简介：摘要：大气微粒（PM2.5）具有较小的粒径和较大的比表面积，因此它们可以轻松吸附金属、有机物、病毒、细菌和其他污染物，并且是严重影响空气质量和环境的有毒有害物质。近年来，作为大气环境的主要污染物，中国许多城市已经对PM2.5中金属元素的污染特性，分布水平和源分析进行了相应的研究。有效地从PM2.5中收集金属和类金属元素的方法的选择，具有高消化效率的预处理方法，具有简单、快速、准确、灵敏和强大的抗干扰能力的检测方法已成为当前PM2.5的元素分析。研究重点和热点领域。

简介：建立了以纳米二氧化钛（TiO2）作为吸附剂填充微柱，电感耦合等离子体质谱（ICP-MS）法测试Cu^2＋，Cd^2＋，Pb^2＋和Ni^2＋离子的分析方法．考察了不同pH值、洗脱液浓度、样品流速、体积和外源干扰离子的影响，实验结果表明在pH值8～10范围内待测离子可被TiO2定量吸附，2．0molL^-1HNO3可将吸附在微柱上的待测物完全洗脱，优化条件下本方法对溶液中Cu^2＋，Cd^2＋，Ph^2＋和M^2＋离子检出限分别为：0．02，0．01，0．01，0．02μgL～，相对标准偏差小于2％（n=7），富集系数50倍．对水系沉积物标准物质（GBW07310）的测定值与标准值相一致，方法具有简便、快速，灵敏度高，重现性好的优点，可满足河口水体与沉积物样品中痕量金属元素定量分析的要求．

简介：摘要：水作为生命之源，与大众日常生活息息相关。保证饮用水安全成为近些年重点关注内容，饮用水污染中常见的污染物以重金属及类金属元素为主，这也成为当前试验测定的主要对象。如今分光光度法、原子吸收光谱法等在饮用水检测中发挥重要作用，但这些方法更多适宜对单个元素进行分析，且检测周期较长、操作较为繁琐复杂。ICP－MS法可以同时对多个元素进行检测，具备高灵敏度和精准性，因此，该方法逐渐取代其他方法，成为饮用水中多种元素测定的常用方式。基于此，探究ICP－MS法测定饮用水中多种元素的效果有实际价值。

简介：TheShihugolddeposit,situatedintheTaihangMesozoicorogenoftheNorthChinaCraton(NCC),ishostedbyductile-brittlefaultswithinArcheanmetamorphiccorecomplex.Thedepositischaracterizedbygold-bearingquartz-polymetallicsulfidesveins.TheMapenggranitoidsstockandintermediate-basicdikesintrudedthemetamorphicbasementrocks,andarespatiallyrelatedtogoldmineralization.Detailedlaserablationinductivelycoupledplasmamassspectrometry(LAICP-MS)U-Pbzirconagesofthegraniticrocks,dykesandmineralizedquartzveinsinthestudiedarearevealitsmagmaticandmineralizedhistory.Themineralizedquartzveinscontaininheritedzirconswithagesofabout2.55Gaand1.84Ga,probablycomingfromthebasement.ThesetwoPrecambrianeventsarecoevalwiththoseinotherpartsoftheNCC.TheMapenggranitoidstock,thelargestintrusioninthearea,wasemplacedatca.130Ma,andiscoevalwithmagmaticzirconpopulationsfromdioritesandquartzdioritepophyritesinthesameregion.Theca.130MamagmatismandgoldmineralizationweremostlikelyrelatedtoanunderplatingeventthattookplaceintheTaihangorogenatLateMesozoic.Thetimingofgoldmineralizationwithrespecttofelsicmagmatismintheareaissimilartothoseobservedinothermajorgold-producingprovincesintheNCC.ThisepisodeissimultaneouswiththoseintheeasternmarginofNCC,indicativeofawidespreadlateYanshanianmetallogeniceventthatwasaresponsetotheEarlyCretaceouslithosphereintheeasternNCC,inwhichthemesothermalgolddepositswereformedfromsimilartectono-magmaticenvironments.

