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矿床是地质过程的产物之一,深入分析控制矿床形成和保存的关键地质过程是矿产资源定量预测与评价的基础.闽西南马坑式铁多金属矿为矽卡岩型矿床,燕山期的岩浆活动提供了热源、流体来源及部分的铁质来源;热液沿着北东向断裂向上运移,在岩体与石炭-二叠纪碳酸盐岩地层的接触面及石炭-二叠纪地层内部发生了热液交代作用,形成了矽卡岩化;铁主要来源于石炭-二叠纪碳酸盐岩建造,后期燕山期岩浆的侵入,使得铁进一步富集;并在石炭-二叠纪地层中沉淀成矿.基于上述关键成矿过程,从“源”(热源、物质来源和流体来源)、“运”(流体通道)、“盖”(圈闭)、“储”(矿质沉淀场所)和“存”(矿床的后期保存条件)等方面提取了地质证据,利用模糊逻辑综合地质证据得到了找矿有利度图.结果显示所圈定的预测远景区与已知铁多金属矿床在空间上具有很强的相关性,可作为进一步工作部署的依据.基于地质过程的矿产资源定量预测与评价方法,决定矿床能否形成的关键地质过程为评价依据,可为闽西南进一步找寻马坑式铁多金属矿提供新的找矿思路和参考依据.
The deposit is one of the products of the geological process, and in-depth analysis of the key geological processes controlling the formation and preservation of mineral deposits is the basis for the quantitative prediction and evaluation of mineral resources. The MaKeng iron-polymetallic deposit in Southwest Fujian is a skarn-type deposit and the Yanshanian magma The activity provided sources of heat, fluid and part of the source of iron. Hydrothermal fluids migrated upward along the NE-trending faults. At the interface between the rock mass and the Carboniferous-Permian carbonate formation and the Carboniferous-Permian strata Hydrothermal metasomatism took place in the interior and skarnization was formed. Iron mainly came from the Carboniferous-Permian carbonate rock formation. In the late Yanshanian magma intrusion, the iron further enriched. In the Carboniferous-Permian In the stratigraphic sedimentary mineralization, based on the above key metallogenic processes, from “source” (heat source, material source and fluid source), “transport” (fluid channel), “lid” Geological evidence was extracted from the aspects of “storage” (mineral deposits) and “depositing” (post-preservation conditions of the deposit), and the prospecting benefit degree map was obtained by using the fuzzy logic comprehensive geological evidence.The results showed that the forecast prospective The area has a strong spatial correlation with the known iron polymetallic deposits As the basis for further work deployment.The quantitative prediction and evaluation method of mineral resources based on geological process and the key geological process for determining whether the deposit can be formed are the basis for evaluation and may provide a new prospecting prospect for MaKeng type iron-polymetallic ore in southwestern Fujian Ideas and reference basis.