印尼苏拉群岛塔里阿布铁矿矿床地质研究

发布时间：2018-05-01 21:47

本文选题：矽卡岩矿床 + 磁铁矿　；参考：《南京大学》2015年硕士论文

【摘要】：塔里阿布铁矿是包括作者在内的我国地质工作者近年来在印度尼西亚苏拉群岛新发现的大型矽卡岩型磁铁矿床。苏拉群岛在大地构造上属东南亚陆缘壳体的北缘,地处东亚陆缘壳体南西缘与澳大利亚壳体、菲律宾海壳体的交接部位,是环太平洋成矿带的组成部分,也是东南亚锡铁成矿带的延伸地区域。该岛成矿地质条件非常有利,但以往的地质工作程度很低,找矿工作则是空白。本文通过野外第一手资料的综合分析,研究了铁矿床的地质特征,确定了矿床成因类型,划分了五个成矿阶段,总结了找矿规律,建立了找矿标志,作为在东南亚森林覆盖区快速、精准寻找大型铁矿的一个成功案例,论文对该地区的找矿勘查和深入研究矽卡岩—矿浆型磁铁矿的成因有重要的应用价值和科学意义。系统的矿床学研究表明,磁铁矿矿体产于花岗岩体与上石炭统上岩组(Pzmm)碳酸盐层的接触带附近,围岩主要为矽卡岩、大理岩和花岗岩。矿体形态以似透镜状或透镜状或似层状为主,磁铁矿为铁的主体赋存形式。矿体总体走向近EW向,长大于2000m,倾向延伸48-620m,矿体平均厚度28.4m,倾角一般30°～45°,TFe平均品位为35.07%。初步探明铁资源量超过1.5亿t。矿石矿物主要为磁铁矿石,局部含有一定量的闪锌矿、黄铜矿,地表局部发育褐铁矿化;脉石矿物主要为透辉石。矿石结构主要为粒状结构,次为交代结构。矿石构造主要为团块状构造,浸染状构造。本矿床的铁矿石易选,矿石加工技术性能较好,矿石可以回收的主要元素是铁,磁铁矿主要呈单晶或连晶嵌布。主要的嵌联矿物为透辉石等硅酸盐矿物,嵌联关系较为简单,大多呈较规则毗连。研究揭示,磁铁矿主要形成于氧化物阶段,而闪锌矿及黄铜矿等硫化物主要形成于硫化物阶段。与磁铁矿化关系密切的围岩蚀变为矽卡岩化。在矿化部位同时发育强矽卡岩化,特别是大量透辉石、透闪石及蛇纹石与磁铁矿伴生,成为重要找矿标志。该矿床以矽卡岩型为主体,兼具矿浆贯入型。目前认为,成矿物质主要来自地壳重熔的花岗质岩浆,成矿流体主要为花岗质岩浆晚期-期后热液。该区铁矿床找矿标志主要包括接触带标志(岩浆和地层)、构造标志、遥感标志、航磁标志、围岩蚀变标志及磁性土标志。
[Abstract]:The Tarim Abu iron mine is a large skarn magnet deposit found in the Sura archipelago of Indonesia, including the author of the author in recent years. The Sura archipelago is the northern margin of the crust of the Southeast Asian continental margin on the geodetic tectonics, located in the South West edge of the continental margin of East Asia and the shell of the Australian Grand Leah, and the junction of the shell of the Philippines sea. It is an integral part of the ring Pacific metallogenic belt and the extension area of the tin iron metallogenic belt in Southeast Asia. The geological conditions of this island are very favorable, but the previous geological working degree is very low and the prospecting work is blank. In this paper, the geological characteristics of the iron deposit are studied and the genetic type of the ore deposit is determined by the comprehensive analysis of the first hand data in the field. Five metallogenic stages are divided and ore prospecting rules are summarized and ore finding marks are set up. As a successful case of rapid and accurate search for large iron ore in the forest cover area in Southeast Asia, the paper has important application value and scientific significance to the prospecting and deep study of skarn and pulp type magnetite in this area. The bed study shows that the magnetite ore body is located near the contact zone between the granite body and the upper Carboniferous rock group (Pzmm) carbonates, and the surrounding rock is mainly skarn, marble and granite. The orebodies are mainly lenticular or lenticular or like stratiform, and magnetite is the main form of iron. The ore body is generally near to EW and is longer than 2000m. It tends to extend 48-620m, the average thickness of the ore body is 28.4m, the dip angle is generally 30 to 45 degrees, the average grade of TFe is 35.07%., and the initial exploration of the iron resources exceeds 150 million T. ore minerals is mainly magnetite. There is a certain amount of sphalerite, chalcopyrite, and the surface part of the earth is brownish iron mineralization, and the gangue minerals are mainly diopside. The ore structure is mainly granular. The ore structure is mainly a metasomatic structure. The ore structure is mainly mass structure and dipping structure. The iron ore of this deposit is easy to be selected, the ore processing technology is good, the main element of ore recovery is iron, the magnetite is mainly monocrystalline or polycrystalline. The main embedded minerals are diopside silicate minerals such as diopside, and the inlay relation is simple and large. The study reveals that the magnetite is mainly formed in the oxide stage, while the sulfide and the chalcopyrite are mainly formed in the sulfide phase. The surrounding rock alteration, which is closely related to the magnetite mineralization, is transformed into skarnalization. The strong skarnalization is developed at the mineralized site, especially a large number of diopside, tremolite, serpentine and magnets. Associated with ore, it has become an important ore finding symbol. The deposit is mainly composed of skarn type. It is believed that the metallogenic material mainly comes from the granitic magma of the crustal remelting, and the ore-forming fluid is mainly the late stage post phase hydrothermal fluid. The ore prospecting marks in this area include the sign of the contact zone (magma and formation) and the structural sign. Remote sensing mark, aeromagnetic sign, wall rock alteration mark and magnetic soil sign.

【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.31

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