A possible relict mantle wedge: Geochemical evidence from Paleogene volcanics in North China

作     者：Bolin Cong Jinghui Guo Wenjun Liu 

作者机构：Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2001年第46卷第22期

页      面：1917-1922页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：This work was supported by the Notional Natural Science Foundation of China (Grant No. 49872026) The samples of the Subei and Xialiaohe basins have been provided by Prof. Zhi, X. C. and Wu, T. S. The composition of trace elements and isotopes were meas 

主　　题：volcanics relict mantle wedge geochemistry Paleogene North China. 

摘      要：The major and trace element and isotopic composition were analyzed for the Paleogene volcanics in North China dated by the K-Ar method. The geochemical data show that most volcanics are in calc-alkaline series and the minor is in alkaline series. They differ obviously from Neogene and Quaternary volcanics in geochemistry. In particular, the Paleogene volcanics from the southern part of North China were derived from enriched lithospheric mantle (EMU), which were likely to be a relict mantle wedge formed during the subduction of the Yangtze plate into the North China plate in late Triassic (Indo- Sinian).