發(fā)布時(shí)間：2018-05-05 20:16

  本文選題：高鉀鈣堿性侵入巖 + 礦化分帶　； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：銅陵地區(qū)是長(zhǎng)江中下游銅-鐵-硫-金多金屬成礦帶中最重要、最典型的礦集區(qū)之一。這些銅金銀鉛鋅多金屬礦床與燕山期形成的中小型高鉀鈣堿性侵入巖在空間、成因上有著密切的聯(lián)系,并且圍繞巖體表現(xiàn)出規(guī)律的成礦分帶。這種分帶特征不僅表現(xiàn)在成礦溫度、元素組合方面,還表現(xiàn)在礦床類(lèi)型、成礦機(jī)制的變化上。因此,研究礦床的成礦分帶性規(guī)律,可以更清楚地研究各礦床之間的共生關(guān)系、成礦系列和成礦模式,可以更清楚地解決礦床成因類(lèi)型以及成因機(jī)制問(wèn)題,對(duì)相似條件下的礦床的成礦預(yù)測(cè)具有相當(dāng)重要的參考和借鑒意義。本文運(yùn)用多種現(xiàn)代測(cè)試技術(shù)和手段,以銅陵地區(qū)高鉀鈣堿性侵入巖及其與之相關(guān)的獅子山礦田、姚家?guī)X礦床為主要研究對(duì)象,查明了銅陵地區(qū)高鉀鈣堿性侵入巖的展布形態(tài),建立并制作銅陵地區(qū)高鉀鈣堿性侵入巖立體模型圖;查明了與高鉀鈣堿性侵入巖相關(guān)的礦床及蝕變帶的空間分布特征、成礦元素的時(shí)空分帶規(guī)律、成礦巖體的地球化學(xué)特征及其對(duì)成礦的貢獻(xiàn)�？偨Y(jié)出銅陵地區(qū)高鉀鈣堿性侵入巖成礦分帶模式為:礦化類(lèi)型在垂向上,從深部→淺部依次為:斑巖型礦床→矽卡巖型礦床→中低溫?zé)嵋盒偷V床;在水平方向上,由巖體至圍巖依次為:斑巖型礦床→矽卡巖型礦床→中低溫?zé)嵋盒偷V床。礦石礦物在也存在明顯的分帶現(xiàn)象,自下而上:黃銅礦→磁黃鐵礦→含金黃銅(鐵)礦→鉛鋅礦;由巖體至圍巖依次為:黃銅礦→磁黃鐵礦→含金黃銅(鐵)礦→鉛鋅礦。同理,礦床中的成礦元素在空間上也有明顯的分帶規(guī)律,自深部至淺部為:銅(金)→銅、金→金、銅→金;自巖體中心向圍巖為:銅(金)→銅、金→金(銅)→銀、鉛、鋅。結(jié)合鐵、硫、鉛等同位素組成的對(duì)比研究,發(fā)現(xiàn)該礦床的成礦元素主要是來(lái)源于巖漿或巖漿熱液的。從近巖體矽卡巖→矽卡巖型礦體→近圍巖巖漿熱液型礦體,不同位置的Fe同位素組成隨著遠(yuǎn)離巖體含礦流體向外的遷移,表現(xiàn)出鐵同位素的時(shí)間和空間分帶性,說(shuō)明了成礦類(lèi)型、礦石礦物、成礦元素的分帶性與含礦流體演化密切相關(guān)。
[Abstract]:Tongling area is one of the most important and typical ore concentration areas in the copper-iron-sulfur-gold polymetallic metallogenic belt in the middle and lower reaches of the Yangtze River. These copper, gold, silver, lead and zinc polymetallic deposits are closely related to the small and medium high potassium calc-alkaline intrusive rocks formed during the Yanshanian period, and show a regular metallogenic zoning around the rock mass. This zonation feature is not only manifested in ore-forming temperature, element assemblage, but also in the change of ore deposit type and metallogenic mechanism. Therefore, the study of metallogenic zonation of ore deposits can more clearly study the symbiotic relationship, metallogenic series and metallogenic model among the deposits, and solve the problems of the genetic types and genetic mechanisms of the deposits more clearly. It is very important for ore-forming prediction under similar conditions. In this paper, the distribution of high-potassium calc-alkaline intrusive rocks in Tongling area and the associated Shizishan ore field and Yao Jialing deposit are studied by using a variety of modern testing techniques and means, and the distribution patterns of high-potassium calc-alkaline intrusive rocks in Tongling area are found out. A three-dimensional model map of high-potassium calc-alkaline intrusive rocks in Tongling area was established, and the spatial distribution characteristics of deposits and alteration zones related to high-potassium calc-alkaline intrusive rocks and the temporal and spatial zoning of ore-forming elements were found out. Geochemical characteristics of ore-forming rock mass and its contribution to mineralization. The ore-forming zonation model of high-potassium calc-alkaline intrusive rocks in Tongling area is summarized as follows: the mineralization type is vertical upward, and the order from deep to shallow is: porphyry type deposit, skarn type deposit, horizontal direction, The order from the rock mass to the surrounding rock is: porphyry type deposit, skarn type deposit, middle and low temperature hydrothermal deposit. Ore minerals also have obvious zonation phenomenon from bottom to top: chalcopyrite pyrrhotite bearing gold and brass (iron) ore, and chalcopyrite pyrrhotite bearing gold and brass (iron) ore from the rock mass to the surrounding rock in the order of: chalcopyrite pyrrhotite and gold-bearing copper (iron) ore. In the same way, the ore-forming elements in the deposit also have a distinct zonation law in space. From the deep to the shallow, they are: copper (gold), gold, copper and gold, and from the center of the rock mass to the surrounding rock, copper (gold), gold (copper), silver, lead, and so on, and from the center of the rock mass to the surrounding rock, the ore forming elements are: copper (gold), gold (copper) and silver, lead. Zinc. In combination with a comparative study of the isotopic compositions of iron, sulfur and lead, it is found that the ore-forming elements of the deposit are mainly derived from magma or magmatic hydrothermal solution. From the skarn type orebody near the rock mass and the magmatic hydrothermal orebody near the surrounding rock, the Fe isotopic composition in different positions moves outward from the ore-bearing fluid of the rock mass, showing the temporal and spatial zonation of iron isotopes. The ore-forming types, ore minerals and ore-forming elements are closely related to the evolution of ore-bearing fluids.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P618.2

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