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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 Open the ORCID record for Dong-Bing Wang [Opens in a new window] ,
Bao-Di Wang ,
Fu-Guang Yin ,
Zhi-Ming Sun ,
Shi-Yong Liao ,
Yuan Tang ,
Liang Luo  and
Zheng Liu
Dong-Bing Wang*
Affiliation:
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Bao-Di Wang
Affiliation:
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Fu-Guang Yin
Affiliation:
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Zhi-Ming Sun
Affiliation:
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Shi-Yong Liao
Affiliation:
Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
Yuan Tang
Affiliation:
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Liang Luo
Affiliation:
Chengdu Centre, Chinese Geological Survey, Chengdu 610081, China
Zheng Liu
Affiliation:
School of Resource Environment and Earth Science, Yunnan University, Yunnan 650091, China
*
Author for correspondence: Dong-Bing Wang, Email: wangdb06@163.com
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Abstract

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.

Keywords

A-typeback-arc settingLate MesoproterozoicWestern Yangtze Block

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Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 8 , August 2019 , pp. 1425 - 1439
Copyright
© Cambridge University Press 2019 

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