地气场信息源解析及其在隐伏金属矿勘查中的应用研究
发布时间：2019-01-10 13:37
【摘要】：地气测量是上世纪80年代诞生的一种新的找矿技术方法,其对于探测隐伏金属矿床而言具有平面投影定位较准确、探测灵敏度高的特点,是目前探测隐伏矿床的重要手段之一。本文以地气迁移模型实验为基础,对地气迁移规律及地气场源区进行了初步探讨,以桂北大厂隐伏锌铜矿为例进行了金属矿床地气场源区解析,并利用地气探测手段对滇西东山铅锌矿床以及拉拉铜矿外围红泥坡-板山头地区进行了探测应用与找矿预测。地气迁移实验结果表明,无论是单矿层模型还是矿体+围岩模型,在有热量驱动的上升气流作用下,主成矿元素及其他微量元素均有不同程度的迁出,表明由于深部隐伏矿体存在而引起的上升地气流中主成矿元素地气异常是客观存在的。由于各元素相对于地气流的活性不同,造成了不同的元素具有不同的迁出率与迁出比。围岩对于地气场具有较明显的影响,一方面围岩对于上升的气流具有捕集作用,从而减弱上升气流中主成矿元素的含量,但随着积累时间的增加会导致围岩中元素含量的增加,进而会增加上升地气流中元素含量,从而加大异常;另一方面,围岩中本身主成矿元素的含量对经过围岩后的地气流产生影响,表现为围岩中本身金属元素被萃取到经过的地气流中,从而增大近地表或地表获得的异常强度。但综合而言,能够真正形成高强度的地气异常主要还是隐伏矿体所致。以桂北大厂隐伏锌铜矿床为例进行了地气场源区示踪研究,利用地质统计学中元素聚类分析与因子分析进行源区解析,结果表明,由于确定的异常下限来源于各地质体贡献组分归一化后的系统数据,因此在这个系统背景下形成的强烈异常主要为矿致异常,且其具有异常强度相对较大而异常范围相对较小的特点。利用地气探测手段对东山铅锌矿床及拉拉铜矿外围红泥坡-板山头地区进行了找矿应用与找矿预测,结果表明地气测量对于探测半隐伏-隐伏金属矿床是切实有效的,其在矿体上方均形成了非常明显的主成矿元素异常,探测灵敏度很高,有效探测矿体埋藏深度可达500m以上(东山矿床)。与此同时,对东山矿区F18、F3断层展布区域进行了找矿预测,指明了找矿方向;对拉拉铜矿外围红泥坡-板山头地区进行了找矿预测工作,在钠质火山岩展布区域获得了明显的地气与土壤Cu、Zn、Pb异常,并圈定了重点异常区作为找矿靶区。
[Abstract]:Geophysical survey is a new prospecting technique born in 1980s. It has the characteristics of accurate plane projection location and high detection sensitivity. It is one of the most important methods to detect concealed ore deposits at present. Based on the model experiment of earth gas migration, this paper preliminarily discusses the law of earth gas migration and the source region of earth gas field. Taking Dachang concealed zinc and copper deposit in northern Guangxi as an example, the source region of earth gas field of metal deposit is analyzed. The application and prospecting prediction of Dongshan Pb-Zn deposit in western Yunnan and the Hongnipo-Banshantou area around Lala Copper Mine are carried out. The experimental results show that the main ore-forming elements and other trace elements migrate out in varying degrees under the action of heat driven updraft, regardless of the single ore-bed model or the ore-body surrounding rock model. It is shown that the anomalies of the main ore-forming elements in the upwelling air flow caused by the existence of deep concealed orebodies are objective. Different elements have different migration rate and migration ratio due to the different activity of each element relative to the ground airflow. The surrounding rock has obvious influence on the gas field. On the one hand, the surrounding rock has a trapping effect on the upward air flow, thus weakening the content of the main ore-forming elements in the updraft, but with the increase of accumulation time, the content of the elements in the surrounding rock will increase. Furthermore, it will increase the element content in the upwelling air flow, thus increasing the anomaly. On the other hand, the content of the main ore-forming elements in the surrounding rock has an effect on the ground air flow after passing through the surrounding rock, which shows that the metal elements in the surrounding rock are extracted into the passing ground flow, thus increasing the anomalous strength obtained near the surface or the surface of the earth. But generally speaking, it is mainly caused by concealed orebodies that can really form high-intensity anomaly of earth gas. Taking Dachang concealed zinc-copper deposit in northern Guangxi as an example, the source region of gas field is studied. The source region is analyzed by element cluster analysis and factor analysis in geostatistics. The results show that, Since the determined lower limit of anomalies is derived from the normalized system data of the contribution components of the various plastids, the strong anomalies formed in this system background are mainly mineral-induced anomalies. And its anomaly intensity is relatively large and anomaly range is relatively small. The prospecting application and prospecting prediction of Dongshan Pb-Zn deposit and Hongjiapo-Banshantou area around Lala Copper Mine are carried out by means of geo-gas detection. The results show that geo-gas survey is effective in detecting semi-concealed and concealed metal deposits. The main ore-forming elements anomaly has been formed over the orebody, and the detection sensitivity is very high. The buried depth of the orebody can be over 500m (Dongshan deposit). At the same time, the prospecting prediction is carried out on the distribution area of fault F18 / F3 in Dongshan mining area, and the prospecting direction is pointed out. In this paper, the ore prospecting and prediction work is carried out in the Hongjiapo-Banshantou area in the periphery of Lala Copper Mine. The obvious Cu,Zn,Pb anomalies of the earth gas and soil are obtained in the distribution area of sodium volcanic rocks, and the key anomalous areas are delineated as the prospecting target areas.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2;P632.5
