简介：

简介：

简介：AnintegratedstudyofzirconU-Pbgeochronologyandpetrochemistry,togetherwithzirconLu-Hfisotopes,hasbeencarriedoutonthebasaltic-andesitictuffandvolcanicbrecciafromtheNamHangFormationandandesitictufffromtheMuang-NanFormationintheXaignabouliarea,whichhadbeenmappedasthePermian–EarlyTriassiconthe1:1000000geologicalmaporLateCarboniferousonthe1:200000geologicalmaps.ZirconU-Pbdatingofthreesamplesyieldedweightedmeanagesof235±2.6,232±1.4and278±2.8Ma,respectively,suggestingaLateTriassicoriginfortheNamHangFormationandanEarlyPermianoriginfortheMuang-NanFormation.Geochemically,theyarecharacterizedbydepletionsinHFSEs(e.g.,Nb,Ta,Ti)andhighLILE/HFSEratios,andtheyhavepositivezirconεHf(t)valuesof8.7–15.9,whichexhibitsthecontinentalarcvolcanicaffinityandpartialmeltingofsubductingoceanicslabinthemagmasource.Combinedwithspatialoccurrenceofthevolcanicrockandexistinggeochronologicalandgeochemicaldata,wesuggestthattheXaignabouli-LuangPrabangvolcanicbeltcanbelinkedtotheLoei-Phetchabunbelt.ThePermian–TriassicvolcanicrocksinthisbeltmightbeaproductoftheNanback-arcbasineastwardsubduction.

简介：<正>HEATFLOWANDACCUMULATIONOFOIL/GASPOOLSINORDOSBASIN,NWCHINASunShaohua(ChangshaInstituteofGeotectonics-AcademiaSinica,Changsha,410013,Hunan,China)heatflowfeild,petroleum,Ordosbasin.ThispaperfocusesontheheatflowfieldofOrdosBasin,NWChina,bycombin-ingexperimentmethodofU,KandTh,heatgeneration,heatconductivity,etc.Inthelightofthecomprehensivestudyoftheexperimentaldataandlayerdivisionsofthecrust,theaverageheatofMohoinOrdosBasinis0.37HFU,muchlowerthanthatinNorthChinaBasin(0.64-0.97HFU)orthatinSongliaoBasin(1.19HFU),NEChina,showingthecharacteristicsoftheheatflowfieldofthestablecratonicbasin.Theaverageheatflowonthecrustsurfaceofthebasinisabout1.44HFU,similartothatinMesozoicdiwaorogenyoftheworld,probablyindicatingthatthediwastageissoonexpectedinthebasin.TheinterfacesfromMohotothesurfaceinOrdosBasinhavethesameheatflowdistribution-stylewithth

简介：这篇文章试图在Tarim盆分析差错系统的开发，分发和进化的主要控制因素。基于地震侧面解释，钻的全面分析和地质的数据，也许在Tarim盆认出的六个差错系统，他们是南方Tianshan山的低岬差错系统，北Tarim高举差错系统，北方Tarim消沉差错系统，中央差错系统，西南Tarim差错系统，和东南Tarim差错系统。主要差别在Tarim盆在差错系统的发展，进化和分发存在，这被显示。亚差错系统能在差错系统的内部根据差错开发和分发的差别被认出。这被描绘多水平差错系统的微分开发和分发在Tarim盆存在。差错带在古生代的阶层发展了主要在内部在paleo高举和paleo斜坡散布Tarim盆，和差错带在床主要在外部低岬消沉开发的中央新生代发生了。带并且片断差错系统的微分开发和分发也在Tarim盆存在。Tarim差错系统的形成和分发具有控制机制的建筑群。多相的结构的运动和构造转变在Tarim盆控制差错系统的多相的微分开发和分发。多水平微分开发和分发被多水平分开带和地区性的不顺从控制。带并且分割先存在的地下室也许控制的Tarim差错系统的微分开发和分发结构的质地。在Tarim盆的差错系统的主要方向被联合的以后的阶段盆山脉控制。

