西天山阿吾拉勒火山岩型铁矿带东段成矿地质背景与成矿机理

发布时间：2018-03-06 13:12

本文选题：火山岩型铁矿　切入点：地质背景　出处：《岩石学报》2017年02期 　论文类型：期刊论文

【摘要】：备战、敦德、智博、查岗诺尔铁矿分布于阿吾拉勒火山岩型铁矿带东段的大哈拉军山组火山岩中,各个矿区基性、中性和酸性火山岩兼而有之,但所占比例不尽相同。矿区的火山岩以钾玄岩系列、高钾钙碱性系列、钙碱性系列岩石为主,也有少量拉斑系列岩石出露。岩石相对富集轻稀土元素,相对富集大离子亲石元素而亏损Nb、Ta和Ti等高场强元素。显示出岛弧或活动陆缘环境火山岩的固有特征。研究认为该地区铁矿床为矿浆-火山热液复合成因型铁矿床,其形成受岩浆-热液系统活动的制约,具体成矿作用包括氧化物熔离成矿、隐爆-贯入成矿、分离结晶+岩浆流动成矿和热液交代四种类型。矿床的控矿因素与成矿条件包括:(1)活动大陆边缘型火山岩组合与伸展构造环境;(2)基性和中性火山熔浆多次喷溢和堆积部位;(3)含矿母岩浆的强烈分异演化导致氧化物熔离,而分离结晶和岩浆流动则促使富集矿体形成;(4)岩浆热液对流循环并萃取围岩铁质,是形成热液期矿石的基本机制;(5)火山机构及其伴生裂隙是含矿岩浆活动的有利空间并为成矿物质的聚集提供物理化学条件,是铁矿体主要控矿因素和赋矿部位。铁矿床与火山作用关系极为密切,火山熔浆与火山热液反复多次活动导致了成矿作用的多期多阶段性。
[Abstract]:Prewar, Dunde, Zhibo and Chagannuor iron ore deposits are distributed in the volcanic rocks of the Dahala Junshan formation in the eastern section of the Awulale volcanic rock belt. The basic, neutral and acidic volcanic rocks are present in each mining area. But the proportion of volcanic rocks in the mining area is not the same. The volcanic rocks in the mining area are mainly composed of potash series, high potassium calc-alkaline series, calc-alkaline series rocks and a small amount of porphyry series rocks. The rocks are relatively rich in light rare earth elements. The relative enrichment of large ion lithophile elements and depletion of high field strength elements, such as NB, Ta and Ti, show the inherent characteristics of volcanic rocks in the island arc or active continental margin. It is considered that the iron ore deposit in this area is a magma volcanic hydrothermal complex type iron ore deposit. Its formation is restricted by the magma-hydrothermal system activities. The specific metallogenic processes include oxide fusion mineralization, crypto-explosive interpenetration mineralization, The ore-controlling factors and ore-forming conditions of the deposit include: 1) active continental margin volcanic rock assemblage and extensional tectonic environment, 2) basic and neutral volcanic magma multiple spillage and hydrothermal metasomatism, and 4 types of separation and crystallization magma flow metallogeny and hydrothermal metasomatism. The strong differentiation and evolution of the ore-bearing parent magma lead to the oxide melting, The separation crystallization and magmatic flow promote the enrichment orebody to form the magmatic hydrothermal convection circulation and extract the surrounding rock iron. The volcanic mechanism and its associated fractures are favorable spaces for the magmatic activity of ore bearing minerals and provide physicochemical conditions for the accumulation of ore-forming materials. The ore deposit is the main ore-controlling factor and ore-hosting site of the iron ore body. The ore deposit is closely related to the volcanism, and the repeated repeated activities of the magma and the volcanic hydrothermal fluid lead to the multi-period and multi-stage metallogeny.
【作者单位】：长安大学地球科学与资源学院;中国地质调查局西安地质调查中心;国土资源部岩浆作用成矿与找矿重点实验室;中国科学院广州地球化学研究所;新疆地质矿产开发局第三地质大队;
【基金】：中央高校基本科研业务费专项资金项目(310827162025) 中国地质调查局项目(12120114007501、12120113044000) 长安大学科技创新团队资助项目(310827153407)联合资助
【分类号】：P618.31

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