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中国科学院地质与地球物理研究所2.06学术年会

作者： Shiling Yang,Feng ding,and zhongli ding {3. of geology and Geophysics,chinese Academy of sciences,beijing 10002.,china

Quaternary loess-soil sequences in china and Tajikistan are valuable archives of the chemical weathering history for arid and semi-arid regions of *** development of new proxies independent of grain size are vital to reconstruct the long-term chemical weathering history of eolian *** this study,we analyze major elemental and Rb,Sr and Ba concentrations of decarbonated residue from representative loess and soil units along a north-south transect on the {2. Loess Plateau and compare these concentrations among different grain-size *** show that most of the elemental abundances and ratios vary considerably among different grain-size fractions for both loess and paieosols,indicating transport-driven compositional differentiation of minerals during subaerial ***, (CaO+NaO+MgO)/TiO ratios show little variation among different size fractions for the loess-soil ***-soil sequences at Lingtai(northern china) and Chashmanigar(southern Tajikistan) for the past 1.50-1.77 Ma show lower(CaO+NaO+MgO)/TiO ratios in soil units than in adjacent loess horizons,in good agreement with greater weathering intensity in soils than in loess ***(CaO+NaO+MgO)/TiO ratio of the decarbonated residue is therefore a reliable proxy for chemical weathering of loess deposits that is independent of grain *** (CaO+NaO+MgO)/TiO ratios of the Lingtai and Chashmanigar sections display a relatively regular oscillation within a narrow range in the early Pleistocene,and a rapid increase in average values and in variance from 0.85-0.6 Ma to the present,indicating lowered chemical weathering intensity in both the dust source regions and the depositional *** event may be causally related to the expansion of northern hemisphere ice and/or the regional tectonic uplift of high mountains in Asia since the mid-Pleistocene.

关键词： carbon isotopes of organic matter C3.and C4 plants loess precipitation seasonality climate zones Central Asia

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Aeolian origin of the red earth in southeast china

Aeolian origin of the red earth in southeast China

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中国科学院地质与地球物理研究所2.02.术年会

作者： SHANFA XIONG DONGCHUAI SUN and zhongli ding {2. of {3. and Geophysics,chinese Academy of sciences,10002. beijing,china

A clay-like deposit known as‘red earth’ is widely distributed over the terraces and high lands of the Yangtze River valley in southeast *** typical pedo-stratigraphical features have attracted the interest of pedologists and geologists for many years,although its origin is still *** we report an analyses of the grain-sie distributions,rare -earth element(ree) patterns and upper continental crust(UCC)-normalised major elemental composition of the red earth and compare them with those of the loess and other Aeolian deposits in northern *** results show that the red earth in southeast china has two or three end -member grain-size distributions,similar to the sedimentary characteristics and geochemical composition of Aeolian deposits found in northern *** with other evdence from field observations,these results suggest that the red earth is probably of Aeolian *** the basis of these data,we suggest that thick Aeolian dusts were also deposited in the wet subtropics and that the effect of the winter monsoonal winds upon the dust transport in eastern china was more important than previously *** 2.02.John Wiley & Sons,Ltd.

关键词： red earth southeast china grain-size distribution REE pattern

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Cosmogenic 2.Ne concentrations and exposure ages of summit bedrocks in the Grove Mountains,Antarctica

Cosmogenic 21Ne concentrations and exposure ages of summit b...

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中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： KONG Ping~(1,2.),ding Lin~2.LAI QingZhou~{3. HUANG FeiXin~3.1 Key Laboratory of the Earth’s Deep Interior,{2. of geology and Geophysics,chinese Academy of sciences,beijing 10002.,china 2.Key Laboratory of Continental Collision and Plateau Uplift,{2. of Tibetan Plateau Research,chinese Academy of sciences, beijing 100085,china 3.{2. of Mineral Resources Research,china Metallurgical geology Bureau,beijing 10002.,china

Various sources of Ne and Ne exist in surface rocks:cosmogenic,in situ nucleogenic from internal II and Th,trapped crustal nucleogenic and trapped *** paper reports the first measurement,in china,of cosmogenic Ne and Ne in surface *** developed a unique sample pre-treatment procedure that effectively removed inclusions inside quartz grains,and thus maximally reduced nucleogenic contributions of Ne and ***-heating experiments show that concentrations of cosmogenic Ne and Ne in summit bedrock samples R92.2.and R92.3.from Grove Mountains,Antarctica,are (3.83.0.87)×10 and(5.2.±0.51)×10 atoms/g,*** corresponding minimum exposure ages are 2.2.0.5 and 3.0±0.3.*** indicates that the ice sheet in East Antarctica was uncovered the crest of Mount Harding,a typical nunatak in Grove Mountains,since at least mid-Pliocene.

