简介：本文重点研究了大别山潜山，牌楼地区榴辉岩Ｐ－Ｔ－ｔ轨迹，探讨了大别山地区榴辉岩成因，认为榴辉岩原岩主要是碱性玄武岩，少部分洋脊拉斑玄武岩岩浆早期结晶分异堆晶岩及部分钙质沉积岩。它们在华北与杨子板块碰撞时（２６０±３０Ｍａ），地壳向下俯冲到４０－６０ｋｍ处，温度５５０°－８３０°Ｃ，压力１．１－２．１ＧＰａ的条件下形成的。在构造抬升过程中，榴辉岩产生了角闪岩相、绿片岩相退变质作用，角闪岩相温压条件：４６０°－５７０℃，０．４－０．７ＧＰａ。流体包裹体研究表明：流体包体成分主要为ＮａＣｌ－Ｈ＿２Ｏ，Ｈ＿２Ｏ，ＮａＣｌ－ＣＯ＿２－Ｈ＿２Ｏ体系，变质作用过程从早至晚由氧化向还原环境转化。熔融包体的发现表明：榴辉岩形成具有局部深熔作用。从榴辉岩产状、岩石化学、地球化学特征表明本地区榴辉岩不是一种成因，同时具有Ｂ类、Ｃ类榴辉岩特征。

简介：在扬子地台西缘松潘－甘孜复合造山带东部的丹巴地区，发育一系列穹状变质体。据近年的研究，这些变质体至少经历了四期变形及相伴随的三期变质作用。利用变质反应、角闪石和二云母的矿物化学，矿物地质温压计及相关的同位素年龄资料，建立了丹巴变质体演化的Ｐ－Ｔ－ｔ－ｄ轨迹。此轨迹呈顺时针形式，反映了变质分带属于叠加复合型，黑云母带－蓝晶石带属于中压型。矽线石带则属低压高温型，即变质作用曾经历了增温增压，增温降压和恒压降温三个演化阶段，表明变质体具陆－陆碰撞的地壳加厚和随后花岗岩浆活化上侵的回返上隆的演化特点，这和区域大地构造背景相吻合。

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简介：WhileattendanceatpreviousIGC'swasremarkable,themorethan7,000earthscientists,exhibitorsandguestswhometinFlorenceforthe32^ndInternationalGeologicalCongresssetanall-timerecordasthehighestnumberofparticipants.Theycamefrom120countriesand75%werenotItalian.Thisproportionofforeignattendeeswasthelargestever;inlinewithatrendofincreasingnonlocalparticipation,ittestifiestothevitalityandinternationalcharacteroftheIGCs.

简介：ThereareobviousdifferencesinthemineralassemblageandmetamorphicP-TconditionsbetweentheeclogitesfromthenorthernandsouthernpartsoftheeasternDabieMountains.ThosefromthenorthernpartofthemountainsaredevelopedinAlpineperidotiteandgneiss.Theyhaveamineralassemblageofgarnet+diopsidewithnoquartz,andwereformedattemperaturesof600℃-740℃.Thosefromthesouthernpartaredevelopedingneissandmarble.Theyconsistofgarnet+omphacite+lessquartzandweremetamorphosedattemperaturesintherangeof650°-800℃.Thesedifferencessuggestthattheformermaybeformedduringthemetamorphismofthedeepsubductedoceaniccrust,whereasthelattermaybegeneticallyrelatedtothesubductionofthecontinentalcrustinthisarea.

简介：淮南矿务局潘三矿自建井以来共发生十多次煤及瓦斯突出，给煤矿生产造成严重危害，通过对典型实例的描述、结合矿井地质资料的分析，认为媒矿及瓦斯突出与矿区的地质构造带有直接的关系，且分布范围局限，建议对地质构造应力较为集中的地带进行监控、分析、预测。

简介：塔河油田C区位于油田西部,主要储、产油气层为下奥陶统,属于潜山碳酸盐岩储层类型,以构造溶蚀孔、洞、缝等次生孔隙为主的储集空间,使其成为具有双重或多重孔隙介质的特殊储层,非均质性明显.

简介：若拉岗日裂谷带位于拉竹龙-西金乌兰-金沙江结合带的中段，该带作为一条重要的大地构造分界线已被地学界所注目．在西金乌兰地区发现了蛇绿混杂岩带，在金沙江、甘孜理塘等地保留有较完整的洋壳残片（蛇绿混杂岩套）和岛弧火山岩建造，其西延的若拉岗日一带，没有见到这些地质体．基性岩（脉）和少量超基性岩脉是三叠纪热侵位的产物，地球化学等特征表明。它们不是MORB型基性岩，更多地体现板内裂谷特征：石炭系-下二叠统基性火山岩以碱性系列玄武岩为主，具裂谷型双峰式特征。岩石地球化学等特征表明，它们形成于板内或板内裂谷；酸性花岗岩类侵入岩极不发育，构造岩浆带不发育．

简介：TheTan-LufaultzonejoinstheDabieMountainsonitseasternmargin,andoffsetstheDabieandSuluorogenicbeltssinistrallyforabout500km.Onthebasisofcalculationoftemperatureandpressureexperiencedbythetwophasesofthefaultzoneaswellasthethermo-chronologicalinformationonmylonitefromtheearlierandlaterTan-LufaultzonesontheeasternmarginoftheDabieMountains,thispaperdiscussesthedelaminationhistoryandupliftingmagnitudesoftheDabieMountainsfromearlierJurassictoearlierCretaceous.Frommineralassemblages,mineraldeformationandmuscovite-chloritegeothermometrycalculation,itisknownthatthetemperatureexperiencedbythetwophasesofTan-Lufaultzonesarebetween400℃and450℃,andtheconfiningpressuresarebetween0.25Gpaand0.36GPafortheearliershearzonesand0.24-0.39GPaforthelateshearzones.AccordingtothegeobarometryofSi-in-phengiteandbyconsideringshearheatingandtectonicover-pressure,itisconcludedthatthemaximumformationdepthsforthetwophasesoftheductileshearzonesarenotmorethan12km.Differentialformationdepthsforthetwophasesofshearzonesare1-2kmatmost.Atabout190Maand128Ma,theTan-Lufaultzoneexperiencedtwophasesofcoolingevents.Duringthisperiod,theeasternmarginoftheDabieMountainsexperiencedatectoniccalmperiodandnouplifting.AccordingtoinformationfromtheTan-Lufaultzone,theupliftingmagnitudesoftheDabieorogenicbeltsarenotmorethan12kmduringtheearlierCretaceous.