简介：摘要：在北Qaidam盆的侏罗记煤措施的分发被地区性的结构显然控制。基于煤田探索的存在数据并且与煤田地下室结构，主要差错的特征，和煤措施的分发的分析结合了，这份报纸向前在北Qaidam盆带给煤田的一个计划构造师的单位和控制煤的结构的式样的定义。煤措施的分发的结构控制进一步被讨论。煤的分发从东方从北方测量进带状配列的特征到南方和块到西方的后来，Indosinian导致了的地区性的构造活动的几个阶段。结果显示结构的变丑在三的前面是最强烈的高举系上带子，它被戳的联合描绘。煤措施被高举到浅形成，并且对容易被利用，但是因为严重损坏，矿的规模是小的。相反，压力和紧张在三消沉是弱的，与主要是的控制煤的结构的式样戳褶层和戳单斜层联合。在消沉的煤的分发是相对稳定的。消沉的更浅的部分将在北Qaidam盆为煤资源的探索和开发成为关键区域。

简介：Pasveh斑粝岩是在西北Sanandaj-Sirjan地区的Pluto的建筑群的mafic部件。这些累积岩石由斜长石和钙的clinopyroxene(Cpx)组成，它产出不平常地高的CaO(>19wt.%)在整个岩石的化学。Petrographical和geochemical数据建议Pasveh斑粝岩能被划分成二个组：免费方柱石和忍受方柱石的斑粝岩。第二个组相对免费方柱石有更高的Na2O，K2O，和P2O5并且在LIL(大离子亲石元素)和HFS(高地力量)被充实元素。交代作用的二个阶段影响了mafic岩石的主要作文。第一，高温度反应引起了转换主要高Ticlinopyroxene到低Ticlinopyroxene+highTi闪石。这反应是广泛的并且包括了所有gabbroic样品。涉及这个过程的热水的液体能从国家岩石的脱水反应或从在Pasveh复杂pluton的形成合并的另外的岩浆被导出。第二个交代矿床阶段联系到gabbroic岩石的有限部分的scapolitization。外部盐的液体，主要NaCl和次要的KCl和P2O5部件镇静，局部地影响了Pasveh斑粝岩并且形成了第二个交代矿床阶段。Na和Cl的可能的来源是主要evaporites或盐水，它在斑粝岩的主人沉积是在场的。这些热水的液体的没有碳酸盐的性质建议为在Pasveh斑粝岩的方柱石的形成负责的热水的液体从海洋的evaporitic出身被导出。

简介：Microscopictomesoscopicstructuralinvestigationsandfoliationintersectionaxes（FIAs）preservedinporphyroblastsrevealaverycomplexhistoryofdeformationandtectonismwithinthesouthwesternpartofthewesternhinterlandzonealongthenorthernmarginoftheIndianplate,NWPakistan.D1,D2,andD3relatedstructuresinthesouthwesternpartresembletheF1/F2,F3,andF4relatedstructuresinthenortheasternpartofthewesternhinterlandzone.Thesestructuresdevelopedatthesametimethroughthesamechangesinthedirectionofbulkshorteninginsouthwesternandnortheasternpartsofthewesternhinterlandzone.FIAset1indicatesNW-SEshortening.TheD2fabrics,minerallineationsandfoldaxesindicateE-Wshortening.FIAset2,D3foldaxesandminerallineationsindicateNNE-SSWshortening.D3deformationeventisequivalenttotheF4deformationeventinthenortheasternpartofthewesternhinterlandzone.D4foldaxes,mineralstretchinglineationsandaxialplanefoliationsuggestENE-WSWshortening.TheD4NNW-SSEfabrics,whichformedintheregionaftertheformationoftheMMT（mainmantlethrust）,Khairabad-Panjalthrustfault,HissartangthrustfaultandMBT（mainboundarythrust）,likelyresultedfromENE-WSWbulkshorteningrelatedtodevelopmentoftheHazara-Kashmirsyntaxis.

简介：ThestudyareaislocatedatthenorthwesternAlvandplutoninnorthwestoftheSanandaj-Sirjanzone.TheSanandaj-SirjanzoneismetamorphicbeltwhichisrelatedtotheZagrosorogenicbelt.Graniticrocksinthisareais