关键词： 2.Ne cosmogenic nuclide exposure age Antarctica Grove Mountains

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On the selection of reference velocities for split-step Fourier and generalized-screen migration methods

On the selection of reference velocities for split-step Four...

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中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： jing-Bo Chen 1 chinese Academy of {2.,{3. of geology and Geophysics,Key Laboratory of Petroleum Geophysics,beijing,china.

Split-step Fourier and generalized-screen migration methods are approximations with separation of variables to the one-way wave operator,in which the separation of space and wavenumber variables makes it possible to use the discrete fast Fourier transform to achieve computational efficiency. Both methods require the selection of reference velocities. Different choices of reference velocities lead to different velocity perturbations,and the smaller the velocity perturbations, the better the final image *** benefits of selecting a more representative reference velocity for the split-step Fourier method can be extended to the generalized-screen method by removing the limitation on the reference velocity for the generalized-screen *** experiments on the Marmousi model demonstrate the improvement of imaging by using an average velocity instead of the minimum velocity as the reference velocity for the generalized-screen method.

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A stability formula for Lax-Wendroff methods with fourth-order in time and general-order in space for the scalar wave equation

A stability formula for Lax-Wendroff methods with fourth-ord...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： jing-Bo Chen~1 ~1Key Laboratory of Petroleum Resources Research,institute of {2. and Geophysics,{3. Academy of sciences,beijing,china.

Based on the formula for stability of finite-difference methods with second-order in time and general-order in space for the scalar wave equation,I obtain a stability formula for Lax-Wendroff methods with fourth-order in time and general-order in *** the formula for methods with second-order in time,this formula depends on two parameters:one parameter is related to the weights for approximations of second spatial derivatives;the other parameter is related to the weights for approximations of fourth spatial *** discretizing the mixed derivatives properly,the formula can be generalized to the case where the spacings in different directions are different. This formula can be useful in high-accuracy seismic modeling using the scalar wave equation on rectangular grids,which involves both high-order spatial discretizations and high-order temporal approximations.I also prove the instability of methods obtained by applying high-order finite-difference approximations directly to the second temporal derivative,and this result solves the"Bording’s conjecture."

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Advance-retreat history of the East-Asian summer monsoon rainfall belt over northern china during the last two glacial-interglacial cycles

Advance-retreat history of the East-Asian summer monsoon rai...

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中国科学院地质与地球物理研究所2.08学术年会

作者： Shiling Yang~*,zhongli ding Key Laboratory of Cenozoic {2. and Environment,{3. of {2. and Geophysics,chinese Academy of sciences,beijing 10002.,china

In northern china,the history of desert migration provides a good measure of the East-Asian summer monsoon variations,since the desert margin environment is very sensitive to changes in summer monsoon *** margin migration can be well documented in the downwind loess deposits,since the grain size of chinese loess is principally controlled by source-to-sink distance and hence the loess grain size is an effective proxy for reconstructing the history of the East-Asian summer *** order to investigate the pattern and migration of the summer monsoon rainfall belt over northern china during the past two glacialinterglacial cycles,contour maps of loess grain size were constructed for MIS {3.3.4,5,6 and *** the grainsize isolines show a near north-south gradient for both glacials and interglacials,indicating a dominant dust source region in north and an approximately north-south dust transport pathway for dust deposits in the main body of the Loess Plateau,at least for the past two glacial-interglacial *** reconstructed southeast desert margin for MIS {3.3.4,5,6 and 7 roughly parallels the present isohyets,implying that the pattern of the East-Asian summer monsoon rainfall belt during the past two glacial-interglacial cycles is similar to the present,i.e.a northeast-southwest trend for the isohyets of the summer monsoon,despite the glacial-interglacial *** the grain-size isolines of MIS {3.as a reference,we derive a northerly desert retreat of～160 km,～19 km,～{3.5 km and～{3.3.km for MIS 3.4,5 and 7,respectively,and a southerly desert advance of～{3. km for MIS 6,that could be preliminarily regarded as the relative migration distance for the East-Asian summer monsoon rainfall belt In addition,the inferred climate conditions in MIS 3.are cool and humid in northern china,while the driest and coldest interval of the last two glacial periods occurs in MIS 6.

