峨眉山大火成岩省幔源岩浆底侵作用_省略_大老包花岗岩的年代学和热模拟证据_程黎鹿.pdfVIP

1000-0569 / 2013 /029 ( 10) -3533-39 Acta Petrologica Sinica 岩石 学报 峨眉山大火成岩省幔源岩浆底侵作用的地壳响应: * 来自大老包花岗岩的年代学和热模拟证据 1 1 1 1，2 1＊＊ 程黎鹿 曾铃 张帆 刘明 罗照华 CHENG LiLu1 ，ZENG Ling1 ，ZHANG Fan1 ，LIU Ming1，2 and LUO ZhaoHua1 ＊＊ 1. ; ， 100083 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 2. ， 7 10 100 武警黄金第五支队 西安 1. State Key Laboratory of Geological Processes and Mineral Ｒesources ; School of Earth Sciences and Ｒesources ，China University of Geosciences ，Beij ing 100083 ，China 2. No. 5 Gold Geological Team of CAPF ，Xi ’an 7 10 100 ，China 20 13-05-10 收稿 ，20 13-08-16 改回 . Cheng LL ，Zeng L ，Zhang F ，Liu M and Luo ZH. 2013. Mantle-derived magmas underplating and its effect on the crust in the Emeishan large igneous province :Evidence from geochronological study and numerical simulation of Dalaobao granites. Acta Petrologica Sinica ，29 (10):3533 － 3539 Abstract The Hongge Dalaobao granitic stock in the Emeishan large igneous province ，SW China ，shows spatical association with the giant Fe-Ti-V deposit-bearing mafic-lutramafic intrusion. This granitic intrusion is composed of medium- to fine-grained biotite monzonitic granite. In situ ziron LA-ICP-MS U-Pb age indicates that the age of monzogranite is 255. 1 ± 3. 6Ma ，which is consistent with the ages (255. 2 ± 3. 6Ma)by zircon U-Pb of peraluminous granites from Ailanghe. The ages show Dalaobao granites are related to the upwelling of the Emeishan plume. The age is 4Myr younger than the main stage (～ 260Ma)of the Emeishan volcanism. Based on the deep crustal hot zones ，the results of numerical simulation show that the partial melting of deep crust and the Dalaobao granites magmatism are triggered by conductive heat