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矿床地质  2013 

大兴安岭北段岔路口斑岩钼矿床成矿年代学、岩石地球化学及其地质意义

Keywords: 地球化学,Hf同位素,斑岩型钼矿床,岔路口,大兴安岭

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Abstract:

黑龙江省岔路口超大型斑岩钼矿床位于大兴安岭北部,是目前中国东北地区最大的钼矿床,矿体赋存于中酸性杂岩体及侏罗系火山-沉积岩内,其中,晚侏罗世花岗斑岩、石英斑岩、细粒花岗岩与钼矿化关系密切。6件辉钼矿样品的铼-锇等时线年龄为(148±1)Ma。中侏罗世二长花岗岩属钾玄岩系列,w(SiO2)为69.48%~74.98%,w(Al2O3)为12.35%~14.48%,w(K2O+Na2O)为7.67%~10.42%,K2O/Na2O比值介于1.07~2.81。轻、重稀土元素分馏较强,具有较弱的铕负异常,HFSE和LILE分异明显,Rb、K等元素富集,Ta、Nb、P、Ti等元素亏损,显示正εHf(t)值;晚侏罗世花岗斑岩、石英斑岩属钾玄岩系列,而细粒花岗岩属高钾钙碱性系列,w(SiO2)为73.87%~78.95%,w(Al2O3)为10.35%~13.47%,w(K2O+Na2O)为8.06%~10.02%,K2O/Na2O比值介于1.03~8.20。轻、重稀土元素分馏较强,具有明显的铕负异常,HFSE和LILE分异明显,Rb、K、Th等元素富集,P、Ti、Ba、Sr等元素亏损,显示正εHf(t)值。二长花岗岩、花岗斑岩、石英斑岩及细粒花岗岩均为高硅、富碱的高分异I型花岗岩,岩浆源区组成类似,主要来自于新元古代期间亏损地幔增生的年轻下地壳物质。岔路口斑岩钼矿床是晚侏罗世大陆内部构造-岩浆活化的产物,形成于蒙古-鄂霍次克造山带后碰撞伸展环境,同时,可能受到古太平洋板块俯冲诱发的弧后伸展作用的叠加。

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