地质科学2013，Vol.48Issue(2)：419-434,16.DOI:10.3969/j.issn.0563-5020.2013.02.007
东南极冰盖上新世大规模退缩事件
Major collapse event of the East Antarctic Ice Sheet in Pliocene
摘要
Abstract
The multi-disciplinary study of past ice surface elevations in the Grove Mountains of interior East Antarctica provide direct land based data on the behaviour of the East Antarctic Ice Sheet since the Pliocene. The glacial geology,the ages of cold desert soils,the depositional environment of younger moraine sedimentary boulders and their spore pollen assemblages combine to imply a possible significant shrinkage of the ice sheet before the Middle Pliocene Epoch,with the ice sheet margin retreating south of the Grove Mountains( -400 km south from its present coastal position). Exposure age measurements of bedrock indicate that the elevation of the ice surface in the Grove Mountains region subsequently rose at about Mid-Pliocene to at least 400 m higher than today's levels. The ice surface then progressively lowered, with some minor fluctuations. Middle to Late Pleistocene exposure ages found on the lowest samples,at the ice/bedrock contact line, indicate a long period with ice surface elevations was kept at current level or complex fluctuation history during the Quaternary Epoch. Such event of Antarctic ice sheet collapse should correspond with some of huge tectonic events in north hemisphere in global scale,such as the Messinian salinity crisis in the Mediterranean region.关键词
东南极冰盖/格罗夫山/上新世/宇宙成因核素/暴露年龄/动态演化/构造事件Key words
East Antarctica Ice Sheet ( EAIS) , Grove Mountains, Pliocene, Dynamic evolution ,Cosmogenic nuclide element,Exposure age,Tectonic event分类
天文与地球科学引用本文复制引用
刘小汉,韦利杰,黄费新,方爱民,琚宜太,李潇丽,周学君..东南极冰盖上新世大规模退缩事件[J].地质科学,2013,48(2):419-434,16.基金项目
国家"十二五"专项(编号:CHINARE2013-02-02)和国家自然科学基金项目(编号:41272216,41206183)资助. （编号:CHINARE2013-02-02）
