牦牛坪稀土矿床成矿作用浅析

Preliminary Analysis of the Maoniuping REE Mineralization

牦牛坪稀土矿受哈哈断裂带控制,呈带状分布,由大脉状、平行脉状、网脉状的稀土矿脉穿插贯通,与周围交互的碱长花岗岩、英碱正长岩、流纹岩、云煌岩等围岩构成地质体。霓石英碱正长岩是稀土成矿的物质基础和富集体,由它演化生成的碱性基性岩脉和方解石碳酸岩脉均为矿(化)脉,代表了先后两次热液成矿高潮;含霓石碱性花岗斑岩的生成,宣告了大规模稀土成矿作用结束。本文通过分析控矿地质因素、成矿物质来源、成矿温压、成矿时代,探讨其矿床成因,总结了成矿模式。。

The Maoniuping REE deposit is controlled by the Haha fracture zone and occurs as large vein,stockwork in alkali-feldspar granite,felsic alkali syenite,rhyolite and minette.Aegirine felsic alkali syenite is the material base of REE mineralization and host rock.Basic and calcite carbonate dikes derived from aegirine felsic alkali syenite represent two stages of geothermal mineralization.Aegirine granite emplacement means the end of large-scale REE mineralization.This paper has a discussion on ore genesis and metallogenic model of the Maoniuping REE deposit.