期刊
ORE GEOLOGY REVIEWS
卷 109, 期 -, 页码 130-143出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.oregeorev.2019.04.013
关键词
Zircon U-Pb dating; Sericite Ar-Ar dating; Isotope geochemistry; Wulong gold deposit; North China Craton
资金
- National Key RD Plan of China [2017YFC0601403]
- National Natural Science Foundation of China [41672066]
- Basal Research Fund of the CAGS [YYWF201512]
- Exploration Project for Old Mines of the Ministry of Land Resources (PRC) [1212011220675]
- State Scholarship Fund of China
The Wulong deposit is the largest quartz vein-type gold deposit in the eastern Liaoning Province of China. The gold ore bodies are hosted by Mesozoic biotite-granites. The mineralization occurs as veins with lenticular shapes. Laser-ablation-ICP-MS zircon U-Pb dating was used to date the biotite-granite, granite porphyry, and fine-grained diorites at the Wulong deposit, yielding ages of 155.4 +/- 0.9 Ma, 154.2 +/- 1.2 Ma, and 1211 +/- 0.9 Ma, respectively. A sericite sample from the gold ore yields a Ar-40-Ar-38 plateau age of 122.8 +/- 0.8 Ma (MSWD = 0.09). The calculated delta O-18(w) values for the quartz range from 4.8% to 8.6% and the 8Dw values of fluid inclusion waters in quartz vary from -98% to -77%. The H-O isotope data indicates that ore-forming fluids could be of a magmatic origin. The delta S-84 values of metallic sulfides range from +1.1% to +2.4%, with an average of +1.8%, suggesting that the sulfur is derived from a magmatic source. The He-3/He-4 ratios of fluid inclusions in pyrite range from 0.36 to 0.65 Ra with an average of 0.50 Ra. The mantle helium involved in the ore-forming fluid ranges from 3.9% to 7.2%, indicating a crustal fluid source. The Wulong gold deposit was formed at ca. 120 Ma and it has a genetic association with contemporaneous fine-grained diorite. The Wulong deposit was formed during lithospheric thinning of the eastern North China Craton during the early Cretaceous.
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