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1Early J_2 basalts in SE China:Incipience of large-scale late Mesozoic magmatism显示文摘Magmatism in SE China was dormant during 204―180 Ma, but was reactivated in 180― 170 Ma (early J2), and then became more and more intensive towards the end of early Cretaceous. The small-scale early J2 magmatism is the incipience to long-term and large-scale magmatism in this region. A near east-west (EW) trend volcanic belt was distributed across south Hunan, south Jiangxi and southwest Fujian was formed during early J2 time. Along this belt from the inland toward the coast, the lithology of basalts changes from alkali into tholeiite, and the amount of erupted volcanic rocks and the proportions of rhyolites coexisting with the basalts increase. On the basis of geochemical char- acteristics of these basalts, we infer that the melting degree of source rocks and the extent of frac- tional crystallization and crustal contamination all increased whereas the depth of mantle source de- creased from the inland to the coast, which led to the variations of geological characteristics of the volcanic belt. In early J2, the western spreading Pacific plate began to subduct underneath SE China continental block, reactivating near EW trend deep fault that was originally formed during the Indos- inian event. The stress of the western spreading Pacific plate and the extent of asthenosphere up- welling increased from the inland to the coast, which is consistent with the generation and evolution of early J2 basalts.XIE Xin1, XU Xisheng1, ZOU Haibo2, JIANG Shaoyong1, ZHANG Ming3 & QIU Jiansheng1 1. State Key Laboratory of Mineral Deposit Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China 2. Department of Earth and Space Sciences, University of California at Los Angeles, Los Angeles, CA90095-1567, USA. 3. GEMOC ARC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, N.S.W. 2109, Australia 2006Science China Earth Sciences2006,49,8:30
2Tectonic evolution of the Dabieshan orogen: In the view from polyphase deformation of the Beihuaiyang metamorphic zone显示文摘The Beihuaiyang metamorphic zone was formed by the Early Mesozoic collision of the North and South China Blocks. It consisted of the Foziling and Luzhenguan complexes and was thought to have never afforded a deep subduction. A similar feature of the deformation in the Dabieshan UHP metamorphic rocks implies that these different tectonic units share the same geodynamic background. The early stage of deformation can be preserved on account of their relatively shallower subduction than that for UHP rocks. On the basis of an analysis of the geo- logical structure and geochronological results, five deformational stages have been recognized: a D1-Early compressional deformation which represents the continental subduction; a D2-Early exhumation deformation producing a syn-convergence exhumation; a D3-Main deformation, represented by an exhumation deformation with Late Triassic age; a D4-Doming and its margin extensional gravity collapse deformation and finally a D5-regional extensional deformation of Cretaceous that was mostly introduced by the migmatization and plutonism.LIN Wei1, 2, Faure Michel3, WANG Qingchen1 & Arnaud Nicolas4 1. LTE, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University, Japan 3. ISTO, UMR CNRS 6113, Batiment Géosciences, Orléans Université d’Orléans, 45067 Orléans Cedex 2, France 4. UMR 6524 'Magmas et Volcans', 5 Rue Kessler, 63000 Clermont-Ferrand, France 2005Science China Earth Sciences2005,48,7:25
3No apparent lock-in depth of the Laschamp geomagnetic excursion: Evidence from the Malan loess显示文摘The first-order chronological framework of the long-term Chinese loess/paleosol sequences was based mainly on magnetostratigraphy. However, there remain arguments on the lock-in ages of the major geomagnetic reversals. This study systematically compared the stratigraphic locations of the Laschamp excursion and Henrich events (H4 at~39 ka and H5 at~48 ka) recorded by the Luochuan loess profile in the central Chinese Loess Plateau. Results show that the Lascchamp excursion is bracketed well by these two cold events, and the corresponding estimated age is between about 41.7-43.7 ka, which is close to the widely accepted age of ~40-41 ka for the excursion.Therefore, our new results do not suggest apparent lock-in effects in the last glacial Malan loess.ZHU Rixiang1, LIU Qingsong1,2, PAN Yongxin1, DENG Chenglong1, ZHANG Rui1 & WANG Xianfeng3 1. Paleomagnetism and Geochronology Laboratory (SKL of Lithosphere Evolution), Institute of Geology and Geophysics, Chi- nese Academy of Sciences, Beijing 100029, China 2. Institute of Geophysics and Planetary Geophysics, University of California, Santa Cruz, CA 95064, USA 3. Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA 2006Science China Earth Sciences2006,49,9:12
