四川省小金县仰天窝毒砂金矿地质特征及成矿条件研究
发布时间：2018-08-30 11:41
【摘要】：仰天窝金矿位于松潘~甘孜地槽褶皱系阿坝地块东南部,被夹峙于北东向的龙门山深大断裂带和松潘—金川断裂带之间。本文利用地球化学手段,分别讨论岩体、围岩、矿石中的元素特点,研究成矿物质来源,并结合野外地质工作,分析研究其成矿地质条件,以加深对此类型矿床的认识,指导找矿。矿区目前共发现含金石英脉矿体6条,均产出于石英闪长岩与三叠系侏倭组砂、板岩的内外接触带中,围岩主要为变质石英砂岩和角岩,矿体多切穿岩体和围岩。脉体宽度0.3m~1.8m不等,延伸30~110m。矿脉属多金属硫化物石英脉,主要矿石矿物有毒砂和黄铁矿、黄铜矿,其次为闪锌矿,褐铁矿、孔雀石、磁铁矿等含量很少;脉石矿物主要为石英。矿体受地层、构造的双重控制,且与石英闪长岩浅成侵入体密切相关。通过地球化学数据分析发现:矿石中Au平均品位达4.7g/t,且与As、Ag、Sb等元素呈明显正相关,相关系数达0.83~1。As、Ag明显富集于围岩当中,说明成矿物质主要来源于地层。整个赋矿岩系的稀土元素配分模式有相似之处:右倾、Eu负异常,Ce弱负异常。但矿石的REE总量极低:1.86~2.14×10-6,其稀土元素配分特征与围岩、岩体均有较大差异,独与角岩极为相似,同时Au、As、Cu等成矿元素含量均呈现出砂、板岩—角岩—矿石依次递增的现象,说明成矿和角岩的形成具有一致性。对区内地质特征研究发现,本区成矿地质条件良好,具有较好找矿潜力。本矿床的成矿条件有如下特征:三叠系侏倭组(T3zh)砂、板岩是本矿床的控矿岩层,矿体具有明显的层控特征,地层为初始矿源层;控矿构造为两组北东向压扭型陡倾断裂构造及其之间剪切构造所形成的破碎带,矿体主要以剪切型雁列式脉状矿体的形式产出;钙碱性岩浆岩体与成矿关系密切,不仅为成矿提供了热源,也提供了部分流体来源。
[Abstract]:Yangtianwo gold deposit is located in the southeast of the Songpan-Ganzi geosyncline fold system Aba block and is perched between the Longmenshan deep fault zone and the Songpan-Jinchuan fault zone. In this paper, the characteristics of elements in rock mass, surrounding rock and ore are discussed by geochemical means, and the source of ore-forming material is studied. Combined with field geological work, the geological conditions of ore-forming are analyzed and studied in order to deepen the understanding of this type of deposit. Guide the prospecting. At present, six gold-bearing quartz vein orebodies have been found in the mining area, all of which occur in quartz diorite and Triassic pygmy sand. The inner and outer contact zones of slate are mainly metamorphic quartz sandstone and hornstone, and the orebody penetrates through rock mass and surrounding rock. The vein body width 0.3m~1.8m is not equal, extending 30 ~ 110m. The main ore minerals are arsenopyrite and pyrite, chalcopyrite, followed by sphalerite, limonite, malachite, magnetite, etc. The orebody is controlled by strata and structures and is closely related to the quartz diorite shallow intrusion. Through the analysis of geochemical data, it is found that the average grade of Au in ore is 4.7 g / t, and there is a significant positive correlation with elements such as As,Ag,Sb, and the correlation coefficient is 0.83-1.As-Ag is obviously enriched in the surrounding rock, indicating that the ore-forming material is mainly derived from strata. The REE distribution patterns of the whole ore-bearing series are similar: the negative anomaly of EU and the weak negative anomaly of ce are found in the right dip. However, the total amount of REE of ore is very low: 1.86% 2.14 脳 10 ~ (-6), its REE partition characteristics and surrounding rock mass, rock mass are all quite different, only and hornstone are very similar, at the same time, Au,As,Cu and other ore-forming element contents all show sand, slate, hornstone and ore increase in turn. The results show that the metallogenesis is consistent with the formation of hornstones. It is found that the ore-forming geological conditions in this area are good and the prospecting potential is good. The ore-forming conditions of the deposit are as follows: (1) the T3zh sand of Triassic, slate is the ore-controlling strata of the deposit, the orebody has obvious stratigraphic characteristics, and the formation is the initial source bed; The ore-controlling structure is a broken zone formed by two groups of N-E compression-torsional steep-dip fault structures and their interfacial shear structures, the orebodies are mainly produced in the form of shearing geese vein orebodies, and the calc-alkaline magmatic bodies are closely related to mineralization. It not only provides heat source for mineralization, but also provides partial fluid source.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51
本文编号：2212961
[Abstract]:Yangtianwo gold deposit is located in the southeast of the Songpan-Ganzi geosyncline fold system Aba block and is perched between the Longmenshan deep fault zone and the Songpan-Jinchuan fault zone. In this paper, the characteristics of elements in rock mass, surrounding rock and ore are discussed by geochemical means, and the source of ore-forming material is studied. Combined with field geological work, the geological conditions of ore-forming are analyzed and studied in order to deepen the understanding of this type of deposit. Guide the prospecting. At present, six gold-bearing quartz vein orebodies have been found in the mining area, all of which occur in quartz diorite and Triassic pygmy sand. The inner and outer contact zones of slate are mainly metamorphic quartz sandstone and hornstone, and the orebody penetrates through rock mass and surrounding rock. The vein body width 0.3m~1.8m is not equal, extending 30 ~ 110m. The main ore minerals are arsenopyrite and pyrite, chalcopyrite, followed by sphalerite, limonite, malachite, magnetite, etc. The orebody is controlled by strata and structures and is closely related to the quartz diorite shallow intrusion. Through the analysis of geochemical data, it is found that the average grade of Au in ore is 4.7 g / t, and there is a significant positive correlation with elements such as As,Ag,Sb, and the correlation coefficient is 0.83-1.As-Ag is obviously enriched in the surrounding rock, indicating that the ore-forming material is mainly derived from strata. The REE distribution patterns of the whole ore-bearing series are similar: the negative anomaly of EU and the weak negative anomaly of ce are found in the right dip. However, the total amount of REE of ore is very low: 1.86% 2.14 脳 10 ~ (-6), its REE partition characteristics and surrounding rock mass, rock mass are all quite different, only and hornstone are very similar, at the same time, Au,As,Cu and other ore-forming element contents all show sand, slate, hornstone and ore increase in turn. The results show that the metallogenesis is consistent with the formation of hornstones. It is found that the ore-forming geological conditions in this area are good and the prospecting potential is good. The ore-forming conditions of the deposit are as follows: (1) the T3zh sand of Triassic, slate is the ore-controlling strata of the deposit, the orebody has obvious stratigraphic characteristics, and the formation is the initial source bed; The ore-controlling structure is a broken zone formed by two groups of N-E compression-torsional steep-dip fault structures and their interfacial shear structures, the orebodies are mainly produced in the form of shearing geese vein orebodies, and the calc-alkaline magmatic bodies are closely related to mineralization. It not only provides heat source for mineralization, but also provides partial fluid source.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51
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