鹤庆锰矿小天井矿区微量元素特征与沉积成矿环境研究

Trace Element Characteristics and Sedimentary Environment of the Xiaotianjing Manganese Deposit in the Heqing Area, Yunnan Province

小天井矿区是鹤庆锰矿储量最大开采最早的矿区,通过对该矿区含锰岩系的60个样品进行微量及稀土元素测试,运用相关分析、因子分析等多元统计方法分析和探讨微量及稀土元素的地球化学特征与锰矿的沉积环境关系,确定Mo、U、V、Mn、Zn为该矿区重要成矿元素组合,这对本区地球化学找矿中判别地层与构造的含矿性、推断隐伏矿体寻找接替资源具有重要意义。对Co/Ni、Sr/Ba、Th/U的分析,认为锰矿层物源主要是陆源,推测沉积环境为陆缘近海环境,并对该区锰的沉积成矿环境进行了进一步探讨。

The Xiaotianjing manganese deposit possesses the largest reserves, and is the earliest exploited mine in the Heqing area, Yunnan Province. This study collected 60 samples from the manganese - hearing rock series to conduct trace element and REE analysis, and discussed their characteristics and relationship to sedimentary enviromnents. By using the muhivariate statistical cmTelation analysis and factor analysis, this work found that the ele- ments Mo, U, V, Mn and Zn constitute an important ore - fornfing element assemblage in the mining area. This is of great significance for discriminating ore potentialities nf the strata and structures and determining concealed orebodies. Analysis of the Co/Ni, Sr/Ba, and Th/U suggests that the manganese layer materials were derived from terrigenous sources, and the depositional environment was an offshore continental nmrgin.