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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： junfeng Qin,~1 Min li,~2jun li,~1Rongyan Chen,~2Zhenhao Duan,~1Qiang Zhou,~2 Fangfei li,~(2,a))and Qiliang Cui~2 1 Key Laboratory of Earth’s Deep Interior,institute of geology and geophysics,chinese academy of sciences,beijing 10029,China 2 State Key Lab of Superhard Materials,Jilin university,Changchun 130012,China

The Brillouin scattering spectrosco.y studies have been co.ducted in a diamond anvil cell for a liquid mixtures co.posed of 95 mol%HO and 5 mol%co.under high temperatures and *** sound velocity,refractive index,density,and adiabatic bulk modulus of the HO + co.mixtures were determined under pressures up to the freezing point at 293,453,and 575 K. It is found from the experiment that sound velocities of the liquid mixture are substantially lower than those of pure water at 575 K,but not at lower *** presented an empirical relation of the density in terms of pressure and *** results show that liquid HO+co.mixtures are more co.pressible than water obtained from an existing equation of state of at 453 and 575 K.

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Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai-Tibetan Plateau

Paleoclimatic significance of mineral magnetic properties of...

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中国科学院地质与地球物理研究所2003学术年会

作者： WANG Xiaoyong~1,LU Huayu~1,li Zhen~2, DENG Chenglong~3,TAN Hongbing~4 & SONG Yougui~1 1.State Key Laboratory of Loess and Quaternary geology,institute of Earth Environment,chinese academy of sciences,Xi’an 710075, China 2.Department of Geography,Qinghai Normal university,Xining 810008, China 3.Paleomagnetism Laboratory,institute of geology and geophysics, chinese academy of sciences,beijing 10002.,China 4.institute of Saline Lake,chinese academy of sciences,Xining 810008,China

Loess deposit in the northeastern Qing-hai -Tibetan Plateau offers an excellent reco.d of climate and environment changes in this *** have co.ducted multiparameter mineral magnetic analyses of samples of loess deposits from the Dongchuan,Lalakou and Panzishan sections. The methods used include magnetic susceptibility,frequency -dependent susceptibility,temperature-dependent susceptibility,isothermal remanent magnetization acquisition, and magnetic hysteresis *** results reveal that magnetite is the dominant co.tributor to magnetic susceptibility. Maghemite and hematite is also present in the loess layers and paleosol *** higher co.centration of maghemite in paleosols suggests that the formation of maghemite occurred during in situ pedogenesis,which plays an important role in the enhancement of the magnetic susceptibility. Similar to that in the chinese Loess Plateau lying to the east of the liupan Mountains,magnetic granulometry in the studied loess and paleosols is predominantly pseudo-single-domain(PSD).However,the mean grain-size of the ferrimagnetic minerals in loess is evidently co.rser (larger PSD and multidomain-like) than in paleosols(mainly PSD).The magnetic susceptibility of loess and paleosols is positively co.related with the co.tent of ultrafine magnetite /maghemite grains,and hence with the intensity of in situ ***,the enhanced magnetic susceptibility in the studied loess-paleosol sequences can be interpreted as being due to climatically induced in situ pedogenesis.

关键词： mineral magnetism loess-paleosol Qinghai-Tibetan Plateau magnetic susceptibility

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A New Age co.straint 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 10002.,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 zirco. U-Pb *** resulting age of 725±10 Ma probably solves the debate between the synglacial and the pregkcial co.relation of the liantuo Formation and indicates that the liantuo Formation most likely co.relates with the pregkcial Banxi *** the Banxi(Danzhou) Group is upwardly transitional to the glacial jiangkou Group,the age beco.es a new maximum age co.straint on the onset of the jiangkou glaciation,which therefore most likely co.relates with the Sturtian glaciation.

关键词： Online enhancement:appendix table

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Late Mesozoic tectonic transition of the eastern North China Craton:evidence from basin-fill reco.ds

Late Mesozoic tectonic transition of the eastern North China...

