Genesis and open-system evolution of Quaternary magmas beneath southeastern margin of Tibet: Constraints from Sr-Nd-Pb-Hf isotope systematics

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• 作者：Haibo Zou^a ; ^b ; ^{Haibo.zou@auburn.edu} ; Mingjia Ma^a ; ^c ; Qicheng Fan^d ; Bei Xu^b ; Shuang-Qing Li^e ; Yongwei Zhao^d ; David T. King Jr.^a
• 关键词：Quaternary volcano ; Assimilation fractional crystallization ; Tengchong ; Continental subduction ; Indo-Asian collision
• 刊名：Lithos
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：272-273
• 期：Complete
• 页码：278-290
• 全文大小：2652 K
• 卷排序：272

文摘

Tengchong volcanic field is characterized by post-collisional high-K calc-alkaline series. Basaltic trachyandesites and trachyandesites formed by assimilation-fractional crystallization of mantle-derived magmas. The assimilants may mainly come from the lower crust. Relatively primitive trachybasalts formed by partial melting of a mantle source enriched by subducted clay-rich sediments. Tengchong magmas were generated by continental subduction of Indian slab coupled with recent regional extension.