东昆仑造山带东段早泥盆世侵入岩的成因及其对早古生代造山作用的指示-论文.pdf

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1、1000-0569／2012／028(o6)一1785-07ActaPetrologicaSinica岩石学报东昆仑造山带东段早泥盆世侵入岩的成因及其对早古生代造山作用的指示刘彬马昌前，张金阳熊富浩黄坚蒋红安LIUBin，MAChangQian'，，ZHANGJinYang，XIONGFuHa0，HUANGJianandJIANGH0ngAn1．中国地质大学地球科学学院，武汉4300742．中国地质大学地质过程与矿产资源国家重点实验室，武汉4300743．中国地质大学资源学院，武汉4300741．FaultyofEaahSciences

2、，ChinaUniversityofGeosciences，Wuhan430074，China2．StateKeyLaboratoryofGeologicalProcessesandMineralResources，ChinaUniversityofGeosciences，Wuhan430074，China3．FattyofResources，ChinaUniversityofGeosciences，Wuhan430074，China2012-02-01收稿．2012-04—15改回．LiuB。MaCQ。ZhangJY，XiongFH，

3、HuangJandJiangHA．2012．PetrogenesisofEarlyDevonianintrusiverocksintheeastpartofEasternKunlunOrogenandimplicationforEarlyPalaeozoicorogenicprocesses．ActaPetrologicaSinica，28(6)：1785—1807AbstractLargescaleofEarlyDevonianmagmatismwasIundinbotheastandwestpaasofEasternKunlunOm

4、gen．Butfewstudieswerefocusedonitsorigin，geod)namicmechanismandrelationshipwithProto-tethys．ThispaperrepotsatypicalEarlyDevonianintrusionfromtheeastpartoftheEasternKunlunOrogen，whichnamedYuejinshanintrusion．Theintrusionismainlycomposedofmonzogranite，granodiorite，somegabbr

5、oandcordierite-bearinggranite，inwhichthenatureofthefirstthreerocktypesisthestudyobjectofthispaper．Monzograniteandgranodioritesamplesareabsenceofhornblendeandcordierite，andarecharacterizedbyrelativelyhighcontentsofsiliconandpotassium，lowcontentsofiron，magnesiumandcalcium，

6、withmoderatealuminasaturationindex(A／NCK=1．0～1．1)andenrichmentoflargeionlithophileelements(LILE：Rb，ThandK)anddistinctdepletionofBa，sr，Nb，Ta，Ti，P，Eu，etc．，belongingtoperaluminousI-Stransitiontypegranites．Gabbrosarecharacterizedbysignificantlyhighcontentsofironandtitanium(t

7、hecontentsofFeOandTiO2are8．17％一12．70％and4．50％～6．54％，respectively)，relativelyhighCucontents(11．5×10一～30．6×10一)andCu／Nivalues(1．41—6．41)，enrichedinLREE(thevaluesof(La／Yb)NandLREE／HREEare1．94～3．15and2．65～3．48，respectively)，relativelylowMg(48～50)，Cr(3．8x10一。～60．4×10)andNi(1．

8、8×10。～12．5×10一。)，Nb-Ta—Tianomaliesrelativetoprimitivemantle．Monzogranitesandgranodioriteshaverelatively