云南临沧煤型锗矿床中锗富集过程的有限元数值模拟

成矿元素富集作用是煤型关键金属矿床研究面临的主要问题之一。针对云南临沧煤型锗矿床中锗富集过程进行热-流-化-质多场耦合数值模拟研究。结果表明，数值模拟结果与前人研究结果吻合，验证了煤型锗矿床成矿理论及数值模拟方法在矿床学理论研究中的作用。岩体上表面形态是临沧锗矿床成矿的关键控制因素，具有穹隆形态的岩体上表面能够使含煤盆地底部产生9.1×10³倍的锗富集(相较于反应物浓度),在岩体规模减小50%的情况下仍有6.9×10³倍的富集，而凹陷和水平的岩体上表面分别只产生了589倍和9.3倍的锗富集。因此，具有穹隆形态的岩体上表面更有利于其上部的含煤盆地形成高品位的锗矿化，穹隆状岩体的上表面可为岩浆热液成因的煤型锗矿床深、边部找矿勘探提供有利信息。

Finite element method- based numerical simulation of the enrichment process of Ge within the Lincang coal- hosted Ge deposit, Yunnan, China

The enrichment process of ore- forming materials is a key problem facing ore geology researchin the coal- hosted critical metal deposits. Numerical simulation linking pressure, heat transfer, fluid- flow and chemical reaction processes is conducted to quantitatively describe the enrichment process of Ge within the Lincang coal- hosted Ge deposit, Yunnan, China. Modeling results are consistent with previous research, verifying the metallogeny of coal- hosted Ge deposits and the effectiveness of numerical modeling approach within ore geology research. The morphology of the upper surface of intrusions is a key factor controlling the enrichment process of ore- forming materials, and intrusions with dome upper surface results in 9.1×103 times of the concentration of Ge compared to the concentration of Ge participating in chemical reaction. With half the size of intrusion, the enrichment rate can still approach 6.9×103. However, intrusions with depressed and flat upper surfaces can only lead to Ge enrichment of 589 times and 9.3 times, respectively. Therefore, intrusions with dome upper surface can boost the generation of high- grade Ge mineralization within the coal basin, which can provide useful information for future deep prospecting and exploration of coal- hosted Ge deposits with magmatic- hydrothermal origins.