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Petrogenesis and tectonic implications of Late Mesoproterozoic A1- and A2-type felsic lavas from the Huili Group, southwestern Yangtze Block

Published online by Cambridge University Press:  08 January 2019

Dong-Bing Wang*
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Bao-Di Wang
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Fu-Guang Yin
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Zhi-Ming Sun
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Shi-Yong Liao
Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
Yuan Tang
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Liang Luo
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Zheng Liu
School of Resource Environment and Earth Science, Yunnan University, Yunnan 650091, China
Author for correspondence: Dong-Bing Wang, Email:


This paper presents new LA-ICP-MS zircon U–Pb chronology, whole-rock geochemical and zircon Hf isotopic data for the felsic lavas of the Huili Group from the southwestern Yangtze Block. LA-ICP-MS zircon U–Pb dating shows that these rocks were emplaced in Late Mesoproterozoic time (∼1028 to 1019 Ma). Relative to typical I-type and S-type granitoids, all the samples are characterized by low Sr and Eu, and high high-field-strength element contents, high TFeO/MgO, enriched rare earth element compositions and negative Eu anomalies, indicating that they share the geochemical signatures of A-type granitoid. They can be further divided into two groups: Group I and Group II. Group I are A1-type felsic rocks and were produced by fractional crystallization of alkaline basaltic magmas. The Group II felsic lavas belong to the A2-type and were derived by partial melting of a crustal source with mixing of mantle-derived magmas. Both Group I and Group II felsic lavas may erupt in a continental back-arc setting. The coexistence of A1- and A2-type rocks in the southwestern Yangtze Block suggests that they can occur in the same tectonic setting.

Original Article
© Cambridge University Press 2019 

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