4Global absorption center map of the mafic minerals on the Moon as viewed by CE-1 IIM data显示文摘Determining the global distribution of minerals on the Moon has been an important goal of lunar science. Hyperspectral remote sensing is an important approach to acquiring minerals on the Moon on the global scale. The wavelength of the absorption band center is the key parameter for identifying minerals with reflectance spectra as well as remote sensing data. The global absorption center map of the mafic minerals of the Moon was produced for the first time with the Chang’E-1 IIM data. This map shows the global distribution of mafic minerals such as orthopyroxenes, clinopyroxenes, and olivine and even plagioclase feldspar of the Moon. The validation for some representative areas indicates that the global map is reliable and even more detailed than the results derived from Clementine-data. Moreover, our method is insensitive to the topography and viewing and illumination geometries. The global absorption band center map not only contributes to the lunar science research, but also has other implications to be further studied. Moreover, the preprocessing methods such as calibration and correction introduced in this study can be useful in other research with IIM data.WU YunZhao 1,4* , ZHANG Xia 2 , YAN BoKun 3 , GAN FuPing 3 , TANG ZeSheng 4 , XU AoAo 4 , ZHENG YongChun 5 & ZOU YongLiao 5 1 School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China 2 Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China 3 Institute for Remote Sensing Method, China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China 4 Collaborative Research Laboratory on Lunar and Planetary Exploration, Macao University of Science and Technology, Taipa, Macao, China 5 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 2010Science China(Physics,Mechanics & Astronomy)2010,53,12:11
5Carbon isotopic characteristics and their genetic relationships for individual lipids in plants and sediments from a marsh sedimentary environment显示文摘The carbon isotopes of individual lipids in herbaceous plants and tree leaves in Ruoergai marsh were measured by the GC-IRMS analytical technique in order to understand the inherent relationships of carbon isotopes between sedimentary and plant lipids from typical marsh environment. The analytical results show that the carbon isotopic compositions of n-alkanes in different kinds of plants differ significantly. Mean δ 13C values of n-alkanes in her-baceous plants (?32.2‰―?36.9‰) are 3.3‰ lower than those in woody plant (?27.2‰― ?35.0‰). The carbon isotopic compositions of fatty acids in organisms (?30.3‰― ?36.2‰) are very similar to those of n-alkanes and the δ 13C values for unsaturated fatty acids are within the range of those for saturated fatty acids. The differences in δ 13C values between plant lipids are obvious and range from 2.4‰ to 7.8‰. It is observed that the carbon isotopic compositions of sedimentary lipids are closely related to those of plant lipids. The carbon isotopic compositions (?27.0‰―?36.9‰) of n-alkanes, ≥C16 fatty acids, n-alkanols, sterols and n-alkanones in the sediments are similar to those of plant lipids and the carbon isotopic compositions of short-chain sedimentary lipids are similar to those of long-chain sedimentary homologues. These indicate that the sedimentary lipids are derived from high plants. However, the δ 13C values of C14:0 and C15:0 fatty acids in the sediments are lighter than those of the same carbon number saturated homologues in plants, reflecting the genetic features partially derived from bacteria. These data provide scientific evidence for carbon isotope-applied research of individual lipids.DUAN Yi1, ZHANG Hui1, ZHENG Chaoyang1, WU Baoxiang1 & ZHENG Guodong2 1. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China 2. Department of Earth & Planetary System Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-85Japan 2005Science China Earth Sciences2005,48,8:6
