内蒙古鄂伦春西林梯铅锌钼矿床地质特征及矿床成因

研究区位于大兴安岭晚古生代、中生代CuPbZnAuAg多金属成矿带北段,中—晚华力西期韧性推覆构造贯穿全区。矿区圈定出1条含钼铅锌银矿化蚀变带,27条钼矿体、6条铅锌矿体,斑岩体控制了矿化蚀变带的空间分布、形态及产状。早白垩世花岗斑岩在空间上、成因上与矿化活动关系密切,是成矿最主要的热源、矿源。矿体产出于斑岩体顶部,向深部矿化蚀变均有变厚和增强趋势。铅锌钼矿体脉群底部具有形成厚大斑岩型钼矿体的最佳地质条件。初步认为矿床类型属热液脉型钼多金属矿床。矿区经历多期次构造—岩浆活动,特别是燕山晚期岩浆侵入与火山喷发活动异常强烈,成矿条件优越。

Geological characteristics and genesis of Xilinti lead-zinc- molybdenum deposit in Oroqen, Inner Mongolia

The study area is located in the northern part of Late Paleozoic and Mesozoic Cu-Pb-Zn-Au-Ag polymetallic metallogenic belt in the Great Xingan Mountains area, and the Middle to Late Variscan ductile nappe structure runs through the whole area.The porphyry controls the spatial distribution, morphology and occurrence of the mineralized alteration zone with 1 molybdenum-bearing, lead-zinc-silver mineralized alteration zone, 27 molybdenum ore bodies and 6 lead-zinc-silver ore bodies.The Early Cretaceous granite porphyry is closely related to mineralization activities in space and genesis, and is the main heat source and ore source for mineralization.The orebody occurs at the top of the porphyry, and the deep mineralization and alteration tend to be thickened and strengthened.The bottom of the vein group has the best geological conditions for forming thick and large porphyry molybdenum ore bodies.It is preliminarily considered that the deposit belongs to hydrothermal vein type molybdenum polymetallic deposit.The mining area has experienced multiple periods of tectonic-magmatic evolution history, especially the magmatic intrusion and volcanic eruption in the late Yanshanian period, and the ore-forming conditions are superior.