简介：TheanalysesoflighthydrocarbonsinoilsfromtheTarimBasinshowthattheMango'sparameterKisaboutunityexceptthoseoilstrappedintheeasternpartoftheTazhong(CentralTarim)FaultUplift,TheregularvarianceofKmayindicatestheaccumulationandadmixtureoftheoilpopulationsintheeasternpartoftheTazhongFaultUplift.

简介：Sn-polymetallicoresatDachang,GuangxiAutonomousRegion,China,arehostedinMiddle-UpperDevonianreeflimestones,siliceousrocks,bandedandlenticularlimestones,etc.Twotypesoforebodiescanbedistinguishedaccordingtotheirtelationstothebedding:oneisdistributedalongthebeddingandthe.othercutsacrossthebedding.SnandsulfideorebodiesassociatedwithK-feldsparearemostlycharacterizedbylaminatedorestructure.MicroscopicexaminationsofK-feldspar-bearingrocks,inconjunctionwithX-raydiffraction,chemicalcomposiionandcathodoluminescencedataforK-feldspars,aswellastheirtelationstomineralization,theauthorsconsiderthattheK-feldspareareofauthigenicorigin,subordinatetotheepigeneticstageofdiagenesis,Theyresultedfromthereactionofmixed,deep-seated,circulatingundergroundhotwatersrichinK,AlandSiwithargillaceouscarbonatesduringtheIndonesianorogenicmovement.ItissuggestedmoreattentionshouldbepaidtotheeffectofauthigenicK-feldsparsonSnmineralization.Inthemeantimetheeventrelatedtocirculatingundergroundhotwatersshouldalsobetakenintoaccountsoastoprovidenewcluestoblindoreprospecting.

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简介：　　0引言　　世界上第一个Ar-Ar法实验室于1965年在美国加州伯克利年代学实验室建成[1].我国最早的Ar-Ar法实验室于1982年分别在北京中国科学院地质研究所和贵阳中国科学院地球化学研究所建成.到目前为止,国际上用于K-Ar和Ar-Ar法定年的标准物质约30个左右,绝大部分年龄为第三纪至寒武纪.大于6亿a的K-Ar法年龄标准物质只有英国标准Hb3gr角闪石(年龄1072Ma)和中国标准BSP-1角闪石(年龄2060Ma),这两个老年龄标准也是国际标准物质.　　……

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简介：ApotassiumsolubilizingbacterialstraindesignatedEGT,whichistolerantofhightemperature,wasisolatedfromanearthworm’sguttoobtainabacteriumthatcanweatherpotassium-bearingrockeffectivelythroughsolid-statefermentation.Molecularphylogenyand16SrRNAgenesequenceanalysisdemonstratedthebacterialstrainwasamemberoftheStreptomycesgenus.Toassessitspotentialtoreleasepotassiumfromsilicateminerals,thisstrainwasusedtodegradepotassium-bearingrockpowderbysolid-statefermentation.Afterfermentation,theamountofwater-solubleAl,FeandKofthesubstratewithactiveinoculumwashigherthanthoseofthecontrol,whichhadautoclavedinoculum,andthoseofthefreshsubstrate.Theresultindicatedthatthestrainhadtheabilitytoweatherpotassium-bearingrockandcouldbeusedasaninoculumintheproductionofpotassiumbio-fertilizer,duetoitspotassiumreleaseactivityfromrockandtolerancetohightemperature.

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简介：ThePbconcentrationsofatmosphericaerosolintheChukchiSeaoftheArcticvarywithintherangeof0.167-0.962ng/m3,withanaverageof0.532ng/m3.Theseconcentra-tionvaluesare200timeshigherthanthenaturalbackgroundvaluesofsnowsamplesthere.Cal-culationofthePbenrichmentfactorofaerosolindicatesthattheocean-andcontinent-sourceleadaccountfor9.23%and0.01%,respectively,butindustriallyreleasedPbaccountsformorethan90%oftheatmosphericPb.ThePbisotopiccompositionofaerosolhasrevealedthatthesourcesofleadfromindustrialleadthatcausespollutionincludemainlythewesternpartofNorthAmerica,EastEuropeandtheformerSovietUnion.ThecalculationofthetotalfalloutfluxofPbindicatesthatthemeanvalueofinputfluxintotheChukchiSeais0.02mgm-2a-1,equivalenttothatofsouthernPacificbutslightlylowerthanthatofnorthernIndianSeaandsouthernAtlantic.ItisevidencedthatthePbinputfluxintotheChukchiSeaisfarlowerthanthatofftheBalticSea,theNorthSeaandtheMediterraneanSea.

简介：2015年6月24日,由学会主办、吉林大学、中国科学院地球化学研究所、东北亚矿产资源评价国土资源部重点实验室联合承办的第15届学术年会在长春开幕。李世杰秘书长主持会议,胡瑞忠理事长致开幕词,吉林大学党委副书记兼副校长韩晓峰教授、吉林省国土厅周力厅长莅临大会并致辞。我会副理事长翟明国院士、徐义刚研究员、倪师军教授、邹才能研究员,我会上届副理事长王成善院士,我会理事、专业委员会委员、会员和广大科研、教学人员和青年学子以及产业部门和企业的科技人员近千名代表与会。

简介：神农架滑雪场位于国家级自然保护区的边缘地带.运用景观生态学原理和方法,采用3S技术,对滑雪场景观生态体系的结构和功能状况进行评价,通过景观多样性指数、景观聚集度指数等指标量化计算及比较分析,预测了项目建成后对所在区域生态完整性的影响程度及将造成的敏感生态问题.结果表明,评价区自然系统的生物量将减少430.26t,平均净生产力降低为881.55g/m^2·a,项目建设不会改变林地的模地地位,其对生态环境质量仍有较强的调控能力.3S技术结合景观生态学方法将生态环境影响评价由定性评价转向定量预测,为建设项目生态影响评价研究作了有益的探索.

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简介：通过国内外花岗岩体的412对角闪石-黑云母40Ar-39Ar年龄（tAr）与锆石U-Pb年龄（tZr）之间差值ΔtZr-Ar（tZr-tAr）进行的频数统计分析表明：ΔtZr-Ar呈对称正态分布（偏度系数CSK==-0.276,峰度系数CKU=16.52）;ΔtZr-Ar既呈正值又有负值,其众数值为0.70Ma,均值为1.15Ma。采用最小二乘法计算,花岗岩体锆石U-Pb年龄与花岗岩角闪石-黑云母40Ar-39Ar年龄拟合出相关系数很高（R=0.996）,回归系数接近l的线性回归方程（tAr=1.00453×tZr-1.932）。这些统计特征表明花岗岩角闪石-黑云母40Ar-39Ar定年测定结果与锆石U-Pb定年测定结果在允许的误差范围内是一致的,不存在花岗岩锆石U-Pb年龄〉角闪石40Ar-39Ar年龄〉黑云母40Ar-39Ar年龄的规律。结合Dodson＇s矿物封闭温度计算公式中存在问题的剖析,本文得出结论,按Dodson＇s公式计算得出的花岗岩矿物40Ar-39Ar封闭温度不能代表从花岗岩浆晶出造岩矿物40Ar-39Ar体系的封闭温度。