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Geochemistry and zircon ages of the Yushigou diabase in the Longshoushan area, Alxa Block: implications for crust–mantle interaction and tectonic evolution

Published online by Cambridge University Press:  19 August 2020

Ren-Yu Zeng Open the ORCID record for Ren-Yu Zeng [Opens in a new window] ,
Jian-Qing Lai ,
Xian-Cheng Mao ,
Jie Yan ,
Chen-Guang Zhang  and
Wen-Zhou Xiao Open the ORCID record for Wen-Zhou Xiao [Opens in a new window]
Ren-Yu Zeng*
Affiliation:
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, Jiangxi, China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha410083, China School of Geosciences and Info-Physics, Central South University, Changsha410083, China
Jian-Qing Lai*
Affiliation:
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha410083, China School of Geosciences and Info-Physics, Central South University, Changsha410083, China
Xian-Cheng Mao
Affiliation:
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha410083, China School of Geosciences and Info-Physics, Central South University, Changsha410083, China
Jie Yan
Affiliation:
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, Jiangxi, China
Chen-Guang Zhang
Affiliation:
College of Geographic Science, Xinyang Normal University, Xinyang, Henan, 464000, China
Wen-Zhou Xiao
Affiliation:
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha410083, China School of Geosciences and Info-Physics, Central South University, Changsha410083, China
*
Author for correspondence: Jian-Qing Lai and Ren-Yu Zeng, Emails: ljq@csu.edu.cn; zengrenyu@126.com
Author for correspondence: Jian-Qing Lai and Ren-Yu Zeng, Emails: ljq@csu.edu.cn; zengrenyu@126.com
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Abstract

The North Qilian orogenic belt in North China has been defined as a subduction–collision zone between the Alxa Block and the Qilian Block. We present petrography, zircon U–Pb geochronology, major- and trace-element geochemistry, and Sr–Nd–Pb–Hf isotope analysis for the Yushigou diabase from the Longshoushan area, which is located SW of the Alxa Block, aiming to understand its petrogenetic link to subduction processes. The Yushigou diabase belongs to the tholeiite series, and shows enrichment in light rare earth and large-ion lithophile elements, and a depletion in heavy rare earth and high-field-strength elements. Laser ablation – inductively coupled plasma – mass spectrometry U–Pb zircon dating yielded an emplacement age of 414 ± 9 Ma, with an ϵHf(t) value in the range of −10.3 to 1.8. The whole-rock initial 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of the diabase range over 16.811–17.157, 15.331–15.422 and 37.768–37.895, respectively. The (87Sr/86Sr)i ratios vary between 0.7086 and 0.7106, and ϵNd(t) values vary between −14.4 and −13.4, which are significantly higher than the ϵHf(t) value (Nd–Hf decoupling). An interpretation of the elemental and isotopic data suggests that the Yushigou diabase was derived from partial melting of an enriched mantle I (EM-I) -type lithospheric mantle in the spinel–garnet transitional zone. Based on the geochemical features and previous regional geological data, we propose that the Silurian magmatism was most likely triggered by slab break-off after the closure of the North Qilian Ocean, and ancient continental materials from the subduction slab metasomatized the overlying lithospheric mantle during exhumation.

Keywords

North Qilian orogenic beltAlxa BlockdiabasepetrogenesisNd–Hf decoupling
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 4 , April 2021 , pp. 685 - 700
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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