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地质学报  2012 

试论阜平杂岩的深熔作用

, PP. 1491-1502

Keywords: 岩相结构,深熔作用,水致熔融,混合岩化,阜平杂岩

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Abstract:

阜平杂岩中广泛产出浅色脉体,从而显示强烈的混合岩化作用。前人把引起混合岩化作用的机制归因于岩汁交代、重熔或无水深熔作用,似乎与实际的岩相结构不是很一致。矿物自形晶、钠长石净边结构和一些典型的矿物转化反应表明,阜平杂岩的混合岩化作用实际上经历了复杂的过程,主要表现为有水条件下的深熔作用。所形成的熔体有较大的流动性,可迁移一定的距离而进入邻近的岩石,对这些部位而言相当于发生了外来熔体的注入活动,造成熔体注入式混合岩化作用,形成一些交代反应和结构。因此,阜平杂岩混合岩化作用中的变质反应过程既包括长英质矿物的熔融(溶解),还涉及一种含水矿物(如黑云母)转化形成另外一种含水矿物(如角闪石)的化学反应。阜平杂岩的混合岩化作用最重要的机制是水致熔融或含水深熔作用,溶解性重熔或无水深熔作用则较为次要

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