东天山觉罗塔格地区阿齐山第一铁矿矿床成因研究

发布时间：2018-04-12 23:22

  本文选题：东天山 + 阿齐山第一铁矿　； 参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：东天山成矿带在上世纪是中国铁矿的重点找矿区。尤其是哈密地区,有着最多的铁矿资源和极富前景的成矿潜力。但该区铁矿的地质研究程度普遍较低,研究者对于一些典型铁矿床的成因存在着分歧和争议,例如雅满苏铁矿和红云滩铁矿。因此,在觉罗塔格地区选取典型铁矿床进行剖析,对于理解区域内铁矿的成矿作用、成矿规律以及区域大地构造演化是很有必要的。觉罗塔格地区阿齐山第一铁矿赋存于雅满苏组火山岩中。其主矿体以似层状形态产出,与围岩的界线清晰。矿石主要有矿浆型和热液型两类,主矿体主要由的矿浆型矿石组成,热液型贫矿矿石则表现为纹层状和浸染状。热液蚀变矿石中矿物结晶顺序为石榴子石→阳起石-透闪石→磁铁矿-镜铁矿-石英-绿帘石→石英-碳酸盐-黄铜矿,据此可将热液蚀变作用分为石榴子石阶段、透闪石/阳起石-磁铁矿/赤铁矿-石英-绿帘石阶段、石英-碳酸盐-黄铜矿阶段。该顺序与典型矽卡岩矿床中矽卡岩矿物的结晶顺序相一致。流体包裹体测温数据表明:石榴子石中流体包裹体的均一温度有120~160℃和180~220℃两个峰值,其均为次生包裹体均一温度;绿帘石中流体包裹体均一温度峰值为200~240℃,这与石英流体包裹体均一温度的高温峰值一致(180~240℃),此峰值代表磁铁矿-赤铁矿-绿帘石阶段温度范围;石英中流体包裹体均一温度还有一个低温峰值(120~160℃),代表着石英-碳酸盐-硫化物阶段的温度。综合来看,阿齐山第一铁矿属于矿浆-热液复合型矿床,可归类为潜火山岩型矿床。本次研究选取了围岩中X150714-8英安斑岩样品进行锆石U-Pb年代学测试以及Hf同位素分析,其30颗锆石的加权平均年龄为350±2 Ma(MSWD=0.21),代表了英安斑岩的结晶年龄,也可代表阿齐山第一铁矿的成矿年龄。这与雅满苏铁矿、红云滩铁矿、百灵山铁矿、多头山铁矿以及库姆塔格石膏菱铁矿矿床形成的时代同期。对矿区内围岩样品地球化学数据的分析表明,阿齐山第一铁矿形成于大陆弧的大地构造背景中。
[Abstract]:East Tianshan metallogenic belt was the key ore area of iron ore in China in the last century.Especially in Hami area, there are the most iron ore resources and the very promising metallogenic potential.However, the degree of geological study of iron ore in this area is generally low, and there is disagreement and controversy about the origin of some typical iron deposits, such as Yamensu Iron Mine and Hongyuntan Iron Mine.Therefore, it is necessary to select a typical iron deposit in Jolotag area to understand the metallogenic process, metallogenic law and tectonic evolution of the area.The first iron ore deposit of Aceh Mountain in Jolatag area is located in the volcanic rocks of Yamansu formation.The main orebody is produced in the similar stratiform form, and the boundary between the main orebody and the surrounding rock is clear.There are two main types of ore: slurry type and hydrothermal type. The main ore body is mainly composed of slurry type ore, while the hydrothermal lean ore is characterized by laminar and disseminated ore.In the hydrothermal alteration ore, the order of mineral crystallization is pomegranate, catalite, tremolite, magnetite, vitrinite, quartz, verdanite, carbonate and chalcopyrite, according to which the hydrothermal alteration can be divided into the pomegranate stage.Tremolite / actinolite-magnetite / hematite-quartz-green curtain stage, quartz-carbonate-chalcopyrite stage.This sequence is consistent with the crystallization sequence of skarn minerals in typical skarn deposits.The temperature data of fluid inclusions show that the homogenization temperatures of fluid inclusions in pomegranate have two peaks of 120 ~ 160 鈩，

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