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地质学报  2009 

东秦岭钼矿带内碳酸岩脉型钼(铅)矿床地质地球化学特征、成矿机制及成矿构造背景

, PP. 1968-1984

Keywords: 碳酸岩脉型钼(铅)矿床,稀土和同位素地球化学,ReOs年龄,成矿机制及成矿构造背景,东秦岭钼矿带

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Abstract:

东秦岭钼矿带位于华北板块南缘,NW―NWW向的固始?栾川深断裂带控制着钼矿床的空间分布。黄水庵碳酸岩脉型钼(铅)矿床的确定,为本矿带内已有碳酸岩脉型钼(铅)矿床(黄龙铺地区的大石沟、石家湾和桃园等)增添了又一新成员。本矿带不仅钼金属储量居世界已知单个钼矿带之首,而且碳酸岩脉和花岗斑岩两个成矿体系并存,亦是本区钼矿带的一大特色。业已查明,黄水庵和黄龙铺(大石沟)等碳酸岩脉型钼(铅)矿床的δ??13?C=-5.3‰~-7.0‰,??87?Sr/??86?Sr=0.7049~0.7065。同时,方解石富含轻稀土(LREE/HREE=1.8~2.9)。辉钼矿以富含Re(平均为110×10??-6?~244×10??-6?)为特征。基于含矿碳酸岩脉方解石的Sr、Nd、Pb同位素比值(???87?Sr/???86?Sr对??206?Pb/??204?Pb、??207?Pb/??204?Pb对??206?Pb/??204?Pb和??143?Nd/??144?Nd对??87?Sr/??86?Sr)的关系图,我们初步判断本矿带区域陆壳之下可能存在有EMI(富集地幔Ⅰ),这些含矿碳酸岩脉是源于EMI的碱性硅酸盐碳酸盐熔体溶液结晶分异的产物,成矿金属Mo、Pb主要来自EMI。根据黄水庵和黄龙铺(大石沟)钼(铅)矿床的成矿年龄(ReOs年龄分别为209.5Ma和221Ma),我们推断,碳酸岩脉型钼(铅)矿床形成于华北和扬子两大板块三叠纪碰撞造山后伸展阶段的晚三叠世时期,而在侏罗纪陆内造山晚期的伸展阶段,形成了晚侏罗早白垩世的斑岩型和斑岩矽卡岩型钼矿床(ReOs年龄介于147~116Ma)。

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