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SOME SURFACIAL CHARACTERISTICS OF TILL QUARTZ SAND IN CHINA UNDER ELECTRONIC SCANNING MICROSCOPE

Xie Youyu (Institute of Geography, Academia Sinica) Cui Zhijiu ( Department of Geography, Beijing University )  
The quartz sand from the till and debris flow deposits in the mountains of Kunlun Shan and Southeast Xizang was examined under electronic scanning microscope for its external morphological characteristics. Besides the shell-shaped crack, irregular fault block, joint surface, tilting lamina, "step"system, crushed and deformed joint lamina, and secondary changes were found on the quartz sand grains, round deep pits and striae were also discovered on their surface. The characteristics of form surface of quartz sand from till and from debris flow were analized and discerned. Furthermore, international study of quartz sand with electronic scanning microscope was briefly introduced.
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