云南鹤庆锰矿控矿因素初步分析

ANALYSIS OF ORE CONTROLLING FACTORS OF HEQIN MANGANESE DEPOSIT

鹤庆锰矿产出于晚三叠世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 -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。稀土和碳、氧同位素资料表明 ,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。总结出区域性深大断裂、玄武岩浆活动、矿源层三者为扬子地块西缘卡尼

Heqin maganese deposit which was formed in an intensely decending platform trough environment during Norian of late Triassic, was 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 the migration of thermal solution into the basin. As result, the activity of basaltic magma, the regional deep faults and the source bed were considered to be the major factors controlling the manganese mineralization in the western margin of Yangtz platform during Carian Norian of late Triassic.