND THEIR geologicalIMPLICATIONS

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Scientia Geologica Sinica 1994年第4期 457-467页

作者： Yang Xueming(Department of Earth and Space sciences, China University of Science and Technology, Hefei 230026) zhang Peishan Tao Kejie zhang Rengu(institute of Geology, chinese academy of sciences beijing 100029)Yang Xiaoyong(Department of Earth and Spa

Ｒｂ－ＳｒＩＳＯＴＯＰＥＤＡＴＩＮＧＯＮＦＥＮＩＴＥＳＦＲＯＭＢＡＹＡＮＯＢＯ，ＩＮＮＥＲＭＯＮＧＯＬＩＡ，ＣＨＩＮＡＡＮＤＴＨＥＩＲＧＥＯＬＯＧＩＣＡＬＩＭＰＬＩＣＡＴＩＯＮＳＹａｎｇＸｕｅｍｉｎｇ（Ｄｅｐａｒｔｍ... 详细信息

Ｒｂ－ＳｒＩＳＯＴＯＰＥＤＡＴＩＮＧＯＮＦＥＮＩＴＥＳＦＲＯＭＢＡＹＡＮＯＢＯ，ＩＮＮＥＲＭＯＮＧＯＬＩＡ，ＣＨＩＮＡＡＮＤＴＨＥＩＲＧＥＯＬＯＧＩＣＡＬＩＭＰＬＩＣＡＴＩＯＮＳＹａｎｇＸｕｅｍｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＥａｒｔｈａｎｄＳｐａｃ...

关键词： Rb INNERMONGOLIA CHINAAND THEIR geologicalIMPLICATIONS Sr ISOTOPE DATING ON FENITES FROM BAYANOBO

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Environmental evolution recorded by lipid biomarkers from the Tawan loess-paleosol sequences on the west chinese Loess Plateau during the late Pleistocene

Environmental evolution recorded by lipid biomarkers from th...

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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： Fangming Zeng·Shuyuan Xiang·Kexin zhang·Yulin Lu institute of Geology and Geophysics,Graduate University, chinese academy of sciences,Box 9825,beijing 100029,China Faculty of Earth sciences,State Key Lab of geological Processes and mineral Resources,China University of Geosciences,Wuhan 430074,China Development and Research Center,China geological Survey, beijing 100037,China

This study provides a reconstruction of the environmental evolution since 128 ka recorded by the lipid biomarkers of the C-C n-alkanes,the C-C n-alkan- 2-ones and the C-C n-alkanols isolated from the Tawan loess section,Northwest *** in paleoenvironment are reconstmcted from the values of the carbon preference index(CPI),the average chain length(ACL), the L/H(ratio of lower-molecular-weight to higher-molecular -weight homologues),the n-alkane C/C ratios,and the n-alkan-2-one C/C *** parameters indicate the dominance of grasses over the west chinese Loess Plateau(CLP) during the late Pleistocene. Lower values of the CPI and the ACL values,respectively, indicate stronger microbial reworking of organic matter and changes in plant species,which are both indicative of a warmer-wetter ***,the fluctuations of environment recorded in the Tawan section exhibit ten phases that show obvious cycles between warm periods and cold *** study reveals that changes in the biomarker proxies agree well with changes in the magnetic susceptibility and grain size,and it indicates a huge potential for paleoenvironmental reconstructions by using the n-alkan-2-one and n-alkanol proxies.

关键词： Loess Lipid biomarker Linxia Late Pleistocene Earth environment

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A New Age Constraint on the Onset of the Neoproterozoic Glaciations in the Yangtze Platform,South China

A New Age Constraint on the Onset of the Neoproterozoic Glac...

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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： Qi-Rui zhang,Xian-Hua Li,~1 Lian-Jun Feng,Jing Huang,and Biao Song~2 State Key Laboratory of Lithospheric Evolution,institute of Geology and Geophysics, chinese academy of sciences,P.O.Box 9825,beijing 100029,China 1 Previous address:Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou institute of Geochemistry,chinese academy of sciences,Guangzhou 510640,China. 2 beijing SHRIMP Center,institute of Geology,chinese academy of geological sciences,beijing 100037,China.

