本文選題：成礦成暈 + 找礦應(yīng)用　； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：大興安嶺中南段為典型的草原覆蓋區(qū),且成礦條件優(yōu)越,素有“草原上的小南嶺”之稱。通過對該區(qū)三個典型熱液型鉛鋅銀多金屬礦床(邊家大院、拜仁達(dá)壩、花敖包特)的原生暈地球化學(xué)特征對比分析,探討草原覆蓋區(qū)成礦成暈機(jī)理,為該區(qū)的找礦勘查提供了理論支撐。取得主要成果如下:1、成礦成暈的系統(tǒng)對比分析表明:(1)儲礦構(gòu)造、熱液的性質(zhì)及熱液階段性活動對原生暈的規(guī)模和形態(tài)的影響較大。礦體(脈)和原生暈的形態(tài)及規(guī)模反映出拜仁達(dá)壩礦區(qū)和花敖包特礦區(qū)熱液中成礦物質(zhì)的原始濃度較高,成礦成暈強(qiáng)度較大,而邊家大院礦區(qū)成礦成暈相對弱些;受構(gòu)造產(chǎn)狀的影響,邊家大院礦區(qū)和拜仁達(dá)壩礦區(qū)的原生暈主要發(fā)育于礦體的上盤,而花敖包特礦區(qū)礦體(脈)兩盤原生暈發(fā)育規(guī)模較相當(dāng);含礦熱液階段性沉淀是軸向分帶序列中前緣暈(或尾暈)元素“反向分帶”的主要原因。(2)礦區(qū)賦礦圍巖中成礦元素(Pb、Zn、Ag)的含量、賦礦圍巖鉛同位素與礦石鉛同位素的對比,以及構(gòu)造對礦體的約束等方面的特征表明,賦礦圍巖對成礦物質(zhì)的供應(yīng)微弱。(3)成礦作用過程中,隨著溫度、壓力等物化條件的改變,Ag、Sn等元素賦存礦物的改變是其相關(guān)系數(shù)發(fā)生變化的根本原因。(4)邊家大院礦區(qū)B-B′勘探線和拜仁達(dá)壩西礦區(qū)16號勘探線濃度分帶圖上均反映出原生暈在保存過程中受到后期巖體(脈)的改造。2、原生暈特征研究表明,邊家大院礦區(qū)A-A′勘探線南東方向深部可能隱伏著多階段的礦脈群;B-B′勘探線控制的石英斑巖體為富集Pb、Zn、Ag、Cu、Sn、Mo等元素的地質(zhì)體;拜仁達(dá)壩西礦區(qū)16號勘探線北西方向深部為熱液的源區(qū),深部形成高溫元素(W、Mo、Sn等)礦種的潛力較大。3、以礦區(qū)及區(qū)域地質(zhì)特征為基礎(chǔ),結(jié)合區(qū)域地球化學(xué)異常和礦床(點(diǎn))分布特征,提出了林西地區(qū)(黃崗梁-大井地區(qū))、拜仁達(dá)壩地區(qū),以及花敖包特地區(qū)綜合找礦標(biāo)志。
[Abstract]:The central and southern part of the Daxing'an Mountains is a typical grassland covering area, and the ore-forming conditions are superior, so it is known as "Xiaonanling on the grassland". Based on the comparative analysis of the geochemical characteristics of primary halo in three typical hydrothermal lead-zinc-silver polymetallic deposits (Bian Jia Yuan, Bayern Daba, Hua-ao Bao et al), the mechanism of ore-forming halo in steppe covering area is discussed. It provides theoretical support for prospecting and exploration in this area. The main results are as follows: (1) the ore-storage structure, hydrothermal properties and hydrothermal activities have great influence on the size and morphology of primary halo. The shape and scale of orebody (vein) and primary halo reflect that the original concentration of ore-forming material in hydrothermal solution is higher and the intensity of ore-forming halo is higher in Bayern Daba and Hua-ao Baotte mining areas, but the ore-forming halo is relatively weak in Bian Jia Dayuan mine area. Under the influence of tectonic occurrence, the primary halo in Bian Jia Yuan and Bayern Daba mining area is mainly developed on the upper plate of orebody, while the two primary halos in Huaaobute mine area have the same development scale. The precipitation of mineral-bearing hydrothermal phase is the main reason for the "reverse zoning" of the leading halo (or tail halo) elements in the axial zoning sequence. (2) the content of ore-forming elements (PbPb-Zn ~ (+) Ag) in the host rock of the mining area, and the comparison between the lead isotopes of the ore-bearing surrounding rock and the lead isotope of the ore. The characteristics of structural constraints on orebodies show that the supply of ore-bearing rocks to the ore-forming materials is weak. (3) during the mineralization process, with the temperature, The change of pressure and other physical and chemical conditions is the fundamental reason for the change of correlation coefficient. (4) the concentration zonings of B-B' exploration line in Bian Jia Yuan mining area and exploration line 16 in Bayern Dabaxi mining area are reflected in the concentration zoning diagram. The primary halo was modified by the late rock mass (vein) in the process of preservation. The study on the characteristics of the primary halo shows that, The quartz porphyry controlled by the B-B' exploration line in the south and east direction of the A-A 'exploration line of the Bian Jia Yuan mining area may be a geological body enriched in elements such as PbPbZn, Ag, Cu, Sn, Mo and so on. The depth of No. 16 Prospecting Line NW of Bayern Dabaxi Mining area is the source of hydrothermal solution, and the potential of forming high temperature element (WPMOA Sn, etc.) in the deep part is high. 3, which is based on the geological characteristics of the mining area and the region. Combined with the regional geochemical anomalies and the distribution characteristics of the deposits (points), the comprehensive prospecting criteria for the Linxi area (Huanggangliangliang-Dajing area), Bayern Daba area and Hua-ao Baotte area are put forward.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P632;P612

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