地理学报 ›› 1985, Vol. 40 ›› Issue (4): 347-355.doi: 10.11821/xb198504005

• 论文 • 上一篇    下一篇

冀东平原球状石英砂的来源和成因——用扫描电镜研究沉积石英砂微结构组合

高善明   

  1. 中国科学院地理研究所
  • 出版日期:1985-10-15 发布日期:1985-10-15

ORIGIN AND FORMATION OF SPHERICAL QUARTZ SANDS IN JIDONG PLAIN

Gao Shanming   

  1. Institute of Geography, Academia Sinica
  • Online:1985-10-15 Published:1985-10-15

摘要: 石英是一种分布广泛,硬度大的稳定矿物。石英脱离母岩,在不同介质以不同方式搬运和沉积的过程中,塑造一定的外形,表面留下特定的机械成因和化学成因的微结构形痕。

关键词: 球状石, 冀东平原, 滦河冲积扇, 擦痕, 棱状, 碟形, 扫描电镜研究, 贝壳状断口, 石英砂, 微结构

Abstract: Fiue spherical quartz sands with high roundness are widely extended in Jidong Plain. They are carried away to many places compound with sediments from the Luan-he River, but mainly concentrated on the second terrace of Luanhe River in the Yan-shan Mountainous region and the alluvial fan plain of the Late Pleistocene. The largest buried depth is about 180 m.The upper Luanhe River is called as a Shandianhe River. A larger Whenshandak desert on the Xei Mongolia Plateau to north of the river is an origin of spherical sands and quartz grains with surface covered by eoliau dish-shaped pits.The sands in desert are leapt to south by wind force and are transported by Luan-he river and dropped into water. Owing to trasportation in a long distance, abrasion and depositing, the surface of quartz sand has impacted by dense V-shaped pits in a collision.