本文選題：火山巖型鐵礦　切入點(diǎn)：地質(zhì)背景　出處：《巖石學(xué)報(bào)》2017年02期 　論文類(lèi)型：期刊論文

【摘要】：備戰(zhàn)、敦德、智博、查崗諾爾鐵礦分布于阿吾拉勒火山巖型鐵礦帶東段的大哈拉軍山組火山巖中,各個(gè)礦區(qū)基性、中性和酸性火山巖兼而有之,但所占比例不盡相同。礦區(qū)的火山巖以鉀玄巖系列、高鉀鈣堿性系列、鈣堿性系列巖石為主,也有少量拉斑系列巖石出露。巖石相對(duì)富集輕稀土元素,相對(duì)富集大離子親石元素而虧損Nb、Ta和Ti等高場(chǎng)強(qiáng)元素。顯示出島弧或活動(dòng)陸緣環(huán)境火山巖的固有特征。研究認(rèn)為該地區(qū)鐵礦床為礦漿-火山熱液復(fù)合成因型鐵礦床,其形成受巖漿-熱液系統(tǒng)活動(dòng)的制約,具體成礦作用包括氧化物熔離成礦、隱爆-貫入成礦、分離結(jié)晶+巖漿流動(dòng)成礦和熱液交代四種類(lèi)型。礦床的控礦因素與成礦條件包括:(1)活動(dòng)大陸邊緣型火山巖組合與伸展構(gòu)造環(huán)境;(2)基性和中性火山熔漿多次噴溢和堆積部位;(3)含礦母巖漿的強(qiáng)烈分異演化導(dǎo)致氧化物熔離,而分離結(jié)晶和巖漿流動(dòng)則促使富集礦體形成;(4)巖漿熱液對(duì)流循環(huán)并萃取圍巖鐵質(zhì),是形成熱液期礦石的基本機(jī)制;(5)火山機(jī)構(gòu)及其伴生裂隙是含礦巖漿活動(dòng)的有利空間并為成礦物質(zhì)的聚集提供物理化學(xué)條件,是鐵礦體主要控礦因素和賦礦部位。鐵礦床與火山作用關(guān)系極為密切,火山熔漿與火山熱液反復(fù)多次活動(dòng)導(dǎo)致了成礦作用的多期多階段性。
[Abstract]:Prewar, Dunde, Zhibo and Chagannuor iron ore deposits are distributed in the volcanic rocks of the Dahala Junshan formation in the eastern section of the Awulale volcanic rock belt. The basic, neutral and acidic volcanic rocks are present in each mining area. But the proportion of volcanic rocks in the mining area is not the same. The volcanic rocks in the mining area are mainly composed of potash series, high potassium calc-alkaline series, calc-alkaline series rocks and a small amount of porphyry series rocks. The rocks are relatively rich in light rare earth elements. The relative enrichment of large ion lithophile elements and depletion of high field strength elements, such as NB, Ta and Ti, show the inherent characteristics of volcanic rocks in the island arc or active continental margin. It is considered that the iron ore deposit in this area is a magma volcanic hydrothermal complex type iron ore deposit. Its formation is restricted by the magma-hydrothermal system activities. The specific metallogenic processes include oxide fusion mineralization, crypto-explosive interpenetration mineralization, The ore-controlling factors and ore-forming conditions of the deposit include: 1) active continental margin volcanic rock assemblage and extensional tectonic environment, 2) basic and neutral volcanic magma multiple spillage and hydrothermal metasomatism, and 4 types of separation and crystallization magma flow metallogeny and hydrothermal metasomatism. The strong differentiation and evolution of the ore-bearing parent magma lead to the oxide melting, The separation crystallization and magmatic flow promote the enrichment orebody to form the magmatic hydrothermal convection circulation and extract the surrounding rock iron. The volcanic mechanism and its associated fractures are favorable spaces for the magmatic activity of ore bearing minerals and provide physicochemical conditions for the accumulation of ore-forming materials. The ore deposit is the main ore-controlling factor and ore-hosting site of the iron ore body. The ore deposit is closely related to the volcanism, and the repeated repeated activities of the magma and the volcanic hydrothermal fluid lead to the multi-period and multi-stage metallogeny.
【作者單位】： 長(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院;中國(guó)地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心;國(guó)土資源部巖漿作用成礦與找礦重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院廣州地球化學(xué)研究所;新疆地質(zhì)礦產(chǎn)開(kāi)發(fā)局第三地質(zhì)大隊(duì);
【基金】：中央高校基本科研業(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金項(xiàng)目(310827162025) 中國(guó)地質(zhì)調(diào)查局項(xiàng)目(12120114007501、12120113044000) 長(zhǎng)安大學(xué)科技創(chuàng)新團(tuán)隊(duì)資助項(xiàng)目(310827153407)聯(lián)合資助
【分類(lèi)號(hào)】：P618.31

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