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1.
Chemistry of Aerosols over Chukchi Sea and Bering Sea 总被引：2，自引：0，他引：2
The contents of elements in aerosols sampled during the First Chinese Arctic Research Expedition (CHINARE-1) show great differences from one element to another. Na, K,Ca, Mg, A1, F, and Cl are the major components in the aerosols, whose contents are larger than 30 ng/m^3. The chemical elements whose contents vary between 0.1 - 30 ng/m^3 are Br,Sr, Cr, Ni, and Zn. The chemical elements whose contents are close to or slightly higher than 0.1 ng/m^3 are Rb, Ba, Zr, Th, and Pb. The contents of As, Sb, W, Mo, Au, La, Ce, Nd,Sin, Eu, Tb, Yb, Lu, Sc, Co, Hf, Ta, and Cd are less than 0.1 ng/m^3. The mass concentration data for the same element, as observed during CHINARE-1, are almost accordant, but much lower than what is observed in the China‘ s seas or the coasts of China. The enrichment factor and electron microscopic analyses and lead isotope tracing were used to distinguish their sources.Four groups of sources can be classified as follows: anthropogenic: As, Sb, W, F, Mo, Au,Cu, Pb, Cd, V; crustal: La, Ce, Nd, Sm, Eu, Tb, Yb, Lu, Fe, Sc, Cr, Co, Ba, Zr, Hf,Ta, Cs, Mn, Th, U; oceanic:Na, K, Ca, and Mg; and mixing: Rb, Sr, Ca, and Mg. 相似文献
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本文对河南济源盆地大峪槐疙瘩岭二叠系上石盒子组(P3sh)、孙家沟组(P3s)和三叠系刘家沟组(T1l)剖面岩石样品进行了元素、频率磁化率、碳酸盐以及总有机质等的分析研究,结果表明在二叠系孙家沟组(P3s)底部济源动物群化石层、以及三叠系刘家沟组(T1l)底部界线(P/T)附近,其微量和常量元素发生了较明显的变化。化石层中Ba,Cr,Hf,Nb,Th,Ti,V,Y,Tl,Zn,Cu,Ga,Pb,Ni,La,Rb,Nd,以及K2O,Al2O3,Fe2O3含量相对较高,Zr,W,Sr,Bi,Co,Ce,以及SiO2,Na2O含量较低,MgO,CaO,Mn则没有明显的变化。Ba,Hf,Nb,Th,Ti,V,Y,W,K2O,Al2O3,SiO2,Na2O,Bi,Fe2O3,Ni,Co,La,Nd,Ce,及有机碳含量在三叠系底部含量明显上升,Cu,Ga,Pb,Tl,Zn,Cr,Zr,Sr,MgO,CaO,以及岩石频率磁化率Xfd、碳酸盐含量则明显下降。该剖面不仅记录了二叠—三叠纪的生物灭绝事件,而且有明显的二叠—三叠系界线,事件及界线的形成可能与沉积环境和古气候有关,水体的变浅、炎热气候和风化作用加强可能是直接的原因。石盒子组(P3sh)主要为河流—三角洲沉积环境,古气候相对温暖湿润;孙家沟组(P3s)为三角洲平原相,前期和后期有强烈风化作用,并且炎热多雨。中期则水平面上升,水下三角洲前缘砂质沉积为主;三叠系刘家沟组(T1l)则水体进一步扩张,气温相对下降。 相似文献
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《Scientia Geologica Sinica》1999,(1)
1.IntroductionForelandbasin,thesedimentarybasinlyingbetweenthefrontofanorogenandtheadjacentcraton,isanimportantaspectforthestudyonlithospheretectonicevolutionoforogen(e.g.,Tankard,1986,Ren,etal.,1991;Li,1992,Chen,etal.,1992,Liu,etal.,1994,LihouandAlien,1996,Li,etal.,1997,DongandZhang,1997).Currently,itisdividedintotwogenetictoes,i.e.,peripheralforelandbasinsituatedagainsttheouterarcoftheorogenduringcontinent-continentcollisionandretro-arcforelandbasinbehindamagmaticarclinkedwithsubductiono… 相似文献
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中國礦産賦藏,原非少數,其重要者如煤,鐵,石油,錳,鎢,銻,鉛,鋅,錫,金,鋁以及其他金屬非金屬等,多所發现。然其價值之詳細認識,则尚未敢遽言。近年經地質調查所之努力進行,關於重要礦藏量之估計,多有增進,茲就已得部份列如第一表。計有煤,鐵,石油,鎢,銻,鋁,螢石及菱鎂礦等。 相似文献
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《Scientia Geologica Sinica》1999,(3)
1.IntroductionTheChineseAltaidorogenicbeltislocatedinnorthemXinjiang,ChinaandisthemiddleportionofamoreextensiveorogeninthecentralAsia,namedAltaidorogen,whichextendsfromwesternMongolia,throughnorthwesternChina,toeastemKazakhstan.IntermsofitsstratigraPhy,magmatism,metamorphismandsmictufalpattems,theChineseAltaidorogenicbeltcanreflectsthegeodynamicevolutionofthewholeAltaidorogen.BasedonthegeologicalfeaturesoftheChineseA1taidorogenicbelt,amodelofgeodynamicevolution,calledaccretionaryarcoroge… 相似文献
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《Continental Dynamics》1997,(1)
