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马关都龙锡多金属矿床是我国重要的锡石-硫化物矿床之一,其外围的地质找矿勘查对矿山的可持续发展具有重要意义。最近,在都龙矿床辣子寨矿段外围的勘查过程中发现碳酸盐型铅锌矿体,这是该矿区内发现的一种新矿化工业类型。新发现的铅锌矿体呈顺层网脉状、透镜状产于中寒武田蓬组第二段上部大理岩中,具有明显的层位和构造控制特征,但与都龙矽卡岩型Sn-Zn主矿体在矿物组合、围岩蚀变等方面存在明显差异,这种差异可能是它们距离岩体远近不同所致。尽管碳酸盐岩型铅锌矿体规模相对矽卡岩型主矿体较小,但其品位较高,且隐伏花岗岩体突起上方是其成矿有利地段,在今后矿区外围的找矿勘查中值得重视。研究认为碳酸盐岩型铅锌矿体与矽卡岩型主矿体的形成均与燕山晚期花岗岩的侵入活动有关。此外,新类型矿体的发现,不仅拓宽了矿山找矿空间与类型,对于外围找矿具有积极意义,而且为深化对都龙矿床成矿机理的认识提供了新的地质证据。
Maguan Dulongxi polymetallic deposit is one of the most important cassiterite-sulfide deposits in China. The geological prospecting and prospecting in the periphery is of great significance to the sustainable development of the mine. Recently, carbonate-type lead-zinc ore bodies were discovered during the exploration outside the Spicy Zizhai orefield in the Dulong deposit, a new type of mineralization found within the mining area. The newly discovered lead-zinc ore body is in the form of vein network, and the lens is produced in the upper part of the second member of Tudetang Formation in middle Cambrian, and has obvious stratigraphic and structural control characteristics. However, -Zn main orebody has obvious differences in mineral assemblage and wall rock alteration, etc. The difference may be due to their different distances from the rock mass. Although carbonate-type lead-zinc ore bodies are relatively small in size relative to skarn-type host ore bodies, the grade of carbonate-type lead-zinc ore bodies is relatively high and the ore-forming favorable sections above concealed granite bodies are raised. In prospecting surveys outside the ore district in the future Worth attention. It is concluded that the formation of carbonate-hosted lead-zinc ore bodies and skarn-type host ore bodies are related to the intrusive activity of late Yanshanian granites. In addition, the discovery of new types of ore bodies not only broadens the space and type of ore prospecting, but also has positive significance for peripheral ore prospecting. It also provides new geological evidences for deepening the understanding of the ore-forming mechanism of the Dullong deposit.