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地质论评  2011 

浙江沐尘石英二长岩及其镁铁质包体的锆石UPb年龄和Hf同位素组成――对岩浆混合作用的示踪

Keywords: 镁铁质微粒包体,石英二长岩,锆石UPb年龄,Hf同位素组成,岩浆混合作用,浙江沐尘岩体

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Abstract:

浙江沐尘石英二长岩体中普遍发育形态各异的暗色镁铁质微粒包体。本文运用LA-ICP-MS锆石U-Pb定年技术,对该石英二长岩和其中的暗色镁铁质微粒包体进行了精确的年龄测定,获得的年龄分别为112.1±1.0Ma和112.4±1.2Ma,二者在误差范围内一致,说明它们同时形成,这为指示包体属岩浆混合作用成因提供了关键证据。包体野外多呈塑性形态,包体中可见与寄主岩中相似的钾长石斑晶,包体中的斜长石发育复杂的核边环带结构,并普遍出现针状磷灰石,这些特征也指示包体的形成经历了岩浆混合作用过程。包体与寄主岩样品具有相似的Hf同位素组成,其共同特点主要表现为εHf(t)值散布于正值与负值之间。综合分析表明,沐尘岩体中的暗色镁铁质微粒包体最可能为亏损的地幔组分与其诱发的地壳物质部分熔融形成的长英质岩浆经混合作用的产物。

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