Abstract
The Jiaodong super-large gold metallogenic region is located on the eastern margin of the North China craton and the western margin of the Circum-Pacific tectonic belt. Ore-forming chronology indicates that these deposits formed at 120 ± 10 Ma. Helium and argon isotope compositions of fluid inclusions in pyrite range in 3He/4He ratios from 0.38 to 2.36 R/Ra (R: 3He/4He ratios of samples; Ra: 3He/4He ratios of Beijing air, 1.4 x 10-6) and in 40Ar/36Ar ratios from 310 to 1148. δ18O and δD values of fluid inclusions in quartz are -2.16 to +6.28‰ and -65 to -98‰, respectively. A consistent relationship between H-O and He-Ar isotopic systems show that mantle-source fluids were involved in large-scale metallogeny in the Jiaodong region. The fluids were produced accompanying delamination, lithosphere thinning, and crust-mantle interaction that occurred in the eastern North China craton during the Early Cretaceous (140-120 Ma).
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