Ore-forming materials and fluids and ore-controlling factors of the Liaoshang gold deposit in Jiaodong Peninsula, NE China
Ore Geology Reviews(2023)
摘要
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 x 10-14 cm3STP/g, 4He = 1.21 - 3.24 x 10-7cm3STP/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 x 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 813C =-2.9 to-4.4 %o and 818OV-SMOW = 10.5 to 11.3 %o. 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..
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关键词
He-Ar isotopes,Pb isotope,C-O isotopes,Fluid inclusion,Liaoshang gold deposit,NE China
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