简介：TheTriassicLowerKaramayFormation(T2k1)isoneofthemainoil-bearingstratigraphicunitsinthenorthwesternmarginofJunggarBasin(NWJunggar),China.Basedonanintegratedinvestigationofoutcrops,welllogsandseismicdataofNWJunggar,theLowerKaramayFormationissubdividedinto2sets,6bedsand13layers.Also,itisconsideredthatthealluvialfan,thebraidedriver,themeanderingriverandtheshore-shallowlacustrineweredevelopedduringtheearlyperiodofMiddleTriassicinKaramaydistrictsⅠ,Ⅲ.TheLowerKaramayFormationdepositsthefollowing9sedimentarysubfacies:thelowerfan,themiddlefan,theupperfan,thebraidedchannel,theoverflowbank,theriverfloodofbraidedriver,themeanderingchannel,theriverfloodofmeanderingriver,theshore-shallowlacustrine.Seventeenmicrofaciessuchasthebraidedstreamchannel,thealluvialsandfloodplain,thealluvialglutenitefloodplain,thewaterchannel,thechannelbaretc.havebeenidentifiedinsubfaciesaswell.Thethicknessofstrataisfirstlyup-thinningandthenthickeningupwardtothetop,itisaprocessfromlarge-scalelacustrinetransgressiontopartlylacustrineregression.Furthermore,themicrofaciesplanardistributinglawprovesthattheremainingoilmayenrichalongthemarginofmicrofaciesbecauseoftheplanarmicrofacieschanges.Therefore,thisresearchisbeneficialforsearchingremainingoilinNWJunggarandprovidinginformationtotheproject"TheSecondaryExploration"ofPetroChina.

简介：

简介：与构造进化结合了，一个多同位素的方法(D，18O，87Sr/86Sr和14C)并且hydrochemistry数据被用来在Guanzhong盆学习地热的水的起源和分类。当接受时，Xianli梯田的地热的水首先来自西北方向的学习表演再装。Xian城市里的地热的水的小数量供应来源从Qinling山和主要供应来源来自西方方向，而是地热的水Changan区域主要从Qinling接受供应山。基于地热的环境是开的，水岩石相互作用的度，和地热的水的起源，学习区域的地热的水能被划分成四种类型：A，Gushi消沉的地热的水，完美的关上的热环境和重要水岩石相互作用，属于剩余沉积的水起源；B，Xianyang城市的地热的水，好关上的环境和相对重要的水岩石相互作用，属于剩余与石块沥滤混合的沉积的水起源水；C，Xian城市的地热的水，半关上的环境和某水岩石相互作用，属于的石块沥滤水起源；D，Changan区域的地热的水，开的环境并且与现代降水混合了，属于的石块沥滤水起源。

简介：

简介：SHRIMPU/Pb-zircondataandNdmeancrustalresidenceagesindicatethatthelmatacaComplexdevelopedfromanArchean(≥3.2Ga)continentalprotolithwhichhasundergoneconsiderableisotopicdisturbanceplusandjuvenileaccretionduringlate-Archean(-2.8Ga)times.Transamazoniangranulitesexperiencedpeakmetamorphicconditionsof750-800℃,6-8kbarwithassociatedtranspressivethrustingandtectonicimbrication.Geochronologyonzircon,pyroxeneandgarnetconstrainsthetimingofpeakmetamorphismat1.98-2.05Ga.DiffusionmodelingofFe-Mgexchangebetweenbiotiteinclusionsandhostgarnetyields(nearmetamorphicpeak)coolingratesof50-100℃/Ma,withpetrologicalcoolingratesbeinggenerallyconsistentwithcoolingratesdeterminedfromgeochronology.CombiningtheretrogradeP-Tpathwithcoolingratessuggeststhatafterthemetamorphicpeak,largeportionsofthelmatacaComplexwereexhumedfrom30to17kmatarateof7-2km/Ma.Afterthis,exhumationratesprogressivelydecreasedastherocksapproachedthesurface.Rapidoverallupliftlerosionhadceasedwhentherockspassedbelow600-550℃at2.01-1.96Gaago.Observedvariationsinmineralcoolingagesareinterpretedastoreflectepisodicdifferentialtectonicexhumationwithinmajorfaultsystems.Inferred(maximum)agesoffaultre-activationgenerallycoincidewithmajorcontinentalaccretioneventsintheAmazonianCratonandreflectlong-termthermalevolutionofthelmatacaterrane,asconditionedbyvariableresponsetocontinuedcontinentalconvergenceduringtheProterozoic.

