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Late Jurassic to Early Cretaceous magmatism in the Xiong’ershan gold district, central China: implications for gold mineralization and geodynamics

Published online by Cambridge University Press:  09 October 2019

Zhenshan Pang ,
Fuping Gao Open the ORCID record for Fuping Gao [Opens in a new window] ,
Yangsong Du ,
Yilun Du ,
Zhaojian Zong ,
Jinsong Xie  and
Fengpei Xin
Zhenshan Pang
Affiliation:
Development and Research Center of China Geological Survey, Beijing100037, P.R. China
Fuping Gao*
Affiliation:
School of the Earth Sciences and Resources, China University of Geosciences, Beijing100083, P.R. China
Yangsong Du
Affiliation:
School of the Earth Sciences and Resources, China University of Geosciences, Beijing100083, P.R. China
Yilun Du
Affiliation:
Development and Research Center of China Geological Survey, Beijing100037, P.R. China
Zhaojian Zong
Affiliation:
School of the Earth Sciences and Resources, China University of Geosciences, Beijing100083, P.R. China
Jinsong Xie
Affiliation:
No. 1 Institute of Geological and Mineral Resources Survey of Henan, Luoyang471023, P.R. China
Fengpei Xin
Affiliation:
No. 1 Institute of Geological and Mineral Resources Survey of Henan, Luoyang471023, P.R. China
*
Author for correspondence: Fuping Gao, Email: [email protected]
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Abstract

The Xiong’ershan area is the third largest gold-producing district in China. The Late Jurassic to Early Cretaceous magmatism in the Xiong’ershan area can be divided into two episodes: early (165–150 Ma) and late (138–113 Ma). Laser ablation – inductively coupled plasma – mass spectrometry (LA-ICP-MS) zircon U–Pb dating yields ages of 160.7 ± 0.6 Ma and 127.2 ± 1.0 Ma for the Wuzhangshan and Huashan monzogranites in the Xiong’ershan area, respectively, representing the two magmatic episodes. The Wuzhangshan monzogranites exhibit adakite-like geochemical features (e.g. high Sr/Y ratios, low Yb and Y contents). Their Sr–Nd–Hf isotopic compositions are consistent with those of the amphibolites of the Taihua Group, indicating that the Wuzhangshan monzogranites were formed from partial melting of the Taihua Group metamorphic rocks. Compared to the Wuzhangshan rocks, the Huashan monzogranites have higher MgO, Cr, Co and Ni contents, but lower Sr/Y and Fe3+/Fe2+. All the samples from the Huashan monzogranites plot in the area between the Taihua Group amphibolite rocks and the mantle rocks in the (87Sr/86Sr)t vs εNd(t) and age vs εHf(t) diagrams, suggesting that the Huashan monzogranites were probably generated by mixing of mantle-derived magmas and the Taihua Group metamorphic basement melts. The gold mineralization (136–110 Ma) is coeval with the emplacement of the late-episode magmas, implying that crustal–mantle mixed magma might be a better target for gold mineralization compared to the ancient metamorphic basement melt. The data presented in this study further indicate that the transformation of the lithosphere from thickening to thinning in the Xiong’ershan area probably occurred between ~160 Ma and ~127 Ma, and that the gold mineralization in this area was probably related to lithospheric thinning.

Keywords

Late Jurassic to Early Cretaceous magmatismpetrogenesisgold mineralizationtectonic evolutionXiong’ershan area
Type
Original Article
Information
Geological Magazine , Volume 157 , Issue 3 , March 2020 , pp. 435 - 457
Copyright
© Cambridge University Press 2019

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