“九龙脑成矿模式”及其深部找矿示范:“五层楼+地下室”勘查模型的拓展

“Jiulongnao metallogenic model” and the demonstration of deep prospecting:the extended application of “Five levels+Basement” exploration model

深部成矿预测已成为当前矿床学研究的科学前沿和研究重点。"五层楼"作为我国最具特色的深部找矿模型,源于华南钨矿勘查实践,在地质找矿中不断丰富并成功拓展应用。近年,项目组在南岭地区开展了深部探测、科学钻探和九龙脑矿田深部找矿示范,取得了一系列重要的找矿新突破,即在"五层楼"深部验证了"地下室",在外带破碎带发现了新类型矿体,在银金矿深部发现了钨铋,在岩体内带发现了多位一体成矿等,验证了南岭钨多金属矿集区的"第二找矿空间"。本文据九龙脑矿田深部找矿示范和南岭科学钻探成果,建立了南岭花岗岩相关钨多金属矿集区的"九龙脑成矿模式";定义了以往有争议的"地下室"矿化类型,强调了破碎带找矿方向的重要性,认为一定体量的花岗质岩浆在分异—含矿热液分离—迁移—富集过程中矿物质保持物质和能量守恒,而岩性、构造和力学性质的差异导致含矿热液在不同空间配置以不同的矿物组合形式堆积;按成矿系列理论之"全位成矿与缺位找矿"思路,在九龙脑矿田外围开展深部找矿示范,指明了各类型矿化的找矿方向,提出了预测各类矿体的技术方法组合。

Deep exploration has become a scientific frontier and focal point in the study of mineral deposit. ＂Five levels＂ as the most distinctive deep exploration model in our country, established from the south China tungsten ore prospecting practice, has been constantly enriched in the geological prospecting, and its application has been expanded successfully. Recent years, a series of new discoveries and new progress has been made by carrying out the deep exploration, scientific drilling and the deep prospecting in Jiulongnao orefield. We have verified the ＂Basement＂ in the deep of the ＂Five levels＂, a new type ore body in the fracture zone outside, tungsten and bismuth in the deep of silver-gold deposit and many kinds of mineralization within the rock mass have been discovered, which provides important information for deep exploration model research in tungsten ore concentration area. Meanwhile, a new challenge for metallogenic model research has been proposed. In this paper, by summarizing the latest achievements in Nanling region deep detection, we established the ＂Jiulongniao metallogenic model＂ for the Nanling tungsten polymetallic ore concentration area related to granite, which is based on the ＂Five levels＋ Basement＂ model. The ore-controlling factors and relationship of ore bodies in different zone were analyzed based on ＂the theory of metallogenic series＂. We believe that, for certain amount of granitic magma, its mineral substance keeps the mass and energy conservation in the processes of granitic magma differentiation, ore-bearing hydrotherm separation, migration and concentration. Differences in lithology, structure and mechanical properties have resulted in ore-bearing hydrotherm accumulated in different forms and in different space configuration. According to the theory of metallogenic series, we have demonstrated the deep prospecting surrounding the Jiulongnao ore concentration area, pointed out the prospecting direction of each type of mineralization, and put forward the optimization method for each kind of ore body.