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Petrogenesis of the early Silurian Dashuang high-Mg basalt–andesite–dacite in eastern South China: origin from a palaeosubduction-modified mantle

Yuejun Wang, Huiying He, Chengshi Gan and Yuzhi Zhang
Journal of the Geological Society, 175, 949-966, 24 September 2018, https://doi.org/10.1144/jgs2018-102
Yuejun Wang
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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  • For correspondence: wangyuejun@mail.sysu.edu.cn
Huiying He
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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Chengshi Gan
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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Yuzhi Zhang
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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Abstract

The early Paleozoic Kwangsian event, the first compressive orogeny after the Rodinia assemblage in the South China Block (SCB), is characterized by the angular unconformity between the Devonian and pre-Devonian sequences and widespread granitoids and small-volume mafic rocks. However, the mechanism triggering this event is highly debated and the associated mantle source is poorly known. Our recent investigations identified the occurrence of early Silurian high-Mg basalt–andesite–dacite in the Dashuang area along the northwestern Yunkai Domain in the SCB. This study presents a set of new zircon U–Pb geochronological, whole-rock geochemical and Sr–Nd isotopic data for these volcanic rocks. They yield weighted mean 206Pb/238U ages of c. 430–443 Ma, similar to the age-peaks of early–middle Paleozoic magmatism and metamorphism in the SCB. These volcanic rocks have high MgO, Cr and Ni contents and Mg-numbers. They also exhibit arc-like geochemical affinities with crustal-like Sr–Nd isotopic compositions, similar to the Neoproterozoic high-Mg basalt–andesite in the eastern SCB. Such signatures, combined with other geological observations, suggest that the Dashuang high-Mg rocks were derived from an ancient (probably early Neoproterozoic) mantle wedge source. The early Paleozoic intra-continental reactivation in response to late-orogenic extension triggered the melting of this palaeosubduction-modified mantle, which led to the formation of these volcanic rocks.

  • © 2018 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 175 (6)
Journal of the Geological Society
Volume 175, Issue 6
November 2018
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Petrogenesis of the early Silurian Dashuang high-Mg basalt–andesite–dacite in eastern South China: origin from a palaeosubduction-modified mantle

Yuejun Wang, Huiying He, Chengshi Gan and Yuzhi Zhang
Journal of the Geological Society, 175, 949-966, 24 September 2018, https://doi.org/10.1144/jgs2018-102
Yuejun Wang
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
  • Find this author on Google Scholar
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  • For correspondence: wangyuejun@mail.sysu.edu.cn
Huiying He
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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Chengshi Gan
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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Yuzhi Zhang
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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Petrogenesis of the early Silurian Dashuang high-Mg basalt–andesite–dacite in eastern South China: origin from a palaeosubduction-modified mantle

Yuejun Wang, Huiying He, Chengshi Gan and Yuzhi Zhang
Journal of the Geological Society, 175, 949-966, 24 September 2018, https://doi.org/10.1144/jgs2018-102
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