摘要
丽江地区著名的玉龙山存在一个个孤立的“岗丘”,它们全为松散堆积物组成,只部分表面有坚硬的钙质胶结层;根据石英砂表面结构特征以及粒度分析、孢粉分析,表明系冰川环境的产物。堆积物的冰碛物特征排除了这种“岗丘”为老第三纪丽江角砾岩组成的基岩小丘之可能。通过比较,笔者认为该冰碛为比丽江冰期更老的推挤终碛,为该区地理环境的演变提供了证据。
The noted Yulong Mountain in Lijiang area exists some isolated hillocks, which are almost composed of loose accumulated materials except parts of their surfaces with hard calcic cement beds. According to the surface texture features of the quartz sand, size analysis -and sporopollen analysis, the hil-locks are shown to be the products, of the glacial environment. The moraine features of the accumulated materials eliminate the possibility of these hil-locks as bedrock mounds composed of Palaeogene Lijiang breccia. After compa-rison, the writer considers that the moraines are push end moraines whose age is older than Lijiang glacial stage. This conclusion provides evidence for the geographical environment evolution in. this area.
出处
《云南地质》
1992年第1期88-93,共6页
Yunnan Geology