A sample from the top of the Banxi Group(early Neoproterozoic) in Hunan Province(South China) was dated by the SHRIMP zircon U-Pb *** resulting age of 725±10 Ma probably solves the debate between the synglacial and the pregkcial correlation of the Liantuo Formation and indicates that the Liantuo Formation most likely correlates with the pregkcial Banxi *** the Banxi(Danzhou) Group is upwardly transitional to the glacial Jiangkou Group,the age becomes a new maximum age constraint on the onset of the Jiangkou glaciation,which therefore most likely correlates with the Sturtian glaciation.

关键词： Online enhancement:appendix table

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Numerical modeling of geothermal groundwater flow in karst aquifer system in eastern Weibei, Shaanxi Province, China

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Science China Earth sciences 2007年第S1期 36-41页

作者： LI Ming1, LI GuoMin1, YANG Liao2, DANG XueYa3, ZHAO ChunHu1, HOU GuangCai3 & zhang MaoSheng3 1 State Key Laboratory of Lithospheric Evolution, institute of Geology and Geophysics, chinese academy of sciences, beijing 100029, China 2 Xinjiang institute of Ecology and Geography, chinese academy of sciences, ürümqi 830011, China 3 Xi’an institute of Geology and mineral Resources, Xi’an 710054, China

The quantitative assessment of geothermal water resources is important to the exploitation and utilization of geothermal resources. In the geothermal water systems the density of groundwater changes with the temperature, therefore the variations in hydraulic heads and temperatures are very complicated. A three-dimensional density-dependent model coupling the groundwater flow and heat transport is established and used to simulate the geothermal water flow in the karst aquifers in eastern Weibei, Shaanxi Province, China. The multilayered karst aquifer system in the study area is cut by some major faults which control the regional groundwater flow. In order to calibrate and simulate the effect of the major faults, each fault is discretized as a belt of elements with special hydrological parameters in the numerical model. The groundwater dating data are used to be integrated with the groundwater flow pattern and calibrate the model. Simulation results show that the calculated hydraulic heads and temperature fit with the observed data well.

关键词： geothermal water numerical modeling fault karst aquifer system Weibei of Shaanxi Province

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AGE OF THE ALTYN TAGH STRIKE—SLIP FAULT

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地学前缘 2000年第S1期7卷 208-209页

作者： Li Haibing 1, Yang Jingsui 1, Xu Zhiqin 1, Wu Cailai 1, zhang Jianxin 1, Wan Yushen 1, Shi Rendeng 1, Juhn G. Liou 2,Trevor R. Ireland 2 (1 institute of Geology, chinese academy of geological sciences, beijing 100037, China 2 Department of

A 100～500m\|wide mylonite zone in the Altun Group of Lower Proterozoic age was discovered along the Altyn Tagh strike\|slip fault. The zone is mainly composed of amphibolitic and granitic mylonites. The planar joints of the rocks strike in NE70 and dip steeply (nearly vertical), coincident with the striking of Altyn Tagh fault zone, and their stretched lineations are nearly horizontal. Shear strains are well developed and show sinistral sheared. The amphibolitic and granitic mylonites are most probably the products of deep\|seated melting caused by sinistral strike\|slip shearing as suggested by the evidence below: (1) The migmatization is intensely developed and spatially controlled by the shear zone, and the rock has a set of NNE perspective foliation which is in accord with the direction of the Altyn Tagh strike\|slip fault zone. (2) The recrystallized hornblende aggregate is distributed in band with obvious nebulous texture, indicating the characteristics of anatexis, and the hornblendes are oriented and form the nearly horizontal stretching lineation; some hornblendes have titanite inclusions, and magmatic long\|columnar zircons are in directional arrangement.(3) The banded felsic material is developed, and the plagioclase is characteristic of high\|temperature plastic deformation and shows sinistral shear stain. (4) In mylonites, all the axis C fabric of quartz shows the feature of sinistral shearing and the majority is generally middle to low temperature fabric, but there also exists high temperature fabric, which suggests that high temperature shearing occur in the early stage of strike\|slip deformation and it is characterized by middle to low temperature shearing at the beginning of anatexis or in the late stage of the deformation. (5) On the XZ plane of mylonite and mylonitized rocks, there exists the consistent sinistral shear stain, which suggests the products of the same strike\|slip *** were separated from three samples of mylonitized gra

关键词： Altyn Tagh fault Tibet plateau SHRIMP dating mylonite

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