本文選題：鉛鋅礦 + 花崗巖　； 參考：《南京大學》2015年碩士論文

【摘要】：內蒙古自治區(qū)庫倫旗臥力吐鉛鋅礦床產于中亞造山帶南部邊緣靠近華北古陸的部位,是近年來發(fā)現(xiàn)和探明的大型矽卡巖型礦床�？辈榻Y果表面在30～34線間已獲得的(121b+122b+333)鉛鋅金屬量和平均品位分別為：Pb 19.36×104t,1.27%、Zn29.11×104t,1.90%。伴生有用組分為：Ag278.05t,18.18g/t；Cu12235.52t,0.08%。礦區(qū)內與成礦有關的沉積地層主要是晚石炭統(tǒng)石咀組石灰?guī)r、粉砂巖和泥巖,其總體傾向NW,傾角55。-66。；侵入巖主要是黑云母二長花崗巖。礦區(qū)的礦石類型可分為鉛鋅大理巖、鉛鋅花崗巖和鉛鋅矽卡巖三類。金屬礦物主要為閃鋅礦、方鉛礦和黃鐵礦,其次為磁黃鐵礦、毒砂、磁鐵礦和黃銅礦,并含少量白鐵礦、毒砂、斑銅礦和輝銀礦。脈石礦物主要為透輝石、綠簾石、綠泥石、石英、方解石、白云石和鐵白云石,并有少量透閃石、陽起石和石榴石。圍巖蝕變主要有透輝石化、綠簾石化、綠泥石化、硅化、碳酸鹽化和黃鐵礦化,局部有石榴石化、透閃石和陽起石化。礦石結構以各種不同自形程度的粒狀結構為主,其次為各種交代結構結構。礦石構造均以脈狀、網(wǎng)脈狀、斑雜狀、角礫狀和浸染狀為主。脈狀礦石的脈寬多幾毫米至3厘米。塊狀礦石僅局部出現(xiàn)。礦區(qū)內黑云母二長花崗巖的產出方式可以分為相互連接的兩個部分：1)產狀陡立的東部巖株狀主侵入體；2)從巖株西側伸出的舌狀侵入體。這個巖舌從巖株西側的深部向西伸出,往NW方向上升后侵位,其產狀總體上與圍巖石咀組地層一致,均向SE傾斜,表明巖舌巖漿的上升和侵位主要受該組地層的層間裂隙和破碎帶控制。舌狀巖體的總體積大約0.05km3。根據(jù)鉆孔巖芯分析結果,整個礦區(qū)共圈出了40多個規(guī)模不等的鉛鋅礦體,其中資源量最大、品位最高的三個主礦體(1號、2號和3號)均產在巖舌的下接觸帶附近。這幾個主礦體之間還普遍發(fā)育不同強度的鉛鋅礦化。與之成鮮明對照的是,巖舌的上接觸帶附近只有很小的礦體和不夠工業(yè)品位的礦化。鉛鋅主礦體雖然緊鄰巖舌之下,但其成礦流體和物質不可能是巖舌的直接產物。這是因為,迄今尚無可信的機制說明高溫流體能克服浮力而從舌狀巖體往下流動,然后在其下盤卸載成礦。同時,如此小的巖舌本身難以提供一個大型礦床所需要的鉛鋅,巖舌很快的冷卻速度也使之難以在其巖漿固結之前,從與之相通的巖株獲得足夠的上升流體加以補充。本文認為,成礦流體和金屬主要來自舌狀體旁側的巖株巖體或者更深的部位,舌狀巖體下盤成礦的主要機制是對深部流體起了隔擋作用。在舌狀巖體冷凝固結之后,其東側的巖株巖漿可能正在結晶而尚未完全固結,仍有釋放成礦流體的潛力。來自巖株深部巖漿體的成礦流體沿其附近的裂隙系統(tǒng)上升,因被已經固結的舌狀巖體隔擋而聚集于其下方,并卸載而形成了工業(yè)礦體。在地殼淺部矽卡巖型礦床的形成深度內,似層狀—舌狀花崗巖體可能普遍存在。在這類巖體與深部上升流體共存的地段,要特別注意其下盤的找礦潛力。作者還認為,似層狀—舌狀巖體對深部上升流體的隔擋機制,也適用于是中溫熱液和淺成熱液等其它一些熱液礦床類型,在找礦工作中應當同樣加以重視。本論文還提出了臥力吐礦區(qū)下一步找礦的有利地段。
[Abstract]:The the Inner Mongolia Autonomous Region Kulun banner lying lead-zinc deposit, located in the southern edge of the Central Asian orogenic belt, near the North China paleo land, is a large skarn type deposit discovered and explored in recent years. The results of the 30~34 lines have been obtained on the surface of the 30~34 lines: Pb 19.36 x 104t, 1.27%, Zn29.11 x 10, respectively. 4T, 1.90%. associated useful components are: Ag278.05t, 18.18g/t; Cu12235.52t, and the sedimentary strata related to mineralization in the 0.08%. mining area are mainly Late Carboniferous stone Tsui formation limestone, siltstone and mudstone, its overall tendency is NW, dip 55.-66., and intrusive rocks are mainly black mica two long granitic rocks. Ore types can be divided into lead, zinc, marble, lead and zinc ore There are three types of granite and lead-zinc skarn. Metal minerals are sphalerite, galena and pyrite, followed by pyrrhotite, arsenopyrite, magnetite and chalcopyrite, with a small amount of hematite, arsenopyrite, porphyrite and silver ore. The gangue minerals are mainly diopside, epidote, chlorite, quartz, calcite, dolomite and dolomite. The rock alteration mainly includes dioptrite, epidote, chlorinization, silicification, carbonation, and pyrite mineralization, with pomegranate fossilization, tremolite and positive petrifaction. The ore structure is mainly granular structure with various degrees of self shape, followed by various metasomatic structures. The ore structures are all with pulse and