滇东北乐红—小河铅锌矿床构造控矿模式及找矿方向

发布时间：2018-02-23 16:54

本文关键词： 成矿构造解析构造控矿规律构造控矿模型找矿方向乐红-小河铅锌矿床　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：滇东北乐红-小河铅锌多金属矿床是近年来新发现的分布于川-滇-黔铅锌多金属成矿区的的大型铅锌矿床之一,矿体产出严格受构造控制。运用矿田地质力学的理论与方法,通过大比例尺构造剖面的精测及构造控矿作用的研究,进行典型成矿构造几何学、运动学、力学、构造岩、构造期次等特征的精细解析,重点进行构造形迹力学性质的鉴定和矿田构造体系的划分。在此基础上,分析了控矿构造型式,确立成矿构造体系,总结了构造控矿规律,进而探讨了构造控矿作用机制,建立构造控矿模式,指出找矿勘查方向。论文取得了以下主要成果和认识:1.乐红-小河铅锌矿区构造发育,具有多期构造活动的特征,以近SN向的渭姑背斜为主的褶皱与NE向巧家-莲峰断裂、乐马厂断裂为矿区内高级别构造,控制了矿田的分布,而乐红断裂控制了矿床的展布,旁侧的拖曳褶皱以及次一级的断裂构造、层间断裂带断裂带控制了矿体(脉)的展布,反映了构造的分级控矿作用,构成了一套断裂-褶皱-节理成矿构造系统;2.通过构造形迹力学性质鉴定,认为该矿床自加里东期以来主压应力方向主要经历了近 EW→NE45°-50°→NW50°-60°→NE45°-50°→近EW→近SN 的转变过程,反映了 6期构造活动,形成了 4种构造组合。其中印支晚-燕山早期形成的NW向构造带构成了该矿床的成矿构造格架;3.构造对矿床(体)的控制作用明显,根据不同的矿体构造与矿体的空间分布特征,确定出3种矿化样式:1)靠近乐红断裂,矿体呈透镜状、块状;2)距断裂稍远的地段,矿体呈网脉状、团块状,产于穿层构造裂隙及层间断裂带中;3)远离断裂的地段,矿体呈脉状、侵染状产出,主要产于层间断裂带中;4.确定了乐红断裂与震旦系灯影组(Z2dn)中厚层状中粗晶白云岩蚀变体的组合为矿床的成矿地质体。并划分出3类主要成矿结构面:1)岩性界面成矿结构面(Si-Ca面);2)构造成矿结构面;3)物理化学成矿结构面,主要为Eh-pH成矿结构面;5.研究总结了构造控矿规律,建立了构造控矿模式和4条找矿标志,进一步提出乐红断裂与震旦系灯影组白云岩的蚀变体的接触地带、震旦系灯影组白云岩与寒武系筇竹寺组砂岩的界面部位是该矿床有利的找矿地段,并指出6个找矿远景区。
[Abstract]:Lehong Xiaohe Pb-Zn polymetallic deposit in northeastern Yunnan is one of the large Pb-Zn deposits newly discovered in recent years. The orebody production is strictly controlled by tectonics. By studying the fine measurement of large scale structural profile and the study of tectonic ore-controlling action, the fine analysis of typical ore-forming structural geometry, kinematics, mechanics, tectonite, secondary tectonic period and so on is carried out. The mechanical properties of structural trace and the division of ore-field structural system are emphasized. On this basis, the ore-controlling structure pattern is analyzed, the ore-forming structure system is established, the rules of structural ore-controlling are summarized, and the mechanism of tectonic ore-controlling action is discussed. The paper has made the following main achievements and understanding: 1. The structure of Lehong Xiaohe lead-zinc ore area is developed and has the characteristics of multi-stage tectonic activity. The fold and NE direction Qiaojia-Lianfeng fault in Weinu anticline, near SN direction, the Lemachang fault is a high-grade structure in the mining area, which controls the distribution of ore field, while the Lehong fault controls the distribution of the deposit. The towed fold on the side and the secondary fault structure, the interlayer fault zone controls the distribution of the orebody (vein), which reflects the classification and ore-controlling action of the structure. A set of fault-fold-joint metallogenic structure system is formed. Through the identification of mechanical properties of structural trace, it is considered that the principal compressive stress direction of the deposit has mainly experienced near EW since the Caledonian period. 鈫扤E45 掳-50 掳. 鈫扤W50 掳-60 掳. 鈫扤E45 掳-50 掳. 鈫扤ear EW. 鈫扵he transition process of near SN reflects the tectonic activity of 6 periods. Four types of tectonic assemblages were formed. The NW trending tectonic belt formed in the late Indosinian and early Yanshanian periods formed the metallogenic framework of the deposit. According to the spatial distribution characteristics of different orebody structures and orebodies, it is determined that three mineralization styles: 1) near Lehong fault, lenticular ore bodies and 2 blocks are far away from the faults, orebodies are reticulated veins and lumps. The orebody occurs in vein and infective form in the area far away from the fault, occurring in the structural fissure and interlayer fault zone of the interlayer. The assemblage of Lehong fault and Z2dng (Sinian Dengying formation) is determined to be the ore-forming geological body of the deposit, and three types of main ore-forming structural plane: 1) lithologic interface have been divided. The ore-forming structural plane of Si-Ca (2) structure of ore-forming structure is 3) physico-chemical ore-forming structural plane. It is mainly Eh-pH ore-forming structure plane 5. The structural ore-controlling rules are studied and summarized, the tectonic ore-controlling model and four ore-prospecting indicators are established, and the contact zone between the Lehong fault and the altered dolomite of the Dengying formation of the Sinian system is further proposed. The interface between dolomite of Dengying formation of Sinian and sandstone of Qiongzhusi formation of Cambrian is a favorable ore prospecting area of the deposit.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.4

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