【摘要】：仰天窩金礦位于松潘~甘孜地槽褶皺系阿壩地塊東南部,被夾峙于北東向的龍門山深大斷裂帶和松潘—金川斷裂帶之間。本文利用地球化學手段,分別討論巖體、圍巖、礦石中的元素特點,研究成礦物質來源,并結合野外地質工作,分析研究其成礦地質條件,以加深對此類型礦床的認識,指導找礦。礦區(qū)目前共發(fā)現含金石英脈礦體6條,均產出于石英閃長巖與三疊系侏倭組砂、板巖的內外接觸帶中,圍巖主要為變質石英砂巖和角巖,礦體多切穿巖體和圍巖。脈體寬度0.3m~1.8m不等,延伸30~110m。礦脈屬多金屬硫化物石英脈,主要礦石礦物有毒砂和黃鐵礦、黃銅礦,其次為閃鋅礦,褐鐵礦、孔雀石、磁鐵礦等含量很少;脈石礦物主要為石英。礦體受地層、構造的雙重控制,且與石英閃長巖淺成侵入體密切相關。通過地球化學數據分析發(fā)現:礦石中Au平均品位達4.7g/t,且與As、Ag、Sb等元素呈明顯正相關,相關系數達0.83~1。As、Ag明顯富集于圍巖當中,說明成礦物質主要來源于地層。整個賦礦巖系的稀土元素配分模式有相似之處:右傾、Eu負異常,Ce弱負異常。但礦石的REE總量極低:1.86~2.14×10-6,其稀土元素配分特征與圍巖、巖體均有較大差異,獨與角巖極為相似,同時Au、As、Cu等成礦元素含量均呈現出砂、板巖—角巖—礦石依次遞增的現象,說明成礦和角巖的形成具有一致性。對區(qū)內地質特征研究發(fā)現,本區(qū)成礦地質條件良好,具有較好找礦潛力。本礦床的成礦條件有如下特征:三疊系侏倭組(T3zh)砂、板巖是本礦床的控礦巖層,礦體具有明顯的層控特征,地層為初始礦源層;控礦構造為兩組北東向壓扭型陡傾斷裂構造及其之間剪切構造所形成的破碎帶,礦體主要以剪切型雁列式脈狀礦體的形式產出;鈣堿性巖漿巖體與成礦關系密切,不僅為成礦提供了熱源,也提供了部分流體來源。
[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.
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.51

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