云南富宁良子老寨钛铁矿成矿规律和矿床成因

云南富宁地区钛铁矿是我国重要的钛铁矿矿床,成矿条件优越。本文对良子老寨矿区残坡积风化壳型钛铁砂矿床的地质特征、矿体、矿石特征进行了总结和研究,探讨了矿床的矿床成因和成矿规律。海西—印支期偏碱性基性钛辉辉长辉绿岩体为该区钛铁矿的形成提供了物质来源。富宁地区温热潮湿多雨气候有利于风化作用形成,岩体出露地表后,岩体中的钛矿物经风化剥离、水解作用、次生富集、原地残留或近距离搬运沉积,形成了残坡积风化壳型钛铁砂矿床。陡坡、临近河流区域矿体厚度薄,风化作用弱部位品位低;山脊缓坡、河谷阶地、地形低凹地段矿体厚度较大、品位高。本文研究成果能够指导滇东南地区残坡积物风化壳内钛矿的找矿工作。

Genesis and metallogenic regularity of ilmenite deposit in Funing Liangzi Laozhai, Yunnan Province

Ilmenite in Funing area, Yunnan Province is an important ilmenite deposit in China, which possesses advantageous metallogenic conditions. This paper summarizes the geological characteristics, orebody and ore characteristics of the Liangzi Laozhai deposit, and discusses genesis and metallogenic regularity. The Hercynian-Indosinian alkaline-basic titanium gabbro-diabase plutons provide material sources for ilmenite deposits in this area. The warm, humid and rainy climate in Funing is conducive to the further advancement of weathering. After the pluton is exposed to the surface, the titanium minerals in the plutons have been weathered o., hydrolyzed, secondary enrichment, in situ residual or close migrated and deposited, form the weathering crust of residual slope sediments ilmenite deposit. The orebody thickness is thin in the steep slope and the river, and the grade is low in the weak weathering part. The orebody thickness is larger and the grade is higher in gentle slope of ridge, valley terrace and low concave terrain. This study can help the future exploration of the weathering crust of residual slope sediments ilmenite deposit in southeastern Yunnan.