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地质通报  2008 

变泥质岩递进部分熔融作用的构造物理学效应

Keywords: 部分熔融,应变分解,混合岩,内华达岩基

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Abstract:

在南内华达岩基中,晚中生代花岗岩的侵位导致表壳岩广泛的变质及部分熔融,形成混合岩杂岩体。对伊萨贝拉湖南羊圈混合岩杂岩体构造的野外观测和应变测量表明:①变泥质混合岩和鹅卵石砾岩记录了类似强度的应变;②变泥质岩发生了递进部分熔融,表现为离羊圈花岗闪长岩岩体的距离越远,部分熔融程度越低;③随部分熔融程度的变化,变泥质岩的应变承载构造也逐渐从混合岩带的弱相承载构造(IWL)往强相承载构造(LBF)过渡;④在同岩浆构造作用中,浅色体的流变学性质与鹅卵石砾岩中泥质组分相当,为应变的主要承载体。该结果表明:在高级变质岩区中,部分熔融程度是否足够高及熔体能否形成互相链接的网络,是高级变质岩的流变学强度发生突降、深部岩石发生侧向流动的前提。

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