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

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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