ForaPrecambriancratoncomposedofcompositeterranes,orblocks,andbelts,whichexperiencedcomplexpolyphasedeformationandmetamorphism,thefinaltectonothermaleventismoresignificantthantheearlieronesinthelightofplatetectonics,becausethefinaltectonothermaleventresultedfromamalga-mationofthecraton.Although,generally,aworkinghypothesisofpolyphasedeformationandmetamorphismiswidelyappliedtoahigh-gradeterrane,dis-cernmentofitsfinaltectonothermalepisodeisvitaltounderstandingitsgeologicalhistory.Inrecentyears,an… 相似文献
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《地下水科学与工程》2021,(1)
正Aims and Scope Journal of Groundwater Science and Engineering aims to be an innovative,high-impact and authoritative academic journal for researchers across the hydrogeology,environmental geology,engineering geology,ecology and environment community.It mainly reports the latest and most important achievements in cutting-edge and emerging topics,as well as the traditional topics referring to new methodology,technology,applications and theoretical research in groundwater science and engineering.Papers published involve various aspects of research concerning groundwater,such as hydrogeology,environmental geology,engineering geology,urban geology,climate change,environmental change,ecology,water cycle,water resources,geochemistry,geothermy,agriculture,groundwater development and utilization,groundwater pollution,and research with supporting disciplines:Geophysics,geobiology,mathematics,numerical modeling,economics, 相似文献
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一.热液硫化矿床的一些分散元素热液矿床包括多数最重要的金属矿床,如Cu,Pb,Zn,Ag,Sb,Hg,Mo,W,U,Au等。除最后三种元素外,其余都以硫化物为主要存在方式。这些硫化矿物,除含上列元素外,还常常含有一些稀少的元素,如Cd,Ga,In,Tl,Gl,Re,Se,Te等,后者的含量和硫化物中 相似文献
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新疆柯坪地区志留系柯坪塔格组的遗迹化石 总被引：2，自引：0，他引：2
通过对柯坪地区剖面志留系的研究,在柯坪塔格组中已识别出遗迹化石15属20种,它们是：Asterichnus lawrencensis,Cochlichnus anguineus, Cruziana ichnosp., Cruziana qinlingensis, Cruziana rouaulti, Diplichnites bipartibilis,Gordia molassica, Helminthopsis abeli, Helminthopsis isp., Lockeia siliquaria ,Monocraterion cf. teataculatum, Palaeophycus tubularis, Planolites isp.,Planolites montanus, Planolites punctatus, Rusophycus ramellensis,?Scolicia ichnosp., Sagittichnus lincki,Spirophycus bicornis,Taenidium cameronensis。根据这些遗迹化石的组成、产状、分布规律及其围岩的沉积特征,可以划分为2种不同沉积环境条件下的遗迹组合,即(1)Helminthopsis-Gordia遗迹组合, 主要组成分子有Asterichnus, Diplichnites,Gorida, Helminthopsis, Planolites, Rusophycus,?Scolicia和Spirophycus,等,被解释形成于低能的滨外远岸浅海陆棚环境;(2)Cruziana-Rusophycus遗迹组合,常见组成分子有Cochlichnus,Cruziana, Lockeia, Palaeophycus,Rusophycus, Monocraterion,Sagittichnus,和Taenidium等,解释它们形成于滨外近岸浅海陆棚环境。 相似文献
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《《地质学报》英文版》2007,81(2):F0003-F0003
1. Papers should be devoted mainly to various aspects of research concerning geosciences and related disciplines in China, such as stratigraphy, paleontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new 相似文献
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Six Chinese ordinary chondrites (four of them have fallen in recent years and the trace element abundances have not yet been reported for the other two) were examined.The contents of 21 elements (Na,Cr,Mn,Sc,Se,Zn,Br,Ni,Fe,Co,Ir,Cu,Ga,As,Au,Sb,Os,W,Re,Pt,and Ru)in the magnetic fractions and 20 elements (Na,K,Ca,Sc,Cr,Mn,Fe,Co,Ni,Zn,Se,Br,La,Sm,Eu,Yb,Lu,Ir,Au,and As) in the non-magnetic fractions were de-termined by INAA. The results indicate that the 5 H-group chondrites show almost no difference in composition,but they are different from the Zhaodong L-group chondrite in elemental abundance.As a normalized element(relative to CI),the concentrations of Ga in the magnetic fractions can be used to classify ordinary chondrites(H-,L- and LL-group).The bulk composition and modal weight of each component calculated from element concentrations in different phases are in good agreement with the bulk rock analyses presented in the literature. 相似文献
