本文選題：釩鈦磁鐵礦床 + 鎂鐵-超鎂鐵巖��； 參考：《中國(guó)地質(zhì)》2017年04期

【摘要】：目前,國(guó)內(nèi)外學(xué)術(shù)界對(duì)賦存于鎂鐵-超鎂鐵雜巖體中的釩鈦磁鐵礦床的成因存在多種不同的解釋,在一定程度上對(duì)這類礦床的資源勘查造成了困惑。因此,闡明鎂鐵-超鎂鐵侵入體中成礦物質(zhì)大規(guī)模聚集的機(jī)理依然是礦床學(xué)界和勘查學(xué)界面臨的重要科學(xué)前緣問(wèn)題。馬達(dá)加斯加中北部Alaotra湖地區(qū)的扎卡巖體是一個(gè)賦存有超大型釩鈦磁鐵礦床的典型鎂鐵質(zhì)層狀侵入體,已探明鐵礦石遠(yuǎn)景資源量8億t(含333),伴生鈦6000萬(wàn)t,伴生釩230萬(wàn)t,為闡明釩鈦磁鐵礦床的成因提供了良好的條件。本文報(bào)道了扎卡巖體的地質(zhì)學(xué)、礦體地質(zhì)學(xué)、巖相學(xué)、礦相學(xué)和巖石地球化學(xué)特征,主要得出以下認(rèn)識(shí):(1)扎卡巖體發(fā)育韻律性火成層理,為一個(gè)典型的鎂鐵質(zhì)層狀巖體,但偉晶巖可構(gòu)成獨(dú)立的侵入單元;(2)礦體主要賦存在層狀巖體中,可劃分為整合型、不整合型和偉晶巖型等3種不同的類型;(3)輝長(zhǎng)巖具有橄欖石→斜長(zhǎng)石→單斜輝石或橄欖石→斜長(zhǎng)石+單斜輝石的結(jié)晶順序,暗示扎卡巖體為一淺成層狀巖體,巖漿侵位深度約3 km;(4)礦石礦物與硅酸鹽礦物呈熱力學(xué)不平衡關(guān)系,且與含水暗色礦物平衡共生,暗示成礦作用發(fā)生在巖漿演化晚期的富含揮發(fā)分環(huán)境;(5)致密塊狀鐵礦石的REE四分組效應(yīng)也表明成礦過(guò)程伴隨著富F、Cl等組分的流體活動(dòng)。據(jù)此,本文提出扎卡巖體中釩鈦磁鐵礦床的形成與透巖漿流體過(guò)程有關(guān)。
[Abstract]:At present, there are many different explanations for the genesis of vanadium titanomagnetite deposit in the magnesite-ultramafic complex, which to some extent cause confusion to the exploration of the mineral resources of this kind of deposit. Therefore, elucidating the mechanism of mass accumulation of ore-forming materials in magnesite-ultramafic intrusions is still an important scientific front problem in ore deposit and exploration fields. The Zaka rock body in Lake Alaotra, central and northern Madagascar, is a typical magnesite layered intrusion with a very large vanadium titanomagnetite deposit. It has been proved that the potential resource amount of iron ore is 800 million tons (containing 333n, 60 million tons of associated titanium and 2.3 million tons of associated vanadium), which provides a good condition for elucidating the genesis of vanadium-titanomagnetite deposit. In this paper, the geological, orebody geology, lithofacies, mineralogy and petrogeochemical characteristics of the Zaka rock mass are reported. The main conclusions are as follows: (1) the rhythmic igneous stratification of the Zaka rock mass is a typical magnesite layered rock mass. However, pegmatite can form an independent intrusive unit, Guanzao 2) orebody mainly occurs in layered rock mass and can be divided into integrated type. There are three different types of gabbro, I. e., irregular type and pegmatite type.) gabbro has the order of crystallization of olivine plagioclase or olivine plagioclase, suggesting that the Zaka rock body is a shallow layered rock mass. The magmatic emplacement depth is about 3 km / m ~ (4) the ore minerals and silicate minerals are thermodynamically disequilibrium and symbiotic with the water-bearing dark minerals. It is suggested that the REE four-group effect of dense block iron ore occurred in the late magmatic evolution of the rich volatile environment, indicating that the ore-forming process was accompanied by fluid activity rich in FCI-rich components. Therefore, the formation of vanadium titanomagnetite deposit in Zaka rock mass is related to the permeable magmatic fluid process.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京);中國(guó)地質(zhì)調(diào)查局沈陽(yáng)地質(zhì)調(diào)查中心;中國(guó)科學(xué)院地質(zhì)與地球物理研究所;
【基金】：中國(guó)地質(zhì)調(diào)查局項(xiàng)目(DD20160104、KE2010D2-3、1212011220921、2009DFA20840)資助~~
【分類號(hào)】：P612

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