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Crustal growth event in the Cathaysia Block at 2.5 Ga: evidence from chronology and geochemistry of captured zircons in Jurassic acidic dykes

Published online by Cambridge University Press:  20 July 2020

Shuang-Lian Li
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
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
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
Elena A. Belousova
Affiliation:
ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
Tracy Rushmer
Affiliation:
ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
Le-Jun Zhang
Affiliation:
Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Private Bag 79, Hobart, Australia
Quan Ou
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 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, China
Chao-Yun Liu
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
*
Authors for correspondence: Jian-Qing Lai, Email: ljq@csu.edu.cn and Wen-Zhou Xiao, Email: lilzhou@csu.edu.cn
Authors for correspondence: Jian-Qing Lai, Email: ljq@csu.edu.cn and Wen-Zhou Xiao, Email: lilzhou@csu.edu.cn

Abstract

Six acidic dykes were discovered surrounding the Laiziling pluton, Xianghualing area, in the western Cathaysia Block, South China. A number of captured zircons are found in two of these acidic dykes. By detailed U–Pb dating, Lu–Hf isotopes and trace-element analysis, we find that these zircons have ages clustered at c. 2.5 Ga. Two acidic dyke samples yielded upper intersection point 206U/238Pb ages of 2505 ± 42 Ma and 2533 ± 22 Ma, and weighted mean 207Pb/206Pb ages of 2500 ± 30 Ma and 2535 ± 16 Ma. The majority of these zircons have high (Sm/La)N, Th/U and low Ce/Ce* ratios, indicating a magmatic origin, but some grains were altered by later hydrothermal fluid. Additionally, the magmatic zircons have high Y, U, heavy rare earth element, Nb and Ta contents, indicating that their host rocks were mainly mafic rocks or trondhjemite–tonalite–granodiorite rock series. Equally, their moderate Y, Yb, Th, Gd and Er contents also indicate that a mafic source formed in a continental volcanic-arc environment. These zircons have positive ϵHf(t) values (2.5–6.9) close to zircons from the depleted mantle, with TDM (2565–2741 Ma) and TDM2 (2608–2864 Ma) ages close to their formation ages, indicating that these zircons originated directly from depleted mantle magma, or juvenile crust derived from the depleted mantle in a very short period. We therefore infer that the Cathaysia Block experienced a crustal growth event at c. 2.5 Ga.

Type
Original Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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Crustal growth event in the Cathaysia Block at 2.5 Ga: evidence from chronology and geochemistry of captured zircons in Jurassic acidic dykes
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