赵志丹岩石地球化学同位素示踪共73页
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1000 0569/2019/035(02) 0472 84ActaPetrologicaSinica 岩石学报doi:10 18654/1000 0569/2019 02 13云南腾冲全新世火山岩岩浆演化和岩石成因杨逸云 赵志丹 雷杭山 武精凯 苗壮 张双全 陈玲 季宏伟YANGYiYun,ZHAOZhiDan ,LEIHangShan,WUJingKai,MIAOZhuang,ZHANGShuangQuan,CHENLingandJIHongWei地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京 100083StateKeyLaboratoryofGeologicalProcessesandMineralResources,andSchoolofEarthScienceandMineralResources,ChinaUniversityofGeosciences,Beijing100083,China2018 09 01收稿,2018 12 15改回YangYY,ZhaoZD,LeiHS,WuJK,MiaoZ,ZhangSQ,ChenLandJiHW 2019 MagmaevolutionandpetrogenesisofHolocenevolcanicrocksinTengchong,Yunnan ActaPetrologicaSinica,35(2):472-484,doi:10 18654/1000 0569/2019 02 13Abstract TengchongvolcanicfieldisoneoftheareaswiththerecordsofHolocenevolcanosinChina ThemagmatismnatureandpetrogenesisofthisTengchongHoloceneVolcanics(THV)areessentialevidencesinrevealingthepresentsoutheastwardgrowthanddeepprocessesoftheTibetanPlateau Thispapercarriedoutmineralchemistryandwholerockgeochemistrystudyonthreevolcanos(Maanshan,Heikongshan,andDayingshan)oftheTHV,anddiscusstheoriginanddynamicsofthemagmatism ThemajorityoftheTHVarehighpotassiumcalc alkalinerocks,includingbasaltictrachyandesiteandtrachyandesite WefoundnegativecorrelationsbetweenSiO2andCaO,Fe2O3T,TiO2,MgO,andpositivecorrelationbetweenSiO2andK2O,whichindicatethefractionalcrystallizationofolivine,pyroxene,andplagioclase Thexenocrystsofplagioclasewithacidiccomposition(An=28)hasovergrowthbasicplagioclaserim(An=65),andxenocrystsofquartzwithnarrowpyroxenereactionrim,werefoundinthetrachyandesitesamples,whichpossiblysuggestthecrustalcontaminationbygranitoidcountryrockduringthemagmaupwellingprocessesinshallowlevelofthecrust Onthecontrary,thewholerockTh/Nbratioissmall(<1 16),whichreflectsaminoroverallcontamination TheTHVshowenrichmentinlargeionlithophileelement(LILE),anddepletioninhighfieldstrengthelement(HFSE),highTh/UandlowBa/Laratios,andenrichmentofSr Ndisotopes,whichasawholeimpliesthatthemagmashouldhavecomefromanenricheduppermantlethathaveexperiencedmetasomatismbysubductionofpelagicsedimentsoftheNeo Tethys TheTHVareformedinintraplatetectonicsettingofpost collisionregimeafterthecollisionbetweenIndiaandAsia Thevolcanosaredistributinginnorth southtrendingalongtheTengchongbasinanderuptedinlimitedvolume Consideringthehighlylocalizedextensionalongregionalstrike slipfaultsduringthelateralspreadingintheeasternTibetanplateau,thetriggeroftheTengchongHolocenevolcanicrocksmaybeinterpretedasresultingofthedecompressionmeltingoftheenrichedmetasomatizedmantlelithosphere Keywords Holocenevolcanicrocks;Tengchong;Fractionalcrystallization;Crustalcontamination;Continentalsubduction摘 要 腾冲火山岩区是我国全新世以来记载火山喷发的少数地区之一,该地区岩浆作用的性质与成因是揭示青藏高原东缘的现今侧向生长过程与深部作用的重要依据。
