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地质论评  2001 

桐庐杂岩体中共存的两种碱性长石研究

Keywords: 碱性长石透长石正长石共存桐庐杂岩体

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Abstract:

桐庐同熔型火山-侵入杂岩中出现两种碱性长石,一种为无色透明,另一种为微红色,本文利用X射线衍射仪,电子探针,透射电镜对其结构态,成分及出溶微结构进行了对比研究。结果表明,两者成分差别不大,而结构差别较大,无色透明的为透长石,出溶叶片发育;微红色的为正长石或低透长石,出溶结构不发育。而且随着冷却速率的变慢,无色透明碱性长石的Al/Si有序度增大,微红色碱性长石的有序度降低,分析后认为这种共存现象是岩浆混和造成的,从而为桐庐杂岩体的岩浆混合成因提供了有力的证据。

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