Submicroscopic exsolution lamellae in pyroxenes in the Whin Sill, Northern England
Submicroscopic exsolution lamellae in pyroxenes in the Whin Sill, Northern England
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英格兰北部 Whin Sill 辉石中的亚显微外溶片层
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
V. Strasser
中科院分区：
文献类型：
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作者：
A. C. Dunham;P. Copley;V. Strasser
从思罗克利（诺森伯兰郡）的Whin still白云岩岩芯中得到的光学均匀的鸽岩和辉石，通过电子显微镜显示为未混合的。薄片在窗台边缘的宽度为40 Å，在中心的宽度为3200 Å。均质辉石也有，其成分介于鸽石和辉石之间。未混合颗粒的电子衍射图表明，奥辉岩中含有鸽质片层，鸽质中含有奥辉岩片层。从简单扩散理论的应用来看，片层的大小取决于冷却速度。
Optically homogeneous pigeonites and augites from Whin Sill dolerite cores from Throckley (Northumberland) are shown by electron microscopy to be unmixed. The lamellae are 40 Å wide at the margins of the sill and up to 3200 Å wide at the centre. Homogeneous pyroxenes also occur with a composition intermediate between the pigeonite and augite. Electron diffraction patterns of the unmixed grains show that the augite contains pigeonite lamellae and the pigeonite contains augite lamellae. From the application of simple diffusion theory it is suggested that the size of the lamellae is dependent on the rate of cooling of the sill.