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青海岗察岩体shrimp锆石u-pb年龄及其地质意义-岩石学报
10000569/2014/030(09)273948 ActaPetrologicaSinica 岩石学报
青海岗察岩体 SHRIMP锆石UPb年龄及其
地质意义
1,2 1 3
张涛 张德会 杨兵
1,2 1 3
ZHANGTao ,ZHANGDeHuiandYANGBing
1中国地质大学地球科学与资源学院,北京 100083
2青海省有色地质矿产勘查局七队,西宁 810007
3西部矿业股份有限公司,西宁 810001
1SchoolofEarthScienceandMineralResources,ChinaUniversityofGeosciences,Beijing100083,China
2No7TeamofQinghaiGeologicalExplorationBureauforNonferrousMetals,Xining810007,China
3WesternMiningGroupCompanyLimited,Xining810001,China
20140103收稿,20140717改回
ZhangT,ZhangDHandYangB2014SHRIMPzirconUPbdatingofGangchaintrusionsinQinghaianditsgeological
significanceActaPetrologicaSinica,30(9):2739-2748
Abstract TheGangchaintrusionsoftheQinghaiProvincearelocatedinthewesternsectionoftheWestQinlingorogenicbelt,
includingdiorites,granodioritesandporphyriticgranitesrocksAlthoughthedifferentsofthegeologicalandlithologicalcharacteristics,
theserockshavesimilarpetrogenesisandformation,andarederivedfromthesamesourceainmultistageTheGangchaintrusions
belongtoItypegranite,evolutingfromintermediatetofelsicDespiteagedatinghasbeencarriedoutinseveralstagesofrocks,the
precisegeochronologicaldatingarestillabsentforthewholerocksInthispaper,analyzingtheinteriorstructuresofzirconsbytheCL
206 238
technique,wereportnewsensitivehighresolutionionmicroprobe(SHRIMP)singlegrainzircon Pb/ Uisotopicagesofthe
GangchaintrusionsTheresultsshowthattheGangchaintrusiverockshaveundergonethreeintrusivestages,whichare2438~
242Ma,238~234Maand215MarespectivelyTherefore,theyarecognateandtheproductsofthemultistageofmagmapulsesThe
copper,gold,tungsten,molybdenumandirondepositsalongthemarginofGangchaintrusionshavecloserelationshipswiththe
GangchaintrusionsTheoreformingfluidandmaterialoriginatedfrommagmaMoreover,metallogenesisandtheformationofGangcha
intrusionsarecontemporaneousinthesamediageneticmetalloge
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