Re-Os dating of gold-bearing arsenopyrite of the Maoling gold deposit,Liaoning Province,Northeast China and its geological significance |
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Authors: | Gang?Yu Gang?Yang Email author" target="_blank">Jiangfeng?ChenEmail author Wenjun?Qu Andao?Du Wei?He |
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Institution: | (1) Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, China;(2) National Research Center of Geoanalysis, Chinese Academy of Geological Sciences, 100037 Beijing, China;(3) 5th Geological Survey Party, 115100 Liaoning Province, Dashiqiao, China |
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Abstract: | The Maoling gold deposit, one of the large gold deposits in eastern Liaoning Province, NE China, is an arsenopyrite-disseminated
gold deposit with a resource of approximately 25 t Au and an average Au grade of 3.2 g/t. Six arsenopyrites closely related
to Au mineralization of the Maoling gold deposit are dated by Re-Os technique and define a Re-Os isochron with an age of 2316±
40 Ma, which suggests that the deposit was formed in the Paleoproterozoic era rather than in the Indosinian period as some
early researchers suggested. High initial 187Os/188Os ratio of 1.32±0.48 indicates a crustal derivation of the ore-forming material of the deposit, which may be derived from
rocks of the Gaixian formation of the Liaohe Group. Furthermore, the result also implies that the age of the Gaixian Formation
in the Maoling district is older than 2316±40 Ma. |
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Keywords: | Re-Os dating arsenopyrite Maoling gold deposit age of mineralization east of Liaoning Province |
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