辽西葫芦岛杨钢地区钼多金属矿成矿规律与成矿预测
发布时间：2019-04-25 17:41
【摘要】：辽宁葫芦岛杨家杖子—钢屯地区(简称杨钢地区)位于华北地台北缘燕辽成矿带其中之一的八家子—兰家沟成矿带内,地处辽宁西部,是一处重要的钼多金属成矿区。区内断裂构造发育,岩浆活动强烈,成矿条件十分有利。矿种以钼、铅锌为主,矿床成因类型包括斑岩型、矽卡岩型和斑岩—矽卡岩型。笔者在大量的野外地质工作的基础上,通过系统收集、整理和总结前人的工作成果和认识,重点选择了区内兰家沟、杨家杖子、松树卯3个典型矿床进行研究。通过对典型矿床区域地质背景、矿床地质特征、成岩成矿年代学、控矿因素等方面的研究,总结了矿床成矿规律,并建立找矿模型。取得如下成果： 1、矿田内太古界混合花岗岩和片麻岩类岩石为钼成矿提供了矿源。当其重熔沿基底断裂上侵时,深部岩浆中的钼及其在上侵时捕获的基底及盖层围岩中的钼皆富集于矿液中,当岩浆冷凝时,含钼矿液也随岩浆的结晶不断增多,当物理化学条件改变时,在一定的贮矿构造中富集成矿 2、钼矿床的形成和分布严格受构造控制。矿床均产出于区域性NE向深大断裂与EW向次级断裂交汇部位。次级断裂构造及其衍生的低次序断裂的规模、形态决定了矿体的规模、形态,也决定了矿化、蚀变的强弱及分布范围,具有明显的多级、多期次构造控矿特征。 3、矽卡岩型矿床赋矿地层主要为蓟县系灰岩和寒武—奥陶系灰岩、页岩；斑岩型钼矿主要与中生代中酸性复式侵入体有关。虽然成矿环境不尽一致,但矿床成矿物质来源均为燕山期岩浆岩(虹螺山岩体)。 4、燕山期构造—岩浆旋回是该区钼矿床形成的主要时代,矿田内与成矿有关的细粒花岗岩和花岗斑岩中钼的丰度值皆高,经电子探针测试得知细粒花岗岩和花岗斑岩中钾长石是钼的载体矿物,说明Mo来自花岗岩,特别是燕山期早侏罗世侵入的细粒花岗岩与成矿关系密切,是该区的成矿母岩。 5、以矿化带为中心,蚀变出现脉状钾长石化、云英岩化→绢英岩化→硅化、伊利石化—水白云母化→铁锰碳酸盐化→绿泥石化→碳酸盐化,而矿化主要与绢英岩化→硅化、伊利石化—水白云母化→铁锰碳酸盐化阶段关系密切,可作为找矿标志。 在总结了矿床成矿规律后,以成矿预测理论为指导,结合近几年矿山生产实践,对矿区的资源潜力进行了预测,认为矿区仍具有很好的找矿空间和资源潜力。
[Abstract]:Yangjiazhang-Gangtun area, Huludao, Liaoning Province, is located in the Bajiazi-Lanjiagou metallogenic belt, one of the Yanliao metallogenic belts on the northern margin of North China. It is located in the western part of Liaoning Province and is an important molybdenum polymetallic metallogenic area. The fault structure is developed in this area, magmatic activity is strong, and the ore-forming conditions are very favorable. The ore types are mainly molybdenum, lead and zinc. The genetic types of the deposits include porphyry type, skarn type and porphyry-skarn type. On the basis of a great deal of field geological work, by systematically collecting, sorting out and summarizing the achievements and understandings of previous work, the author chooses three typical deposits of Lanjiagou, Yangjiazi and Songshu Mao in the district to carry on the research. By studying the regional geological background, geological characteristics, diagenetic and metallogenic chronology, ore-controlling factors of typical ore deposits, the ore-forming regularity of the deposits is summarized, and the ore-prospecting model is established. The results are as follows: 1. The Archean mixed granites and gneisses in the ore field provide the ore source for molybdenum mineralization. When the remelting occurs along the basement fault, the molybdenum in the deep magma and in the basement and the surrounding rock of the capping layer are enriched in the ore fluid, and when the magma condenses, the molybdenum-bearing ore fluid increases with the crystallization of the magma, and the molybdenum in the deep magma and the basement and the surrounding rock in the capping layer are all concentrated in the ore solution when the magma condenses. When the physical and chemical conditions change, the integrated ore 2 is enriched in certain ore storage structures, and the formation and distribution of molybdenum deposits are strictly controlled by the structure. The deposits occur at the intersection of regional NE-trending deep and large faults and EW-trending secondary faults. The size and shape of the secondary fault structure and its derived low-order faults determine the size and shape of the orebody, as well as the strength and distribution range of mineralization and alteration, and have obvious multi-stage and multi-stage structural ore-controlling characteristics. 3. The ore-bearing strata of skarn deposits are mainly Jixian limestone and Cambrian-Ordovician limestone and shale, and porphyry molybdenum deposits are mainly related to Mesozoic intermediate-acid complex intrusions. Although the ore-forming environment is not identical, the ore-forming materials of the deposit are all derived from the Yanshanian magmatic rock (Hongluoshan rock mass). 4. The Yanshanian tectonic-magmatic cycle is the main age of the formation of molybdenum deposits in this area, and the abundance of molybdenum in fine granitic granites and granitic porphyry related to mineralization in the ore field is high. The K-feldspar in fine-grained granite and granite porphyry is the carrier mineral of molybdenum, which indicates that Mo comes from granite, especially the fine-grained granite intruded in Yanshanian early Jurassic is closely related to mineralization and is the ore-forming parent rock of this area. (5) taking the mineralized zone as the center, the alteration appeared vein-like potassium feldspar, Muscovite-sericite silicification, Ili-hydroMuscovite-ferromanganese carbonated, green-mudstone carbonated, and mineralized and sericite-silicified, and the mineralization was mainly related to the silicification of sericite, and the mineralization was mainly related to the silicification of sericite. The Ili-hydroMuscovite-ferromanganese carbonate stage is closely related and can be used as a prospecting indicator. Based on the theory of ore-forming prediction and the practice of mine production in recent years, the resource potential of the ore deposit is predicted, and it is considered that the ore-forming area still has good prospecting space and resource potential in the ore-forming area under the guidance of the ore-forming prediction theory and combined with the practice of mine production in recent years.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2
