人工重砂在蚀变岩金矿勘查中的应用——以宁夏树龙沟金矿为例
发布时间：2019-01-29 03:35
【摘要】：蚀变岩型金矿床中金常以"大颗粒金"形式存在,但针对其在蚀变矿化带中分布规律的研究相对缺乏。而且,采样及分析化验方法选择不当会导致测试结果与真实情况存在较大偏差,影响客观准确地评价找矿潜力。本文对宁夏树龙沟金矿床开展人工重砂研究,以期确定金的赋存状态、研究自然金的分布规律,以此指导区内相关勘查工作的具体部署。树龙沟金矿床为蚀变岩型金矿,受区内NE向断裂构造控制,从蚀变中心向两侧分别发育石英黄铁矿化带-伊利石黄铁矿化带-伊利石绿泥石化带,蚀变带宽度累计约10~20 m。采集的101件人工重砂样品中含自然金样品共计74件,其中粗粒金(0.07 mm)样品总量达62.4%。通过区内各类蚀变(矿化)相关的矿物与金含量关系的系统对比后发现:(1)自然金含量与褐铁矿呈正相关关系,与石英呈负相关关系,与黄铁矿的关系复杂;(2)伊利石黄铁矿化带中的自然金含量高于石英黄铁矿化带和伊利石绿泥石化带;(3)矿区基性岩脉与金无成因联系,基性脉岩及其后期破碎为金矿化提供了构造通道。本文认为在该区找矿工作中应该将伊利石黄铁矿化及石英黄铁矿化作为重要的找矿标志。本矿床自然金属于粗粒-巨粒,矿石中金含量的测定应选用针对明金的过筛火试金等分析方法。
[Abstract]:Gold in altered rock type gold deposit often exists in the form of "large grain gold", but the study on its distribution in altered mineralization zone is relatively scarce. Moreover, the improper selection of sampling and analysis methods will lead to a large deviation between the test results and the real situation, which will affect the objective and accurate evaluation of the prospecting potential. In this paper, a study of artificial heavy sand is carried out on the Shulonggou gold deposit in Ningxia in order to determine the occurrence state of gold and to study the distribution law of natural gold, so as to guide the specific arrangement of the related exploration work in the area. The Shulonggou gold deposit is a altered rock type gold deposit, which is controlled by the NE trending fault structure in the area. From the alteration center to the two sides, the quartz pyrite belt and the Illite green mud petrochemical belt are developed respectively. The width of the alteration zone is about 10 ~ 20 m. A total of 74 samples containing natural gold were collected from 101 artificial heavy sand samples, of which the total amount of coarse grained gold (0.07 mm) was 62.4%. It is found that (1) the natural gold content has a positive correlation with limonite, a negative correlation with quartz, and a complex relationship with pyrite; (2) the natural gold content in the Illite pyritization zone is higher than that in the quartz pyrite zone and the Illite green mud zone, (3) the basic vein of the mining area has no genetic relationship with the gold, and the basic-dike rocks and their later fragmentation provide the structural channel for the gold mineralization. In this paper, it is suggested that Illite pyrite and quartz pyrite should be regarded as important prospecting indicators in the prospecting work in this area. The natural gold in this deposit belongs to coarse grain and giant grain.
【作者单位】： 中国地质大学(北京)地球科学与资源学院;中国石油华北油田分公司勘探开发研究院;中国地质大学(武汉)资源学院;江苏省地质调查研究院;
【基金】：宁夏石嘴山市树龙沟 麦子井金铜矿预查项目(2013DKJJ08)资助
【分类号】：P618.51
[Abstract]:Gold in altered rock type gold deposit often exists in the form of "large grain gold", but the study on its distribution in altered mineralization zone is relatively scarce. Moreover, the improper selection of sampling and analysis methods will lead to a large deviation between the test results and the real situation, which will affect the objective and accurate evaluation of the prospecting potential. In this paper, a study of artificial heavy sand is carried out on the Shulonggou gold deposit in Ningxia in order to determine the occurrence state of gold and to study the distribution law of natural gold, so as to guide the specific arrangement of the related exploration work in the area. The Shulonggou gold deposit is a altered rock type gold deposit, which is controlled by the NE trending fault structure in the area. From the alteration center to the two sides, the quartz pyrite belt and the Illite green mud petrochemical belt are developed respectively. The width of the alteration zone is about 10 ~ 20 m. A total of 74 samples containing natural gold were collected from 101 artificial heavy sand samples, of which the total amount of coarse grained gold (0.07 mm) was 62.4%. It is found that (1) the natural gold content has a positive correlation with limonite, a negative correlation with quartz, and a complex relationship with pyrite; (2) the natural gold content in the Illite pyritization zone is higher than that in the quartz pyrite zone and the Illite green mud zone, (3) the basic vein of the mining area has no genetic relationship with the gold, and the basic-dike rocks and their later fragmentation provide the structural channel for the gold mineralization. In this paper, it is suggested that Illite pyrite and quartz pyrite should be regarded as important prospecting indicators in the prospecting work in this area. The natural gold in this deposit belongs to coarse grain and giant grain.
【作者单位】： 中国地质大学(北京)地球科学与资源学院;中国石油华北油田分公司勘探开发研究院;中国地质大学(武汉)资源学院;江苏省地质调查研究院;
【基金】：宁夏石嘴山市树龙沟 麦子井金铜矿预查项目(2013DKJJ08)资助
【分类号】：P618.51
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