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Syn-collision Biotite Hornblende Granodiorite from the Zedong Area,Tibet:Zircon U–Pb Isotope Chronology,Petro-geochemistry,and Geodynamic Significance

查看全文 作　　者：ZHU [1,2]Feilin;SHI [1,2]Zeming;XIONG [1]Fuhao;NI [1]Shijun;BAI [3]Mei 高影响力作者 机构地区：[1]College of Earth Science,Chengdu University of Technology,Chengdu 610059,Sichuan,China;[2]Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province(Chengdu University ofTechnology),Chengdu 610059,Sichuan,China;[3]Geological Survery lnstitute,Chengdu University of Technology,Chengdu 610059,Sichuan,China高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2017年第91卷第2期,共15页高影响力期刊 基　　金：financially supported by China Geological Survey(grant no.12120113095700,12120101000015001108);the National Science Foundation of China(grant no.41403039);the training program for young and middle aged backbone teachers of Chengdu Universcechnology(grant no.KYGG201502) 摘　　要：Cu–Au mineralization is rare in the Jurassic–Early Tertiary batholiths related to the India–Asia collision. Geochemical analysis and U–Pb isotope chronology was carried out on Shuangbujiere biotite hornblende granodiorite from the Zedong area. Zircon grains of the biotite hornblende granodiorite show oscillatory growth zonation and have high Th/U ratios of 1.08–2.39, indicating a magmatic origin for the zircons. Geochrological test yielded a LA-ICP-MS U-Pb age of 51.5±1.0 Ma, suggesting that the emplacement age of the biotite hornblende granodiorite is Early Eocene. The Shuangbujiere biotite hornblende granodiorites have geochemical features characteristic of adakite and are associated with a calc–alkaline metaluminous I-type granite enriched in Sr, high in Mg~#(49.6–54.9) and Sr/Y, and depleted in Y and Yb. These results indicate that this intrusion formation may have been associated with crustal thickening caused by the early collision of the Indian and Eurasian Plates. As the process of crustal thickening continued, the heating of the underplated basaltic magma caused the thickened lower crust amphibolite to dehydrate the melt and form a high-K calc–alkaline adakitic melt at about 848°C. Meanwhile, magma mixing of the underplated basaltic melt and high-K calc–alkaline adakitic melt formed a high-Mg# adakite representative of the sys-collisional tectonic setting. 关 键 词：U-Pb年龄 同位素地球化学 同碰撞 锆石 LA-ICP-MS 花岗闪长岩 高钾钙碱性 西藏
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