汉南杂岩区毕机沟一带钒钛磁铁矿成矿规律及综合勘查技术研究

发布时间：2018-01-27 00:26

本文关键词： 钒钛磁铁矿成矿规律综合勘查技术毕机沟一带汉南杂岩区　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：汉南杂岩区毕机沟一带是秦岭造山带重要的铁矿资源基地,该区带的找矿工作自二十世纪五十年代末以来一直进行,然而,受找矿思路及工作手段方面的限制,汉南地区磁铁矿勘查工作除毕机沟以外大部分仍停留在地表工作阶段,本文利用毕机沟钒钛磁铁矿床作为汉南地区典型矿床进行研究,总结成矿规律,提出适用于本区带找矿的综合勘查技术,进一步指导左溪地区找矿工作实践。本文的主要研究成果如下:(1)毕机沟一带磁铁矿矿化受岩相控制较为密切,区内磁铁矿体主要赋存于含铁高的异剥辉长岩或角闪辉长岩中,矿体常集中于韵律层底部,中粒、粗粒各种辉长岩相互层更迭出现处往往出现较厚矿层,韵律性层状构造、流线构造发育是形成磁铁矿化的构造标志;热液活动为矿体后期富集提供热力学条件,使含铁造岩矿物蚀变析出铁而形成微细粒磁铁矿,使磁铁矿体厚度增大、品位增高,从而达到了后期改造富集。(2)毕机沟钒钛磁铁矿床的后期热液改造作用不容忽视,矿床类型应为岩浆晚期分异-热液改造复合型。(3)毕机沟一带寻找磁铁矿的目标岩性与非目标岩性之间存在明显的磁性差异,通过区内毕机沟钒钛磁铁矿床的找矿经验研究,认为在汉南地区寻找磁铁矿床“地质填图+地面高精度磁测+工程验证”为最佳勘查手段。(4)通过“地质填图+地面高精度磁测+工程验证”综合勘查手段在毕机沟南侧左溪辉长岩体区开展地质工作,取得较好的效果,发现数条具有工业价值的磁铁矿体。
[Abstract]:The Bijiegou area of Hannan complex is an important iron ore resource base in the Qinling orogenic belt. The prospecting work in this zone has been carried out since the end of 1950s. However, it is limited by the ideas and means of ore prospecting. Most of the exploration work of magnetite in Hannan area except Bijigou is still at the surface working stage. In this paper, the Bijigou vanadium titanomagnetite deposit is used as a typical deposit in Hannan area, and the metallogenic regularity is summarized. A comprehensive exploration technique suitable for prospecting in this area is put forward to further guide the prospecting practice in Zuoxi area. The main research results of this paper are as follows: 1) the mineralization of magnetite in Bijiegou area is controlled by lithofacies. The magnetite bodies in this area are mainly located in heteropyroxene or hornblende gabbro with high iron content. The orebodies are usually concentrated at the bottom of the rhythmic layer, and the thicker ore beds are often found in the interbedded areas of various gabbro layers with medium grain and coarse grain. Rhythmic stratified structure and streamline structure are the structural markers of magnetite formation. Hydrothermal activity provides thermodynamic conditions for the late enrichment of orebodies, resulting in the alteration and precipitation of iron from iron-bearing rock-bearing minerals and the formation of microgranular magnetite, which increases the thickness and grade of magnetite bodies. Thus the late hydrothermal transformation of the Bijigou vanadium titanomagnetite deposit can not be ignored. The ore deposit type should be the complex type of late magmatic differentiation and hydrothermal transformation. There is obvious magnetic difference between the target lithology of magnetite and the non-target lithology in Bijiegou area. The ore prospecting experience of Bijigou vanadium titanomagnetite deposit in this area is studied. It is considered that finding magnetite deposit in Hannan area "verification of geological mapping surface high precision magnetic survey engineering" is the best exploration method. Geological work was carried out in the area of Zuoxi gabbro body south of Bijigou by means of "ground high precision magnetic survey engineering verification of geological mapping". Some magnetite bodies with industrial value were found.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.31

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