Advertisement

Geological and geochemical characteristics of the cherts in the Mojiang gold deposit and their implications

  • Xie Guiqing 
  • Hu Ruizhong 
  • Fang weixuan 
  • Qi Liang 
Article

Abstract

Geological and geochemical characteristics of cherts of the low-middle parts of the Jinchang Formation indicate that cherts are associated with hydrothermal sedimentation, but the middle-upper parts of the Jinchang Formation are mixed with normal sediments. The cherts are characterized by high Fe, As, Sb, Bi and Ga, low Al and total REE, negative Ce anomaly and HREE enrichment. Their δ18O values show that the forming temperatures of the cherts range from 128°C to 146°C.

Key words

chert hydrothermal sedimentation geochemistry Mojiang gold deposit 

References

  1. Adachi, M., K. Yamamoto, and R. Suigiski, 1986, Hydrothermal chert and associated siliceous rocks from the northern Pacific: their geological significance as indication of ocean ridge activity: Sedimentary Geology, v. 47, p. 125–148.CrossRefGoogle Scholar
  2. Bi Xianwu, Hu Ruizhong, and He Mingyou, 1995, ESR ages and their geological implications in Ailaoshan gold mineralization belt: Chinese Science Bulletin, v. 41, p. 1303–1303 (in Chinese).Google Scholar
  3. Bi Xianwu, Hu Ruizhong, and He Mingyou, 1997, Characteristics of ore-forming fluid of three gold deposits in Ailaoshan gold mineralization belt: Acta Mineralogica Sinica, v. 17, p. 435–441 (in Chinese with English abstract).Google Scholar
  4. Bostorm, K., 1983, Genesis of ferromanganese deposits-diagnostic criteria for recent and old deposits, in P. A. Rona et al, eds., Hydrothermal processes at seafloor spreading centers: New York, Plenum Press, 473 p.Google Scholar
  5. Bostorm, K., T. Kramember, and S. Gantner, 1973, Provenace and accumulation rates of opaline silica, Al, Fe, Ti, Mn, Ni and Co in Pacific pelagic sediment: Chemical Geology, v. 11, p. 123–148.CrossRefGoogle Scholar
  6. Crerar, D.A., J. Namson, M.S. Chyi et al., 1982, Manganiferous chert of the Franciscan assemblage: general geology ancient and modern analogues and implications for hydrothermal convection at oceanic spreading centers: Economic Geology, v. 77, p. 519–540.CrossRefGoogle Scholar
  7. Ding Ling and Zhong Dalai, 1995, Rare-earth element and Ce anomaly characteristics of siliceous rocks of paleoTethyan ocean from Changning-Menglian belt, in western Yannan Province: Science in China (Series B), v. 25, p. 93–100 (in Chinese).Google Scholar
  8. Ding Zhenju and Liu Congqiang, 2000, Rare-earth element geochemistry evidence of Fe-rich siliceous rocks from paleothermal water solution of Bikou Group: Nature Science Progress, v. 10, p. 427–433 (in Chinese).Google Scholar
  9. Fang Weixuan, Hu Ruizhong, and Xie Guiqing et al., 2001, Research and analysis on ore-con trolling factors for Mojiang-Yuanjiang nickel-gold deposits in Yunnan, China: Acta Mineralogica Sinica(in press).Google Scholar
  10. Fleet, A.J., 1983, Hydrothermal and hydrogenous ferromanganese deposits, in P.A. Rona et al., eds., Hydrothermal processes at seafloor speeding centers: New York, Plenum Press, 537p.Google Scholar
  11. Hendersm, P., 1984, Rare-earth element geochemistry: Amsterdam, Elsevier Science Publishes, 195p.Google Scholar
  12. Knauth, L.P. and S. Epstein, 1976, Hydrogen and oxygen isotope ratios in nodular and beded cherts: Geochim. et Cosmochim. Acta, 40, n. 9, p. 1095–1108.CrossRefGoogle Scholar
  13. Liu Jiajun and Zheng Minghua, 1993, Geochemistry of hydrothermal sedimentary silicalite: Acta Geologica Sichuan, v. 31, p. 110–118 (in Chinese with English abstract).Google Scholar
  14. Liu Jiajun, Zheng Minghua, Liu Jiaming et al., 1999, The geological and geochemical characteristics of Cambrian chert and their sedimentary environmental implications in western Qinling: Acta Petrologica Sinica, v. 15, p. 145–154 (in Chinese with English abstract).Google Scholar
  15. Liu Wenlong, Chen Jinrong, and Chen Guangyuan, 1999, Geology of Jinchang ultrabasic rock gold deposit in Mojiang, Yunnan Province: Beijing, Seismic Press, p. 1–127 (in Chinese with English abstract).Google Scholar
  16. Liu Yingjun, Cao Liming, Li Zhaolin et al., 1984, Geochemistry of element: Beijing, Science Press, 276p. (in Chinese)Google Scholar
  17. Marching, V., H. Gundlach, P. Moller et al., 1982, Some geochemical indicators of discrimination between diagenetic and hydrothermal metalliferous sediments: Marine Geology, v. 50, p. 241–256.CrossRefGoogle Scholar
  18. Rona, P.A., 1978, Criteria for recognition of hydrothermal mineral deposits in ocean crust: Economic Geology, v. 73, p. 135–160.CrossRefGoogle Scholar
  19. Wen Hanjie, 1999, Mineralogy, geochemistry and mineralization mechanism of selenium—taking Laerma seleniumgold deposit and some selenium-bearing formation as example: Doctor degree thesis of Institute of Geochemistry, Chinese Academy of Science, Guiyang, p. 31–32 (in Chinese with English abstract).Google Scholar
  20. Xia Bangdong, Zhong Lirong, Fang Zhong et al., 1995, The origin of cherts of the Early Permian Gufeng Formation in the Lower Yangtze area, eastern China: Acta Geologica Sinica, v. 69, p. 125–137 (in Chinese with English abstract).Google Scholar
  21. Xu Yuetong, 1996, The geochemical characteristics of hydrothermal sediment chert of the Late Proterozoic and their sediment environmental implication in Xiqiu area, Zhejiang Province: Geochimica, v. 25, p. 600–606 (in Chinese with English abstract).Google Scholar
  22. Yamamoto, K., 1987, Geochemical characteristics and deposition environment of cherts and associated rocks in the Franciscan and Shimanto terranes: Sedimentary Geology, v. 52, p. 65–108.CrossRefGoogle Scholar
  23. Ying Hanlong, Cai Xinping, and Liu Bingguang, 1999, The geochemical characteristics and genesis of auriferous cherts in Mojiang gold deposit, Yunnan Province: Geochimica, v. 28, p. 307–317 (in Chinese with English abstract).Google Scholar
  24. Zhou Yongzhang, 1990, On sedimentary geochemistry of siliceous rocks originated from thermal water in Nandan-Hechi Basin: Acta Sedimentologica Sinica, v. 8, p. 75–83 (in Chinese with English abstract).Google Scholar

Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 2001

Authors and Affiliations

  • Xie Guiqing 
    • 1
  • Hu Ruizhong 
    • 1
  • Fang weixuan 
    • 1
  • Qi Liang 
    • 1
  1. 1.Open Laboratory of Ore Deposit Geochemistry, Institute of GeochemistryChinese Academy of SciencesGuiyangChina

Personalised recommendations