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地质论评  2006 

阿尔泰造山带南缘镁铁质-超镁铁质杂岩体的Sr、Nd、O同位素地球化学及其源区特征探讨

Keywords: 镁铁质-超镁铁质杂岩体SrNdO同位素源区阿尔泰造山带

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Abstract:

对阿尔泰造山带南缘喀拉通克和锡泊渡两个杂岩体的Sr―Nd-O同位素研究表明,两个杂岩体的同位素特征相似,均具有低的(^87Sr/^86Sr),和高的εNd(t)值(6.3~9.1),表明其来源于亏损的软流圈地幔,但是其δ^18O值(‰)大多大于6(5.4~10.2),表明有地壳物质的加入。Sr和O同位素表明,这种地壳物质的混入主要是源区的混入。根据Nd同位素模式年龄以及区域构造演化特征,可能是混入有早期俯冲的洋壳(可能是早古生代)的亏损地幔熔融的结果。然而,与锡泊渡杂岩体不同的是,喀拉通克杂岩体局部还经历了上部地壳的混染作用。此外,额尔齐斯深大断裂南北两侧镁铁质-超镁铁质杂岩体源区特征的相似性可能暗示了该断裂可能不是阿尔泰造山带和准噶尔造山带的分界线。

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