Advertisement

Nonrenewable Resources

, Volume 7, Issue 1, pp 45–51 | Cite as

Three-dimensional geological environment simulation of submarine exhalative sediments

  • Jin Youyu
  • Zhao Pengda
Article
  • 44 Downloads

Abstract

On the basis of the major metal grades from the super-large Bainiuchang Ag-rich polymetallic ore deposit, enrichment evolution processes were divided into three populations by using a new multiple time-series model. Population 1 shows the highest temporal/spatial autocorrelation with the ore-forming processes. Population 3 is considered to be a white noise process. The lithologies of populations 1 and 2 are closely related to submarine exhalative hydrothermal sedimentation. By using a semi-Markov process and a dynamic lithologic ratio parameter model, the paleogeographic environment of the bathyal basin in which the Bainiuchang Agrich polymetallic ore deposit formed was simulated. The result of the simulation suggests that four major submarine exhalation cycles occurred during basin evolution. Hydrothermal sedimentary metallization took place in the middle stage of each cycle. Hydrothermal sedimentation in each of the four cycles suggests an evolution from weak to strong to stronger to weak. Debris and turbidity currents related to syndepositional faulting along the northwestern margin of the basin and submarine hydrothermal exhalation originated from vents and flowed from northwest to southeast. A three-dimensional, finite-element method was used to simulate quantitatively the dynamic evolution of the temperature field of heat fluid circulation. A model is proposed that allows for the submarine heat fluid circulation from seawater that percolates downward, the upflow along a syndepositional falut to exhalation on the seafloor, and the formation of lenticular ore bodies in a single tectonic pulse. Comparison of the simulated temperature field and the mixing population of thermometric data of fluid inclusions suggests that the major submarine exhalation took about 35,000 years and that after 15,000 years from the initial establishment of the temperature field, the temperature of heat fluid circulation at the vents reached a maximum of 280°C.

Key words

Three-dimensional geological environments submarine exhalative sedimentation heat fluid circulation dynamic evolution ALCAR time series model semi-Markov process computer simulation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Jin, Y. Y., 1990, Application of semi-Markov process in analysis of the detailed deposition. Acta Sedimentologica Sinica, v. 8, n. 1, p. 133–142.Google Scholar
  2. Jin, Y. Y., 1991, The new method of stratigraphic columnar simulation and its application in synthetic columnar simulation of detailed depositional section. Earth Science Journal of China University of Geosciences, v. 16, n. 6, p. 697–704.Google Scholar
  3. Jin, Y. Y., 1995a, Dynamic evolution modeling for lithologic ratio parameters of hydrothermal sediments: Earth Science Journal of China University of Geosciences, v. 20, no. 2, p. 179–184.Google Scholar
  4. Jin, Y. Y., 1995b, The ALCAR model and decomposition of folding process: Signal Processing, v. 11, n. 2, p. 66–72.Google Scholar
  5. Jin, Y. Y., 1996, The ALCAR model and decomposition of overlapping process,in International Conference on Signal Processing, 3d, Beijing, October 14–18, 1996 Beijing, Institute of Electrical and Electronics Engineers and Publishing House of Electronics Industry, p. 40–43 (no. 1).Google Scholar
  6. Jin, Y. Y. and Meng, X. G., 1992, Quantitative analysis of time and space series in geology: Wuhan, China University of Geosciences Press, p. 46–91, 102–111.Google Scholar
  7. Russell, M. J., 1978, Downward excavating hydrothermal cells and Irish-type ore deposits: Importance of an underlying thick Caledonian prism: Institute of Mining and Metallurgy Transactions, v. 87, sec. B, p. 168–171.Google Scholar
  8. Russell, M. J., 1986, Extension and convection: A genetic model for the Irish Carboniferous base metal and barite deposits,in Andrew, C. J., Crowe, R. W. A., Finlay, S., Pennell, W. M., and Pyne, J. F., eds. Geology and genesis of mineral deposits of Ireland. Dublin, Irish Association of Economic Geologists, p. 545–554.Google Scholar
  9. Strens, M. R., Cann, D. L., and Cann, J. R., 1988. A thermal balance model of the formation of sedimentary exhalative lead-zinc deposits: Economic Geology, v. 82, n. 3, p. 1192–1203.Google Scholar

Copyright information

© International Association for Mathematical Geology 1998

Authors and Affiliations

  • Jin Youyu
    • 1
  • Zhao Pengda
    • 1
  1. 1.Faculty of Earth ResourcesChina University of GeosciencesWuhanChina

Personalised recommendations