云南省景洪疆锋磁铁矿床地质特征及找矿预测

发布时间：2018-05-27 10:40

本文选题：磁铁矿 + 变质作用　；参考：《昆明理工大学》2015年硕士论文

【摘要】：云南景洪疆锋磁铁矿位于勐龙宽谷形盆地的南西端,是三江成矿带的组成部分,产于元古界大勐龙群变质岩中,属于海相基性火山喷流-沉积-变质型磁铁矿床。本文在综合研究前人研究成果以及野外实地现场调研的前提下,通过对该矿区的矿床地质特征、控矿因素、成矿规律等方面系统研究,对矿床成因提出了新的认识,并补充相关依据。总结了研究区的找矿标志,指出了找矿方向,圈定了找矿靶区。并对研究区的找矿前景进行了评价。主要取得了如下成果和认识：1.矿体大多成似层状、条带状、透镜状产出,赋存在Ptdm地层层位,主要在大勐龙群下段第二、三层。受岩性控制明显,主要赋存在矽卡岩中。部分矿体受断层影响。矿石结构较为单一,为半自形-它形粒状结构。矿石构造常见有：块状构造、浸染状构造、斑块状构造、条带状构造等,以浸染状构造为主。2.通过查阅整理相关前人研究总结得出,主要通过同位素资料分析,得到矿物质来源主要来自上地幔或地壳深部,并经历多期变质作用富集成矿。3.通过对疆锋铁矿的控矿因素研究发现,该矿区成矿受到地层(Ptdm).岩性(矽卡岩)、构造(疆锋背斜南东翼,纵向断层F4、F10挟持地段,受部分横向断层影响切断)、围岩蚀变等因素控制。以岩性和地层为主要控制因素。4.通过研究该矿区的成矿地质条件、矿床成因、控矿因素,结合对物探磁异常图的分析,对疆锋铁矿的成矿远景区进行预测,提出矿区中部(10-36号勘探线间)有较大的找矿前景,圈定了26-36号勘探线之间为未来找矿靶区；大勐龙群下段第二层(Ptdm1-2)的找矿空间较大。
[Abstract]:Yunnan Jinghongjiang geomagnetite is located at the western end of the Menglong wide valley basin and is a part of the Sanjiang metallogenic belt. It occurs in metamorphic rocks of the Proterozoic Dumenglong Group and belongs to the marine basic volcanic jet sedimentary metamorphic magnetite deposit. On the premise of synthetically studying the former research results and the field investigation in the field, this paper systematically studies the geological characteristics, ore-controlling factors and metallogenic rules of the ore deposit, and puts forward a new understanding of the genesis of the deposit. And supplement the relevant basis. This paper summarizes the prospecting criteria of the study area, points out the prospecting direction and delineates the prospecting target area. The prospect of prospecting in the study area was evaluated. The main achievements and understandings are as follows: 1. The orebodies are mostly layered, banded and lenticular, occurring at the Ptdm stratigraphic site, mainly in the second and third layers of the lower part of the Damenglong Group. Obviously controlled by lithology, mainly occurs in skarn. Some orebodies are affected by faults. The ore structure is relatively simple, which is a semi-automorphism-it-shaped granular structure. Ore structures include block structure, disseminated structure, patch structure, stripe structure and so on. Through the review and collation of related previous studies, it is concluded that, mainly through the analysis of isotopic data, the source of minerals mainly comes from the upper mantle or deep crust, and experienced multiple metamorphic enrichment mineralization .3. By studying the ore-controlling factors of Xinjiang Feng Iron Mine, it is found that the ore-forming of this ore area is affected by the formation of Ptdmcor. Lithology (skarn), structure (southward eastern wing of Xinjiang front anticline, longitudinal fault F4 / F10 entrainment, controlled by some transverse faults, wall rock alteration and so on). Taking lithology and strata as the main controlling factors. By studying the ore-forming geological conditions, ore genesis and ore-controlling factors, combining with the analysis of geophysical magnetic anomaly map, this paper predicts the metallogenic prospective area of Xinjiang Feng Iron Mine, and points out that there is a great prospect of prospecting between No. 10-36 Prospecting Line in the middle of the mining area. The prospecting space of Ptdm1-2 in the lower part of Damenglong Group is relatively large.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.31

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