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Island-arc geochemical signatures of Cenozoic alkali-rich intrusive rocks from western Yunnan and their implication

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Abstract

Alkali-rich intrusive rocks in western Yunnan were derived from an enriched lithospheric mantle (EM II) source. The data available indicated they are alkali-rich (K2O + Na2O > 8wt%) and shoshonitic. Although formed in a within-plate environment they exhibit signatures of arc magmatic rocks, such as high amounts of LILE and LREE relative to the HFSE and HREE, and thus high Ba/Nb, Ba/Zr, Sr/Y, La/Yb ratios as well as mimic chondrite-normalized REE and primitive mantle-normalized trace element patterns of subducted sediments, and they fall in the collision- or arc-related tectonic setting field on all discrimination diagrams. This might suggest the enrichment be related to the substantial extent of sediment contamination by the Mesozoic Tethyan subduction processes.

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Authors and Affiliations

  1. Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002, Guiyang, China

    Wu Kaixing, Hu Ruizhong, Bi Xianwu, Peng Jiantang & Zhan Xinzhi

  2. Graduate School of the Chinese Academy of Sciences, 100039, Beijing, China

    Wu Kaixing

  3. Chinese Zhongmei Energy Source Corporation Ltd, 100011, Beijing, China

    Chen Long

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  1. Wu Kaixing
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  2. Hu Ruizhong
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This research was supported jointly by the Knowledge-innovation Program of the Chinese Academy of Sciences (KZCX2-101) and the National Natural Science Foundation of China (Grant No. 40071543).

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Wu, K., Hu, R., Bi, X. et al. Island-arc geochemical signatures of Cenozoic alkali-rich intrusive rocks from western Yunnan and their implication. Chin. J. Geochem. 24, 361–369 (2005). https://doi.org/10.1007/BF02873799

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