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Petrogenesis and tectonic setting of Late Devonian high-Mg andesites in the Beishan orogen, NW China

Published online by Cambridge University Press:  06 December 2021

Guo-Qiang Wang Open the ORCID record for Guo-Qiang Wang [Opens in a new window] ,
Xiang-Min Li ,
Ji-Yuan Yu ,
Tao Bu ,
Bo-Tao Huang  and
Yu-Jie Liu
Guo-Qiang Wang*
Affiliation:
Xi’an Center of China Geological Survey, Xi’an, 710054, Shaanxi, China Centre for Orogenic Belt Geology, China Geological Survey, Xi’an, 710054, Shaanxi, China Northwest China Center for Geoscience Innovation, Xi’an, 710054, Shaanxi, China
Xiang-Min Li
Affiliation:
Xi’an Center of China Geological Survey, Xi’an, 710054, Shaanxi, China Centre for Orogenic Belt Geology, China Geological Survey, Xi’an, 710054, Shaanxi, China Northwest China Center for Geoscience Innovation, Xi’an, 710054, Shaanxi, China
Ji-Yuan Yu
Affiliation:
Xi’an Center of China Geological Survey, Xi’an, 710054, Shaanxi, China Centre for Orogenic Belt Geology, China Geological Survey, Xi’an, 710054, Shaanxi, China Northwest China Center for Geoscience Innovation, Xi’an, 710054, Shaanxi, China
Tao Bu
Affiliation:
Xi’an Center of China Geological Survey, Xi’an, 710054, Shaanxi, China
Bo-Tao Huang
Affiliation:
Xi’an Center of China Geological Survey, Xi’an, 710054, Shaanxi, China
Yu-Jie Liu
Affiliation:
Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, Shaanxi, China
*
Author for correspondence: Guo-Qiang Wang, Email: gqwangmint@gmail.com
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Abstract

High-Mg andesites (HMAs) are crucial for the reconstruction of plate tectonics, continental margin formation and lithospheric evolution. In this study, we present new fossil age, whole-rock geochemical and Sr–Nd isotope data on the newly discovered Dundunshan Group HMAs in the Dundunshan area of the Beishan orogen (central-southern Central Asian Orogenic Belt). The Dundunshan HMA samples are characterized by high MgO (6.47–7.02 wt%) contents and high Mg# values (67.27–68.77), with SiO2 (58.57–62.13 wt%), Al2O3 (14.49–16.07 wt%) and CaO (5.05–6.24 wt%) resembling typical HMAs. The Dundunshan HMA samples are calc-alkaline and strongly enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), with slightly negative Eu anomaly and high-field-strength element (HFSE) depletions. Their (87Sr/86Sr)i ratios (0.7041–0.7057) and ϵNd(t) (3.73–5.59) indicate that the Dundunshan HMAs were mainly formed by the interactions between subducted oceanic sediment-derived melts and mantle peridotites. Fossil evidence and published radiometric age data constrain the formation of the Dundunshan HMAs to early Late Devonian time. Sedimentological features of the Middle Devonian Sangejing Formation and regional tectonic correlation suggest that the Hongliuhe–Niujuanzi–Xichangjing Ocean in the Dundunshan area was likely closed during late Middle Devonian time, and that the Dundunshan HMAs were formed in a post-collision extensional setting.

Keywords

high-Mg andesitesgeochemistrypetrogenesistectonic settingLate DevonianBeishanCentral Asian Orogenic Belt
Type
Original Article
Information
Geological Magazine , Volume 159 , Issue 4 , April 2022 , pp. 577 - 592
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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