DOI: 10.1016/j.quascirev.2015.11.009
Scopus记录号: 2-s2.0-84948844957
论文题名: A new concept for glacial geological investigations of surges, based on High-Arctic examples (Svalbard)
作者: Lønne I.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 132 起始页码: 74
结束页码: 100
语种: 英语
英文关键词: Classification
; Glacier surge
; Meltwater traces
; Moraines
; Surge morphology
; Svalbard
Scopus关键词: Classification (of information)
; Deformation
; Geology
; Glacial geology
; Mapping
; Deepwater basins
; Field observations
; Geological investigation
; Meltwater traces
; Moraines
; Morphological elements
; Movement history
; Svalbard
; Ice
; classification
; comparative study
; field method
; geological mapping
; glacier surge
; guideline
; ice flow
; landform
; meltwater
; moraine
; proglacial environment
; shallow water
; Arctic
; Arctic
; Fridtjovbreen
; Spitsbergen
; Svalbard
; Svalbard and Jan Mayen
英文摘要: Svalbard is a key area for the investigation of glacial surges, and almost two centuries worth of field observations exists from this region. Studies have shown that the course of a surge and the associated formation of landforms are strongly influenced by basinal factors, and that the broad range of variables involved can hamper interpretations and comparisons. Based on a review of surges in Svalbard, a new concept for glacial geological investigations has been developed that combines ice-flows, ice-front movements, and morphostratigraphy. The concept is comprised of the following four elements: 1) classification based on the configuration and characteristics of the receiving basin, 2) division of the surge cycle into six stages, 3) guidelines for morphological mapping, and 4) use of an allostratigraphic approach for interpreting ice-front movements. In this context, delineation of the active phase is critical, which include the history of terminus movements, and four main categories of receiving basins are recognized. These are (A) terrestrial basins with deformable substrates, (B) terrestrial basins with poorly deformable substrates, (C) shallow water basins, and (D) deep water basins. The ice-front movement history is reconstructed by coupling information from the proglacial moraines (syn-surge), the supraglacial moraines (post-surge), and the associated traces of meltwater to the surge stages (I-VI). This approach has revealed a critical relationship between the termination of the active phase and three morphological elements, namely, the maximum ice-front position, the maximum moraine extent and the youngest proglacial moraine, which are unique for each of the basins A-D. The concept is thus a novel and more precise approach for mapping the active phase and the active phase duration, as shown by the ~12-year long surge of Fridtjovbreen, where stage I was 30 months (inception), stage II was 54 months (ice-front advance), stage III was 12 months (stillstand), and stage IV was 48 months (retreat during active flow). The glacier has been in quiescent phase (stages V/VI) since 2002. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59704
Appears in Collections: 过去全球变化的重建
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Recommended Citation:
Lønne I.. A new concept for glacial geological investigations of surges, based on High-Arctic examples (Svalbard)[J]. Quaternary Science Reviews,2016-01-01,132