摘要
四川会理县大岩子铂钯矿床是目前国内品位最高的独立铂族元素矿床之一,也是一个独特的热液成因矿床。矿区及区域上的镁铁质岩浆岩可能是铂族元素的初始来源,震旦系白云岩是其有利的容矿围岩,构造控制下的热液活动促使了铂族元素的迁移富集。地表氧化带蓝铜矿化白云岩矿石的PGE含量最高可达27.13×10-6,坑道中相对新鲜橄辉岩的PGE含量为1.068×10-6,强烈蚀变橄辉岩含PGE0.528×10-6,地表蚀变后橄辉岩的PGE含量为0.435×10-6,表明铂族元素可能发生了活化转移。整个攀西地区基性超基性岩发育,后期构造活动强烈,有利的围岩广泛分布,因而具备形成热液型铂族元素矿床的条件,找矿前景看好。
The newly discovered Dayanzi Pt--Pd deposit in Sichuan Province is a unique hydrothermal deposit with the highest PGE grade of ores in China. The PGE in the Dayanzi deposit might come from the regionally distributed mafic--ultramafic rocks, mainly form those located in the Dayanzi mine. Dolomite in the Sinian strata is the favorite host rocks for PGE, while the structure-controlled movements of hydrothermal have contributed to the migration and enrichment of PGE. The dolomite-type ores with obvious azurite from the surface oxidized zone have the highest content of PGE up to 27. 13 g/t. Relatively fresh olivine pyroxenite samples from the 2040 m gallery have a PGE content of 1. 068 g/t, intensively altered olivine pyroxenite samples have a PGE content of 0. 528g/t, while altered olivine pyroxenite samples from surface have a lower PGE content of 0. 435g/t, suggesting that the platinum-group elements have been removed from the primary mafic--ultramafic rocks. Considering the widely distribution of mafic--ultramafic rocks in the Panxi area, later active tectonic movement and the common existence of favorable host rocks, especially Sinian and Cambrian dolomites, we take a good future for prospecting epigenetic PGE deposits and other types of PGE deposit in the areas affected by the Permian Emei mantle plume in southwestern China.
出处
《地质论评》
CAS
CSCD
北大核心
2006年第2期219-223,共5页
Geological Review
基金
国土资源部百名优秀青年科技人才计划资助项目
地质大调查项目(编号200310200002
200020190118-04)的成果。
关键词
铂族元素
热液成矿
大岩子
找矿前景
四川
platinum-group elements
hydrothermal mineralization
Dayanzi, Sichuan
Prospecting
