西秦岭夏河花岗岩的地球化学_年代学及地质意义_韦萍

《西秦岭夏河花岗岩的地球化学_年代学及地质意义_韦萍》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、1000-0569/2013/029(11)-3981-92ActaPetrologicaSinica岩石学报*西秦岭夏河花岗岩的地球化学、年代学及地质意义1，211＊＊11，31韦萍莫宣学喻学惠黄雄飞丁一李小伟1，211＊＊11，31WEIPing，MOXuanXue，YUXueHui，HUANGXiongFei，DINGYiandLIXiaoWei1.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.广西省地质矿产局第四地质队，南宁5300073.江苏省地质矿产局第四地质队，苏州2151291.StateKeyLaboratoryofGe

2、ologicalProcessesandMineralＲesources，SchoolofEarthScienceandＲesources，ChinaUniversityofGeosciences，Beijing100083，China2.TheForthGeologyProspectingTeamofGuangxiGeologyandMineralExplorationBureau，Nanning530007，China3.TheForthGeologyProspectingTeamofJiangsuGeologyandMineralExplorationBureau，Suz

3、hou215129，China2013-05-30收稿，2013-09-25改回.WeiP，MoXX，YuXH，HuangXF，DingYandLiXW.2013.Geochemistry，chronologyandgeologicalsignificanceofthegranitoidsinXiahe，WestQinling.ActaPetrologicaSinica，29(11):3981－3992AbstractXiahegranitoidsconsistingofmonzograniteandgranodioritearelocatedinWestQinling，Gan

4、suProvince，inwhichmaficmicrogranularenclavesarealsowelldeveloped.ThewholerockgeochemicaldatashowsthatthecontentofSiO2andtotalalkaliofmonzogranite(66.07%～69.18%，7.18%～7.69%，respectively)areslightlyhigherthanthoseofgranodiorite(60.18%～66.22%，4.73%～6.72%，respectively)，whilethecontentofAl2O3andC

5、aOofmonzogranite(15.21%～16.37%，2.23%～3.04%，respectively)arelowerthanthoseofgranodiorite(16.60%～17.39%，3.54%～5.86%，respectively).Thesegranitoids#characterizedbyhighMgvalue(withanaverageof55)，K2O/Na2O＞1andA/CNK=1.0～1.1belongtotheslightly-peraluminoushigh-Kcalc-alkalinerockseriesandshowsimilarg

6、eochemicalcharacteristicstoI-typegranite.Therocksareenrichedinlightrareearthelements(Ｒb，Ba，Th，UandK)anddepletedinNb，Ta，P，Tiandheavyrareearthelements，havingnoorweaknegativeEuabnormalityandawidevariabilityofthe(La/Yb)Nvalues(8.97～33.48).ThezirconU-Pbdatashowthattheemplacementageof8786Xiahegran

7、itoidsis244～248Ma，belongingtotheearlystageofIndonian.Thehigh(Sr/Sr)i(0.70714～0.70743)，lowεNd(t)206204207204(－6.21～－8.36)andhighradiogenicPbisotopiccompositions(Pb/Pb=17.850～18.003，Pb/Pb=15.489～15.510，208204Pb/Pb=37.815～37.931)indicatethatXiahegrani