关键词： East-Asian summer monsoon rainfall belt chinese loess grain size Mu Us desert glacial-interglacial cycle

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Roles of TRPC3.6/7 channels in a rat model of inflammatory pain

Roles of TRPC3/6/7 channels in a rat model of inflammatory p...

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中国生理学会第2.届全国会员代表大会暨生理学学术大会

作者： jing ding~1,Xiu-Yu CUI~1,Jun CHEN~(1,2.*) 1 {2. for Biomedical sciences of Pain,Capital Medical University,beijing 100069,china 2.{2. for Biomedical sciences of Pain and {2. for Functional Brain Disorders,Tangdu Hospital,Fourth Military Medical University,Xi’an 71003.,china

Background:The transient receptor potential canonical(TRPC) channels,which are abundantly expressed in central nervous system(CNS),are Ca permeable nonselective cation channels with different biological *** studies indicated that TRPC1 and TRPC6 channels were likely to be involved in the pathological process of mechanical hyperalgesia and nociceptor *** whether TRPC channels are involved in melittin- or formalin-induced inflammatory nociceptive responses remains ***:In this study,we used behavioral tests combined with pharmacological manipulations to explore the potential roles of TRPC channels in inflammatory pain and ***:In this study,we used the well-established bee-venom(melittin) and formalin *** flinch test was to examine whether TRPC channels are involved in inflammatory paininduced primary *** pain sensitivity of rats was determined by testing paw withdrawal thermal latency(PWTL,s) in response to heat stimuli applied to the injected *** pain hypersensitivity was tested as the paw withdrawal mechanical threshold(PWMT,g).Results:Post- and pre-treatment of the primary injury site with *** of SKF963.5,a TRPC3.6/7 antagonist,significantly suppressed the development of inflammatory pain-evoked persistent spontaneous nociception(PSN) and hypersensitivity(thermal and mechanical). Whereas local administration of SKF963.5 into the contralateral hindpaw produced no significant effect on any of the pain-associated *** together,these data indicate that TRPC3.6/7 channels might be involved in pathophysiological processing associated with inflammatory ***:In conclusion,we demonstrated for the first time that,although SKF963.5 do not affect baseline thermal latency and mechanical nociceptive threshold,it reversed the inflammatory pain-induced spontaneous nociception,heat and mechanical hyperalgesia, indicating that TRPC3.6/7 channels might pla

关键词： TRPC channels melittin formalin test persistent spontaneous nociception primary thermal hyperalgesia primary mechanical hyperalgesia

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A 2. Ma pollen record of East-Asian summer monsoon evolution from Guyuan,Ningxia,china

A 20 Ma pollen record of East-Asian summer monsoon evolution...

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中国科学院地质与地球物理研究所2.08学术年会

作者： Hanchao Jiang ~*,zhongli ding Key Laboratory of Cenozoic {2. and Environment,{3. of {2. and Geophysics,chinese Academy of sciences,beijing 10002.,china

Pollen analysis was conducted on the fluviolacustrine sediments from the east side of the Liupan Mountains, a relatively monsoon-sensitive region,and provided for the first time a continuous evolutionary history of vegetation and climate in East china during the *** pollen record spanning the last 2. Ma indicates that the vegetation and thus East-Asian summer monsoon evolution can be divided into three stages:2..13. 14.2. Ma,14.2.-11.3. Ma and 11.3.-0.08 Ma,in spite of general dominance of steppe throughout the *** the period 2..13.14.2. Ma,the pollen assemblage was characterized by high abundance of Artemisia and small amounts of temperate to subtropical deciduous broad-leafed trees such as Juglans,Carya, Quercus and Betula,suggesting that the East-Asian summer monsoon was generally *** interval from 14.2. to 11.3. Ma was marked by a significant decline in the East-Asian summer monsoon,as indicated by Artemisia gradually replaced by Humulus and halophytic *** and Ephedra also reached high values in this *** 11.3. Ma ago,percentages of halophytes dominated by Chenopodiaceae and Tamaricaceae maintained a high mean value of about 40%,revealing a weak intensity of East-Asian summer *** general weakening of the monsoon circulation during the Neogene and the significant monsoon decline during the late Middle Miocene in particular might link with the global cooling trend probably through two *** and ice-sheet expansion over the polar region caused an increase in meridional temperature gradients leading to the southward retreat of the monsoon *** global cooling may have also reduced the amount of water vapor held in the atmosphere,and led to both additional cooling and further weakening of the East-Asian summer *** cause for a short-lived resumption during the period 1.0-0.8 Ma is under investigation.

