河草坑地区铀成矿视电阻率异常环境研究及找矿潜力分析

发布时间：2018-04-17 18:03

本文选题：河草坑地区 + 蚀变花岗岩　；参考：《东华理工大学》2017年硕士论文

【摘要】：河草坑地区位于武夷山多金属成矿带中段,处于大富足复式岩体的西部边缘,该带同时也是我国一条重要的铀成矿带,具有优越的铀成矿地质条件。经前人勘查找矿,揭露的矿体主要集中在350~50m标高段受构造断裂控制、富含多金属硫化物的“绿色”蚀变花岗岩内,探明深度不超过300m。分析认为,深部还有极大的找矿空间。本文结合“武夷山成矿带中段河草坑地区铀矿资源调查评价”项目,以河草坑地区与铀矿化密切相关的“绿色”蚀变花岗岩为研究对象,通过音频大地电磁测深视电阻率资料解释,对研究区深部视电阻率变化特征与铀矿化关系进行分析,探讨河草坑地区铀成矿视电阻率异常环境。笔者首先在已知铀矿床区的赋矿部位开展了精细的音频大地电磁测深研究,旨在通过与已知勘探剖面对比,探讨赋矿区蚀变花岗岩视电阻率异常特征,研究表明:铀成矿有利部位(蚀变花岗岩带)的视电阻率异常变化范围为500~1000?·m之间。以此为依据,圈定了研究区各条断面上蚀变花岗岩的分布范围。在对全区所有二维视电阻率断面反演解释基础上,结合地质资料,分别绘制了标高100m、0m、-100m、-300m、-500m各深度上的视电阻率平面等值图。利用不同深度的视电阻率异常平面变化特征和控矿、赋矿构造的伸展状态,从整体上分析了蚀变花岗岩在各个深度的平面分布范围。综合各测线二维反演剖面图和各深度视电阻率平面等值图,依据铀成矿视电阻率异常环境条件,绘制了铀成矿有利地段三维空间分布图与蚀变花岗岩厚度分布图,推断了花岗岩“绿色”蚀变带的空间展布,导矿、控矿构造伸展状态,并最终在研究区确定了五处具有找矿潜力的有利地段,为进一步铀矿找矿提供了重要依据。
[Abstract]:The Hetaokeng area is located in the middle section of the Wuyishan polymetallic metallogenic belt and on the western edge of the Dafu complex rock mass. It is also an important uranium metallogenic belt in China and has favorable geological conditions for uranium mineralization.By previous exploration and prospecting, the exposed ore bodies are mainly concentrated in the "green" altered granite with rich polymetallic sulphides and controlled by structural faults, and the proven depth is not more than 300 m.It is concluded that there is still great prospecting space in depth.Based on the project of "investigation and Evaluation of uranium Resources in Hecaokeng area in the Middle part of Wuyishan metallogenic Belt", this paper takes the "green" altered granite closely related to uranium mineralization as the research object.Based on the interpretation of apparent resistivity data of Audio magnetotelluric sounding, the relationship between the variation characteristics of deep apparent resistivity and uranium mineralization in the study area is analyzed, and the anomalous environment of uranium metallogenic apparent resistivity in Hetaokeng area is discussed.In this paper, a detailed Audio magnetotelluric sounding study has been carried out in the ore-bearing area of known uranium deposits. The purpose of this study is to discuss the abnormal characteristics of apparent resistivity of altered granite in the ore-hosting area by comparing with known exploration profiles.The results show that the abnormal range of apparent resistivity in the favorable part of uranium mineralization (altered granite belt) ranges from 500 to 1000? M.Based on this, the distribution range of altered granite on each section of the study area is delineated.On the basis of the inversion interpretation of all two-dimensional apparent resistivity sections in the whole area, and combined with geological data, the plane equivalent maps of apparent resistivity at the depth of 100mg ~ 100m-1 ~ 300m ~ 500m are drawn respectively.Based on the characteristics of plane variation of apparent resistivity anomaly and the extensional state of ore-hosting structure at different depths, the plane distribution range of altered granite in each depth is analyzed.According to the anomalous environment conditions of uranium ore-forming apparent resistivity, the three-dimensional spatial distribution map and the thickness distribution map of altered granite are drawn according to the anomalous environment conditions of uranium metallogenic resistivity according to the 2-D inversion profile of each survey line and the plane equivalent map of the apparent resistivity of each depth.The spatial distribution, ore-conducting and ore-controlling tectonic extension of the "green" altered zone of granite are inferred. Finally, five favorable areas with prospecting potential are determined in the study area, which provides an important basis for further uranium prospecting.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P619.14;P631.3

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