本文選題：地質(zhì)背景 + 地質(zhì)特征��； 參考：《東華理工大學(xué)》2015年碩士論文

【摘要】：“萍鄉(xiāng)市上栗縣志木山銅多金屬礦區(qū)”位于江西省萍鄉(xiāng)市北北西的金山鎮(zhèn),該礦床位于江西省中西部。南側(cè)為揚子板塊與華廈板塊分界斷裂—萍鄉(xiāng)~廣豐深斷裂帶,北側(cè)為宜豐~景德鎮(zhèn)深斷裂帶與江南隆起帶相鄰,隸屬欽杭結(jié)合帶。通過對前人資料的系統(tǒng)查閱、野外考察及綜合分析,在礦區(qū)地質(zhì)特征、成礦成因、成礦規(guī)律及找礦預(yù)測等方面提出一些認識與看法,歸納起來有以下幾點:1.本礦區(qū)位于欽杭結(jié)合帶東段(江西段)西端,燕山期殼幔物質(zhì)調(diào)整,熱流體上升,地殼活化重組,I型中酸性巖漿侵入及期后熱液成礦,引發(fā)內(nèi)生金屬成礦大爆炸,成礦大地構(gòu)造環(huán)境優(yōu)越。2.通過礦區(qū)地層資料,認為下二疊統(tǒng)棲霞組鈣質(zhì)泥巖夾粉~泥晶灰?guī)r、中二疊統(tǒng)小江邊組泥晶灰?guī)r夾炭質(zhì)泥巖以及茅口組含生物泥晶灰?guī)r夾白云巖等,均為含鈣質(zhì)細碎屑巖或碳酸鹽巖,具備巖漿熱流交代礦床的圍巖條件。礦區(qū)以茅口組成為銅多金屬礦的直接圍巖,是因為茅口組與燕山期志木山花崗閃長斑巖體的直接接觸的結(jié)果。3.區(qū)內(nèi)滑覆斷層(F1)系宜豐~西山斷裂的西延部分,其切割深度大、形成早活動時間長,燕山早期可能成為巖漿活動期導(dǎo)巖及巖漿期后導(dǎo)礦通道,受其影響形成的次級斷裂、或所導(dǎo)致地層褶皺的層間破碎帶為成礦物質(zhì)的容礦空間。4.礦區(qū)分為南、北兩個巖體,根據(jù)礦化類型的差異,分析可能屬同源兩次侵入的產(chǎn)物。成礦流體在南部巖體形成以鎢、鐵為主的礦化,而在北部巖體則形成以銅、鉬為主的礦化;因而形成礦區(qū)“南鎢鐵、北銅鉬”礦化格局。而F1下盤原地系統(tǒng)的上三疊統(tǒng)安源組中ZK3101孔資料顯示,原巖已接受絹云母、紅柱石等角巖化熱接觸蝕變,光譜定量分析結(jié)果鋅(含黃鐵)礦化明顯。顯然,成礦順序為:鎢鐵→銅鉬→鋅、黃鐵礦。5.統(tǒng)計大量地質(zhì)資料,本礦床平行接觸帶礦體與脈狀充填礦體同存,其地質(zhì)特征與典型的接觸交代矽卡巖型礦床差異明顯。其成礦作用兼有礦漿貫入充填和熱液交代的雙重性,可定義為礦漿貫入—熱液接觸交代的廣義矽卡巖礦床。6.根據(jù)區(qū)域資料對比及成礦地質(zhì)條件分析,①礦區(qū)應(yīng)進一步加強對東段北部、以及西部銅、鉬礦找礦工作;②礦區(qū)ZK813孔在下盤原地系統(tǒng)鉆到下二疊統(tǒng)馬平組白云巖地層,熱源導(dǎo)致全巖大理巖化,尋找F1下盤巖漿巖及其接觸帶成為新的找礦思路;③在含煤碎屑巖中尋找鐵銅多金屬礦。
[Abstract]:"Zhimushan Copper polymetallic Mining area, Shangli County, Pingxiang City" is located in Jinshan Town, north and west of Pingxiang City, Jiangxi Province, which is located in central and western Jiangxi Province. In the south, the Yangtze plate and Huaxia plate are separated by the Pingxiang ~ Guangfeng deep fault zone, and the northern side is adjacent to the Jiangnan uplift belt, belonging to the Qinghang combination zone. Based on the systematic reference of previous data, field investigation and comprehensive analysis, this paper puts forward some understandings and opinions on geological characteristics, metallogenic origin, metallogenic regularity and prospecting prediction of the mining area, which can be summed up as follows: 1. The ore area is located at the western end of the eastern segment of Qinghang binding belt (Jiangxi section), where the crust and mantle materials are adjusted in Yanshanian period, the thermal fluid rises, the crust activates and recombines type I intermediate-acid magma invades and the post-epoch hydrothermal mineralization occurs, which results in a large explosion in the metallogenic process of endogenic metals. The ore-forming tectonic environment is superior. Based on the stratigraphic data of the mining area, it is considered that the calcareous mudstones of the Lower Permian Qixia formation intercalated with mudstone, the middle Permian Xiaojiangbian formation mudstone intercalated with carbonaceous mudstone, and the maokou formation containing biological mudstone intercalated with dolomite, etc. They are calcareous fine clastic rocks or carbonate rocks with the surrounding rock conditions of magmatic heat flow metasomatic deposits. Maokou is the direct surrounding rock of copper polymetallic deposit because of the direct contact between Maokou formation and Yanshanian Shimushan granodiorite. The slip fault (F1) is the westward extension of the Yi-Feng-Xishan fault, which has a large cutting depth and a long time of early activity. The early Yanshanian may become a secondary fault influenced by the magmatic activity and the post-magmatic ore conduction channel. Or the interlayer fracture zone resulting in stratigraphic fold is the ore-bearing space of ore-forming material. According to the difference of mineralization types, the ore area may belong to two intrusions of the same origin. The ore-forming fluid forms the mineralization of tungsten and iron in the southern rock mass and copper and molybdenum in the northern rock mass, thus forming the mineralization pattern of "south tungsten iron, north copper molybdenum" in the mining area. However, the ZK3101 pore data of the Upper Triassic Anyuan formation in the in-situ system of the F1 footwall show that the source rocks have accepted the thermal alteration of sericite and andalusite, and the results of spectral quantitative analysis show that the zinc (including Huang Tie) mineralization is obvious. Obviously, the metallogenic order is: tungsten, iron, copper, molybdenum, zinc, pyrite. According to a large number of geological data, the parallel contact zone ore body and the vein filling ore body co-exist, and the geological characteristics are obviously different from the typical contact metasomatism skarn type deposit. The mineralizing process has the duality of slurry penetration filling and hydrothermal metasomatism, which can be defined as the generalized skarn deposit of interpenetration and hydrothermal contact metasomatism. Based on the regional data correlation and the analysis of metallogenic geological conditions, we should further strengthen the ZK813 hole in the northern and western copper and molybdenum ore prospecting areas of the eastern section and the western part of the Jiao 2 ore deposit, and drill into the dolomite strata of the Lower Permian Maping formation in the footwall in situ system. The source of heat leads to the marble formation of the whole rock, so finding the F1 lower magmatic rock and its contact zone is a new idea for prospecting for iron and copper polymetallic deposits in coal-bearing clastic rocks.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.2

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本文編號：1844688