关键词： Pollen East-Asian monsoon Neogene Fluviolacustrine sediments Sikouzi Ningxia

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Numerical Modelling of Ore-forming Dynamics of Fractal Dispersive Fluid Systems

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Acta Geologica Sinica(English Edition) 2001年第2期75卷 220-232页

作者： DENG Jun, FANG Yun, YANG Liqiang, YANG Junchen, SUN Zhongshi, WANG Jianping , ding Shijiang and WANG Qingfeichina University of Geo{2., {3. 100081china University of Geo{2., Wuhan 43.074 institute of geology and Geophysics, chinese Academy of {2., {3. 100101 Jilin University, Changchun 13.02. china University of Geosciences Beijing 100081 china University of Geosciences Wuhan 430074 institute of geology and Geophysics Chinese Academy of Sciences Beijing 100101 Jilin University Changchun 130026 [?]5Deng Jun Born in February 1958 graduated from Wuhan College of geology. He acquired M.Sc in tectonics at the china University of Geoscienses (Wuhan) in 1989 and Ph.D at the {2. of Geomechanics Chinese Academy Of Geological Sciences in 1992 got postdoctoral certification in mineral deposit at the china University of Geosciences ({2.) in 1994. He is now engaged in researches on regional tectonics geofluid and ore-forming dynamics. Tel: 10 82322301 E-mail: djun@***

Based on an analysis of the fractal structures and mass transport mechanism of typical shear-fluid-ore formation system, the fractal dispersion theory of the fluid system was used in the dynamic study of the ore formation system. The model of point-source diffusive illuviation of the shear-fluid-ore formation system was constructed, and the numerical simulation of dynamics of the ore formation system was finished. The result shows that: (1) The metallogenic system have nested fractal structure. Different fractal dimension values in different systems show unbalance and inhomogeneity of ore-forming processes in the geohistory. It is an important parameter to symbolize the process of remobilization and accumulation of ore-forming materials. Also it can indicate the dynamics of the metallogenic system quantitatively to some extent. (2. In essence, the fractal dispersive ore-forming dynamics is a combination of multi-processes dominated by fluid dynamics and supplemented by molecule dispersion in fluids and

关键词： fluid system fractal dispersion point-source illuviation model ore-forming dynamics numerical simulation

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DEFORMATION OF THE EASTERN HIMALAYAN SYNTAXIS: EVIDENCES FROM STRUCTURES AND KINEMATICS OF ITS WESTERN BOUNDARY

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地学前缘 2000年第S1期7卷 18-20页

作者： Zhang J.,Zhong D.,ding L.,Ji J.,He S(institute of {2. and Geophysics, {3. Academy of sciences, beijing 10002.,china)

The western boundary of the Eastern Himalayan Syntaxis (EHS) is a deformation belt up to 3.km wide (Fig.1). Trending ca. N3.°E, it separates the Gangdise magmatic belt in the west from the gneiss of EHS in the east. Its rock association, mica\|schist, quartzite, marble, and amphibolite, can be traced to the south to Gangdise belt and they were probably metamorphosed from the sediments along Yarlung Zangbo. This belt consists of several intensive deformation zones, the largest one of which is along the belt’s western margin from Dongjug to Mainling and we called this ca. 10km wide shear zone as the Dongjug\|Mainling shear zone (DMSZ).DMSZ experienced earlier ductile shear and later ductile\|brittle normal faulting. The earlier deformation produced mylonitic rocks. Their foliation trends N3.°～40°E and dips northwest with the angle ranging from 55°to 80°, steepening northeastward. The penetrative kinematic lineation in the rocks has a varying attitude along the trend of DMSZ. It dips southwest with an angle of ca.3.° in the southwest near Mainling, whereas dips northeast in the northeast. Moreover, the northeast dipping lineation steepens northeastwards, e.g., its angle ranges form 3.° to 45° in the segment from Serkyim La to Dongjug but becomes 60～70° in the northeast most in another zone near Parlung. Kinematic indicators show that the motion of DMSZ had a left\|lateral slipping component, but the vertical motion components were different in the southwest from the northeast. From Serkyim La to the northeast, DMSZ had a kinematics of NW plate (Gangdise belt) thrusting over the SE plate (EHS) and its thrusting component increased toward northeast. However, the DMSZ has a vertical motion with the SE plate (EHS) as the uplifting plate.

关键词： Eastern Himalayan Syntaxis indentation uplift

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