DOI: 10.1016/j.quascirev.2013.10.028
Scopus记录号: 2-s2.0-84888065646
论文题名: A 2 million year glacial chronology of the Hatherton Glacier, Antarctica and implications for the size of the East Antarctic Ice Sheet at the last glacial maximum
作者: Joy K. ; Fink D. ; Storey B. ; Atkins C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 83 起始页码: 46
结束页码: 57
语种: 英语
英文关键词: Antarctica
; Cosmogenic 10Be and 26Al exposure dating
; East Antarctic ice sheet
; Hatherton Glacier
; Reduced last glacial maximum ice sheet volume
Scopus关键词: Antarctica
; Cosmogenic
; Cosmogenic exposure
; East antarctic ice sheets
; Glacial chronology
; Glacial deposits
; Ice sheet
; Last Glacial Maximum
; Deposits
; Glaciers
; Glacial geology
; age determination
; aluminum
; beryllium isotope
; cosmogenic radionuclide
; geochronology
; glacial deposit
; glacial history
; Holocene
; ice free corridor
; ice sheet
; Last Glacial Maximum
; Antarctica
; East Antarctica
; Hatherton Glacier
; Transantarctic Mountains
英文摘要: A series of distinct glacial deposits flanking the margins of the upper Hatherton Glacier, an outlet glacier in the central Transantarctic Mountains, are used to constrain the behaviour of the Antarctic ice-sheets. Cosmogenic exposure ages of 18 erratics from four glacial drifts covering the ice free Dubris and Bibra valleys, range in age from 5 to 1997ka. Our results document four glacial advance and retreat events superimposed on an overall long-term ice thickness reduction of about 500m since the mid-Pleistocene. The lack of field evidence and absence of LGM exposure ages in the glacial deposits of the Hatherton Glacier supports our conclusion that at the LGM the East Antarctic Ice Sheet was of similar size, or may have been slightly smaller, than present. Minimum exposure ages from the oldest two glacial events, represented by the Isca and Danum drifts, are ~1-2Ma and ~0.5Ma respectively. The Britannia-II Drift, previously assumed to mark the maximum extent of the Last Glacial Maximum advance, has a mean 10Be age of 126±3.2ka (n=5). Ages from the younger Britannia-I Drift suggest that since the mid-Holocene (6.5±1.2ka, n=5), approximately 200m of additional ice has been lost. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60428
Appears in Collections: 过去全球变化的重建
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作者单位: Gateway Antarctica, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; Institute for Environmental Research, ANSTO, PMB1, Menai 2234, Australia; School of Geography, Environment and Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
Recommended Citation:
Joy K.,Fink D.,Storey B.,et al. A 2 million year glacial chronology of the Hatherton Glacier, Antarctica and implications for the size of the East Antarctic Ice Sheet at the last glacial maximum[J]. Quaternary Science Reviews,2014-01-01,83