黑云母向绿泥石转化过程中微观形态及光性特征  

OPTICS AND MICRO-SHAPE CHARACTERS IN THE PROCESS OF BIOTITE TRANSFORMING TO CHLORITE

作　　者：伍英[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《内蒙古石油化工》2009年第10期5-7,共3页Inner Mongolia Petrochemical Industry

基　　金：国家"十五"重大科技攻关项目(2003BA613A)资助

摘　　要：通过偏光显微镜和扫描电子显微镜对砂岩样品的观察,对比研究了黑云母及绿泥石的光学特征及微观形态特征,发现了黑云母向绿泥石蚀变转化过程中光学特征及微观形态特征的变化,有明显波状消光现象。认为通常所见黑云母的波状消光现象可能是由中成岩阶段的矿物交代作用引起的,即叶片状绿泥石交代片状黑云母所致。为砂岩成岩阶段及孔隙演化史划分提供了新的依据。With the polarizing microscope and the scanning electron microscope（SEM）, we observed the sandstone sample, and contrasted optics and micro--shape characters of biotite and chlorite. We found that the biotite, which had been transforming to the chlorite, had some changes of optics and micro-- shape characters, especially its showing wavy extinction under crossed polar. Wavy extinction may be caused by mineral replacement in middle diagenetic stage, or replacement of biotite by chlorite. New evidence was advanced for partition of diagenetic stage and porosity evolution history.

关 键 词：黑云母 绿泥石 波状消光 矿物交代 

分 类 号：TQ633[化学工程—精细化工] P588.121[天文地球—岩石学]