KOPRI Repository

Constraining the timing of Holocene glacial retreat in Ny-Alesund, Svalbard using quartz optical dating on sorted circle

Metadata Downloads
Title
Constraining the timing of Holocene glacial retreat in Ny-Alesund, Svalbard using quartz optical dating on sorted circle
Other Titles
원형구조토의 OSL 연대측정을 이용한 스발바드 니알센의 홀로세 빙하후퇴시기 연구
Authors
최정헌
Lee, Jae Il
Yoon, Ho Il
Jacobs Z
Roberts RG
홍성찬
Lim, Hyounsoo
Keywords
OSL dating; climate change; glacial retreat; periglacial; sorted circle
Issue Date
2009
Citation
최정헌, et al. 2009. Constraining the timing of Holocene glacial retreat in Ny-Alesund, Svalbard using quartz optical dating on sorted circle. Physical Research Laboratory, Ahmedabad, India. Physical Research Laboratory, Ahmedabad, India. 2009.11.12~.
Abstract
Establishing chronologies on glacier-related sediments is of importance in many studies on climate change because it can provide direct or indirect clues for understanding the timing of local glacier retreat. In periglacial regions, glacier-related sediments such as moraine deposits sometimes form a distinctive geomorphic structure, called sorted circles, through repeated freeze-thaw cycles on flat areas. This structure has a sorted appearance commonly due to a border of stones surrounding finer materials in the inner part of the circles. In terms of OSL dating, the sorted circles are considered to have tow main advantages over other glacigenic sediments: (1) the sediments that comprise the sorted circles have naturally been well-sorted, thus it is easy to collect samples for OSL dating (i.e. easy to insert sampling tube inside the sediment profile without being bothered by pebble- or cobble-sized clasts), (2) According to the model by Kessler et al. (2001), it is implicitly presumed that some portions of the finer grains above the permafrost layer have been exposed to sunlight for prolonged period of time and their OSL signals are well bleached during the formation of sorted circles. If this is the case, the OSL ages of the well bleached finer grains in the inner part of the sorted circles are expected to indicate the minimum age of last local glacier retreat. In this paper, we investigate the possibility of OSL dating of sorted circles using 19 OSL samples recovered from 6 sorted circles in Ny-Alesund, Svalbard, and discuss the potential of sorted circles as an another time marker for local glacier retreat.
URI
http://repository.kopri.re.kr/handle/201206/7966
Conference Name
Physical Research Laboratory, Ahmedabad, India
Conference Place
Physical Research Laboratory, Ahmedabad, India
Conference Date
2009.11.12~
Files in This Item
There are no files associated with this item.
General Conditions
      ROMEO Green
    Can archive pre-print and post-print or publisher's version/PDF
      ROMEO Blue
    Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
      ROMEO Yellow
    Can archive pre-print (ie pre-refereeing)
      ROMEO White
    Archiving not formally supported

    qrcode

    Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

    Browse