简介：对新疆和静县乔霍特铜矿一带巴音布鲁克组火山岩岩石学、岩石化学、岩石地球化学进行了研究总结,认为该火山岩为钙碱性系列的玄武安山岩-安山岩-英安岩-流纹岩组合,具低TiO2、MgO、高Al2O3,高Fe2O3/FeO比值及富钠贫钾的特点,形成于大洋岛弧环境;在流纹岩中获得（430.33±0.99）Ma的LA-ICP-MS锆石年龄,指示巴音布鲁克组时代为志留纪。

简介：斯弄多铅锌矿床位于南冈底斯-念青唐古拉成矿带北缘铅锌银多金属矿带上,该矿床铅锌矿化与矿区花岗斑岩密切相关,为典型的热液脉型-矽卡岩型铅锌矿床。为厘定其成岩成矿时代,本文对矿区花岗斑岩进行了锆石LA-ICP-MSU-Pb年龄测定。结果得到2组年龄,一组年龄介于(75.1±1.8)~(77.7±1.8)Ma之间,加权平均年龄为(75.7±0.9)Ma(MSWD=0.27,n=11),可能反映岩浆在岩浆房演化过程中结晶的锆石年龄;另一组年龄为(67.5±1.4)~(69.4±1.4)Ma,加权平均年龄为(68.8±1.2)Ma(MSWD=0.31,n=6),代表花岗斑岩真实的结晶年龄,这一花岗斑岩的年龄(68.8±1.2)Ma明显早于冈底斯带内主碰撞期形成的矽卡岩型矿床。结合该成矿带其他矿床的成岩、成矿年龄,本文认为南冈底斯-念青唐古拉成矿带在印-亚大陆碰撞早期或新特提斯洋壳俯冲晚期,也伴有较强的铅锌多金属成矿作用。

简介：

简介：天山东段古生代火山-沉积地层时代特别是变质事件的厘定对探讨天山古生代洋盆演化具有重要意义。本文首次对出露于哈密沁城地区的红柳沟组中的流纹岩进行了LA-ICP-MS锆石U-Pb测年,获得了锆石（U-Pb）年龄为（426±12）Ma（MSWD=0.31）,该年龄可以代表红柳沟组的沉积年龄。同时,获得变质锆石的加权平均年龄为（372±28）Ma（MSWD=0.021）,该期变质事件在天山普遍发育,可能与天山古生代洋盆碰撞有关。

简介：西准噶尔东部哈拉阿拉特山南麓乌尔禾地区新发现大量中基性岩墙群。岩墙群侵位于下二叠统佳木河组磨拉石建造中,展布方向与达尔布特大断裂延伸方向一致。岩墙群中采集的3个锆石U-Pb年龄样品测年结果分别为（286.3±4）Ma（n=18,MSWD=0.32,95%置信度）,（286.5±5.6）Ma（n=10,MSWD=0.3,95%置信度）和（283.6±2）Ma（n=6,MSWD=0.57,95%置信度）,误差范围内基本一致,据此确定该岩墙群形成于早二叠乌拉尔世（Cisuralian）亚丁斯克期（Artinskian）。中基性岩墙群具鲜明的与岛弧俯冲作用有关的地化特征,做为西准东部俯冲造山的地质记录,测年结果表明,西准东部的俯冲造山作用明显滞后于西部,整个西准地区俯冲造山作用结束的最终时限为早二叠世晚期。

