关键词: 微形态特征, 石英砂, 扫描电镜, 海螺沟冰川

Abstract: The SEM microtextures of glacial sediments samples taken from Hailuogou Glacier are analyzed. The major microtextures are listed as follows: sharp angular features with sharp edges and high relief; large-medium conchoidal fractures, parallel cleavage and terraced fractures, indicating mechanical fragmentation; stria, crescentic gouges and crushed deep hole, indicating abrasion; dissolution pits and grooves, siliceous sphere and clay minerals, indicating chemical dissolution and precipitation. These results indicate that there are intensive erosion processes and chemical dissolution processes under Hailuogou Glacier. The statistical analyses show that the quartz grain SEM microtextures of maritime glacial deposits are different fromthat of fluvial, lacustrine, coastal and eolian deposits, as well as that of continental glacial deposits in Antarctic and inside Tibetan Plateau.

Key words: microtexture, quartz grain, SEM, Hailuogou Glacier