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Petrogenesis and tectonic implication of the lower Silurian high-Sr/Y subvolcanic rocks from the South Qilian suture zone in the Qilian Orogen, NW China

Published online by Cambridge University Press:  01 March 2021

Xiaohu He ,
Changlei Fu Open the ORCID record for Changlei Fu [Opens in a new window] ,
Zhen Yan ,
Bingzhang Wang ,
Manlan Niu  and
Xiucai Li
Xiaohu He
Affiliation:
Department of Geology, School of Earth Sciences, Yunnan University, Kunming650091, China
Changlei Fu*
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing100037, China Key Laboratory of the Northern Qinghai–Tibet Plateau Geological Processes and Mineral Resources, Qinghai Geological Survey Institute, Xining810012, China
Zhen Yan
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing100037, China
Bingzhang Wang
Affiliation:
Key Laboratory of the Northern Qinghai–Tibet Plateau Geological Processes and Mineral Resources, Qinghai Geological Survey Institute, Xining810012, China
Manlan Niu
Affiliation:
Department of Resources and Environment, Hefei University of Technology, Hefei230009, China
Xiucai Li
Affiliation:
Department of Resources and Environment, Hefei University of Technology, Hefei230009, China
*
Author for correspondence: Changlei Fu, Email: fucl815@126.com
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Abstract

As the remnant of the South Qilian Ocean, the South Qilian suture zone recorded abundant information on the Cambrian–Ordovician subduction history of the southern branch of the Proto-Tethyan Ocean. However, the closure timing of the South Qilian Ocean and subsequent collision are poorly constrained. In this study, we report early Silurian (433–435 Ma) U–Pb ages of felsic subvolcanic rocks from Lianhuashan, Ayishan and Shihuiyao of the Lajishan district within the South Qilian suture zone. They intruded the Late Ordovician – Silurian sedimentary or Late Ordovician volcanic rocks and have high SiO2 (61.43–73.06 wt%), Sr/Y ratios with significant different rare earth elements (REEs) and trace-element spider diagrams, and Sr–Nd isotopic compositions, probably implying that they were formed through distinctly different generation mechanisms. Geochemistry of the Lianhuashan dacites reveals compositions typical of adakitic rocks derived from partial melting of lower crust in a thickened setting. The Ayishan dacites were derived from partial melting of crustal materials with the involvement of minor peridotite mantle, and the Shihuiyao rhyolites were derived from partial melting of felsic crust. The similar geochemical characteristics of coeval post-collisional igneous rocks in the Central Qilian and South Qilian blocks indicates that the lower Silurian subvolcanic rocks were generated in a thickened crust of post-collisional setting. Considering their intrusive contacts with Late Ordovician – Silurian retro-foreland basin and Late Ordovician collisional volcanic rocks, we propose that the South Qilian suture zone was at a transitional stage from collisional to post-collisional during the early Silurian Period.

Keywords

early Siluriansubvolcanic rocksthickened crustpost-collisionLajishanSouth Qilian suture
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 8 , August 2021 , pp. 1383 - 1402
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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