丹巴杨柳坪铜镍铂矿床中铂族元素赋存状态

Occurrence of PGE in the Yangliuping Cu-Ni-Pt Deposit in Danba

丹巴杨柳坪铜镍铂族矿床成矿期与国内最大的独立铂族金宝山矿床同属海西期。矿床中Pt、Pd较为富集,其次为Ir、Rh、Os、Ru;Pt含量0.05g/t^4.01g/t。矿床中以独立矿物存在的铂族矿物主要有砷铂矿、碲锑钯矿、锑钯矿等,粒度较小,在0.2μm^100μm间,在矿石中零星分布。独立铂族矿物的载体主要是磁黄铁矿、镍磁黄铁矿、黄铁矿、黄铜矿等金属矿物及碳酸盐、硅酸盐矿物。其次,铂族元素之间的类质同象也是较为重要的一种赋存形式。

The Yangliuping Cu-Ni-Pt deposit in Danba was formed in Hercynian Period with 0.05-4.01g/t Pt. PGE minerals are sperrylite, testibiopalladite and stibiopalladinite with grain size of 0.2-100μm. The PGE minerals are associated with pyrrhotite, Ni-bearing pyrrhotite, pyrite, chalcopyrite and carbonate and silicate minerals. PGE occur as isomorphism, too.