Re-Os Isotopic Dating and its Geological Implication of Gold Bearing Pyrite from the Baiyun Gold Deposit in Liaodong Rift
The Baiyun gold deposit is one of the most important large gold deposits in the Liaodong rift. However, no directly chronological dating result has been reported for it yet. On purpose of dating the mineralization of the deposit, rhenium and osmium isotopes in eight gold bearing pyrite separates from different types of ores in the deposit have been analyzed. The results yielded Re-Os isochronal age of 225.3±7.0 Ma (MSWD=5.8), with an initial187Os/188Os rate of 2.1±2.8. Combined with the previous researches, it is concluded that the Baiyun gold deposit is a magmatic hydrothermal deposit, which was formed in the Indo-Sinian period and the ore-forming materials were mainly originated from the crust. It is also suggested that the deposit was formed in the intracontinental post-collisional setting subsequent to the subduction of the Mongolia-Okhtsk seas. This study may shed light on the future exploration of similar ore deposit (relate to the Indo-Sinian magmatism) in the Liaodong rift.
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NSTL
万方数据
维普
