青海省果洛州玛多地区多金属成矿地质特征及综合成矿预测

发布时间：2019-01-04 13:11

【摘要】：北巴颜喀拉成矿带内矿种丰富多样,已发现的有:Au、Sb、Hg、As、Cu、W等。研究区因位于该成矿带内而具有优越的构造成矿环境、丰富的成矿物质来源,其综合成矿能力大、成矿远景好。本文在总结分析地质、地球化学、地球物理、遥感等特征的基础上,指明本区找矿方向,圈定有利找矿远景区。本文取得的主要认识有以下几点:(1)研究区广泛发育的地层为三叠系地层,同时该套地层作为多种成矿元素高度富集的层位,也是本区的主要赋矿地层。研究区内的主干构造为北西向的断裂构造,其控制了研究区内岩浆岩、热液活动以及地球化学异常的分布。研究区内广泛分布的石英脉与成矿关系非常密切。研究区内的主要矿化种类为辉锑矿化,其次为辉钼矿化和孔雀石化。区内的蚀变有硅化、高岭土化、绿帘石化等,其中硅化与矿化关系最为密切。(2)Sb、As、Au、Cu、Hg、Ag等几种元素为研究区内的主要成矿元素,这一结果与区域上地球化学分带相符,同时这一结果也说明在研究区内成矿作用以中低温成矿作用为主导。(3)Sb、As、Au等元素组合成矿的可能性较大,而Ag、Cu、Hg等单独成矿的可能性较大。这为该地区的矿产评价工作确定了方向。对各成矿元素进行的分形分布研究表明,区内成矿元素的富集机制不同或者是萃取期次不同。(4)通过对各类信息对比,总结出在高海拔、高覆盖地区,以地球化学手段为主导,辅以地球物理和遥感信息的找矿方法较为有效。通过圈定地球化学综合异常,并结合区内的成矿事实,可有效地提高矿产资源评价效率。以地球化学特征和成矿地质特征为主导,在研究区共划分出5处成矿远景区,Ⅰ级远景区一处,Ⅱ级远景区一处,Ⅲ级远景区三处。各成矿远景区组合地球化学异常特征均表现出以Sb、As、Au为主异常元素的特征。
[Abstract]:The ore species in the northern Bayan Kara metallogenic belt are rich and diverse, which have been discovered: Au,Sb,Hg,As,Cu,W et al. Because it is located in the metallogenic belt, the study area has a superior tectonic metallogenic environment and abundant ore-forming material sources, its comprehensive metallogenic ability is large, and the metallogenic prospect is good. On the basis of summarizing and analyzing the characteristics of geology, geochemistry, geophysics and remote sensing, this paper points out the direction of prospecting in this area and delineates the favorable prospecting area. The main conclusions obtained in this paper are as follows: (1) the strata widely developed in the study area are Triassic strata, which are also the main ore-bearing strata in this area as a highly enriched horizon of various metallogenic elements. The main structure in the study area is a NW fault structure, which controls the distribution of magmatic rocks, hydrothermal activities and geochemical anomalies in the study area. The widely distributed quartz veins in the study area are closely related to mineralization. The main mineralization types in the study area are stibnite followed by molybdenum mineralization and peacock petrifaction. The alteration in the area includes silicification, kaolinization, green curtain fossilization, among which silicification and mineralization are the most closely related elements. (2) several elements, such as Sb,As,Au,Cu,Hg,Ag, are the main metallogenic elements in the study area. This result is consistent with the geochemical zoning in the region, and it also shows that mineralization is dominated by mineralization at moderate and low temperatures in the study area. (3) Sb,As,Au and other elements are more likely to be combined and metallogenic, while Ag,Cu, is more likely. Hg and other individual mineralization are more likely. This has set the direction for the mineral evaluation work in this area. The study on fractal distribution of metallogenic elements shows that the enrichment mechanism of ore-forming elements in this area is different or the times of extraction are different. (4) by comparing various kinds of information, it is concluded that in high altitude and high cover areas, The geochemical method, supplemented by geophysical and remote sensing information, is more effective. The evaluation efficiency of mineral resources can be effectively improved by delineating comprehensive geochemical anomalies and combining with the metallogenic facts in the area. Based on geochemical characteristics and ore-forming geological characteristics, there are five metallogenic scenic spots in the study area, one in Grade 鈪，

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