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The Jiaodong Peninsula is the most important gold province in China, and the Liaoshang gold deposit represents a major recent prospecting breakthrough in Jiaodong. Based on detailed metallographic and microstructural observations, and He-Ar-Pb isotope compositions of fluid inclusions from main-ore-stage pyrite were presented, as well as the C-O isotope compositions of main-ore-stage dolomite. Fluid inclusions from the pyrite have 3He = 1.18 – 8.69×10-14 cm3STP/g, 4He = 1.21 – 3.24×10-7 cm3STP/g, and 3He/4He = 0.12 – 0.81 Ra, and the ore-forming fluid was mainly crustal-sourced with mantle fluid input. The fluid inclusions have 40Ar = 5.42 – 1.87×10-7 cm3STP/g, 40Ar/36Ar = 328.5 – 511.3, close to saturated meteoric water 40Ar/36Ar value. It is speculated that the crustal-sourced ore fluid may have had meteoric water input in the mineralization. The main-ore-stage dolomite contains δ13C = -2.9 to -4.4‰ and δ18OV-SMOW = 10.5 to 11.3‰. It is speculated that the carbon was mainly deep magmatic fluid- or magma-sourced. The pyrite has 206Pb/204Pb = 17.244 – 17.416, 207Pb/204Pb = 15.448 – 15.462, 208Pb/204Pb = 37.824 – 37.950, and 206Pb/207Pb = 1.116 – 1.125, indicating that the ore-forming materials were derived from a crust-mantle-mixed source, which we considered to be the Linglong granite and the Jiaodong (or Jingshan) Group wallrocks. We conclude that the ore-forming fluids and materials at Liaoshang have multiple and complex sources, and that the Mesozoic tectono-magmatic activities have a clear control on the formation and distribution of the Liaoshang gold orebodies.
|Journal||Ore Geology Reviews|
|Early online date||2 Feb 2023|
|Publication status||Published - Mar 2023|
Bibliographical noteFunding Information:
This study was financially supported by the National Natural Science Foundation of China (42172087, 41572063, U1906207), Croucher Foundation Visiting Scholarship for PRC Scholars, the Research Matching Grant (185228) from Lingnan University, Key Laboratory of Gold Mineralization Processes and Resource Utilization (Ministry of Land and Resources) and Shandong Key Laboratory of Metallogenic Geological Process and Resources Utilization (2013003), and Shandong Geological Exploration Project (Lukan Zi (2018) No. 19). The authors are grateful to the Shandong Institute of Geological Survey, and to Laiming Wang and Handong Liu for the guidance and fruitful discussion during the fieldwork.
© 2023 The Authors
- He-Ar isotopes
- Pb isotope
- C-O isotopes
- Fluid inclusion
- Liaoshang gold deposit
- NE China
- C–O isotopes
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- 1 Finished
Age and petrogenesis study of the Lantau Volcanic Group and Kwai Chung Suite: implications on Jurassic-Cretaceous boundary magmatism in South China (Visitor: MAO Guangzhou, Shandong University of Science and Technology)
16/08/21 → 15/02/22
Project: Grant Research