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요약정보
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
Resource Type
Academic Journal
Authors
刘小汉
;
韦利杰
;
黄费新
;
方爱民
;
琚宜太
;
李潇丽
;
周学君
;
Liu Xiaohan
;
Wei Lijie
;
Huang Feixin
;
Fang Aimin
;
Ju Yitai
;
Li Xiaoli
;
Zhou Xuejun
Source
地质科学 / Chinese Journal of Geology
. 48(2):419-434
Subject
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
Language
Chinese
ISSN
0563-5020
Online Access
Scopus
Find it @ DONGA
초록
笔者近年对东南极内陆格罗夫山(Grove Mountains)开展了上新世以来冰盖表面波动的综合研究,运用冰川地质、地貌、土壤、沉积岩、孢粉组合及宇宙核素等各种方法手段,提出东南极大冰盖形成以后并非稳定演化至今,而在上新世早期时发生过大规模退缩,其前缘至少曾经退缩到格罗夫山地区,距现今冰盖边缘约400 km.之后,冰盖又迅速膨胀,到距今2.3 Ma时,冰面至少超过现今高度约400 m.以后冰面缓慢平稳下降,至1.6 Ma时,东南极冰盖进入第四纪振荡期,但重新上升的冰面再也没有超过现今高度的100 m以上.东南极冰盖大规模消融事件在全球尺度上也有所响应,例如北半球大冰盖形成,青藏高原整体剧烈隆升,塔里木盆地黄土出现等.这类行星尺度的气候变化可能与直布罗陀海峡关闭与地中海盐化事件,巴拿马地峡关闭等大地构造事件有关.
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