秭归庙河的第四纪冰川遗迹  

Relics of Quaternary Glaciers of Miaohe in Zigui County

作　　者：魏宝华[1] 肖尚斌[1] 刘咏燕[1] 赵家成[1] 李媛[1] 牛凤霞[1] 王栋[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2009年第4期89-95,共7页Journal of China Three Gorges University：Natural Sciences

摘　　要：描述了秭归庙河一带的冰斗、漂砾、冰川谷及冰水阶地等冰川遗迹,该古冰川的发现有利证实中纬度地区中低山第四纪时冰川运动的存在.为了探讨该地第四纪经冰川作用,从影响冰川形成的机制(降水、温度和雪线高度)出发,通过与庐山地区的气候特征对比,来进一步阐明秭归地区第四纪冰川作用.基于庙河阶地中钙结岩中δ18O的分析,恢复了该地第四纪冰期时的古气温和降雨量,第四纪冰期时温度和降水分别为-3.1^+3.2℃和776~1 155 mm,这种气候背景条件有利于低山冰川作用的形成,总结出庙河第四纪时的冰期.This article aims to describe cirque, boulder, glacial moraine and glacial terraces, and other relics of the ancient glaciers that found; it is beneficial to validate the middle-latitude areas in the mountains there existed glacial motion when the Quaternary period. We explore the glaciation in the Quaternary period from the influencing mechanism of glacial formation （precipitation, temperature and snow-line height） starting , and further clarify the glaciation along Zigui-Miaohe in the Quaternary period with the climate characteristics of Lushan Mountain area contrast. The resumption of the ancient temperature and rainfall based on the calcretes δ^18O of Miaohe terrace analysis, when the temperature and precipitation were --1.8-- ＋4.5 ℃and 876 --1 255 mm which are conducive to the formation of the low mountain glaciation in the Quaternary Ice .Age and sum up the Quaternary Ice Age in Miaohe.

关 键 词：冰川作用 冰川遗迹 第四纪冰川 

分 类 号：P512.4[天文地球—地质学]