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ID:32074670
大小:3.02 MB
页数:58页
时间:2019-01-31
《铜陵姚家岭矿区小青塘和沙滩脚岩体的年代学与地球化学特征》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、燕山晚火山岩的玄武沙滩脚iron-copper-gold-metalorebelt,AnhuiProvince,whereisanimportantcopper-iron-goldsulfurrichdepositsregion.ThereisaclosetemporalandgeneticrelationshipbetweentheformationofmetaldepositsofCu,PbandZninthethisregionandYanshanianmagmatierocks.TheresearchofthisthesisiSbasedon
2、thekeyscientificandtechnologicalresearchprojectofMinistryofEducation:Crust—mantleinteractionandporphyrymineralizationintheLowerYangtzeRiverregion.XiaoqingtangandShatanjiaoplutonswereselectedtoresearchingeology,petrology,geochronology,geochemistryandothercomprehensivecharacters.
3、BycomparingwiththeMesozoicintrusiverocksintheLowerYangtzeregion,geochronology,petrogenesisandmetallogenicspecializationarediscussed.Followingresultswasobtained:1.TheplutonsofXiaoqingtangandShatanjiao,whichisinthequasi·tectonicpositionofthejointareaofTonglingandFanchang,islocate
4、dinYaoJialingminingarea,Tongling.TheplutonsofXiaoqingtang,whichiswiththelengthofabout2km2,thewidthof300.500meters,anareaofabout0.75km。,iSbroadband.1ikedistributingto110—120O,thenorthernmarginofthecontactzoneoftheplutonstendstonorth,withdip30-500,andthesouthernmarginofthecontact
5、zonetendstosouth.withinclinationof60.800.ItoverlapsintheLowerPermianQixiaformationlimestoneofthemainplutonsofthegranodioriteporphyry.Theplutons,semi—circularshapedand5.5kmz,plant—likeinvasive,roughlytotheeastintothenortheast,iSlocatedonanticlinenorthwestsideDaigongshaninstructu
6、re.Theplutonsanditssurrounding,stronglyaltered,ismainlygranodioritelithology.2.TheprecisezirconLA—ICP-MSU—PbdatingofXiaoqingtangandShatanjiaogiveanmeanageof140.7士1.3and141.44-1.1Marespectively,belongingtoearlyCretaceous,whichmeettheagesofotherplutonsinTonglingarea.3.Theplutonsa
7、rehigh.Ktalc.alkalineserieschemically.ThecontentofSi02inXiaoqingtangplutonswas67.08%一68.57,wasrelativelyhigherthanitsinShatanjiaowhichis62.06%-65.53%.ThesamplesofXiaoqingtangandShatanjiaoplutonsshowthattheyareperaluminousandmetaluminousgraniteaccordingtotheA/CNK-A/NKrelationdia
8、gram.IntheHarkerdiagram,withtheincreasingofthecontento
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