Numerical Modeling of Coupling Metallogenic Dynamics of Fluid Flow and Thermal Transportation in Jiaodong Gold Ore Cluster Area, China
Based on geological research, applying the method of combination of theoretic analysis and numerical modeling, comprehensive considering fluid flow and thermal transportation, using transitional boundary physical model of flow-transportation, we have simulated a copuling metallogenic dynamical process in Jiaodong gold ore cluster area, China. The results revealed that the temporal-spatial changing regularities of the temperature Field and the velocity field of fluids in this region. After the emplacement of magmas, the intruded magmas gradually lost its heat supply from deep much bigger magma chamber and exchanged heat with wall rocks. So there formed temperature changing belts with the rock body as its center. It changed rapidly in the center and became gentle outside. The belts formed a convex heat field. It is one of main drive force for fluid mineralization and a basic factor to transportation of ore-forming materials. Alteration, developed in fault zones, was resulted from the migration of hydrothermal fluids along temperature-decreasing direction under almost balanced conditions. Isothermal lines of faults are nearly perpendicular to surfaces, and vectors of temperature gradient are nearly horizontal. Vectors of temperature gradient in contact zone of rock bodies (interface) are still nearly horizontal, besides a little upward. Fast flow of ore-forming fluid favors the occurrence of mixed fluid. Faults are the places where there was strong flow-transportation coupling mineralization. Metallogenic materials precipitated from upward fluid because temperature decreased gradually upward. Faults are major pathways for migration of large amount of hydrothermal solutions. Fluids flow from the Linglong-type granites to sericitoliles. When the fluids reached faults, they returned to rock bodies. When they reached the contact zone of rock bodies, they returned again. Such special circulation model caused migration of gold-bearing sulfides with fluids flow. Then gold-bearing sulfides deposited at the interfaces and solution-reaction frontiers occurred. The frontiers enlarged with circulation of fluids and ore beds became thicker and thicker.
Liqiang Yang Jun Deng Qingfei Wang Bangfei Gao Li Wang ChunYing Guo
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,
国际会议
The 12th Conference of the International Association for Mathematical Geology(第12届国际数学地质大会)
北京
英文
39-43
2007-08-26（万方平台首次上网日期，不代表论文的发表时间）