Crude oil as carrier of gold: petrological and geochemical evidence from Lannigou gold deposit in southwestern Guizhou, China |
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Authors: | Hanping Zhuang Jialan Lu Jiamo Fu Chigang Ren Degang Zou |
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Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) Department of Physics, Fudan University, 200433 Shanghai, China |
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Abstract: | Organic matter is related closely to mineralization of Lannigou gold deposit in southwestern Guizhou, China. Regionally, the
distribution of organic carbon agrees well with that of faults within which gold deposits are hosted. Studies on organic petrology
show that pyrobitumen, which is related most closely to mineralization, adheres to quartz vein or fills quartz veinlet. Proton-induced
X-ray emission (PIXE) analysis shows an evident abundance of Au in pyrobitumen. Pyrobitumen paragenetically associates with
pyrite and arsenopyrite which are the main carrier minerals of Au. The thermal simulation experiment indicates that about
99% of Au will be concentrated in oil phase in the coexisting system of oil and brine and rock. The role of crude oil in ore-forming
process is: as carrier of Au, crude oil moves upwards, and undergoes thermal decomposition and thermochemical reduction when
it encounters the oxidizing fluid within the Trassic turbidity; Au is thus released from crude oil, reduced and precipitated.
Project supported by the Climbing Project (No. PA30) and the National Natural Science Foundation of China (Grant No. 49673190). |
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Keywords: | crude oil Lannigou gold deposit carrier |
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