简介：Themulti-stageintrusionsofintermediate-acidmagmaoccurintheBangpuminingdistrict,thepetrogenicagesofwhichhavebeenidentified.Thetimesandsequencesoftheiremplacementhavebeencollatedandstipulatedindetailinthispaperbyusingthelaserablation-inductivelycoupledplasma-massspectrometry(LA-ICP-MS)zirconU-Pbdatingmethod.Theagesofbiotitemonzogranitethatwereformedbeforemineralizationinthesouthwestofthisminingdistrictare70±1Ma(meansquareofweighteddeviates(MSWD)=9.5,n=8)and60.60±0.31Ma(MSWD=3.8,n=16),whichbelongtothelateCretaceous-earlyPaleoceneinage.Thatmeans,theyareproductsofanearlytectonicmagmaticeventofthecollisionbetweentheIndianandAsiancontinentals.Theagesofore-bearingmonzograniteporphyryandore-bearingdioriteporphyriteare16.23±0.19Ma(MSWD=2.0,n=26)and15.16±0.09Ma(MSWD=3.9,n=5)separately,whichbelongtothemiddleMioceneinage;namely,theyareproductsoftheGangdesepost-collisionextensionalstagewhencrust-mantlematerialsmeltedandmixedaswellasmagmaticintrusionsimultaneouslyoccurred.Somezirconswithagesof203.6±2.2Ma(MSWD=1.18,n=7)werecapturedintheore-bearingdioriteporphyrite,whichshowsthattherehadbeentectono-magmaticeventsinthelateTriassic-earlyJurassic.Molybdenum(copper)ore-bodiesproducedinthemonzograniteporphyryandcopper(molybdenum)ore-bodiesproducedinthedioriteporphyritearethemainoretypesinthisoredeposit.ThemodelagesofRe-Osisotopicdatingforthe11molybdeniteare13.97-15.84Ma,whileisochronagesare14.09±0.49Ma(MSWD=26).Theisochronagesofsevenmolybdenitefrommolybdenum(copper)orewithmonzograniteporphyrytypeare14.11±0.31Ma(MSWD=5.2).Thereisgreaterrorintheisochronagesoffourmolybdenitefromcopper(molybdenum)orewithdioriteporphyritetype,andtheirweightedaveragemodelagesof14.6±1.2Ma(MSWD=41),whichgenerallyrepresentthemineralizationage.TheresultsabouttheR

简介：2014年云南景谷先后发生MS6.6、MS5.8和MS5.9中强地震，云南强震动台网获取了丰富的加速度记录。本文整理了各次地震中固定台和流动台获取的强震动加速度记录资料，分别进行了地震动衰减关系和加速度反应谱分析，结果表明，所观测到的加速度峰值比云南地区地震动衰减关系预测值高，反应谱谱值随震级的增加有增大趋势。最后将益智强震台作为典型台站，分析了该台站在地震中的场地放大效应。

简介：SignificantanomalieswereobservedatthegeomagneticstationsinthesouthwestregionofChinabeforetheYingjiangMS6.1earthquakeandtheLudianMS6.5earthquakein2014.Weprocessedthegeomagneticverticalcomponentdiurnalvariationdatabythespatialcorrelationmethod.TheresultsshowthatduringtheperiodfromApril1toMay20,2014,thereexistedquasi-synchronousdecreasechangesinthecoefficientcurvesbetweenthefivegeomagneticstationsofGuiyang,Hechi,Nanshan,Muli,YongningandXinyiandHongshanstations.Furthermore,therewasahighgradientzoneinthenormalizedcorrelationcoefficientcontourmapwithbackgroundvaluesremoved.TheepicentersoftheYingjiangMS6.1earthquakeandtheLudianMS6.5earthquakearelocatedinthegradientzoneornearthegradientzone.

