【摘要】：早子溝金礦是西秦嶺夏河-合作金礦帶近年來(lái)發(fā)現(xiàn)的百噸級(jí)別的中低溫?zé)嵋盒偷V床,深部仍有巨大的找礦潛力。早子溝金礦斷裂構(gòu)造控礦特征明顯,金礦體分布與斷裂構(gòu)造關(guān)系密切,在區(qū)域上具有典型性和代表性。眾多專家學(xué)者對(duì)該礦床的地球化學(xué)、成礦物質(zhì)來(lái)源、礦床成因等方面開(kāi)展了大量的研究,但對(duì)礦區(qū)構(gòu)造的研究較為薄弱。本文就是在老礦山找礦項(xiàng)目的資助下,在總結(jié)前人資料的基礎(chǔ)上,通過(guò)野外對(duì)不同方向構(gòu)造形跡的細(xì)致觀測(cè)和室內(nèi)綜合分析,從構(gòu)造應(yīng)力場(chǎng)的角度出發(fā),探討構(gòu)造與成礦的關(guān)系,旨在為深部找礦預(yù)測(cè)提供指導(dǎo)。取得的主要進(jìn)展包括:夏河-合作地區(qū)處于夏河-禮縣高角度逆沖推覆構(gòu)造帶內(nèi),區(qū)域性逆沖斷層呈NW向展布,總體向SW傾,區(qū)內(nèi)廣泛發(fā)育層間尖棱褶皺、“Z”字形褶皺,指示了區(qū)域逆沖推覆構(gòu)造為由SW向NE運(yùn)動(dòng)。在野外實(shí)地對(duì)控礦構(gòu)造詳細(xì)觀測(cè)分析的基礎(chǔ)上,利用構(gòu)造解析法、節(jié)理分析法、共軛剪節(jié)理法和斷層擦痕分析法,通過(guò)吳氏網(wǎng)投圖分析,確定了早子溝金礦床多期次構(gòu)造活動(dòng)的主應(yīng)力方向,并根據(jù)疊加和切割關(guān)系以及成巖成礦時(shí)代的確定,推斷了應(yīng)力作用的期次和時(shí)代;從而將早子溝金礦的構(gòu)造應(yīng)力場(chǎng)劃分為3期5個(gè)階段,即成礦前的海西期基底變形、印支早期區(qū)域變形和巖漿侵位階段,成礦期早階段為印支中期,NE-NEE向的擠壓導(dǎo)致了礦區(qū)SN向和NE向斷裂中發(fā)生以金為主的成礦作用,晚期階段為印支晚期,NWW向的擠壓導(dǎo)致了NW向緩傾角斷裂中發(fā)生以銻為主的成礦作用;成礦后階段斷裂活動(dòng)導(dǎo)致了礦體局部被錯(cuò)斷。進(jìn)一步分析了不同階段斷裂活動(dòng)及其成礦特征,認(rèn)為構(gòu)造應(yīng)力場(chǎng)演化與成礦作用具有一致性的特征,斷裂的多期次活動(dòng)有利于形成富大礦體,進(jìn)而指出NE向主斷裂與旁側(cè)分支斷裂的復(fù)合部位以及NE向斷裂與NW向斷裂的交匯部位為深部尋找富大礦體的有利空間。
[Abstract]:The early zicogou gold deposit is a middle and low temperature hydrothermal type deposit found in the Xia he cooperative gold belt in Western Qinling Mountains in recent years. The deep part still has great potential for ore prospecting. The characteristics of ore control in the fault structure of the early zicogou gold deposit are obvious, the distribution of gold ore body is closely related to the fracture structure, and it is typical and representative in the region. The geochemistry of the bed, the source of metallogenic material and the genesis of the deposit have been carried out a lot, but the research on the structure of the mining area is relatively weak. This paper is on the basis of the old mine prospecting projects, on the basis of summarizing the previous data, through the careful observation and the indoor comprehensive analysis of the structural trace of different directions in the field, from the tectonic stress. On the field point of view, the relationship between structure and mineralization is discussed in order to provide guidance for deep prospecting and prediction. The main progress has been made as follows: the Xia he cooperative area is located in the Xia he Lixian high angle thrust nappe belt, the regional thrust fault is distributed in the direction of NW, as a whole, to SW, and in the region, there are widely developed interlayer prismatic folds and "Z" shaped folds. The regional thrust nappe structure is directed from SW to NE. On the basis of detailed observation and analysis of the ore control structure in the field, the main stress direction of the multiple tectonic activity of the early zisogou gold deposit is determined by the structural analytic method, the joint shear method, the conjugate shear joint method and the fault scratch analysis method. The relationship between superposition and cutting, as well as the determination of the age of diagenesis and mineralization, infer the period and time of the stress action, and the tectonic stress field of the early zigogou gold deposit is divided into 3 stages, that is, the deformation of the Hercynian basement before the mineralization, the early Indosinian regional deformation and the magma emplacement stage, the early stage of the metallogenic period is the mid Indosinian and NE-NEE direction extrusion guide. The metallogeny of gold mainly occurred in the SN direction and NE faults in the mining area. The late stage was late Indosinian. The extrusion of NWW direction resulted in the mineralization of antimony dominated by the NW to the slow dip fault, and the post metallogenic stage fracture activity resulted in the partial fault of the ore body. In order to make the evolution of tectonic stress field consistent with the mineralization, the multiphase activity of the fracture is beneficial to the formation of rich ore bodies, and then points out that the compound part of NE to the main fault and the lateral branch and the intersection of the NE fault and the NW fault is the favorable space for the deep exploration of the rich ore body.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.51

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本文編號(hào)：2170461