Study on Exploration Methods Combination for Uranium Deposit in the Periphery of Huayangchuan Area, Xiaoqinling Mountains
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摘要:
华阳川铀矿位于华北板块南缘小秦岭构造带西部,是一个以铀、铌共生为主,并伴生铅、稀土的多金属矿床。华阳川地区铀矿类型多样、成因复杂,具有较好的铀成矿条件和资源潜力。由于深处秦岭北坡,地形陡峻、覆盖严重,开展地表找矿工作十分困难。已往铀找矿工作采用水化学法圈定放射性异常+地面伽玛测量圈定矿化体的方法组合,一直受限于地形陡峻和地表覆盖的困扰,找矿效果不佳、效率低下。本次工作在对已有研究成果和地质资料预研究的基础上,采取以航空伽玛测量快速发现异常,以活性炭及坑内伽玛测量准确定位矿化带,以不同比例尺的专项地质填图进行矿化体检查,辅以遥感解译、激电测深及磁法测量,最后通过探矿工程验证,探索出适应华阳川地区这种高山峡谷覆盖区硬岩型铀矿快速定位的技术方法组合。通过找矿实践,在华阳川地区圈定出找矿远景区1个、找矿靶区3个和重要找矿线索6个,并在黄家沟一带发现大量铀矿床(点)。笔者通过系统总结采用的各类铀找矿技术方法,为今后同类地区铀找矿工作提供经验和借鉴。
Abstract:Huayangchuan uranium is a polymetallic deposit of uranium and niobium associated with lead and rare earth elements in the west of Xiaoqinling tectonic belt on the southern margin of North China craton. The uranium deposits have various types and complex genesis, and have good uranium metallogenic conditions and resource potential. Because Huayangchuan area is located on the north slope of Qinling Mountains, with steep terrain and serious coverage, it is very difficult to carry out surface prospecting. The combination of hydrochemical method and ground gamma survey were used to delineate mineralized bodies in the past, the exploration effect is poor and the efficiency is low due to the topography and vegetation. Based on the previous research results and existing geological data, this study adopts airborne gamma spectrum measurement to quickly find anomalies, activated carbon and pit gamma measurement to accurately identify the mineralized zone, special geological mapping with different scale to carry out mineralized body inspection, supplemented by remote sensing interpretation, IP sounding and magnetic measurement, and finally passes the verification of exploration engineering, a combination of technical methods suitable for the rapid positioning of hard rock type uranium deposits in the coverage area of high mountains and valleys in Huayangchuan area is explored. Through the prospecting practice, we have selected 7 favorable areas, 3 target areas and 6 important clues for ore prospecting, and a large number of uranium deposits (or prospecting target area) have been found in Huangjiagou area outside Huayangchuan uranium mining area. This paper systematically summarizes the various uranium prospecting techniques and methods adopted, so as to provide experience and reference for uranium prospecting in similar areas in the future.
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Key words:
- Xiaoqinling /
- Huayangchuan /
- Uranium deposit /
- prospecting methods
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图 2 1∶1万航空伽玛能谱测量成果图(底图据杨海等,2019)
Figure 2.
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