DOI: 10.1016/j.quascirev.2015.12.010
Scopus记录号: 2-s2.0-84954128455
论文题名: Luminescence dating of glacial advances at Lago Buenos Aires (~46 °S), Patagonia
作者: Smedley R.K. ; Glasser N.F. ; Duller G.A.T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 134 起始页码: 59
结束页码: 73
语种: 英语
英文关键词: Feldspar
; Geomorphology
; Glacial
; Luminescence
; Patagonia
; Single grains
Scopus关键词: Feldspar
; Geochronology
; Geomorphology
; Luminescence
; Buenos Aires
; Cosmogenic isotopes
; Glacial
; Glacial advances
; Luminescence dating
; Patagonia
; Pro-glacial
; Single grains
; Glacial geology
英文摘要: Understanding the timing of past glacial advances in Patagonia is of global climatic importance because of the insight this can provide into the influence on glacier behaviour of changes in temperature and precipitation related to the Southern Westerlies. In this paper we present new luminescence ages determined using single grains of K-feldspar from proglacial outwash sediments that were deposited by the Patagonian Ice Sheet around Lago Buenos Aires (~46 °S), east of the contemporary Northern Patagonian Icefield. The new luminescence ages indicate that major outwash accumulations formed around ~110 ± 20 ka to 140 ± 20 ka and that these correspond to the Moreno I and II moraine ridges, which were previously dated using cosmogenic isotope dating to 150 ± 30 ka. Luminescence dating at Lago Buenos Aires has also identified outwash sediments that were deposited during glacial advances ~30.8 ± 5.7 ka and ~34.0 ± 6.1 ka (MIS 3) that are not recorded in the moraine record. Younger outwash accumulations were then deposited between ~14.7 ± 2.1 and 26.2 ± 1.6 ka which correspond to the Fenix I - V moraine ridges. The combined chronology suggests that glacial advances occurred ~110 ± 20 ka to 150 ± 30 ka (MIS 6), ~30.8 ± 5.7 ka to ~34.0 ± 6.1 ka (MIS 3), and ~14.7 ± 2.1 to 26.2 ± 1.6 ka (MIS 2) at Lago Buenos Aires. Overall luminescence dating using single grains of K-feldspar has excellent potential to contribute towards the ever-increasing geochronological dataset constraining the timings of glacial advances in Patagonia. © 2015 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59680
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography and Earth Sciences, Aberystwyth University, Ceredigion, United Kingdom
Recommended Citation:
Smedley R.K.,Glasser N.F.,Duller G.A.T.. Luminescence dating of glacial advances at Lago Buenos Aires (~46 °S), Patagonia[J]. Quaternary Science Reviews,2016-01-01,134