投稿时间：2024-09-11
修订日期：2025-06-30
网络发布日期：2025-08-26
中文摘要:北秦岭灰池子外围出露大量的花岗伟晶岩脉，以往在该地区进行了一些铀矿勘查工作，但由于当时的认识水平、政策以及工作程度低等原因，在该地区的找矿效果不佳。文章结合研究区内花岗伟晶岩的地质成因和铀矿成矿特征，采用地面伽马总量测量与活性炭吸附测氡相结合的技术方法来确定该地区放射性异常的分布范围。根据镜下光薄片以及样品测试分析，研究区内放射性异常主要为铀元素引起，铀元素的原生铀矿物主要为晶质铀矿和铀钍石，且以一种晶型较好的形态、细脉状或较自形粒状赋存于黑云母花岗伟晶岩中。通过地面伽马总量测量在地表圈定矿脉露头，追索异常走向，活性炭吸附测氡在地下确定氡异常的分布特征，连续情况。创新了一套“地质-（地表+地下）地球物理”的勘查技术组合，通过工程验证，在该地区发现最大厚度1.96 m、品位0.084%的工业矿体，铀矿资源量达到中型矿床规模，实现了河南省铀矿找矿突破，为北秦岭地区的花岗伟晶岩型铀矿勘查工作提供了一套新的技术方法。
Abstract:A large number of granite pegmatite veins developed and exposed in the periphery of the North Qinling Huichizi granitic pluton. Previous uranium exploration work has been carried out in this area, but due to the low level of understanding, policies, and work at that time, there was no good prospecting effect in this area. This article combines the geological genesis and uranium mineralization characteristics of granite pegmatite in the study area, and uses a combination of ground gamma total measurement and activated carbon adsorption radon measurement technology to determine the distribution range of radioactive anomalies in the area. According to the analysis of polished thin sections and sample testing, the main cause of radioactive anomalies in the study area is uranium element. The primary uranium minerals of uranium element are mainly uraninite and uranthorite, and they occur in a well crystallized form, fine vein like or relatively euhedral granular form in biotite granitic pegmatite. By measuring the total amount of gamma radiation on the ground, the outcrop of mineralized veins is delineated on the surface, and the strike of radioactive anomalies is traced. The underground distribution characteristics of radon anomalies are determined by activated carbon adsorption radon measurement. An innovative exploration technology combination of "geology - (surface+underground) geophysics" has been developed, and applied to exploration target identification & testing, an industrial ore body with a maximum thickness of 1.96m and a grade of 0.084% has been discovered in the area. The uranium resources have reached the scale of medium-sized deposits, achieving a breakthrough in uranium exploration in Henan Province and providing a new technical method for the exploration of granite pegmatite type uranium deposits in the northern Qinling region.
keywords:North Qinling biotite granite pegmatite total ground gamma radiation measurement activated carbon adsorption radon measurement uraninite
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基金项目:本文得到国家自然科学基金项目（编号：41173059、41872079）和中国地质调查局项目（编号：12120115014301、12120113075800）联合资助
引用文本：
芦光播,刘莹,张媛,张苏恒,徐红超,王海涵,曲凯.2025.北秦岭灰池子岩体外围放射性物探在花岗伟晶岩型铀矿床勘查中的应用[J].矿床地质,44(4):829~844LU GuangBo,LIU Ying,ZHANG Yuan,ZHANG SuHeng,XU HongChao,WANG HaiHan,QU Kai.2025.Application of radioactive geophysical exploration on periphery of Huichizi granitic pluton in North Qinling in exploration of granitic pegmatite-type uranium deposits[J].Mineral Deposits44(4):829~844
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