陕西金龙山金矿带腰俭矿段地质地球化学特征及深部成矿预测

发布时间：2018-10-13 14:47

【摘要】：金龙山金矿是位于南秦岭镇旬盆地丁-马Hg-Sb矿带西部的超大型微细浸染型金矿床,自东向西分划分为金龙山、腰俭、丘岭和古楼山四个矿段,目前,对腰俭矿段的研究程度较低。为了加快对金龙山金矿深部成矿预测及矿区东部汞锑矿带内找金的研究,本文选择对腰俭矿段地质特征、矿石矿物特征、地球化学特征进行研究,总结次生及原生晕地球化学特征,对210号矿体深部成矿进行预测,为下一步找矿提供指示信息。本文通过大量野外地质调查,特别是在对210号矿体地质特征详细研究的基础上,通过采集标本、样品,并进行加工、分析测试,对210号矿体的矿石特征、矿物特征、金的赋存状态等进行了深入研究。查明210号矿体整体呈北东向展布,地表主要为氧化矿石,深部主要为原生矿石。矿石构造主要为角砾状、脉状、浸染状、土状、蜂窝状构造等。矿石结构主要为自形、半自形、它形不等粒状结构,三连晶结构,增生环带结构,填隙结构,交代残余结构等。金属矿物有黄铁矿、含砷黄铁矿、毒砂、辉锑矿、方铅矿、自然金、褐铁矿等。脉石矿物主要为石英和方解石。通过电子探针测试未见到自然金,但测到了金含量,结合相邻金龙山矿段金的赋存状态,金可能以包裹金形式出现。通过对腰俭矿段水系沉积物异常和土壤测量异常特征研究,发现近矿元素Au主要分布在丘岭-西坡岭一带。金矿(化)体上呈现As、Hg、Au、Ag元素异常值相对较高,异常的点数多,面积大,浓集中心突出。通过对210号矿体原生晕地球化学进行综合研究,相关性和聚类分析显示,Au比较独立,As、Sb、Hg相关性较好,Cu、Pb、Zn、N i相关性好。在不同标高,前缘元素Hg、Sb,近矿元素Au、尾晕元素Mo、W等有多期叠加,说明该地段可能有多期热液活动。另外,矿体有向南西西侧伏的特点。金品位变化与矿体厚度之间有弱的正相关关系。综上研究,将前缘元素Hg、Sb,近矿元素Au,尾晕元素Mo的异常叠加在纵投影图上显示,210号矿体深部可能存在2个预富集区,分别是预测靶位1:20-3线之间,820-900m标高之间;预测靶位2:20-3线之间,830-880m标高之间。
[Abstract]:Jinlongshan gold deposit, located in the west of the Ding-Ma Hg-Sb ore belt in the ten-day basin of South Qinling Town, is a super-fine disseminated gold deposit. It is divided from east to west into four sections: Jinlongshan, Yaojian, Qiuling and Guloshan. At present, the gold deposit is divided into four sections: Jinlongshan, Yaojian, Qiuling and Guloshan. The study on the ore section is low. In order to speed up the study of deep metallogenic prediction of Jinlongshan gold deposit and the exploration of gold in the mercury antimony ore belt in the east of the mining area, the geological characteristics, ore mineral characteristics and geochemical characteristics of the Yaojian section are studied in this paper. The geochemical characteristics of secondary and primary halo are summarized and the ore-forming in depth of No. 210 orebody is predicted. Based on a large number of field geological investigations, especially on the basis of the detailed study of the geological characteristics of the 210 orebody, the ore features and mineral characteristics of the 210 orebody are analyzed and tested by collecting samples, processing and testing. The occurrence state of gold is deeply studied. It is found that the 210 ore body is distributed from north to east, the surface is mainly oxidized ore, and the deep ore is mainly primary ore. Ore structure is mainly breccia, vein, disseminated, soil-shaped, honeycomb structure and so on. The ore structure mainly consists of self-shape, semi-automorphism, its unequal granular structure, triple crystal structure, accretive ring structure, interstitial structure, metasomatic residual structure and so on. Metallic minerals include pyrite, arsenopyrite, stibnite, galena, natural gold, limonite and so on. Gangue minerals are mainly quartz and calcite. The natural gold was not found by electron probe test, but the gold content was measured. Combined with the occurrence state of gold in adjacent Jinlongshan mine, gold may appear in the form of wrapped gold. By studying the characteristics of sediment anomaly and soil survey anomaly in Yaojian section, it is found that the near ore element Au mainly distributes in the area of Qiuling and Xipo mountains. The abnormal value of As,Hg,Au,Ag elements is relatively high on the gold (chemical) body, the number of abnormal points is more, the area is large, and the concentration center is prominent. Based on a comprehensive study of the primary halo geochemistry of the 210 orebody, the correlation and cluster analysis show that Au is relatively independent, As,Sb,Hg is well correlated and Cu,Pb,Zn,N I is well correlated. At different elevation, Hg,Sb, near ore element Au, tail halo element Mo,W is superimposed in several phases, which indicates that there may be multi-period hydrothermal activity in this area. In addition, the orebody has the characteristic of lying to the west and south. There is a weak positive correlation between gold grade change and orebody thickness. Based on the above study, the superposition of the anomaly of Au, tail halo element Mo in the front element Hg,Sb, near the ore element Au, shows that there may be two preconcentration areas in the depth of the 210 orebody, which are between 1: 20-3 lines and 820-900m elevation, respectively. The predicted target is between 2: 20-3 lines and 830-880 m elevation.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51

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