摘要
硫是铁矿中的有害元素。峨口铁矿中硫主要以磁黄铁矿和黄铁矿两种形式存在。本区硫化物有三个形成期次。第一期为变质作用形成的星点状硫化物；第二期为变质后热液阶段形成的脉状硫化物；第三期为后期热液阶段形成的裂隙充填式硫化物。硫同位素研究表明，虽然硫化物主要有三个期次，但硫的来源是一致的，均来源于基性－超基性火山岩，经原岩恢复为深海相拉斑玄武岩。矿石及近矿围岩中硫化物的硫均来自于矿段本身。
Sulfur is an unfavourable element in iron ore. Pyrite, pyrrhotin andchalcopyrite are the sulfur minerals in Ekou iron ore. Three formation stages have beenrecognized for these minerals.The first is metamorphic stage resulting in dotted .sulfurminerals.The second is fluid stage of late metamorphism resulting in laminated sulfurminerals.The third is hydrothermal stage after metamorphism resulting in crack - fillingsulfur minerals. Isotopic study shows that all the sulfides formed in the three stages havethe same sulfur provenance which is basic-ultrabasic volcanic rocks. The restoration fororiginal pre - metamorphic rock suggest that they be tholeiite of deep marine. The sulfurin the .sulfides born in iron ore and connecting rocks comes from their own sections of theore deposits.
出处
《世界地质》
CAS
CSCD
1996年第3期37-40,共4页
World Geology
关键词
铁矿床
硫化物
成因
iron ore, sulfide genesis, isotope
