印度尼西亚塔里亚布岛锡铁多金属矿床的地质地球化学特征与成因

Geological and Geochemical Characteristics and Genesis of the Sn-Fe Polymetallic Deposit in Taliabu Island,Indonesia

印尼塔里亚布岛新近发现大型锡铁多金属矿床,初步探明铁储量超过1亿吨,全铁品位可达50%。塔里亚布岛锡铁多金属矿床以矽卡岩型与矿浆型为主,兼具热液型,构成一个完整的成矿系统。印支期二长花岗岩源自地壳部分熔融产生的岩浆,是矿床的主要成矿物质来源与控矿因素;岩浆经过高度的演化分异过程,生成富铁矿浆贯入充填成矿,主要赋存于花岗岩体与石炭系地层接触带中岩体边界形态急剧变异部位和软、硬岩层的接触界面;矽卡岩型铁矿则赋存于石炭系(白云质)大理岩及含钙质变质砂岩与花岗岩体的接触带附近。矿床成矿时属环太平洋成矿域的东澳大利亚成矿带,经喜马拉雅运动位移至东南亚成矿带。

A large-size SN-Fe polymetallic deposit, with more than one hundred million tons of iron reserves whose average grade （total Fe） is above 50%, has been recently discovered in Taliabu Island, Indonesia. Skarn and ore-magma are the main genetic types of the ore deposit, with the existence of hydrothermal type. These genetic types constitute a complete metallogenic system. The Indo-Chinese monzogranite derived from crustal partial melting magma is the main metallogenic material source and ore-control factor. Through high-degree evolution, the magma produced Fe-rich ore-magma injection and subsequently formed ore bodies, which mainly occurred in drastic variation places along rock mass boundary, soft and hard rock boundary in the contact zone between granite and Carboniferous strata. Skarn type iron ore was formed in the contact zone between Carboniferous （dolomitic） marble, calciferous metasaudstone and granite. The ore deposit belonged to Eastern Australia metallogenic belt during its formation, and then moved to Southeast Asia metallogenic belt by Himalayan movement.