DOI: 10.1016/j.quascirev.2016.12.008
Scopus记录号: 2-s2.0-85007572177
论文题名: Cosmogenic 10Be and 26Al exposure ages of glaciations in the Frankland Range, southwest Tasmania reveal a limited MIS-2 ice advance
作者: Kiernan K. ; Fink D. ; McConnell A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 157 起始页码: 141
结束页码: 151
语种: 英语
英文关键词: Exposure-age dating
; Glaciation
; MIS-2 ice extent
; Quaternary paleo-climate
; Tasmania
; Topographic influences
Scopus关键词: Erosion
; Flocculation
; Ice
; Exposure age
; Glaciation
; Quaternary paleo-climate
; Tasmania
; Topographic influences
; Glacial geology
英文摘要: New mapping of the glacial geomorphology coupled with 10Be and 26Al exposure age dating of moraines on the flanks of the Frankland Range in south west Tasmania indicate that glacier extent during MIS-2 was far smaller than during earlier glaciations with the ice cover being confined to only the uppermost cirques of the range. Moraines further down the range flanks, ∼50–150 m lower in altitude than the MIS-2 dated advance, indicate that glaciers were only slightly larger during earlier glaciations and, depending on the interpretation of their exposure ages, may range from MIS 7 to MIS 12. These older moraines are nested inside the maximum ice limits of an even more ancient and extensive glaciation, defined by degraded valley floor moraines and coalescing glacio-fluvial fans that remain undated but appear no younger than MIS 12. Patterns of glacial erosion and moraine deposition on the Frankland Range suggest that the more recent glaciations were increasingly influenced by the erosional morphology initiated by earlier glaciers. Microclimatic differences resulting from this earlier glacial topography were particularly influential determinants of glaciation during MIS 2. These results are consistent with emerging evidence from studies of other ranges in southwest Tasmania. © 2016 资助项目: The authors acknowledge AINSE grant 08-037 and ANSTO's Cosmogenic Climate Archives of the Southern Hemisphere (CcASH) Project 0230v which provided support for the exposure age dating.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59323
Appears in Collections: 过去全球变化的重建
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作者单位: 15 Summerleas Road, Fern Tree, Tasmania, Australia; Australian Nuclear Science and Technology Organisation, Menai, NSW, Australia
Recommended Citation:
Kiernan K.,Fink D.,McConnell A.. Cosmogenic 10Be and 26Al exposure ages of glaciations in the Frankland Range, southwest Tasmania reveal a limited MIS-2 ice advance[J]. Quaternary Science Reviews,2017-01-01,157