Characteristics and tectonic setting of volcanic rocks in Early Cretaceous Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia

查看全文 作　　者：KONG [1]Yuanming;MA [1]Rui;HE [1]Zhonghua;YANG [1]Deming;WU [1]Qing;WANG [1]Yang

机构地区：[1]College of Earth Sciences,Jilin University

出　　处：《Global Geology》索引2014年第17卷第2期,共8页

摘　　要：The authors studied zircon LA-ICP-MS U-Pb dating,the zircon Hf isotope and geochemistry of acidic volcanic rocks in Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia,and discussed the chronology,source region and tectonic setting of the volcanic rocks in the studied area. The clear oscillatory zoning of zircons indicates a typical magmatic origin,and the results of dating show that the volcanic rocks of Baiyingaolao Formation were formed in Early Cretaceous( 121. 5 ± 1. 0 Ma). The features of major and trace elements show that the rocks are alkali-rich,poor in calcium and magnesium with enrichment in LILEs like Th,U,K and Gd and depletion in HFSEs,e. g. Nb,Ta,Sr and Ti. The fact implies that they were the products of partial melting of the crust. εHf( t) =( +6.30--+9.06) and TDM2= 600--835 Ma,suggest the magma originated from partial melting of the young crust. Combined with the evolution of regional tectonic structure,the authors conclude that the acidic volcanic rocks of Baiyingaolao Formation may be formed under the extensional environment related to the subduction of Paleo-Pacific Plate. 关键词：酸性火山岩构造环境早白垩世内蒙古 LA-ICP-MS 同位素地球化学地层地质构造演化

相关文献

参考文献（21）
引证文献（8）
耦合文献（482）

参考文献(21)

引证文献(8)

耦合文献(482)

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

Characteristics and tectonic setting of volcanic rocks in Early Cretaceous Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia

参考文献(21)

引证文献(8)

耦合文献(482)

用户提示