net veins. Form, variegated, breccia and disseminated mainly. The pulse width of the vein is more than 3 centimeters to 3 cm. The lump ore only occurs locally. The output mode of the biotite two granite in the mining area can be divided into two interconnected parts: 1) the steep Eastern rock type main intrusive body; 2) the tongue like intrusive body extending from the west side of the rock plant. The rock tongue protruded westward from the deep west side of the rock strain to the NW direction and emplacement, and its occurrence was in general consistent with the stone Tsui formation in the surrounding rock and inclined to the SE, indicating that the rise and emplacement of the rock tongue magma were mainly controlled by the interlayer fissure and fracture zone of the formation. The overall product of the tongue rock mass is about 0.05km3. based on the analysis of core core. A total of more than 40 lead-zinc orebodies of different sizes were found in the mining area, with the largest amount of resources, and the three main ore bodies (No. 1, No. 2 and 3) of the highest grade were all near the lower contact zone of the rock tongue. The ore body and the mineralization of insufficient industrial grade. Although the main ore body of lead and zinc is near the rock tongue, the ore-forming fluid and substance may not be the direct product of the rock tongue. This is because there is no credible mechanism to date that the high temperature fluid can overcome the buoyancy and flow down from the tongue like rock mass. The tongue itself is difficult to provide a lead and zinc needed for a large deposit. The fast cooling rate of the tongue also makes it difficult to add enough upward fluid to the rock plant that is connected to it before its magma is consolidated. This article holds that the ore-forming fluid and metal are mainly from the rock mass of the side of the tongue or the deeper part, the tongue like rock mass. The main mechanism of the footwall mineralization is to block the deep fluid. After the condensation of the tongue like rock mass, the magma on the east side of the rock may be crystallizing but not completely consolidated and still has the potential to release the ore-forming fluid. In the depth of the formation of the shallow skarn type deposits in the crust, the layered - tongue like granitoid may exist universally. In this kind of rock mass, where the deep ascending fluid coexists, we should pay special attention to the prospecting potential of its footwall. It is also suitable for some other types of hydrothermal ore deposits, such as warm and shallow hydrothermal fluids, and other types of hydrothermal ore deposits in the deep rising fluid. This paper also puts forward a favorable location for the next step of ore prospecting in the mining area of lying force spitting.
【學位授予單位】：南京大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.4

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本文編號：1964772