摘要
倒石堆是高山岩壁下广泛发育的岩屑堆积型坡地地貌,是理解“盆—山”地貌格局下沉积物转移的关键区域,同时也蕴含区域岩石风化速率和气候变化的丰富信息。基于国内外高山冰缘区倒石堆地貌的研究,对其发育环境、类型与形态、沉积结构及其移动与速率特征进行了梳理总结。认为掌握倒石堆地貌演化信息的关键在于准确判断其形态特征和沉积过程,而获取倒石堆沉积速率的核心则是利用先进技术获取其体积与年代等关键信息,才能确定区域高山岩壁风化速率信息并反演区域古气候变化。未来我国干燥剥蚀山地倒石堆地貌的研究工作须借助现代技术手段对其类型与分布、沉积结构与演化以及年代学等方面开展系统深入的研究,才能为确定区域山体风化速率的时空变化特征以及反演区域乃至亚洲古气候变化提供关键证据。
Talus slopes are widely developed hillslope landforms accumulated by debris at the foot of escarpments.As the key area for understanding the alpine sediment cascade in basin-mountain systems,talus slopes contain abundant information on regional rock weathering rates and climate change.Based on geomorphological research of talus slopes in alpine periglacial areas worldwide,we summarized the developmental environment,geomorphic types,morphological characteristics,and sedimentary structures and rates.The key to understanding the geomorphological evolution of talus slopes lies in accurately judging their morphological characteristics and sedimentary processes.The deposition rate of talus slopes obtained by measuring key factors such as its thickness and volume using advanced technology allows to ascertain the weathering rate of regional alpine escarpments and deduce the evidence of regional paleoclimate changes.Future research on talus slopes in the dry denudated mountains in China needs to be conducted systematically and thoroughly with modern technology in terms of their type and distribution,sedimentary structure and evolution,and chronology to provide key evidence for determining the temporal and spatial variation characteristics of regional mountain weathering rates and paleoclimate changes in Asia.
作者
陈国祥
董治宝
梁爱民
石唯康
刘小槺
南维鸽
白子怡
池政
CHEN Guoxiang;DONG Zhibao;LIANG Aimin;SHI Weikang;LIU Xiaokang;NAN Weige;BAI Ziyi;CHI Zheng(School of Geography and Tourism,Shaanxi Normal University,Xi’an 710119,China)
出处
《地球科学进展》
CAS
CSCD
北大核心
2022年第8期786-797,共12页
Advances in Earth Science
基金
国家自然科学基金重点项目“塔里木盆地周围干燥剥蚀山地风化速率研究”(编号:41930641)
中央高校基本科研业务费专项资金“中国北方毛乌素沙地地表沉积物特征及其物源研究”(编号:2019TS012)资助
关键词
倒石堆地貌
风化速率
古气候演变
Talus slopes
Weathering rate
Paleoclimatic evolution
