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- Title
A Paleozoic mercury mineralisation event in South China: In situ U-Pb dating and chemical compositions of calcite from the Jianyan Hg deposit.
- Authors
Luo, Kai; Zhou, Jiaxi; Cugerone, Alexandre; Zhou, Meifu; Feng, Yuexing; Jin, Zhongguo; Zhao, Jianxin
- Abstract
The ages of hydrothermal Hg deposits are difficult to constrain because of the lack of suitable minerals for dating. The South China low-temperature metallogenic domain hosts numerous Hg deposits, including the Jianyan Hg deposit that is composed mainly of cinnabar and calcite. There are two stages of calcite in the deposit: syn-ore calcite (Cal-I) and post-ore/barren calcite (Cal-II). Cal-I is mainly euhedral-subhedral and fine-grained, has homogeneous grey luminescence, and is associated with cinnabar. Subhedral-anhedral Cal-II crosscuts Cal-I and is relatively coarse-grained. The syn-ore Cal-I has high U contents (0.1–1.3 ppm) and U/Pb ratios (up to 4.2), and is thus suitable for U-Pb dating. Using a laser ablation-inductively coupled plasma-mass spectrometer equipped with ion counters, we obtained a U-Pb age of 426.3±5.7 Ma (MSWD=1.5) for Cal-I. This age is interpreted to represent the timing of Hg mineralisation at Jianyan and is similar to ages of 440–400 Ma reported for many carbonate-hosted Pb-Zn and Ba-F deposits in South China. Based on the present results in combination with existing geochemical and geochronological data, we infer that these deposits belong to a Paleozoic Hg-Pb-Zn-Ba-F mineralisation system that was controlled by Caledonian tectonism.
- Subjects
CHINA; URANIUM-lead dating; CALCITE; PALEOZOIC Era; HYDROTHERMAL deposits; MERCURY; COUNTER-ions
- Publication
SCIENCE CHINA Earth Sciences, 2023, Vol 66, Issue 8, p1877
- ISSN
1674-7313
- Publication type
Article
- DOI
10.1007/s11430-022-1106-4