Middle Triassic post-orogenic extension on Hainan Island: Chronology and geochemistry constraints of bimodal intrusive rocks

查看全文 作　　者：TANG [1,2]LiMei;CHEN [1]HanLin;DONG [1]ChuanWan;YANG [1]ShuFeng;SHEN [1]ZhongYue;CHENG [1]XiaoGan;FU [1]LuLu

机构地区：[1]Department of Earth Science, Zhejiang University;[2]Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration

出　　处：《Science China Earth Sciences》索引2013年第56卷第5期,共11页

基　　金：supported China Postdoctoral Science Foundation (Grant No. 2011M500991);Basic Scientific Research Specific Foundation of Second Insitute of Oceanography, SIO (Grant No. JT1104) 摘　　要：This work studies new petrological and geochemical data and zircon U-Pb ages for bimodal intrusive rocks from Xinglong region, Hainan Island. Zircon U-Pb dating yields mean 238 U/ 206 Pb ages of 238 ± 2 Ma and 234 ± 2 Ma for diabasic and granitic phases, respectively, representing the Middle Triassic emplacement. The diabase and granite bodies were formed from discrete mafic and acidic magma sources that experienced local mechanical mixing at their mutual contacts. Although SiO 2 content of intrusions is bimodal, trace element ratios indicate that both were formed in a post-orogenic extensional setting. Sr-Nd isotopic composition reflects a shared EMII type enriched mantle source component, possibly influenced by subduction-fluid metasomatism. 关键词：中三叠世地球化学制约双峰式侵入岩后造山海南岛锆石U-Pb年龄年代学

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Middle Triassic post-orogenic extension on Hainan Island: Chronology and geochemistry constraints of bimodal intrusive rocks

参考文献(62)

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耦合文献(3339)

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