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Gold Science and Technology >

2024 , Vol. 32 >Issue 5: 768 - 780

DOI: https://doi.org/10.11872/j.issn.1005-518.2024.05.156

Composition of Gold and Other Elements in the Mesozoic Magmatic Rocks of the Jiaodong Peninsula and Their Implications for Gold Mineralization

  • Leilei DONG , 1 ,
  • Xin BAI 1 ,
  • Mingchun SONG 2
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  • 1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2. College of Earth Sciences, Hebei GEO University, Shijiazhuang 050031, Hebei, China

Received date: 2024-05-30

  Revised date: 2024-07-29

  Online published: 2024-09-19

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Abstract

The Jiaodong Peninsula is the largest gold-producing region in China，however，the sources of its substantial gold reserves remains uncertain.Analyzing the trace elements in pre-mineralization Late Jurassic Linglong-type plutons （Linglong，Kunyushan），Early Cretaceous Guojialing-type plutons （Guojialing，Congjia），syn- to post-mineralization Early Cretaceous Weideshan-type plutons，and the mafic dioritic enclaves within the latter two plutons reveals that these formations generally exhibit lower concentrations of elements such as Cu，Au，Ag，Sb，and As compared to the average values of the continental crust.Specifically，the gold content is typically below 0.5×10-9，aligning with prior test results and suggesting a depletion process of elements such as gold during magmatic evolution.Furthermore，a significant positive correlation is observed between the Cu/Ag ratio and Cu content in both Linglong-type and Weideshan-type samples.In Guojialing-type plutons and their enclaves，a positive correlation between the Cu/Ag ratio and Au content has been observed.This relationship suggests that during magma evolution，monosulfide solid solution continuously separates from the magma.Consequently，Mesozoic magmatic rocks exhibit lower Cu/Ag ratios and reduced metal content.The accumulation of these sulfides in the middle to lower crust forms an enriched source layer of gold and other elements，thereby providing ore-forming materials essential for gold mineralization in the Jiaodong region.The study also suggests that the separation of monosulfide solid solutions during magma evolution may be a common process，which could also explain why the continental crust is depleted in copper and other elements compared to the mantle.

Key words： Jiaodong; gold mineralization; sulfide accumulation; Linglong-type pluton; Guojialing-type pluton; Weideshan-type pluton

Cite this article

Leilei DONG , Xin BAI , Mingchun SONG . Composition of Gold and Other Elements in the Mesozoic Magmatic Rocks of the Jiaodong Peninsula and Their Implications for Gold Mineralization[J]. Gold Science and Technology, 2024 , 32(5) : 768 -780 . DOI: 10.11872/j.issn.1005-518.2024.05.156

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http://www.goldsci.ac.cn/article/2024/1005-2518/1005-2518-2024-32-5-768.shtml

感谢山东省物化探勘查院王润生、于林松、高晓丰和山东省地质矿产勘查开发局第六地质大队王斌等协助野外考察和采样。审稿专家对本文提出了宝贵意见和建议，谨此致谢！

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