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.
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References
Montacer, M., Disnar, J. R., Orgeval, J. J. et al., Relationship between Zn-Pb and oil accumulation processes: Example of the Bou Grine deposit (Tunisia),Org. Geochem., 1988, 13: 423.
Peabody, C. E., Einaudi, M. T., Origin of petroleum and mercury in the Culver-baer Cinnabar deposit, Mayamas District,California. Econ Gal., 1992, 87: 1078.
Shi Jixi, Yu Xiaoyin, Wang Huayun, Applications of pale-oilfield and bitumen inclusion in metallic mineralization,Acta Mineralogica Sinica (in Chinese), 1995, 15(2): 117.
Marikos, M. A., Laudon, R. C., Leventhal, J. S., Solid insoluble bitumen in the Magmont West Orebody, Southeast Missouri,Econ. Geol., 1986, 81: 1983.
Fu Jiamo, Liu Dehan, Lu Jialan, Some aspects of organic geochemistry of strata-bound deposits, inAnnual Research Reports of the Organic Geochemistry Laboratory: 1988,Institute of Geochemistry, Chinese Academy of Sciences (in Chinese), Beijing: Science Press, 1988, 174–185.
Powell, T. G., Macqueen, R. W., Precipitation of sulfide ores and organic matter: Sulfate reductions at Pine Point, Canada,Science, 1984, 224: 63.
Kesler, S. E., Jones, H. D., Furman, F. C. et al., Role of crude oil in the genesis of Mississippi Valler-type deposits: Evidence from the Cincinnati arch,Geology, 1994, 22: 609.
Lu Jialan, Zhuang Hanping, Study on the role of organic matter in low-temperature mineralization of gold and silver,Geochemica (in Chinese), 1996, 25(2): 172.
Manning, D. A. C., GiZe, A. P., The role of organic matter in ore transport processes, inOrganic Geochemistry ((eds. Engel, M. H., Macko, S. A.), New York: Plenum Press, 1993, 547–561.
Li Youchuan, Zhang Aiyun, Organic geochemical features of gold deposit from Lower Triassic in southwest Guizhou Province and their mineralization significancc,Geochchernica (in Chinese), 1997, 26(4): 36.
Zhuang Hanping, Lu Jialan, Fu Jiamo, Preliminary study on light hydrocarbons in ore-forming fluíds of gold and animony depositios in southwest guizhou, China,Chinese Science Bulletin (in Chinese), 1997, 42(20): 1756.
Luo Xiaoheng, Geological characteristics, mineralizing mechanism and exploration of Lannigou gold deposit in Zhenfeng, Guizhou Province, China, inCarlin-type Gold Deposits in China (ed. Liu Dongsheng), Nanjing: Nanjing University Press, 1994, 100–115.
He Lixian, Zhen Yuelin, Lin Liqing,Geology of Gold Deposits in Guizhou Province, China (in Chinese), Beijing: Geological Press, 1993, 1–156.
Zou, D., Ren, C., Tang, J. et al., An integrated computer system for Fudan nuclear microprobe,Nucl. Instr. and Meth. in Phys. Res. B, 1995, 104: 119.
Hu Ruizhong, Shu Wenchao, Bi Xianwu, A possible evolution pathway of ore-forming hydrothermal fluids of micro-dissemintated gold deposits in triangle district of Yunan, Guizhou and Guangxi Province, China: Chronological evidence,Acta Mineralogica Sinicu (in Chinese), 1995, 15(2): 144.
Wu Haoruo, Kuang Guodun, Wang Zhongcheng, Reconsideration of later Paleozoic basic rock and its tectonic significances.Scientia Geologica Sinica (in Chinese), 1993, 28(3): 288.
Li Zhong, Liu Tiebing, Mineralivng conditions of Lannigou gold depasit in Guizhou, China: Study on petrological geochemistry,Mineral Deposits (in Chinese), 1995, 14(1): 51.
Rogers, M. A., McAlary, J. D., Bailey, Significance of reservoir bitumens to thermal-maturation studies, Western Canada Basin,AAPG Bulletin, 1974, 58: 1806.
Zeng Yishan, Jiang Shijun, Experimental study of the deposition mechanism of Au on pyrite surface,Scientia Geoloica Sinica (in Chinese), 1996, 31(1): 90.
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Project supported by the Climbing Project (No. PA30) and the National Natural Science Foundation of China (Grant No. 49673190).
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Zhuang, H., Lu, J., Fu, J. et al. Crude oil as carrier of gold: petrological and geochemical evidence from Lannigou gold deposit in southwestern Guizhou, China. Sci. China Ser. D-Earth Sci. 42, 216–224 (1999). https://doi.org/10.1007/BF02878521
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DOI: https://doi.org/10.1007/BF02878521