6ZONAL MEAN STRUCTURES OF THE EXTRATROPICAL TROPOSPHERE显示文摘The study of mean circulation fields requires evaluation of eddy foreings in the atmosphere.Due to the difficulty incalculating the eddy forcings on theory,the mean state equations including the eddy forcings were used mostly fordiagnostic studies only.Using the geostrophic perturbation solutions obtained by McHall (1991a),we may deal withtheoretically the eddy fluxes and their convergence.This allows us to employ the mean state equations for the study ofmean circulation fields.It will be found that the time averaged zonal mean structure and circulation of the troposphereat middle and high latitudes can be reproduced basically in terms of the mass and momentum balances in geostrophicwave circulations.Y.L.McHall Department of Earth,Atmospheric and Planetary Sciences,MIT,MA 02139,USA 1993Acta meteorologica Sinica1993,7,2:5
7Lunar digital elevation model and elevation distribution model based on Chang’E-1 LAM data显示文摘More than 8.2 million effective data samples were obtained by the Chang’E-1 Laser Altimeter (LAM).In order to produce a global topographic model of the moon with improved accuracy,a hierarchical many-knot spline method was proposed in this paper.This algorithm makes use of a hierarchy of control lattices to approximate or interpolate the LAM data.Based on the proposed algorithm,a 0.0625°×0.0625° grid of global lunar DEM was obtained and it was compared with ULCN2005,CLTMs01 and Kaguya models,respectively.At the same time,this paper explored the elevation distribution law and established the elevation distribution model.It is shown that the global lunar and nearside elevation distribution is positively skewed and leptokurtic normal distribution,and the farside elevation distribution is a positively skewed and platykurtic normal distribution.CAI ZhanChuan1,2,ZHENG CaiMu1,2,TANG ZeSheng1,2,3 & QI DongXu1,2,4 1 Faculty of Information Technology,Macao University of Science and Technology,Macao,China 2 Collaborative Research Laboratory on Lunar and Planetary Exploration,Macao University of Science and Technology,Macao,China 3 School of Information Science and Technology,Tsinghua University,Beijing 100084,China 4 School of Information Science and Technology,Sun Yat-sen University,Guangzhou 510275,China 2010Science China(Technological Sciences)2010,53,9:4
8地球科学与社会:全球综述显示文摘如果人类要长期继续生存和繁荣,必需了解支持人类需求的地球和它的能力。地球科学的任务是认识地球,进行推断,从而达到规划人类社会的目的。推动地球活动的内因是其内部的对流作用,外因是太阳能,固体地球、水圈、大气圈与生物圈形成了全球循环系统。固体地球科学委员会注重的主要研究课题包括:1.地球内部动力学;2.岩石圈的形成和演化;3.大陆动力学;4.生物的多样性和灭绝;5.活动的行星:地质灾害;6.地质历史中的全球环境与变化;7.持续的能源与矿产资源;8.了解人类与地球的相互作用与运用这些知识于社会。人类社会是地球循环的一部分,它从地球中提取资源,把废料又送回地球内,它破坏地球的自然保护圈。对于全球的认识将可指导人类社会减少对地球的流体层与土壤这个保护圈的野蛮性破坏。因此,地球科学是社会的一个好的测试器。P.J.Wyllie(Division of Geological and Planetary Sciences,California Institute of Technology,Pasadena,CA 91125) 1994地学前缘1994,1,Z1:3
9Notes on Extended-Range Atmospheric Prediction in the Northern Hemisphere Winter显示文摘NotesonExtended-RangeAtmosphericPredictionintheNorthernHemisphereWinterShingoYamadaForecastDivision,JapanMeteorologicalAgency...Shingo Yamada Forecast Division, Japan Meteorological Agency, Tokyo, 100, Japan Shuhei Maeda Administration Division, Climate and Marine Department, Japan Meteorological Agency, Tokyo, 100, Japan K. Gambo c/o Department of Earth and Planetary Physi 1997Advances in Atmospheric Sciences1997,14,1:3
10深源地震:橄榄石→尖晶石相变诱发断层显示文摘70年代以来,人们已经知道在地球几百公里处有深源地震存在,在这个深处压力和温度不可能使岩石产生脆性剪切断裂。在300km之下,地震出现频率随深度增加而迅速减少,但是在600km处又再次增加,在700km处深源地震停止。五年之前,我们发现这种深源地震与一种新的塑性不稳定性有关。在地球400km处,当上地幔最主要矿物橄榄石(Mg,Fe)_2SiO_4发生相变时会导致一种新的断层类型产生。我们首先利用锗橄榄石Mg_2GeO_4,(即晶体结构与镁铁橄榄石相同,而化学成分有所不同,它可以在比较低压力条件下发生相变)进行模拟实验,借以证明在上地幔很高压力条件下橄榄石也会发生相变。这种新的机制叫自组织类的脆性断裂(self─organizinglikebritlefailure),其特征是:在断层生长过程中会释发地震能量;在由很细尖晶石颗粒组成的“超塑性层”中会发生断层滑移(即所谓显微反向断裂,microanticrack)。由这种机制形成的断层只在放热反应过程中产生,它可以用来解释为什么深源地震停止于700km,因为在这个深度,橄榄石到尖晶石相变为下地幔高密度矿物的吸热反应。深源地震的地震学证据与这种新机制是一致的。Harry W. Green,Ⅱ(Institute of Geophysics and Planetary Physics and Department of Earth Sciences,University of California,Riverstde,CA 92521,USA) 1995地学前缘1995,2,1:2
11The formation of and close white dwarf binaries显示文摘Han Z Podsiadlowski P bipolar planetary nebulae Eggleton P P 1995Monthly Notices of the Royal Astronomical Society1995,272,:1
12SHRIMP U-Pb Geochronology of Ultrahigh-pressure Metamorphic Rocks of the Dabie Mountains,Central China显示文摘S. MARUYAMA H. TABATA Department of Earth & Planetary Sciences Tokyo Institute of Technology Tokyo 152 Japan A. P. NUTMAN Research Institute of Earth & Planetary Sciences Australian National University Canberra Australia T. MORIKAWA 1998Continental Dynamics1998,,1:1
13A novel terrestrial organic matter in sediments based on and isoprenoid tetraether lipids 显示文摘Hopmans proxy for branched Planetary E C Weijers J W H Schefu E 2004Earth and Science Letters2004,224,1:1
