论中生代岩浆活动对海南石碌富铁矿床的改造作用

石铁矿位于海南省昌江县境内,是中国最大的富铁矿床.该矿区及其周边中生代侵入岩广泛发育,岩浆活动对矿床影响强烈,其结果主要产生两类改造型矿石,即石榴子石磁铁矿矿石和黄铁矿磁铁矿赤铁矿矿石.通过对改造型矿石的矿相学研究、矿石及矿物的硫同位素和微量元素分析,表明改造型矿石中的赤铁矿发生了磁铁矿化,其中的硫主要来源于岩浆,而铁...

Discussion on role of Mesozoic magmatism in reformation of Shilu iron deposit in Hainan

The Shilu iron ore deposit in Changjiang County of Hainan Province is the largest high-grade iron deposit in China. Mesozoic intrusions are widely distributed in and around the ore district, Intense effect of magmatism on the ore deposit yielded two types of reformed ores, i.e., garnet-magnetite ore and pyrite-magnetite-hematite ore. Mineralogy researches on the reformed ores, together with the evidence from sulfur isotope and trace elements of ores. show that hematite changed into magnetite during the reformation, with sulfur mainly derived from magma, and iron and trace elements derived from the original ore. Considering the geological characteristics of the ore deposit, it is concluded that the magmatic reformation action occurred later than the enrichment of the Shilu iron deposit, probably belonging to a kind of thermal reformation which resulted in the magnetitization of hematite without the enrichment of the ore.