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Crust–mantle interactions in Zijinshan ore field identified by zircon SIMS U–Pb age and zircon Hf–O isotopes

Published online by Cambridge University Press:  26 September 2022

Wen-Hui Zhang ,
Shuai-Qi Yan  and
Li-Yuan Wang Open the ORCID record for Li-Yuan Wang [Opens in a new window]
Wen-Hui Zhang
Affiliation:
Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Shuai-Qi Yan
Affiliation:
Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Li-Yuan Wang*
Affiliation:
Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
*
Author for correspondence: Wang Li-yuan, Email: wangliyuan030101@163.com
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Abstract

This study presents zircon U–Pb geochronology and Hf and O isotope data for granitic rocks in the Zijinshan ore field, southwestern Fujian Province, China. The intrusive rocks comprise monzogranite, granite and granodiorite. The magmatic zircon U–Pb ages from these granitic rocks can be divided into four episodes: episodes 1 (157.9–159.9 Ma) and 2 (141 Ma) in the Late Jurassic and episodes 3 (108.1–103.2 Ma) and 4 (97.5–99.7 Ma) in the Middle and Late Cretaceous, respectively. Patterns of rare-earth elements (REE) show enrichment in light REE and obvious negative Eu anomalies. These rocks are also enriched in Rb, Th, U, La, Ce, Nd and Hf, and depleted in Ba, Nb, Sr, P and Ti. The increasing La/Yb ratio and decreasing heavy REE content with decreasing age may imply an increasing contribution of mantle-derived materials from the Late Jurassic to Cretaceous. The zircon ϵ Hf(t) and δ18O values, ranging from −37.7 to −2.8 and 12.0 ‰ to 6.3 ‰, respectively, indicate that the lower crust is an important source of granitic rocks. There was a significant increase in ϵ Hf(t) values and a decrease in δ18O values in the younger magmatic episodes (3 and 4), which ranged from −11.4 to −0.6 and 10.7 to 6.3 ‰, respectively. This suggests an increasing contribution of mantle-derived magma to the crustal melts from the Late Jurassic to late Early Cretaceous in response to the changing regional tectonic setting from compression to extension and an increasing interaction between the crust and mantle.

Keywords

SIMS zircon U–Pb ageHf–O isotopescrust-mantle interactionsZijinshan ore fieldgranite
Type
Original Article
Information
Geological Magazine , Volume 160 , Issue 2 , February 2023 , pp. 292 - 304
Copyright
© The Author(s), 2022. Published by Cambridge University Press

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