14Almandine megacrysts from Yingfengling Cenozoic basalt in Leizhou Peninsula and their parental magma origin显示文摘The garnet megacrysts from Yingfengling basalts are characterlzed by high FeO (>20%), CaO (7.02% -8.16%) and low MgO (5.88%-10.87%). Significant composition variations are observed in these megacrysts, of which Ni, V, Sc, Co, and HREE are positively correlated with their Mg# and Zr, Hf, Ga, Y, Sr, Nb, Zn and LREE-MREE are negatively correlated with Mg#. Megacryst parent magma is a highly evolved residual melt with strongl depletion in Ti, Sr, Hf, Nb and HREE. This parental magma was generated by more than 60% of crystallization fractionation of clinopyroxene, garnet, plagioclase and ilmenite from quartz tholeiitic magma. It has not erupted to the surface, but stayed at the upper mantle and formed the megacrystic cumulate. Megacrysts and their host basalt are in disequilibrium.YU Jinhai & S. Y. O’Reilly1. National Key Laboratory of Metallogenic Mechanism of Endogenetic Deposits, Department of Earth Sciences, Nanjing University, Nanjing 210093, China 2. National Key Center of GEMOC, Department of Earth and Planetary Sciences, Macquarie University, North Ryde, NSW 2109, Australia 2001Chinese Science Bulletin2001,46,14:1
15An Introduction to the New Book-GEOSTROPHIC WAVE CIRCULATIONS显示文摘AnIntroductiontotheNewBook-GEOSTROPHICWAVECIRCULATIONS¥Yong.L.McHallDept.ofEarth,AtmosphericandPlanetarySciences,MITPublished...Yong. L. McHallDept. of Earth, Atmospheric and Planetary Sciences, MITPublished by China Meteorological Press 1994Advances in Atmospheric Sciences1994,11,2:0
16Genesis of Rare Element Mineralized Granites in Southern China:Evidence from Melt and Fluid Inclusions显示文摘Rare element mineralized granites of the Yanshan period in Southern China are characterized by highcontents of SiO2,Na2O,O,K2O,and F and are enriched in Nb,Ta,REE,W,Sn,Be and Li.Opinions dif-fered over whether they are of metasomatic or magmatic origin.In this paper,we present results of a studyon melt and fluid inclusions in topaz-albite feldspar granite from Limo Nb-Ta-W-Sn granite and414 Ta-Li albite granite.Our data,which come from 15 mineralized granites,provide strong supportmagmatic origin.Melt inclusions are recognized in both topaz and quartz,and are associated with primarygas-rich inclusions.Crystallites of a Nb(Ta)-bearing mineral and cassiterite are also commonly presentas inclusions in the topaz.Multiphase(melt+fluid)inclusions are observed in some quartz from granites andgranite-related pegmatite.Melt inclusions start to melt at a temperature of approximately 540 ℃ in topazand 650℃in quartz.Final homogenzation temperature is 700-900℃ in quartz,700-800℃ in topazand 440—550℃ forChen Ziying Xia WeihuaChina University of Geosciences, Wuhan 430074Anthony E.Williams-JonesDepartment of Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal,Quebec, Canada, H3A 2A7 1993Journal of Earth Science1993,12,1:0
17Structure of a pair of anticyclonic vortices in northern part of the South China Sea in autumn of 1994显示文摘A pair of remarkable meso-scale anticyclonic vortices, one formed closely to another, in the northern part of the South China Sea during the period from the later August to early September of 1994 were documented by the in situ observation data. Their spatial structures were examined in detail from the horizontal and two nearly perpendicular/vertical angles of view. It was shown that the horizontal scales of these two vortices were around 100, 50 km, and their vertical scales were about 500, 1000m, respectively. Two 'warm core' structures associated with these two vortices were found in their horizontal and vertical analyses. The closer spacing of these two vortices (namely, 60 ln), which was smaller than the Rcssby radius of deformation, suggested that they might merge with each other during their next evolution stages and form into a larger vortex eventually.Fu Gang, Toshio Yamagata1. Department of Marine Meteorology, Ocean University of Qingdao, Qingdao 266003, China2. Department of Earth and Planetary Physics, University of Tokyo, Japan 2002Acta Oceanologica Sinica2002,21,2:0
18Geostrophic Wave Circulations(English edition)显示文摘GeostrophicWaveCirculations(Englishedition)YongL.McHall(Dept.ofEarth,AtmosphericandPlanetarySciences,MITPublishedbyChinaMeteo...Yong L.McHall(Dept.of Earth,Atmospheric and Planetary Sciences,MITPublished by China Meteorological Press) 1995Advances in Atmospheric Sciences1995,12,2:0
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