摘要
四川丹巴杨柳坪矿床是峨眉大火成岩省典型铜镍硫化物矿床,此类矿床中蕴藏了丰富的铂族资源。岩矿石光片的扫描电镜与电子探针分析表明,四川丹巴杨柳坪铜镍硫化物矿床中Pt、Pd以独立矿物为主,少量铱族矿物具有成因指示意义,极少量Pt、Pd元素呈类质同象形式赋存于磁黄铁矿、黄铜矿中。Pt主要以独立矿物砷铂矿的形式存在,矿物粒径1~60μm,呈半自形-自形,主要被磁黄铁矿包裹,部分穿切磁黄铁矿、黄铜矿,少量被橄榄石与菱镁矿包裹。Pd以碲锑钯矿的形式存在,矿物自形程度较差,大量赋存于黄铜矿、磁黄铁矿等金属硫化物的裂隙,部分被黄铜矿包裹,少量形成于热液阶段的碲锑钯矿与辉砷钴矿紧密共生充填于裂隙中。铱族矿物呈半自形-自形与高温热液矿物辉砷钴矿紧密共生。
The Yangliuping Cu-Ni sulfide deposit in the Danba area, Sichuan province is a typical Cu-Ni sulfide deposit in the Emeishan Large igneous province. This deposit contains abundant PGE resources. Scanning electron microscopy(SEM) and electron probe analyses of rocks and ores show that Pt and Pd occurred mainly as independent Pt and Pd minerals and occurred limitedly as isomorphic state in pyrrhotite and chalcopyrite in the Yangliuping Cu-Ni sulfide deposit A small amount of iridium minerals have genetic significance. Sperrylite is the main independent Pt mineral in form of semi-euhedral or euhedral crystals, with its particle sizes of 1-60 μm. It occurred as inclusions mainly included in pyrrhotite and limitedly included in olivine and magnesite, or as minor veinlets cut through pyrrhotite and chalcopyrite.The Pd occurred mainly as poorly crystallized testibiopalladite grains in cracks and fissures of chalcopyrite, pyrrhotite and other metal sulfides, and partly as testibiopalladite inclusions in chalcopyrite. A small amount of hydrothermal testibiopalladite was closely intergrown with cobaltite filling in cracks. The semi-euhedral and euhedral iridium group minerals are closely intergrown with the relatively high temperature hydrothermal cobaltite.
作者
王坤阳
徐金沙
WANG Kun-yang;XU Jin-sha(Chengdu Center of China Geological Survey,Chengdu 610081,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2023年第1期18-24,共7页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(批准号:42102142)
关键词
丹巴
铂族
赋存状态
砷铂矿
碲锑钯矿
Danba
Platinum group
occurrence state
sperrylite
testibiopalladite
作者简介
第一作者:王坤阳,男,1985年生,高级工程师,硕士,从事微区矿物研究.E-mail:Wnagkunyang_1213@163.com
