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Geochemistry, zircon U–Pb geochronology and Hf isotope of the early Permian gabbro and high-Mg diorites from the Zhusileng–Hangwula Belt in the northern Alxa area: Petrogenesis and tectonic implications

Published online by Cambridge University Press:  11 August 2023

Wen Bing Deng
Affiliation:
Chinese Academy of Geological Sciences, Beijing, China School of Earth Sciences, China University of Geosciences, Wuhan, China Cores and Samples Center of Natural Resources, China Geological Survey, Sanhe, China
Zhao Gang Shao*
Affiliation:
Chinese Academy of Geological Sciences, Beijing, China
Hai Jin Xu
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan, China
Xuan Hua Chen
Affiliation:
Chinese Academy of Geological Sciences, Beijing, China
Jin Jun Yi
Affiliation:
Cores and Samples Center of Natural Resources, China Geological Survey, Sanhe, China
Su Jiang Zhang
Affiliation:
Cores and Samples Center of Natural Resources, China Geological Survey, Sanhe, China
*
Corresponding author: Zhao Gang Shao; Email: shaozhaogang@sina.com

Abstract

As the southernmost part of the central segment of the Central Asian Orogenic Belt, the northern Alxa area is characterized by abundant Permian magmatism and records key information on the geological evolution of the Palaeo-Asian Ocean. This study reports new zircon U–Pb and Lu–Hf isotopic and whole-rock geochemical data of the early Permian (285–286 Ma) Huisentala gabbro and Huodonghaer diorites from the Zhusileng–Hangwula Belt in the northern Alxa area. The gabbro is characterized by high Al, Ca, Mg# and light rare-earth elements, and low K, P and high field strength elements (e.g., Ti, Nb and Ta). Furthermore, the gabbro shows heterogeneous zircon ϵHf(t) value (−2.5 to +2.6). The Huodonghaer diorites show high MgO (3.46–6.32 wt%), Mg# (49–58), Sr (408–617 ppm) and Ba (223–419 ppm), and low FeOT/MgO (1.27–1.83) and TiO2 (0.48–0.90 wt%), with geochemical features similar to the high-Mg andesite/diorite. They show radiogenic zircon ϵHf(t) values of +1.2 to +4.9 and high Th/Nb ratios. These features suggest that the Huisentala gabbro and the Huodonghaer diorites were derived from the partial melting of mantle peridotite that was metasomatized by subduction-related fluids and by subducted sediment-derived melts, respectively.

Type
Original Article
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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