简介：Theearthquakestress-dropvaluesoftwosequenceswereaccuratelycalculatedaftertakingawaytheeffectsduetoregionalearthquakeanelasticattenuationandstationsiteresponse,usingwaveformdataandseismicphasedataofsequencesoftheJingguM_S6.6,andLudianM_S6.5earthquakesinYunnan.Theseresultsshowthatthestressdropwithmagnitudeincreaseswithinthescopeofthisstudyofmagnitude.Aftereliminatingtheinfluenceofthemagnitude,theaveragevalueofstress-dropintheJinggusequenceishigherthanthatoftheLudiansequenceatthesamemagnituderange.Thismayberelatedtothestressstateindifferentregions.Intermsofthechangesoftimeandspaceofstress-drop,beforeM_S5.8strongaftershock,thestress-dropis'slowingdown-turningup-keepingahighvalue'afterthemainshock,meanwhile,almostalloftheabnormallyhighstressdropvalueisdistributedaroundtheM_S5.8strongaftershock,showingthatthestressenvironmentintheregionwasincreasingafterthemainshock.AndaftertheM_S5.9strongaftershock,stress-droprapidlydeclinestoarelativelystablestate,meanwhile,thehighvalueofstress-dropisdistributedaroundthestrongaftershock,showingthattheregionaltectonicstressgetsmorefullyrelease,itsstressenvironmentbeginstorapidlydecrease.FortheLudiansequencewithoutastrongaftershockoccurring,theaveragevalueofstressdropislowerthanthatoftheJingguearthquakesequenceatthesamemagnituderange,whileatthesametime,thestress-dropoftheaftershocksequencealmosthasn'tchangedmuch.Inthetimeafterthemainshock,combinedwiththereleasecharacteristicsofthemainenergy,thestressintheregionisexcessivelyreleased,thesubsequentstressintheregiongraduallyreturnstonormal.ThismaybethereasonwhytheactivityofLudianaftershockssignificantlywasweakerandsubsequentlytherewerenostrongaftershocksoccurred.

简介：Inthispaper,thebasicconditionsandcharacteristicsoftheDatong-Yanggaoearthquakearedescribedindetail.Thetypeoftheearthquake,theaftershockactivity,theearthquaketrend,thecharacteristicsofdamageareanalyzedanddiscussed.Thisearthquakebelongstoasequenceofearthquakeswarmtypeandisoftheconcentratedlyoccurringcharacteristicsofseveralmainshocksinatimesequence,andtheaftershockactivitywasnormallyattenuated.Becauseoftheunreasonabledesignofbuildingsandrepeatedvibrationbyseveraldestructivemainshockswithinashortperiod,thedamageinthehighintensityregionwasaggravated.Theanalysisandthepredictionprocedureofthe1991Datong-Yanggaoearthquake(Ms=5.8)arealsobrieflygiven.

简介：在1954年2月11日，有Ms7.3的地震发生在Hexi走廊的Shandan县，韦斯特中国。它是在在1949以后的西北中国的第一大地震。地震留给了47个人死者，伤害的332个人和几万个人无家可归者；将近7277座大楼被损坏或崩溃并且性质损失在不平的估计是超过10亿Ynan(RMB)。在meizoseismai区域，紧张是，Hongsihu盆和Shandan县是最严重的损坏，并且在Shandan，地震受灾的区域是4800km2。在纸，简短介绍被介绍给Shandan地震，包括基本参数，地震紧张的分发和自然环境。造破坏的特征特别地被讨论，地震灾难分发analysed.Finally展示，经济损失评估也是，象对地震和灾难减小的保护的含意一样的地震损坏，经验和课同样多的原因被总结。

简介：Ａｎａｌｙｓｉｓｏｆｆｏｒｅｓｈｏｃｋｓｅｑｕｅｎｃｅｏｆｔｈｅ１９７５ＨａｉｃｈｅｎｇｅａｒｔｈｑｕａｋｅｏｆＭｓ７．３Ｚｈａｏ－ＲｏｎｇＺＵＯ（左兆荣）；Ｊｉａｎ－ＰｉｎｇＷＵ（吴建平）ａｎｄＺｈｉ－ＬｉｎｇＷＵ（巫志玲）（Ｉｎｓｔｉｔｕｔｅｏｆ...