本文编号：2406376
[Abstract]:Geophysical survey is a new prospecting technique born in 1980s. It has the characteristics of accurate plane projection location and high detection sensitivity. It is one of the most important methods to detect concealed ore deposits at present. Based on the model experiment of earth gas migration, this paper preliminarily discusses the law of earth gas migration and the source region of earth gas field. Taking Dachang concealed zinc and copper deposit in northern Guangxi as an example, the source region of earth gas field of metal deposit is analyzed. The application and prospecting prediction of Dongshan Pb-Zn deposit in western Yunnan and the Hongnipo-Banshantou area around Lala Copper Mine are carried out. The experimental results show that the main ore-forming elements and other trace elements migrate out in varying degrees under the action of heat driven updraft, regardless of the single ore-bed model or the ore-body surrounding rock model. It is shown that the anomalies of the main ore-forming elements in the upwelling air flow caused by the existence of deep concealed orebodies are objective. Different elements have different migration rate and migration ratio due to the different activity of each element relative to the ground airflow. The surrounding rock has obvious influence on the gas field. On the one hand, the surrounding rock has a trapping effect on the upward air flow, thus weakening the content of the main ore-forming elements in the updraft, but with the increase of accumulation time, the content of the elements in the surrounding rock will increase. Furthermore, it will increase the element content in the upwelling air flow, thus increasing the anomaly. On the other hand, the content of the main ore-forming elements in the surrounding rock has an effect on the ground air flow after passing through the surrounding rock, which shows that the metal elements in the surrounding rock are extracted into the passing ground flow, thus increasing the anomalous strength obtained near the surface or the surface of the earth. But generally speaking, it is mainly caused by concealed orebodies that can really form high-intensity anomaly of earth gas. Taking Dachang concealed zinc-copper deposit in northern Guangxi as an example, the source region of gas field is studied. The source region is analyzed by element cluster analysis and factor analysis in geostatistics. The results show that, Since the determined lower limit of anomalies is derived from the normalized system data of the contribution components of the various plastids, the strong anomalies formed in this system background are mainly mineral-induced anomalies. And its anomaly intensity is relatively large and anomaly range is relatively small. The prospecting application and prospecting prediction of Dongshan Pb-Zn deposit and Hongjiapo-Banshantou area around Lala Copper Mine are carried out by means of geo-gas detection. The results show that geo-gas survey is effective in detecting semi-concealed and concealed metal deposits. The main ore-forming elements anomaly has been formed over the orebody, and the detection sensitivity is very high. The buried depth of the orebody can be over 500m (Dongshan deposit). At the same time, the prospecting prediction is carried out on the distribution area of fault F18 / F3 in Dongshan mining area, and the prospecting direction is pointed out. In this paper, the ore prospecting and prediction work is carried out in the Hongjiapo-Banshantou area in the periphery of Lala Copper Mine. The obvious Cu,Zn,Pb anomalies of the earth gas and soil are obtained in the distribution area of sodium volcanic rocks, and the key anomalous areas are delineated as the prospecting target areas.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2;P632.5
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