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内蒙古孟恩陶勒盖矿床产于由黑云母斜长花岗岩和白云母斜长花岗岩组成的海西期孟恩花岗岩基的中心部位。矿体受东西向断裂控制,呈脉状。矿床主要有用组分为Pb、Zn、Cu、Ag,含Sn富In、Ga、Cd等分散元素,为一典型的多元素共生的多金属矿床。矿石铅同位素组成与赋矿的海西期花岗岩和矿区外围燕山期花岗岩的长石及全岩铅同位素组成明显不同,显示出矿石铅既不是由这两期岩浆活动提供的,也不是来自这两期花岗岩的改造。矿石铅与不同期次岩浆岩铅的对比显示,矿石铅来源于地幔岩浆分异,矿区深部可能存在地幔来源的岩浆岩。
The Meng-En-Tolgoi deposit in Inner Mongolia is produced in the central part of the Hercynian Mengnian granite base consisting of biotite plagiogranite and muscovite plagiogranite. Ore body by the east-west fracture control, was veins. The main useful components of the deposit are Pb, Zn, Cu, Ag and Sn-rich elements such as In, Ga and Cd. It is a typical multi-element symbiotic polymetallic deposit. The lead isotopic composition of the ore is significantly different from that of the Hercynian granite and the Yanshanian granite in the ore-hosting area, indicating that the ore lead is neither provided by nor is derived from these two phases of magmatic activity Reconstruction of period granite. The correlation between ore lead and different stages of magmatic lead shows that ore lead comes from mantle magmatic differentiation and that mantle-derived magmatic rocks may exist in the deep of the ore district.