简介:Onthebasisofmineralparagenesisandthechemistryandhomogenizationtemperaturesoffluidinclusions,thephysicochemicalparameterswerecalculatedfortheformationoftheDalingkouAg-Pb-ZudepositinZhejiang.Fromtheearlytothelatestageofmineralizationtheore-formingtemperatureveriationwasfoundtobe298.5℃→267.0℃→217.6℃→167.3℃,withacorrespondingpHchangeof3.0-5.8→6.1→6.7→5.0→7.3.Thepressurechangedfrom403.8to128.5atm,andlogfS2-9.9→-11.2→<-15;logfO2<-44→-45.6--42.6→>-44.2;andlogfCO2around-1.55.Inconjunctionwithgeologicalobservations.thedepositisconsideredtobeofmeso-epithermalorigin,i.e.,itwasformedaftercontinentalvolcanic-subvolcanicactivity.ThemajorfactorsaffectingoreprecipitationarethedecreasingtemperatureandtheincreasingpHofore-formingsolutions.
简介:MetallogenicDynamicsofZhashuiAg-PbPolymetallicOreDepositinShaanxi,ChinaWeiJunhao;LiJianwei;WangSiyuan(FacultyofEarthResources...
简介:Itisawellknownfactthatmagnaticcryoto-explosion,asaspeeialformofmagmatismunderthenear-surfacecondition,hasacloseconncctionwithcdogcnicmctaldcposits,particularlywiththoseofporphyrytyPe,suchaSporphyryCu-Mo,Pb-Zn,W-SnandUdcposits’However,onlyinrcccntyearsbavetheChineseoregeologistsandpetrologistsgivenin
简介:Ithaslongbeenacontroversyaboutthesourceofore-formingmaterialsofAu-Agpolymetallicdepositsbothinmetallogenictheoryandinore-searchingpractice.IntermsofalargewealthoftheisotopicstatisticsdatafromIndosinian-YanshanianendogenicoredepositsinnorthernHebei(generallyreferringtotheareasalongthenorthernpartofTaihangMountainsandnorthernHebei,thesamebelow),itisconsideredthattheore-formingmaterialscamefromthedeepinterioroftheEarth,whichhadmigratedthroughplumestotheEarthsurfacewhileex-periencedmulti-stageevolutionandthenemplacedprogressivelyinfavorablestructurallocitoformores.Theirisotopedatashowthat559sulfurisotopicdatafrom40oredepositsare,forthemostpart,withintherangeof-5‰-5‰,withahighdegreeofhomogenization,indicatingthatthesulfurisderivedmainlyfrommagma;200leadisotopedatafrom37oredepositsindi-catethattheore-formingmaterialsareprincipallyofmantlesourcethoughsomecrust-sourcema-terialwasinvolved;96oxygen,hydrogenandcarbonisotopedatafrom34oredepositsillustratethattheore-formingfluidsaredominatedbymagmaticwaterwhileothersourcesofwaterwouldbeinvolved.Itmaythereforebeseenthattheformationofendogenicdepositshasnothingtodowiththestrata.
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简介:摘要随着市场经济的快速发展,公司的发展日新月异,为了公司的持续发展,为股东的利益以公司名义做担保的情况越来越普遍。担保作为一种帮助公司盈利的有效手段,也必然存在一定的风险。在现实实践中公司担保的效力应当如何认定?违法担保的相对人的审查义务应当如何界定?
简介:摘要 : 西气东输一线雅满苏压气站 SCADA 系统上位机 Viewstar 3.0 版本在投产运行后,预设报警值一直是使用比较繁琐的步骤来完成一项参数的设置,值班人员在交接班时需要对全站参数按照体系文件要求进行设置,这样设置一遍参数不仅时间比较长而且存在安全隐患,基于软件本身功能设计与研究,运用弹窗的方式显示界面,运用脚本形式完成显示界面的应用数据功能。因此本文档主要描述的内容是“一键”压力、温度、机组参数一键预设报警功能的设计与实现,该功能通过弹窗设计实现了下位机实时数据显示、计算预设报警值、应用预设报警值、屏蔽报警、全部选中和全部取消功能,最终实现快速且准确的预报警值的设置。
简介:WeperformedasystematictraceandrareearthelementanalysisforthebeddedFe-MncarbonaterocksrelatedtothestratiformAg-Pb-ZnmineralizationintheLengshuikengoredistrict,JiangxiProvince,SouthChina.ThreetypesofFe-Mncarbonatesaredistinguished,namely,themassive,breccia,andveintypes.Bothcarbonateandsilicatefractionsinthesamplesareanalyzedfortheirtraceandrareearthelementconcentrationsusingastepacid-leachingtechnique.OurresultsshowthatthecarbonatefractionsinthemassivetypesampleshavethelowestREEconcentrationsbutpronouncedpositiveEuandYanomalieswithEu/Eu*valuefrom1.3to6.2andY/Hovaluefrom40.1to59.5,andsimilarcharacteristicsarealsoshownforthesilicatefractionsinthemassivetypesamples(Eu/Eu*=1.0–6.7,Y/Ho=20.7–55.1).TheseREEcharacteristicsaresimilartothoseofSedextypemassivesulfidedepositsworldwide,andwesuggestthatthemassivetypeFe-Mncarbonaterockswerelikelyformedfromanexhalativevolcanic-hydrothermalfluidfeedingthedepressionbasinofavolcaniclake.Thehighconcentrationsofredox-sensitiveelementsandratiossuchasU/Th,V/CrandV/(V+Ni)indicateadysoxicenvironmentfortheFe-Mncarbonatedeposition.Incontrast,thebrecciatypeandveintypeFe-Mncarbonatesamplesshowdifferenttraceandrareearthelementfeaturesfromthoseofmassivetypesamples,andtheyaremoresimilartothevolcanicrocksandmagmatic-hydrothermalfluidsintheLengshuikengoredistrictandmayreflectstrongoverprintingfromvolcanicandsub-volcanicmagmatismrelatedtotheporphyrytypemineralizationinthedistrict.
简介: 【摘要】与其他行业相比,建筑施工企业有它自身的特点。如会计核算对象不同、成本对象的个别性、异地施工较多、施工复杂风险度高、施工期长和涉税事项多的特点。建筑公司形式有子公司、分公司和项目部,建筑公司要明确有所为和有所不为,本文通过描述它们的区别,确定它们的法律责任和税收政策的不同,并通过实例的形式进行了相应的会计核算和税务处理。
简介:摘要: PPP( Public-Private Partnership)模式是近年来兴起并引起社会各界广泛关注的一种新型政府和社会资本合作模式。为此,财政部下发了“财金 [2014]76号文”,要求尽快形成有利于促进政府和社会资本合作模式发展的制度体系。 PPP模式不仅仅是传统理解的一种融资模式,此模式带来的新生产物“项目公司”则赋予其携带管理模式属性。
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