黔西北纳雍枝铅锌矿床原生晕分带特征及找矿预测

发布时间：2018-05-02 23:12

本文选题：黔西北 + 五指山　；参考：《昆明理工大学》2017年硕士论文

【摘要】：原生晕找矿法自20世纪50年代被提出以来,经过国外内诸多地质工作者与学者在不同成因类型矿床中的实践与应用,已为国内外地球化学找矿研究者所接受,被认为是一种较为成熟且有效的热液矿床找矿预测手段。纳雍枝铅锌矿床位于川滇黔铅锌成矿域的东南侧,黔中隆起的南缘及滇东隆起的西侧,是近年来于贵州省境内发现并评价的一个大型铅锌矿床,亦是五指山铅锌矿集区的一部分,矿集区内沿五指山背斜轴向发育有7个小-大型铅锌矿床,已探明和发现的矿体多达20余个,其中纳雍枝矿床是该矿集区内储量最大的典型矿床。.通过对纳雍枝矿床4号勘探线及1270中段进行详细的地质编录和采样,采用分带序列研究、数理统计分析和原生晕组成比对等方法,系统地研究了该矿床V-1号矿体原生晕的分带特征,其研究内容主要包括以下三个方面:①原生晕中指示元素的组成和强度;②各带的分布范围、大小及形状;③组份的分带与集合,并在此基础上对深部区域的含矿性作出了评价。其研究结果表明:①利用格里戈良分带指数法进行计算,纳雍枝铅锌矿床V-1号矿体轴向分带序列为Mo-Ni-Sn-Co-Cu-Zn-Cd-Hg-Pb-As-Sb-Mn;②原生晕在空间上延伸有限,前缘晕-近矿晕-尾晕明显,前缘晕元素组合为Ag-Sb-Mn;近矿晕元素组合为Zn-Pb-Cd-Hg;尾晕元素组合为Cu-Ni-SnCo-Mo;③成晕指示元素在空间上的强度具有由浅部向深部内带范围增大,且在深部中段的近矿晕于尾晕有一定程度重合的规律性变化;④成晕指示元素在空间上的形态展布具有与矿体近似的平行分带特征,轴向分带序列与火山热液型铅锌矿床原生晕分带存在较为明显的差异:⑤通过对成晕元素进行多元统计分析,认为指示元素组合的分带性受矿床成因控制明显,成晕元素组合与矿石矿物的元素组合具有较大的关联性;⑥因子分析的研究结果表明,该矿床成矿温度为低温,且成矿物质来源具有深源的特征;⑦通过研究因子得分在空间上的分布形态规律,表明成矿元素在成矿过程中产生了差异性沉淀,且流体在运移过程中分异特征明显。⑧通过原生晕对应分带元素的比值建立了找矿指标,指标表面在靠近背斜核部的深处找矿指示元素再次富集,具有良好的找矿前景。
[Abstract]:Since the primary halo prospecting method was put forward in 1950s, through the practice and application of many geologists and scholars in different genetic types of deposits, it has been accepted by domestic and foreign geochemical prospecting researchers. It is considered to be a more mature and effective method for ore prospecting and prediction of hydrothermal deposits. The Nayongzhi Pb-Zn deposit is located in the southeast of the Pb-Zn metallogenic domain in Sichuan, Yunnan and Guizhou, the southern margin of the central Guizhou uplift and the west side of the eastern Yunnan uplift. It is a large Pb-Zn deposit discovered and evaluated in Guizhou Province in recent years. It is also a part of the Wuzhishan lead-zinc ore concentration area, where there are 7 small and large lead-zinc deposits developed along the leaning axis of the Wuzhishan backside, and more than 20 ore bodies have been discovered and discovered. The Nayongzhi deposit is the typical deposit with the largest reserves in the ore concentration area. Through the detailed geological cataloguing and sampling of the exploration line No. 4 and the middle section 1270 of the Nayongzhi deposit, the methods of zonation sequence study, mathematical statistical analysis and primary halo composition alignment are adopted. The zonation characteristics of the primary halo in the V-1 orebody of the deposit are systematically studied. The main contents of the study include the following three aspects: the composition of the indicating elements in the primary halo and the distribution range, size and shape of the indicating elements in the primary halo. On the basis of the zonation and collection of the three components, the ore-bearing property of the deep region is evaluated. The results show that the axial zonation sequence of the V-1 ore body of the Nayongzhi Pb-Zn deposit is Mo-Ni-Sn-Co-Cu-Zn-Cd-Hg-Pb-As-Sb-Mn2 primary halo, which has a limited extension in space, and the frontal halo-near ore-area-tail halo is obvious. The leading halo element assemblage is Ag-Sb-Mn, the near ore halo element combination is Zn-Pb-Cd-Hg, and the tail halo element assemblage is Cu-Ni-SnCo-Mo-3 halo indicating that the spatial strength of the halo elements increases from shallow to deep. In the middle part of the deep section, the near ore halo and the tail halo have a certain degree of overlap. The spatial distribution of the elements indicating the formation of the halo is similar to that of the orebody, and the distribution of the elements is similar to that of the orebody. There are obvious differences between the axial zonation sequence and the primary halo zoning of volcanic hydrothermal lead-zinc deposits. Through the multivariate statistical analysis of halo elements, it is considered that the zoning of indicator element assemblages is obviously controlled by the genesis of the deposit. The results of 6 factor analysis show that the ore-forming temperature of the deposit is low and the ore-forming source has the characteristics of deep source. (7) by studying the spatial distribution pattern of factor score, it is shown that the metallogenic elements have different precipitation in the metallogenic process. In the process of migration, the differentiation characteristics of fluid are obvious .8 the prospecting index is established by the ratio of the primary halo corresponding to the zonation element, and the index surface is enriched again in the depth near the anticline core, which has a good prospecting prospect.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.4

【相似文献】