本文關(guān)鍵詞： 釩鈦磁鐵礦 成礦規(guī)律 綜合勘查技術(shù) 畢機(jī)溝一帶 漢南雜巖區(qū)　出處：《長(zhǎng)安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：漢南雜巖區(qū)畢機(jī)溝一帶是秦嶺造山帶重要的鐵礦資源基地,該區(qū)帶的找礦工作自二十世紀(jì)五十年代末以來一直進(jìn)行,然而,受找礦思路及工作手段方面的限制,漢南地區(qū)磁鐵礦勘查工作除畢機(jī)溝以外大部分仍停留在地表工作階段,本文利用畢機(jī)溝釩鈦磁鐵礦床作為漢南地區(qū)典型礦床進(jìn)行研究,總結(jié)成礦規(guī)律,提出適用于本區(qū)帶找礦的綜合勘查技術(shù),進(jìn)一步指導(dǎo)左溪地區(qū)找礦工作實(shí)踐。本文的主要研究成果如下:(1)畢機(jī)溝一帶磁鐵礦礦化受巖相控制較為密切,區(qū)內(nèi)磁鐵礦體主要賦存于含鐵高的異剝輝長(zhǎng)巖或角閃輝長(zhǎng)巖中,礦體常集中于韻律層底部,中粒、粗粒各種輝長(zhǎng)巖相互層更迭出現(xiàn)處往往出現(xiàn)較厚礦層,韻律性層狀構(gòu)造、流線構(gòu)造發(fā)育是形成磁鐵礦化的構(gòu)造標(biāo)志;熱液活動(dòng)為礦體后期富集提供熱力學(xué)條件,使含鐵造巖礦物蝕變析出鐵而形成微細(xì)粒磁鐵礦,使磁鐵礦體厚度增大、品位增高,從而達(dá)到了后期改造富集。(2)畢機(jī)溝釩鈦磁鐵礦床的后期熱液改造作用不容忽視,礦床類型應(yīng)為巖漿晚期分異-熱液改造復(fù)合型。(3)畢機(jī)溝一帶尋找磁鐵礦的目標(biāo)巖性與非目標(biāo)巖性之間存在明顯的磁性差異,通過區(qū)內(nèi)畢機(jī)溝釩鈦磁鐵礦床的找礦經(jīng)驗(yàn)研究,認(rèn)為在漢南地區(qū)尋找磁鐵礦床“地質(zhì)填圖+地面高精度磁測(cè)+工程驗(yàn)證”為最佳勘查手段。(4)通過“地質(zhì)填圖+地面高精度磁測(cè)+工程驗(yàn)證”綜合勘查手段在畢機(jī)溝南側(cè)左溪輝長(zhǎng)巖體區(qū)開展地質(zhì)工作,取得較好的效果,發(fā)現(xiàn)數(shù)條具有工業(yè)價(jià)值的磁鐵礦體。
[Abstract]:The Bijiegou area of Hannan complex is an important iron ore resource base in the Qinling orogenic belt. The prospecting work in this zone has been carried out since the end of 1950s. However, it is limited by the ideas and means of ore prospecting. Most of the exploration work of magnetite in Hannan area except Bijigou is still at the surface working stage. In this paper, the Bijigou vanadium titanomagnetite deposit is used as a typical deposit in Hannan area, and the metallogenic regularity is summarized. A comprehensive exploration technique suitable for prospecting in this area is put forward to further guide the prospecting practice in Zuoxi area. The main research results of this paper are as follows: 1) the mineralization of magnetite in Bijiegou area is controlled by lithofacies. The magnetite bodies in this area are mainly located in heteropyroxene or hornblende gabbro with high iron content. The orebodies are usually concentrated at the bottom of the rhythmic layer, and the thicker ore beds are often found in the interbedded areas of various gabbro layers with medium grain and coarse grain. Rhythmic stratified structure and streamline structure are the structural markers of magnetite formation. Hydrothermal activity provides thermodynamic conditions for the late enrichment of orebodies, resulting in the alteration and precipitation of iron from iron-bearing rock-bearing minerals and the formation of microgranular magnetite, which increases the thickness and grade of magnetite bodies. Thus the late hydrothermal transformation of the Bijigou vanadium titanomagnetite deposit can not be ignored. The ore deposit type should be the complex type of late magmatic differentiation and hydrothermal transformation. There is obvious magnetic difference between the target lithology of magnetite and the non-target lithology in Bijiegou area. The ore prospecting experience of Bijigou vanadium titanomagnetite deposit in this area is studied. It is considered that finding magnetite deposit in Hannan area "verification of geological mapping surface high precision magnetic survey engineering" is the best exploration method. Geological work was carried out in the area of Zuoxi gabbro body south of Bijigou by means of "ground high precision magnetic survey engineering verification of geological mapping". Some magnetite bodies with industrial value were found.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.31

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