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Ⅰ.INTRODUCTIONNorth China platform extends beyond Yinshan Mountains in the north,beyond HelanMountains in the west,to Qilian Mountains,Qinling Mountains,Funiu Mountains and DabieMountains in the south,and to the sea in the east.It covers the whole or part of Gansuprovince,Shannxi province,Ningxia Autonomous Region,Inner Mongolia Autonomous Re-gion,Shanxi province,Hebei province,Shandong province,Liaoning province,Jilin prov-ince,Jiangsu province,Anhui province,Henan province,Beijing Municipality,Tianjin MunieiPality, Bohai sea and Huanghai sea. 相似文献
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秦东稀有元素花岗伟晶岩某些地球化学特征 总被引：2，自引：0，他引：2
Taking a certain rare element-bearing granite-pegmatite in the Eastern Qinling Range for example, the author has generalized in this paper the distribution paterns, characteristic ratios, variation regularities and correlation of major elements(Si, Al, K, Na), charaeteristie elements (H F, P, B), miner elements (Ca, Fe, Mg,Mn) and rare elements (Li, Be, Rb, Cs,Nb, Ta) in genetic connection with granitepegmatites, 相似文献
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《《地质学报》英文版》2017,(6)
<正>1.Papers should be devoted mainly to various aspects of research concerning geosciences and related disciplines,such as stratigraphy,palaeontology,origin and history of the Earth,structural geology,tectonics,mineralogy,petrology,geochemistry,geophysics,geology of mineral deposits,hydrogeology,engineering geology,environmental geology,regional geology and new 相似文献
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《Scientia Geologica Sinica》1999,(4)
1.IntroductionBythepracticeofoilfielddevelOPment,itisgraduallyrecognizedthatmicroscopicheterogeneityismportanttOthefluidflowandporethroatheterogeneityisthemostboortantthings,becauseitaffectSthedisplacementefficiency.TherearemanymethodstostudyporestrUctUresuchasthinsectionmethod,capillarypressurecurveanalysis,imagealanalysis,fluorescencemicroscopeandsoon(LuoZhitan,1986;CatZhong,1993,QiuYinan,1996;PenShied,1998).Fromcapillarypressurecurve,wecangetsomeparametersaboutthroatandvolumeofporeinp… 相似文献
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如果把大洋钻探比作人生,那么50岁的国际大洋钻探,历经沧桑,砥砺前行,波澜壮阔,功成名就,但也正面临重整旗鼓,再次出发;而20岁的中国大洋钻探,风华正茂,后来居上,年富力强,踌躅满志,但在新世纪地球系统科学的号角声中,能否站在巨人的肩膀上,整装出发,打造全球视野,引领地球科学的前沿? 相似文献
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《Scientia Geologica Sinica》1999,(1)
1.IntroductionThecontinentalcrustandtheuppermantlehavebeenasubjectofmanytomographicstudiesofvanationsinp-wavevelocity.Duringtwodecaysthesestudiesprovidedvelocityimagesofthecrustandthemantleinsubductionzones,convergenceareas,faultbelts,volcanicareas,seismicareasandorogenicbelts(VanderHistetal.,I991,Spakman,1991;Aki&Lee,1976,LiuFutianetal.,1987;Iyer&Dawson,1993;Sun&Liu,1995;Sunetal.;1996,Liuetal.,1995).However,theseimagesleaveussomequestions.Forexample,howreliabletheyare?Ormorespecifically… 相似文献