Adakite-type sodium-rich rocks in Awulale Mountain of west Tianshan:Significance for the vertical growth of continental crust

查看全文 作　　者：XIONG [1,2]Xiaolin;ZHAO [1]Zhenhua;BAI [1]Zhenghua;MEI [1]Houjun;WANG [1]Yixian;WANG [1]Qiang;XU [1]Jifeng;Niu [1]Hecai;BAO [1]Zhiwei

机构地区：[1]Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;[2]State Key Laboratory of Mineral Deposit Research of Nanjing University,Nanjing 210093,China

出　　处：《Chinese Science Bulletin》索引2001年第46卷第10期,共7页

基　　金：This workwas co-supported by the State Major Basic Research Program of China (Grant No. G1999043200); the State '305' Program of China (Grant No. 96-915-03-02); the Chinese Academy of Sciences (Grant No. KZCX2-102); the State Climbing Program of Chi 摘　　要：The sodium-rich dacites and albite porphyries of Permian in the Awulale Mountain of west Tianshan have unique chemical and trace element signatures identical to adakite. These intermediate-acidic igneous rocks are characterized by high Na2O, Al2O3 and Sr contents and high Sr/Y and La/Y ratios (>40 and >20, respectively), and low Y and Yb contents, and strong depletion in HREE, and positive Eu anomaly. The (143Nd/144Nd)i is in the range from0.51236 to 0.51248 and the εNd(t) is positive value (+0.79-+3.11); the (87Sr/86Sr)i is in the range from 0.7052 to 0.7054. These Nd and Sr isotopic composition features indicate that the source rocks of these adakite-type rocks are from a weakly depleted mantle, or a depleted mantle, but was contaminated by the crustal materials. These adakite-type rocks were most likely derived from the partial melting of new underplated basaltic rocks under the conditions of amphibo-lite to eclogite transition in the postcollisional environment of North Xinjiang during the Permian 关键词：AWULALE adakite-type ROCKS underplating VERTICAL GROWTH of continental crust.

相关文献

参考文献（39）
引证文献（26）
耦合文献（422）

参考文献(39)

引证文献(26)

耦合文献(422)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Adakite-type sodium-rich rocks in Awulale Mountain of west Tianshan:Significance for the vertical growth of continental crust

参考文献(39)

引证文献(26)

耦合文献(422)

用户提示