内蒙古希莫勒地区次生晕特征及找矿潜力

    Secondary halo characteristics and prospecting potential of Ximole area in Inner Mongolia

    • 摘要: 希莫勒地区位于铁、金、铜、钛、钴、镍找矿远景区,区内次生晕规模较大、强度较高,并主要分布在新太古界色尔腾山岩群布达尔干组二段混合岩地层区、奥陶系辉长岩体区、辉绿岩脉区和北东向断裂破碎带中,叠加分布有航磁异常。对次生晕分布区元素地球化学参数特征和异常特征进行分析,发现Co、V、Ti呈对数正向偏移分布,均值较高,属极不均匀分异或不均匀分异元素,含量值接近铁矿石伴生组分指标,与Fe可能来自同一物源,可作为主要伴生元素及地球化学指示元素;次生晕元素组合较多,相关性好,具外带、中带特征。部分次生晕经岩石化探剖面粗略查证,发现铁钴矿化体、铁钒矿化体和铁钒钴矿化体,主要分布在辉长岩体和北东向断裂破碎带中,规模较大,与褐铁矿化、磁铁矿化、黄铁矿化、赤铁矿化呈正相关性。希莫勒地区成矿地质和地球化学环境较好,具较大的铁、钴、钒、钛矿成矿潜力。

       

      Abstract: The Ximole area is located in the iron, gold, copper, titanium, cobalt, nickel prospective zone. In this area, secondary ha?los are well developed and have relatively high intensity. They are mainly distributed in migmatite strata of 2nd member of Budaergan Formation in Neo?Archean Seertengshan rock group, Ordovician gabbro bodies, diabase veins and NE?trending faulted shatter zone, with the superimposition of aeromagnetic anomaly. An analysis of the geochemical parameters of elements and anomalies shows that Co, V and Ti exhibit logarithmic positive offset distribution with relatively high mean values and hence belong to elements of extremely une?ven differentiation or uneven differentiation whose content values are close to indices of accompanying components of iron ores, indica?ting that they might have come from the same material source as Fe;therefore, these elements can be regarded as the main accompan?ying elements as well as the geochemical indicator elements. Secondary halo element association is fairly rich with good correlation, and exhibits characteristics of outer zone and middle zone. Rock geochemical profile verification of some secondary halos led to the discovery of Fe?Co mineralized body, Fe?V mineralized body and Fe?V?Co mineralized body, which are fairly large and are mainly distributed in gabbro intrusive body and NE?trending faulted shatter zone, and show direct correlation with lemonitization, magnetitization, pyritiza?tion and hematitization. Ximole area possesses fairly good ore?forming geological and geochemical environment and hence has favorable metallogenic potential for such ore deposits as Fe, Co, V and Ti.

       

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