河南栾川杨树凹-百炉沟MVT铅锌矿带地质特征

河南栾川地区马圈-百炉沟铅锌矿带位于华北陆块南缘中-新元古代被动大陆边缘中的浅海台地相碳酸盐岩环境，矿化以铅锌(银)为主，矿床赋存于官道口群中的三个古含水层系统(基本上是由下部含(透)水的碎屑岩(砂岩)与上覆相对不透水的碳酸盐岩组成)中，矿体形态比较简单，富矿段多赋存于多组构造交汇部位，硅化、角砾岩化、白云岩化、滑石化是矿区最主要的围岩蚀变。矿床地质特征可与北美Missouri地区的MVT矿床对比，成因属密西西比河谷型(MVT)。研究表明，位于龙家园组、冯家湾组中的含水层是最重要的找矿层位，角砾岩化、白云岩化、滑石化等是主要的找矿标志，沿马圈～竹园沟一百炉沟推覆断层北侧(官道口群)地区是寻找MVT型铅锌银矿床最主要的远景区。

Geological Features of Yangshuwa- Bailugou MVT Lead- zinc Deposit Belt in Luanchuan, Henan Province

Maquan Bailugou lead zinc deposit belt of Henan Luanchuan locates in neritic platform carbonate rock environment of Meso Neoproterozoic passive continental margin in south margin of North China Continental Block, mineralized mainly in lead zinc(silver). The ore deposit develops in two deposit constraining palaeo aquifers of the Guandaokou Group Longjiayuan Formation and Fengjiawan formation. The deposit body's form is simple medium. Most of mineral rich segments develop in the joints of the several structures. Silicification, brecciation, dolomitization, talcization are predominant ore structures and host rock alterations. The deposit genesis belongs to Mississippi Valley Type (MVT). Its geological features can be compared with Missouri MVT deposit in North America. The research on the ore deposit illustrates that aquifers in the Longjiayuan Formation and Fengjiawan Formation are the most important ore prospecting strata. Brecciation, dolomitizayion, talcization are main ore prospecting indicators. Area along north side of thrust fault (Guandaokou Group) in Maquan zhuyuangou bailugou is the most important prospecting area for MVT lead zinc silver ore deposits.