简介：对早二叠的A类型花岗石晚含碳广泛地在整个西方Junggar区域，NW中国，和Akebasitaopluton被散布极其在这些plutons之中被区分。在这份报纸，我们报导了新anisotropy磁性易受影响(AMS)数据与发出声音估计三维的形状和Akebasitaopluton的magmatic炮兵阵地机制的详细领域学习和听觉的magnetotelluric(AMT)结合。发出声音的地质的特征和AMT显示pluton从西北有岩浆的一个稍微倾斜的运动到东南，它是最可能的与塑造岩盖的上面的部分，和位于它的西北的部分以内的亚vertical根形成的更低的部分对应于一个不均匀的火炬，可能由趋势NEAnqi差错控制了。所有标本的AMS织物揭示低Pj价值(1.02的平均数)和低T价值(0.024的平均数)，建议AMS椭圆体的变丑是相对弱的。标本展出AMS椭圆体的过寺院生活、延长的形状。没有任何比较喜欢的取向，磁性的线条和生叶随机在整个pluton被散布。这些AMS模式显示pluton没有地区性的挤出在相对稳定的结构的环境形成了。因此，我们建议岩浆在到达了更浅的外壳层次经由的一个复杂炮兵阵地过程深差错并且随后占据了doming创造的房间，由在pluton房顶附近停止伴随了。另外，地区性的构造背景在Akebasitaopluton的炮兵阵地期间是相对稳定的，显示有压缩性的造山运动在期间的结束晚迟了在西方Junggar区域含碳。这个结论完美地与地区性的构造paleogeography，magmatic系统，和paleostress地与一致。

简介：

简介：Organic-inorganicinteractionsoccurringinpetroleum-relatedmudvolcanoescanhelppredictthechemicalprocessesthatareresponsibleformethaneemissionstotheatmosphere.SevensamplesofmudbrecciadirectlyejectedfromonecraterwerecollectedintheDushanzimudvolcano,alongwithoneargillitesampleoftheoriginalreddishhostrocksdistalfromthecrater,forcomparisonpurposes.ThemineralandchemicalcompositionsaswellasironspeciesofallsamplesweredeterminedusingXRD,XRFandM?ssbauerspectroscopy,respectively.Theresultsindicatethataseriesofmarkedreactionsoccurredinthemudvolcanosystems,morespecificallyinthemudbrecciawhencomparedtotheoriginalrocks.Changesmainlyincluded:(1)someconversionofclaymineralsfromsmectiteintochloriteandillite,andtheprecipitationofsecondarycarbonatemineralssuchascalciteandsiderite;(2)silicondepletionandsignificantelementalenrichmentofiron,manganese,magnesium,calciumandphosphorus;and(3)transformationofironfromferricspeciesinhematiteandsmectiteintoferrousspeciesinsiderite,chloriteandillite.ThesegeochemicalreactionslikelyinducedthecolorchangesoftheoriginalreddishNeogeneargillitetothegrayorblackmudbreccia,asaresultofreductionofelementsand/oralterationofmineralsassociatedwiththeoxidationofhydrocarbons.Ourresultsalsosuggestthatgreenhousegasesemittedfromthemudvolcanoesareloweredthroughaseriesofmethaneoxidationreactionsandcarbonfixation(i.e.,throughcarbonateprecipitation).

简介：

简介：Asuiteof1.84–1.92Gametamaficdykeswithintheparagneisssuite（khondalite）oftheQuanjimassifinNWChina,hasbeenchoseninthisstudyforfurtherunderstandingthetectonicevolutionandpossiblelinkstotheglobalColumbiasupercontinent.Occurrenceandfieldrelationssuggestthattheywereformedcoevallywithapreviousstudied1.83–1.85Gametamaficdykeswarms.Whole-rockmajorandtraceelementalgeochemistrysuggestsprecursormagmaoftheamphibolitesbeinggeneratedfromavolcanicarc-relatedtectonicsettingratherthanaback-arcenvironmentwherethemetamaficdykeswarmswereemplaced.ThemetamaficdykesshowenrichmentofLREEandstronglynegativeanomaliesforTa-Nb,Zr-HfandTi,havehighSiO2（49.3wt.%–52.5wt.%）butlowMgO（6.40wt.%–7.76wt.%）contentsandMg#（Mg#=[100×（MgO/40.3）]/[MgO/40.3+FeO/71.8]）values（45.7–52.1）,suggestingevolvedprecursormagma.ThehighvaluesofLa/Ta（22.2–42.8）andLa/Nb（1.71–2.47）,mildlynegativeεNd（t）values（-2.51–0.15）,withdepletedmantlemodelages（TDM）of2.45–2.84Ga,suggestthattheirprecursormagmaswerepossiblyderivedfromasubduction-relatedfluidmetasomatizedArcheansub-continentallithosphericmantle.Thisstudyprovidesfurtherevidenceforoceanicplatesubductionprevailingbeforeoraround1.85Ga,whichconfirmsaprolongedsubduction-accretion-collisionhistoryintheNWChinawhichispossiblylinkedtotheassemblyoftheColumbiasupercontinent.

简介：