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第三章、第三章、岩石地球化学数据的处理与解释第一节、第一节、主量元素数据处理与解释第二节、微量元素数据处理与解释第二节、第三节、第三节、同位素数据处理与解释第三章、第三章、岩石地球化学数据的处理与解释第二节、第二节、微量元素数据处理与解释一、控制微量元素行为的地球化学规律二、稀土元素处理和解释三、微量元素处理和解释第三章、第三章、岩石地球化学数据的处理与解释第二节、第二节、微量元素数据处理与解释一、控制微量元素行为的地球化学规律痕量元素,微量元素(痕量元素,trace elements) 岩石中含量<0.1%的,的岩石中含量用ppm (μg/g 10-6), μg/g, 或者 ppb (ng/g 10-9)表示 ng/g, 表示国际单位使用的幂表示方法名称 atto femto pico nano micro milli centi deci 符号 a f p n μ m c d 数值 10-18 10-15 10-12 10-9 10-6 10-3 10-2 10-1 名称 deca hecto kilo mega giga tera peta exa 符号 da h k M G T P E 数值 10 102 103 106 109 1012 1015 1018第三章、第三章、岩石地球化学数据的处理与解释第二节、第二节、微量元素数据处理与解释一、控制微量元素行为的地球化学规律微观规律——地球化学亲和性、类质同象法则、微观规律——地球化学亲和性、类质同象法则、晶体场理论——地球化学亲和性(对过渡金属),归纳为:化学和晶体化学因素,包括对过渡金属),归纳为:化学和晶体化学因素,),归纳为原子(离子)的半径、配位数、原子和离子极化、原子(离子)的半径、配位数、原子和离子极化、最紧密堆积等宏观规律——体系性质和热力学规律的影响,宏观规律——体系性质和热力学规律的影响,如体系的化学——体系性质和热力学规律的影响组成、温度、压力、组成、温度、压力、氧化还原电位等微量元素行为的宏观表现矿物——是组成地球的基本矿物——是组成地球的基本——固体物质,固体物质,元素赋存在矿物之中,之中,通过矿物的形成和变化而具体体现。
1000 0569/2021/037(04) 1235 54ActaPetrologicaSinica 岩石学报doi:10 18654/1000 0569/2021 04 16福州复式岩体的成因:锆石U Pb年代学、地球化学及Hf同位素约束朱雪丽1,2 杨金豹3 侯青叶1 赵志丹1ZHUXueLi1,2,YANGJinBao3,HOUQingYe1andZHAOZhiDan11 中国地质大学地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京 1000832 陕西省矿产地质调查中心,西安 7100683 广西隐伏金属矿产勘查重点实验室,桂林理工大学地球科学学院,桂林 5410061 StateKeyLaboratoryofGeologicalProcessesandMineralResources,andSchoolofEarthScienceandResources,ChinaUniversityofGeosciences,Beijing100083,China2 ShaanxiCenterofMineralGeologicalSurvey,Xi an710068,China3 GuangxiKeyLaboratoryofHiddenMetallicOreDepositsExploration,CollegeofEarthSciences,GuilinUniversityofTechnology,Guilin541006,China2020 04 20收稿,2020 07 31改回ZhuXL,YangJB,HouQYandZhoZD 2021 PetrogenesisofFuzhoucompositepluton:ConstraintfromzirconU Pbgeochronology,geochemistry,andHfisotopes ActaPetrologicaSinica,37(4):1235-1254,doi:10 18654/1000 0569/2021 04 16Abstract ThepetrogenesisandoriginofI AtypedoublegraniteinFuzhoucompositeplutonhavenotbeenwellknown AsystematicstudyofzirconU PbchronologyandHfisotope,andwholerockgeochemicalwerecarriedoutonthecompositeplutoninFuzhou Theplutonisdividedintotwocategories:calc alkalineandalkaline LA ICP MSzirconU Pbdatingresultsshowthattheagesofcalc alkalinegranitesare111~101Ma,theseplutonsaretheproductsofmagmaactivityintheEarlyCretaceous;theageofalkalinegranitesare95~93Ma,whicharetheproductsoftheLateCretaceousmagmaticactivity AllsamplesinthestudyhaveEunegativeanomaly,characterizedbyLREEenrichmentandHREEloss,andtheyareallrelativelyenrichedinRb,Th,U,K,PbandotherLILE,depletedinBa,SrandhighfieldstrengthelementsNb,Ta,P,Ti Light heavyREEfractionationofcalc alkalinegranitesismoreobviousthanalkalinegranites However,comparedwithcalc alkalinegranites,thenegativeEuanomalyofalkalinegranitesismoreobvious TheresultsofzirconHfisotopeshowthattheεHf(t)ofcalc alkalinegranitesvaluesfromnegativetopositive,-3 9~0 2,andthecrustalmodelagesindicatethatthesourcerocksofgraniticmagmaderivedfromtheremeltingofNeoproterozoicancientcrust,withasmallamountofmantlecomponents TheεHf(t)ofcalc alkalinegranitesvalueis0 04~4 8,thecrustmodelagessuggestgraniticmagmaderivedfromtheremeltingofNeoproterozoicancientcrustandmixedwithalargenumberofmantlecomponents ComprehensiveanalysisshowsthattheI AdoublegraniteofFuzhoucompositeplutonhasthesamesource,butthedifferenceoftheformationistheresultsofcomprehensiveshapingofmanyfactorssuchasthechangesoftectonicenvironment,theadditionofmantle derivedmagmaandmagmaticevolutionKeywords Granite;Chronology;Geochemistry;I Adoublegranite;FuzhouCompositepluton摘 要 福州复式岩体I A型复合花岗岩的岩石成因与源区性质目前尚未得到很好认识。