云南临沧煤型锗矿床中锗富集过程的有限元数值模拟  

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

作　　者：胡训宇 段飘飘[1,2] 杨永国[1,2] 陈玉华[1,2] 罗金辉[1,2] 杨慧[1,2] 王坤[1,2] 刘光贤 李跃 HU Xunyu;DUAN Piaopiao;YANG Yongguo;CHEN Yuhua;LUO Jinhui;YANG Hui;WANG Kun;LIU Guangxian;LI Yue(Key Laboratory of Coalbed Methane Resources&Reservoir Formation on Process,Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009,China)

机构地区：[1]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221008 [2]中国矿业大学资源与地球科学学院,江苏徐州221116 [3]东华理工大学地球科学学院,江西南昌330013 [4]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《地质学报》2023年第12期4150-4163,共14页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号42202327,41872248,42102099,41820104007)资助的成果。

摘　　要：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9.1×10^(3)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6.9×10^(3)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。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 9.1×10^(3) 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 6.9×10^(3).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.

关 键 词：临沧 煤型锗矿床 富集过程 数值模拟 多场耦合 

分 类 号：P612[天文地球—矿床学]