首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Quartz C-axes and metastable phases in the metamorphic rocks of Almora Nappe: Evidence of Pre-Himalayan signatures
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Quartz C-axes and metastable phases in the metamorphic rocks of Almora Nappe: Evidence of Pre-Himalayan signatures

机译:阿尔莫拉纳普变质岩中的石英C轴和亚稳相:喜马拉雅前特征的证据

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摘要

The alternating sequence of metapelites and metapsammites exposed in the central part of the Almora Nappe is part of the Saryu Formation of the Almora Group(1). These metamorphic rocks have escaped pervasive mylonitization that characterizes the Higher Himalayan Metamorphic Belt(2-4), considered to be root zone of the Almora Nappe. These metamorphics do not show field or petrographic evidence of mylonitization. Lattice preferred orientation of quartz in these rocks suggests that they remained unaffected by shearing during the southward tectonic transport of the nappe from Higher Himalaya to Lesser Himalaya during the Himalayan orogeny. These unmylonitized rocks of Almora Nappe preserve Pre-Himalayan metamorphic signatures.
机译:暴露于阿尔莫拉水母中央部分的变质岩和偏岩层的交替序列是阿尔莫拉组(1)的Saryu组的一部分。这些变质岩逃脱了普遍的mylonitization,这是高喜马拉雅变质带(2-4)的特征,被认为是Almora Nappe的根区。这些变质没有显示野化或岩石学上的髓鞘化证据。这些岩石中石英的晶格偏好取向表明,在喜马拉雅造山运动期间,从南喜马拉雅山脉向小喜马拉雅山脉的尿布向南构造运动期间,它们不受剪切的影响。这些未淀粉化的Almora Nappe岩石保留了喜马拉雅山前的变质特征。

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