简介:Theadsorptiveremovalofarsenicbysynthetically-preparednanoFe-Mnbinaryoxides(FM)wasinvestigated.AnovelmethodusingpotassiumpermanganateandferricchlorideasrawmaterialswasusedtosynthesiseFM.ThemolarratioofFeandMninthesyntheticFe-Mnbinaryoxideswas4:3.TheFM-1andFM-2(preparedatdifferentactivationtemperatures)havinghighspecificsurfaceareas(358.87and128.58m2/g,respectively)wereamorphousandofnanoparticletypes.TheamountofarsenicadsorbedonFM-1washigherthanthatadsorbedonFM-2particles.AfteradsorptionbyFM-1,residualarsenicconcentrationdecreasedtolessthan10μg/L.Theadsorptionkineticsdatawereanalyzedusingdifferentkineticmodelsincludingpseudofirst-ordermodel,pseudosecond-ordermodel,Elovichmodelandintraparticlediffusionmodel.Pseudosecond-orderkineticmodelwasthemostappropriatemodeltodescribetheadsorptionkinetics.TheadsorptionpercentageofAs(Ⅲ)increasedinthepHrangeof2–3whileitdecreasedwiththeincreaseofpH(3
简介:塔里木盆地新元古代构造演化对显生宙成盆成烃作用研究具重要意义。通过锆石年代学研究结合新的钻探与地震资料进行构造解析,结果发现:1塔里木盆地内部发育峰值约770Ma的与超大陆裂解相关的强伸展构造活动,南华纪可能存在一系列近EW向展布的不连续断陷系统;2震旦纪晚期存在与"泛非运动"相关的广泛抬升剥蚀,与寒武纪存在大型的区域不整合,南北分带的构造体制不同。综合分析表明,塔里木盆地新元古代经历南华纪大陆裂谷-断陷期、震旦纪坳陷-挤压抬升期等4期构造演变,发育完整的强伸展-挤压构造旋回;新元古代具与显生宙显著不同的构造演化特征,震旦—寒武系间存在大规模构造-沉积间断。
简介:青西油田位于酒西盆地西部的青南凹陷,油田主体构造格局为窟窿山背斜和柳沟庄断鼻,储集体主要是下白垩统下沟组半深湖.深湖亚相泥云岩和扇三角洲前缘亚相砾岩.下沟组地层现今埋深大于4000m,处于晚成岩阶段。岩石胶结致密,属于特低渗储层.由于泥云岩具有纹层状结构和富含长石、石英等特殊矿物成分,以及铁白云石胶结的砾岩具有较强的刚弹性,在多期构造运动和成岩作用下,易形成顺层或切层裂缝网络、粘土矿物转化收缩缝网络、成烃演化微裂缝网络、溶蚀缝洞网络和构造裂缝网络等,构成油气运聚的网络,在流体封存箱和流体异常高压成藏机制作用下形成裂缝性油藏,油气富集在构造转折带、弧形断裂外侧、断裂交巨部位、背斜构造等应力集中和释放区.油藏含油气层段长,下沟组整体含油,油气富集程度差别大,裂缝是油气主要的渗流通道和重要的储集空间.由于岩石矿物成分复杂、裂缝类型及组合形式多样,故有效裂缝发育段的识别难度较大.该油藏具有井间产能相差悬殊、产量递减速度快、弹性产率差异大、酸化改造效果不一等特点.
简介:紫苏花岗岩呈岩体形式侵入于石炭纪地层中.又为碱长花岗岩侵入.紫苏花岗岩由斜方辉石、单斜辉石、铁橄榄石、条纹长石、石英组成.以正εNd为特征(εNd=+4.8-+5.8)矿物组成、结构和野外产状表明:这些紫苏花岗岩是火成成因的.温压计算估测其结晶条件是T=700~800℃,P=420~575kPa.紫苏花岗岩中有小的富云母包体和巨大的条带状捕虏体.前者被认为是残留体,后者与其围岩.火山碎屑岩相当.残留体中较低的εNd正值(εNd=+2.6-+3.5)要求新生的下部地壳是紫苏花岗岩的主要源岩:来自这些源岩的紫苏花岗岩的母岩浆在结晶前与一些来自于亏损地幔中的融体混合.该地区体积巨大的碱性花岗岩可能也来自相同的岩浆源,只不过它是在较浅的地壳深度上结晶的.
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:KarstrocksfromtheHuanglongFormationexposedatthemarginoftheEasternSichuanBasincanbedividedintofourtypes:slightlycorroded,moderatelycorrodedporous,intenselycorrodedbrecciatedandintenselycorrodedandreplacedsecondarycalcickarsticrocks.Thecarbon,oxygenandstrontiumisotopecompositionsofthevariouskarstrocksareanalyzedsystematicallyandcomparedtorockswithoutkarstcorrosion.Theresultsindicatethat(1)theHuanglongFormationintheeasternSichuanBasinwasarestrictedbaysuppliedandcontrolledbyfreshwaterinwhichmudmicriteandmud-dolomicriteexhibitlowδ13Candδ18Ovaluesandhigh87Sr/86Srratios;(2)alltypesofkarsticrocksinthepaleokarstreservoirsoftheHuanglongFormationintheresearchareaareaffectedbyatmosphericfreshwaterwiththeδ13Candδ18Ovaluesand87Sr/86Srratiosintheoriginalformationapproachingthoseofatmosphericfreshwater,whichreflectsancienthydrologicalconditions,fluidproperties,isotopicsourceandthefractionationeffect;(3)theintenselycorrodedandreplacedsecondarylimestoneisaffectedbyavarietyofdiageneticfluids,oftenreflectedbyδ13Candδ18Ovalues,whilethe87Sr/86Srratiosexhibitthestrongdegreeofthecorrosion;(4)aftercomparingthe87Sr/86Srratiosofeachtypeofkarstrock,thediageneticfluidsaredeterminedtobemainlyatmosphericfreshwater,anddependingonthestrengthofcorrosion,andthelow87Sr/86Srratiofluidsinthelayerwillparticipateinthekarstprocess.Thecarbon,oxygen,andstrontiumisotopesofdifferentkarsticreservoirscanprovidemeaningfulgeochemicalinformationforforecastingandevaluatingthedevelopmentanddistributionrulesoftheHuanglongFormationatthemarginoftheeasternSichuanBasinintimeandspace.更多还原