简介：ThegreatMs8.0Wenchuanearthquakehasbeenthemostdestructiveearthquakesince1949inChina.TheearthquakeoccurrednomorethanhalfayearaftertheestablishmentoftheNationalStrongMotionObservationNetworkSystem(NSMONS)ofChina;whatismore,theepicenterwaslocatedintheareawithdensestrongmotionobservationstationssothatalargenumberofstrongmotionrecordsofthemainshockwereobtained.Inthispaper,501strongmotionrecordsfrom167observationstationsareutilizedtoestablishthegroundmotionattenuationrelationsinthreedirectionsintherangeoffaultdistancelessthan600km.Theresultshowsthedifferenceofseismicmotionattenuationintwohorizontaldirectionsisinsignificant.Itisthefirsttimethatstrong-motionrecordsareusedtoestablishthegroundmotionattenuationrelationsoftheMS8.0earthquakeinChina.

简介：简单介绍了通渭地震台观测条件,并对通渭台近几年的地电阻率观测资料进行分析,发现2008年5月12日汶川Ms8.0级地震和2013年4月20日芦山Ms7.0级地震发生前,通渭地电阻率资料出现明显波动异常,波动异常持续1年多,震后恢复正常年变形态。

简介：OnOctober27,2001,alargeearthquakewithMs6.0,namedtheYongshengearthquake,occurredalongtheJinshajiangsegmentofChenghaifaultinYongshengCounty,YunnanProvince.ItisthelargesteventtooccuralongtheChenghaifaultinthelast200years.Theseismo-geologicalsurveyshowsthattheseismogenicfault,whichistheJinshajiangsegmentofChenghalfault,takesleft-lateralstrike-slipasitsdominantmovementpattern.Accordingtodifferencesinverticalmotion,motiontime,landformsandscales,theChenhalfaultcanbedividedintoeightsegments.TheJinshajiangsegmenthasaverticaldislocationrateof0.4mm/a,farlowerthanthemeanrateoftheChenghaifault,about2.0mm/a.It'sdeducedthatthetwosidesofJinshajiangsegment'stuck'tightlyandhinderedthestrike-slipoftheChenghaifault.ThestrongearthquakedistributionbeforethiseventshowsthattheJinshajiangsegmentwasintheseismicgap.TheChenghaifault,asaboundaryoftectonicsub-blocks,makestheNorthwestYunnanblockandtheMiddleYunnanblockmoveclockwise,andtheirmarginsmoveoppositelyalongtheChenghalfault.InthemotionprocessoftheChenghaifault,structuralhindranceandtheseismicgapofstrongearthquakesarepropitioustotheconcentrationandaccumulationofstructurestress.Asaresult,theYongshengMs6.0earthquakeoccurred.TheSujiazhuang-ShangangfusegmentissimilartotheJinshajiangsegmentwithalowverticalmotionrateof0.3mm/aandintheseismicgap.Soit'spostulatedthatthesegmentmaybecomeanewstructurehindrance,andtheYongshengMs6.0earthquakemaytriggertheoccurrenceoffuturelargeearthquakesalongthissegment.

简介：Thechangelawsofintensityofnearly200moderate-smallearthquakeswithMs=2.0~5.5occurringontheChinesemainlandsince1954havebeenanalyzedandarecomparedwiththatofmoderatelystrongearthquakes(Ms≥5.0).Theresultsshowthatthereisquiteobviousregionalityinthestatisticallawsbybothmoderate-smallearthquakesandmoderatelystrongearthquakes:attenuationofintensityinEasternChinaisslowerthanthatinWesternChinaandtheratioofthemajoraxistotheminoraxisofiso-seismallinesinEasternChinaissmallerthanthatinWesternChina.Theresultsalsoshowthatforafixedmagnitudetheattenuationofintensityofmoderate-smallearthquakesisfasterwhenintensityishigherthanV+andslowerwhenintensityislowerthanV-incomparisonwiththatofmoderatelystrongearthquakes.Furthermore,therealsohavebeensomedifferencesintheaspectsasintensity-magnituderelationbetweenstatisticallawsofmoderate-smallearthquakesandmoderatelystrongearthquakes.Thesedi