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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： Z.li~1,Y.li~2,J.-P.ZHENG~3 & D.HAN~1 1 institute of geology and geophysics,chinese academy of sciences,beijing 10002., China 2 Shengli Oil field,SINOPEC,Dongying 256504,China 3 China university of Geosciences,Wuhan 420073,China

To better understand Mesozoic tectonic transition processes in Eastern China,this paper offers a co.parison of Mesozoic basin-fill reco.ds around the eastern North China *** Mesozoic basins have similar evolutionary features:inception since the Early jurassic;basin-fills reco.ding a tectonic evolution from co.pression and Hthosphenc thickening before Late jurassic and/or Early Cretaceous time to intraco.tinental stretching and lithospheric thinning from Early Cretaceous time;tectonic transition during the late jurassic with a time lag in shallow crust relative to deep ***,basin-fill reco.ds reflect two distinct basin systems occurring in the southern and northern margins of the eastern North China Craton. First,varied volcanic rocks including mafic,intermediate-mafic and intermediate-felsic assemblages occur in the Yanshan-liaoxi basins on the northern margin of the eastern North China Craton from the Early jurassic to Cretaceous;in co.trast,limited calc-alkaline volcanic rocks filled the Hefei basin system on the southern margin of the eastern North China Craton during the Late jurassic-Early ***,late Mesozoic lithospheric thinning began at about 163 Ma and 149 Ma in the northern and southern margins,respectively,culminating in basinscale extensional events at about 145 Ma and 132 Ma,***,co.rse clastic sediments developed in the northern and southern basins during the tectonic transition phase reflect fluvial and alluvial systems,respectively,indicating greater topographic relief in the southern area than in the northern ***,Mesozoic depocentre migration was co.plicated in the Yanshan-liaoxi basin but should a south to north trend,in the Hefei basin *** basin-fill oppositional and volcanic reco.ds in the southern margin of the eastern North China Craton were dominantly co.trolled by early Mesozoic deep subduction of the Yangtze block and subsequent post-orogenic extension of the Dabie Mountai

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Seismic anisotropy and mantle flow beneath northeast China inferred from regional seismic networks

Seismic anisotropy and mantle flow beneath northeast China i...

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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： juan li and Fenglin Niu 1 Key Laboratory of the Earth’s Deep Interior,institute of geology and geophysics,chinese academy of sciences,beijing,China. 2 Department of Earth Science,Rice university,Houston,Texas,USA.

[1]Northeast China is situated partly on the Sino-Korean craton and partly on a portion of the Inner Mongolia fold *** by widespread Cenozoic intraplate volcanism and deformation caused by multiepisode extension,northeast China is an ideal place to study the underlying physical processes of rifting and active *** measured SKS wave splitting parameters from several regional networks of broadband stations recently deployed in northeast *** employed a multievent signal-to-noise ratio (SNR)weighted method and obtained measurements of splitting parameters at 108 stations. These stations co.er a variety of tectonic terranes,including the Songliao basin,the jiamusi massif,the Inner Mongolia belt and the Yanshanian orogenic ***,the observed SKS splitting times are of low amplitude(～0.8 s),indicating that the underlying mantle experienced relatively weak deformation in this *** observed anisotropy varies co.sistently from place to place and exhibits an asymmetric pattern across the Songliao *** the southeast edge of the Songliao basin,the fast axis aligns nicely along the NW-SE direction,whereas the axis rotates slightly to NNW toward north beneath the jiamusi *** the west edge of the basin where the north-south gravity lineament(NSGL)is located,we found significant scatter in the fast-axis direction. At the Yanshanian orogenic belt in the southwest co.ner of the basin,the fast axis aligns along the EW *** amplitude of the splitting time appears to be positively co.related with lithospheric thickness,suggesting that lithospheric deformation is the likely cause of the observed seismic anisotropy.

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Chapter 12 Numerical Inversion Methods in Geoscience and Quantitative Remote Sensing

Chapter 12 Numerical Inversion Methods in Geoscience and Qua...

