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地球学报  2010 

蒙古国查干苏布尔加大型铜-钼矿床地质特征及成因

DOI: 10.3975/cagsb.2010.03.04

Keywords: 查干苏布尔加,斑岩铜钼矿床,埃达克岩,形成时代,成因机理

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Abstract:

查干苏布尔加斑岩铜钼矿床位于西伯利亚板块南缘近东西向和北东向深大断裂所夹持的南蒙古构造岩浆带内,容矿围岩二长花岗斑岩与花岗闪长斑岩主量元素高SiO2(64.69?10?2~73.42?10?2),高Al2O3(15.33?10?2~18.35?10?2),贫MgO(0.13?10?2~0.56?10?2),微量元素Sr二长花岗斑岩略低(144?10?6~175?10?6),花岗闪长斑岩表现为高Sr(样品>300?10?6,476?10?6~720?10?6),二者均低Y(Y<18?10?6,2.21?10?6~10.20?10?6),低Yb(Yb<1.9?10?6,0.30?10?6~1.48?10?6),高Sr/Y(Sr/Y>20,21.8~63.52),稀土元素特征为亏损重稀土,无明显负铕异常,(87Sr/86Sr)i=0.70154~0.70397,(143Nd/144Nd)i=0.512290~0.512600,εNd(t)为+2.4~+8.5,二长花岗斑岩和花岗闪长斑岩均具有埃达克质岩特征,但二长花岗斑岩与花岗闪长斑岩主、微量和稀土元素又存在一定差别,它们可能是岩浆不同演化阶段的产物。通过年龄测定,获得辉钼矿Re-Os等时线年龄为(370.0±5.9)Ma,二长花岗斑岩锆石SHRIMPU-Pb加权平均年龄为(365.7±3.6)Ma,铜钼矿形成时代与二长花岗斑岩形成时代相近,均形成于晚泥盆世。铜钼矿床与二长花岗斑岩、花岗闪长斑岩紧密共生,矿区范围内二长花岗斑岩与花岗闪长斑岩多被蚀变并矿化,表明二长花岗斑岩、花岗闪长斑岩与铜钼矿化存在密切的时空关系,为铜钼成矿提供了主要成矿物质和流体来源。

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