云南鹤庆式锰矿成因研究

从沉积学、构造学和锰质来源三个方面研究了鹤庆锰矿．结果表明：鹤庆锰矿产出于晚三叠世卡尼克-一诺利期剧烈下陷的一个台沟环境．力学成因上，该台沟盆地属于走滑拉张型盆地．它的生成与西缘台褶带卡尼克一诺利中期区域性南北向深大断裂带的右行走滑拉张活动有直接的关系；成矿经由以玄武岩浆活动为代表的地热系统对盆地基底矿源层中锰质的萃取、生物吸收以热水喷流形式进入盆地的矿质而成矿的过程；区域性深大断裂、玄武岩浆活动、矿源层三的有效时空组合是形成扬子地块西缘卡尼克-诺利期优质富锰矿的控制因素．

Genesis of Heqin Manganese Deposit

Sedimentary, tectonics and manganese source was studied to determine the genesis of Heqin-type high grade manganese deposit. Heqin manganese depoit formed in an dissimilative trough environment superposed on successively descending platform during Camian-Norian of late Triassic, is closely related to the pull-apart basin induced by dextral strike slip of N-S trending deep fault zones in the western margin of Yangtz platform. The analysis of rare-earth elements and isotopes of C and O revealed that the mineralization experienced such processes as the extraction of manganese from the source bed in the basement by means of basaltic lava activity, the biological absorption of manganese and migration of thermal solution into the basin. As result, the effective space-time combination of activity of basaltic magma, the regional deep faults and the source bed are thought to bea significant controlling factor for the high-grade manganese deposit in western margin of Yangtz platform during Carin-Norian of late Triassic.