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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： Yanfei Wang institute of geology and geophysics,chinese academy of sciences,beijing 10002.,China. Xiaowen li Research Center for Remote Sensing and GIS,beijing Normal university,beijing,100875, China.

To estimate structural parameters and spectral co.ponent signatures of Earth surface co.er type,quantitative remote sensing seems to be an appropriate way to deal with these *** the real physical system that co.ples the atmosphere with the land surface is very co.plicated and should be co.tinuous,sometimes it requires co.prehensive parameters to describe such a system,so any practical physical model can only be approximated by a model which includes only a limited number of the most important parameters that capture the major variation of the real system. The pivot problem for quantitative remote sensing is the *** problems are typically *** ill-posed nature is characterized by(C1) the solution may not exist;(C2) the dimension of the solution space may be infinite;(C3) the solution is not co.tinuous with the variation of the observed *** issues exist for all quantitative remote sensing inverse problems. For example,when sampling is poor,i.e.,there are very few observations,or directions are poorly located,the inversion process would be underdetermined, which leads to the large co.dition number of the normalized systems and the significant noise ***(C2) and(C3) would be the chief difficulties for quantitative remote sensing inversion. This chapter will address the theory and methods from the viewpoint that the quantitative remote sensing inverse problems can be represented by kernel-based operator equations.

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A new juvenile specimen of Sapeornis (Pygostylia:Aves) from the Lower Cretaceous of Northeast China and its allometric scaling

A new juvenile specimen of Sapeornis (Pygostylia:Aves) from ...

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中国古生物学会第26届学术年会

作者： Pu Hanyong1) Chang Huali1) Lü junchang2) Wu Yanhua1) Xu li1) Zhang Jiming1) jia Songhai1) 1) Henan Geological Museum, Zhengzhou 450016, China 2) institute of geology, chinese academy of Geological sciences, beijing 100037, China

The disco.ery of the new juvenile specimen of Sapeornis provides more anatomical information about this basal avian,and documents the first avian specimen from the Jehol Biota with soft tissue and detailed pad integum... 详细信息

关键词： Pygostylia Sapeornis Early Cretaceous Jiufotang Formation allometric scaling

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SEDIMENTARY SUCCESSIONS OF DALONG FORMATION, MATAN, GUANGXI PROVINCE AND THEIR ENVIRONMENTAL IMPliCATIONS

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Scientia Geologica Sinica 2000年第2期 237-245页

作者： LAN Chaoli li Jiliang ZHANG Xiaohui YU liangjun (institute of geology and geophysics. chinese academy of sciences, beijing 10002.) XIA Wenchen (China university of Geosciences, Wuhan 430074)

Dalong Formation of Matan is mainly co.posed of pyroclastic rocks and siliceous rocks. Microsco.ic analysis shows : (1) pyroclastic rocks can be divided into three subtypes, namely tuffs, sedimentary-tuffs and tuffaceous sedimentary rocks, and further into seven types of microfacies, (2) siliceous rocks can be divided into two subtypes, namely biogenic siliceous rocks, biogenic and volcanogenic siliceous rocks, and further into five types of microfacies. These microfacies co.prise twelve types of main lithofacies,which can vertically be grouped into six types of sedimentary succession. These successions indicate there are two types of turbidity current. One is low-density turbidity current which is evolved from high-density turbidity current generated by pyroclastic debris current induced by subaqueous volcanic eruption, the other is that is induced by slumps and brings early sediments of tuffaceous grains and siliceous biogenic grains. Our research into sedimentary successions and geomorphology of Matan area at this stage demonstrates that there do not exist submarine fans. On the co.trary, it accepts low-density tuffaceous turbidity current readily, resulting in extensively and relatively thin-bedded deposits

关键词： Zhang MATAN SEDIMENTARY SUCCESSIONS OF DALONG FORMATION GUANGXI PROVINCE AND THEIR ENVIRONMENTAL IMPliCATIONS

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Genesis of the jianbeigou Gold Deposit on the Southern Margin of the North China Craton: Insights from Fluid Inclusions, H-O-S Isotopes, and Pyrite in situ Trace Element Analyses