[Abstract]:Yangjiazhang-Gangtun area, Huludao, Liaoning Province, is located in the Bajiazi-Lanjiagou metallogenic belt, one of the Yanliao metallogenic belts on the northern margin of North China. It is located in the western part of Liaoning Province and is an important molybdenum polymetallic metallogenic area. The fault structure is developed in this area, magmatic activity is strong, and the ore-forming conditions are very favorable. The ore types are mainly molybdenum, lead and zinc. The genetic types of the deposits include porphyry type, skarn type and porphyry-skarn type. On the basis of a great deal of field geological work, by systematically collecting, sorting out and summarizing the achievements and understandings of previous work, the author chooses three typical deposits of Lanjiagou, Yangjiazi and Songshu Mao in the district to carry on the research. By studying the regional geological background, geological characteristics, diagenetic and metallogenic chronology, ore-controlling factors of typical ore deposits, the ore-forming regularity of the deposits is summarized, and the ore-prospecting model is established. The results are as follows: 1. The Archean mixed granites and gneisses in the ore field provide the ore source for molybdenum mineralization. When the remelting occurs along the basement fault, the molybdenum in the deep magma and in the basement and the surrounding rock of the capping layer are enriched in the ore fluid, and when the magma condenses, the molybdenum-bearing ore fluid increases with the crystallization of the magma, and the molybdenum in the deep magma and the basement and the surrounding rock in the capping layer are all concentrated in the ore solution when the magma condenses. When the physical and chemical conditions change, the integrated ore 2 is enriched in certain ore storage structures, and the formation and distribution of molybdenum deposits are strictly controlled by the structure. The deposits occur at the intersection of regional NE-trending deep and large faults and EW-trending secondary faults. The size and shape of the secondary fault structure and its derived low-order faults determine the size and shape of the orebody, as well as the strength and distribution range of mineralization and alteration, and have obvious multi-stage and multi-stage structural ore-controlling characteristics. 3. The ore-bearing strata of skarn deposits are mainly Jixian limestone and Cambrian-Ordovician limestone and shale, and porphyry molybdenum deposits are mainly related to Mesozoic intermediate-acid complex intrusions. Although the ore-forming environment is not identical, the ore-forming materials of the deposit are all derived from the Yanshanian magmatic rock (Hongluoshan rock mass). 4. The Yanshanian tectonic-magmatic cycle is the main age of the formation of molybdenum deposits in this area, and the abundance of molybdenum in fine granitic granites and granitic porphyry related to mineralization in the ore field is high. The K-feldspar in fine-grained granite and granite porphyry is the carrier mineral of molybdenum, which indicates that Mo comes from granite, especially the fine-grained granite intruded in Yanshanian early Jurassic is closely related to mineralization and is the ore-forming parent rock of this area. (5) taking the mineralized zone as the center, the alteration appeared vein-like potassium feldspar, Muscovite-sericite silicification, Ili-hydroMuscovite-ferromanganese carbonated, green-mudstone carbonated, and mineralized and sericite-silicified, and the mineralization was mainly related to the silicification of sericite, and the mineralization was mainly related to the silicification of sericite. The Ili-hydroMuscovite-ferromanganese carbonate stage is closely related and can be used as a prospecting indicator. Based on the theory of ore-forming prediction and the practice of mine production in recent years, the resource potential of the ore deposit is predicted, and it is considered that the ore-forming area still has good prospecting space and resource potential in the ore-forming area under the guidance of the ore-forming prediction theory and combined with the practice of mine production in recent years.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2
【参考文献】
相关期刊论文 前10条
1 肖垂斌;从杨家杖子松树卯钼矿床的成矿条件看找矿方向[J];大地构造与成矿学;1981年01期
2 代军治;毛景文;赵财胜;李，
本文编号：2465328
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2465328.html