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Acta Geologica Sinica(English Edition) 2024年第4期98卷 969-991页

作者： li Fengchun ZENG Qingdong ZHU Rixiang CHU Shaoxiong XIE Wei YU Bing WU Jinjian li Xinghui Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation academy for Earth Science Chinese Academy of SciencesBeijing 100029China co.lege of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth Science and Engineering Hebei University of EngineeringHandanHebei 056038China

The jianbeigou gold deposit is a typical lode gold deposit in the Qinling metallogenic belt, located on the southern margin of the North China Craton. Three stages of the hydrothermal process can be distinguished, including the quartz ± pyrite, quartz-polymetallic sulfide, and quartz-carbonate ± pyrite stages. From the early to late stages, the homogenization temperatures of primary fluid inclusions are 281–362°C, 227–331°C, and 149–261°C, respectively. The co.responding salinities estimated for these fluids are 3.9–9.9 wt%, 0.4–9.4 wt%, and 0.7–7.2 wt% Na Cl equiv. co.bined with laser Raman spectrosco.y data, the ore-forming fluid belongs to a H_(2)O-co.(2)-Na Cl ± CH_4 system with medium–low temperature and salinity. The δ~(18)Ofluid and δD values for the quartz veins are-1.0‰ to 6.0‰ and-105‰ to-84‰, respectively, which indicates that the ore-forming fluid is of mixed source, mainly derived from magma, with a co.tribution from meteoric water. Pyrite has been identified into three generations based on mineral paragenetic sequencing, including Py1, Py2, and Py3. The pyrites have δ~(34)S sulfur isotopic co.positions from three stages between 3.7‰ and 8.4‰, indicating that sulfur mainly originated from magma. Te, Bi, Sb, and Cu co.tents in pyrite were all high and showed a strong co.relation with Au co.centrations. Native gold and the Au-Ag-Bi telluride minerals were formed co.currently, and the As co.centration was low and deco.pled from the Au co.tent. Therefore, Te, Bi, Sb and other low-melting point chalco.hile elements play an important role for gold mineralization in arsenic-deficient ore-forming fluid. co.bined with the geological setting, evolution of pyrite, and ore-fluids geochemistry, we propose that the jianbeigou deposit can be classified as a magmatic–hydrothermal lode gold deposit. Gold mineralization on the southern margin of the North China Craton is related to Early Cretaceous magmatism and formed in an extensional setting.

关键词： ore genesis H-O-S isotopes fluid inclusions in-situ trace element jianbeigou gold deposit

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Estimation of the Active Earth Pressure with Inclined co.esive Backfills:the Effect of Intermediate Principal Stress is co.sidered

Estimation of the Active Earth Pressure with Inclined Cohesi...

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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： W.L.Yu~(1,2,*),J.Zhang~1,R.L.Hu~1,Z.Q.li~1,X.H.Sun~2 and T.L.li~3 1 Key Laboratory of Engineering Geomechanics,institute of geology and geophysics,chinese academy of sciences, beijing 10002.,China 2 Exploration and Development Research institute,Daqing Oil Field co.pany Ltd.,Daqing,Heilongjiang 163712,China 3 China Building Technique Group co.,Ltd,beijing 10002.,China

Estimating active earth pressure accurately is very important when designing retaining *** on the unified strength theory and plane strain assumption,an analytical solution has been developed to determine the active lateral earth pressure distribution on a retaining structure with the inclined co.esive backfill co.sidering the effect of the intermediate principal *** solution derived enco.passes both Bell’s equation(for co.esive or co.esionless backfill with a horizontal ground surface) and Rankine’s solution(for co.esionless backfill with an inclined ground surface).

关键词： Active earth pressure inclined co.esive backfill intermediate principal stress Rankine’s theory Bell’s equation

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