Late Weichselian deglaciation and sea level history of St Jonsfjorden, Spitsbergen

a contribution to ice sheet reconstruction

D J A Evans, B R Rea

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The elevation and age of surveyed shorelines in St Jonsfjorden, western Spitsbergen, provide a chronology for Late Weichselian deglaciation and a proxy for former ice thickness. Support is provided for previous reports of two sets of shorelines on NW Spitsbergen, the oldest (at 60 m in St Jonsfjorden) dating to a pre-late Weichselian glaciation and the youngest documenting postglacial rebound. The remarkable survival of the older shorelines suggests that a large area of NW Spitsbergen was either covered by protective, cold-based ice or was subject to only local glaciation during the late Weichselian even though glacier ice extended to the shelf edge ill the Isfjorden Trough. A marine limit of 46 m at the mouth of St Jonsfjorden is compatible with the regional late Weichselian marine limit (LWML) dated to similar to 13 ka BP. A partial relative sea level curve and equidistant shoreline diagram are produced for St Jonsfjorden and used in conjunction with relative sea level curves based on data from previous studies to produce an isobase map for 9 ka BP. The curves indicate that western sites were subject to initial slow emergence followed by rapid emergence between 10 ka and 8.2 ka BP, trends characteristic of areas affected by a full glacial sea or at least subject to early break up of a thin or discontinuous glacier ice cover. A step in the 9 ka BP shoreline long profile over the western end of the peninsula separating Isfjorden and van Mijenfjorden suggests that Holocene neotectonics may have produced anomalously high rebound rates in that area.

Original languageEnglish
Pages (from-to)175-201
Number of pages27
JournalScottish Geographical Journal
Volume121
Issue number2
DOIs
Publication statusPublished - 2005

Keywords

  • last glacial maximum
  • late quaternary glaciation
  • Prins Karls Forland
  • Franz-Josef-Land
  • Barents Sea
  • Ellesmere-Island
  • postglacial emergence
  • Western Svalbard
  • Innuitian Ice
  • Fennoscandian Glaciation

Cite this

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title = "Late Weichselian deglaciation and sea level history of St Jonsfjorden, Spitsbergen: a contribution to ice sheet reconstruction",
abstract = "The elevation and age of surveyed shorelines in St Jonsfjorden, western Spitsbergen, provide a chronology for Late Weichselian deglaciation and a proxy for former ice thickness. Support is provided for previous reports of two sets of shorelines on NW Spitsbergen, the oldest (at 60 m in St Jonsfjorden) dating to a pre-late Weichselian glaciation and the youngest documenting postglacial rebound. The remarkable survival of the older shorelines suggests that a large area of NW Spitsbergen was either covered by protective, cold-based ice or was subject to only local glaciation during the late Weichselian even though glacier ice extended to the shelf edge ill the Isfjorden Trough. A marine limit of 46 m at the mouth of St Jonsfjorden is compatible with the regional late Weichselian marine limit (LWML) dated to similar to 13 ka BP. A partial relative sea level curve and equidistant shoreline diagram are produced for St Jonsfjorden and used in conjunction with relative sea level curves based on data from previous studies to produce an isobase map for 9 ka BP. The curves indicate that western sites were subject to initial slow emergence followed by rapid emergence between 10 ka and 8.2 ka BP, trends characteristic of areas affected by a full glacial sea or at least subject to early break up of a thin or discontinuous glacier ice cover. A step in the 9 ka BP shoreline long profile over the western end of the peninsula separating Isfjorden and van Mijenfjorden suggests that Holocene neotectonics may have produced anomalously high rebound rates in that area.",
keywords = "last glacial maximum, late quaternary glaciation, Prins Karls Forland, Franz-Josef-Land, Barents Sea, Ellesmere-Island, postglacial emergence, Western Svalbard, Innuitian Ice, Fennoscandian Glaciation",
author = "Evans, {D J A} and Rea, {B R}",
year = "2005",
doi = "10.1080/00369220518737230",
language = "English",
volume = "121",
pages = "175--201",
journal = "Scottish Geographical Journal",
issn = "1470-2541",
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TY - JOUR

T1 - Late Weichselian deglaciation and sea level history of St Jonsfjorden, Spitsbergen

T2 - a contribution to ice sheet reconstruction

AU - Evans, D J A

AU - Rea, B R

PY - 2005

Y1 - 2005

N2 - The elevation and age of surveyed shorelines in St Jonsfjorden, western Spitsbergen, provide a chronology for Late Weichselian deglaciation and a proxy for former ice thickness. Support is provided for previous reports of two sets of shorelines on NW Spitsbergen, the oldest (at 60 m in St Jonsfjorden) dating to a pre-late Weichselian glaciation and the youngest documenting postglacial rebound. The remarkable survival of the older shorelines suggests that a large area of NW Spitsbergen was either covered by protective, cold-based ice or was subject to only local glaciation during the late Weichselian even though glacier ice extended to the shelf edge ill the Isfjorden Trough. A marine limit of 46 m at the mouth of St Jonsfjorden is compatible with the regional late Weichselian marine limit (LWML) dated to similar to 13 ka BP. A partial relative sea level curve and equidistant shoreline diagram are produced for St Jonsfjorden and used in conjunction with relative sea level curves based on data from previous studies to produce an isobase map for 9 ka BP. The curves indicate that western sites were subject to initial slow emergence followed by rapid emergence between 10 ka and 8.2 ka BP, trends characteristic of areas affected by a full glacial sea or at least subject to early break up of a thin or discontinuous glacier ice cover. A step in the 9 ka BP shoreline long profile over the western end of the peninsula separating Isfjorden and van Mijenfjorden suggests that Holocene neotectonics may have produced anomalously high rebound rates in that area.

AB - The elevation and age of surveyed shorelines in St Jonsfjorden, western Spitsbergen, provide a chronology for Late Weichselian deglaciation and a proxy for former ice thickness. Support is provided for previous reports of two sets of shorelines on NW Spitsbergen, the oldest (at 60 m in St Jonsfjorden) dating to a pre-late Weichselian glaciation and the youngest documenting postglacial rebound. The remarkable survival of the older shorelines suggests that a large area of NW Spitsbergen was either covered by protective, cold-based ice or was subject to only local glaciation during the late Weichselian even though glacier ice extended to the shelf edge ill the Isfjorden Trough. A marine limit of 46 m at the mouth of St Jonsfjorden is compatible with the regional late Weichselian marine limit (LWML) dated to similar to 13 ka BP. A partial relative sea level curve and equidistant shoreline diagram are produced for St Jonsfjorden and used in conjunction with relative sea level curves based on data from previous studies to produce an isobase map for 9 ka BP. The curves indicate that western sites were subject to initial slow emergence followed by rapid emergence between 10 ka and 8.2 ka BP, trends characteristic of areas affected by a full glacial sea or at least subject to early break up of a thin or discontinuous glacier ice cover. A step in the 9 ka BP shoreline long profile over the western end of the peninsula separating Isfjorden and van Mijenfjorden suggests that Holocene neotectonics may have produced anomalously high rebound rates in that area.

KW - last glacial maximum

KW - late quaternary glaciation

KW - Prins Karls Forland

KW - Franz-Josef-Land

KW - Barents Sea

KW - Ellesmere-Island

KW - postglacial emergence

KW - Western Svalbard

KW - Innuitian Ice

KW - Fennoscandian Glaciation

U2 - 10.1080/00369220518737230

DO - 10.1080/00369220518737230

M3 - Article

VL - 121

SP - 175

EP - 201

JO - Scottish Geographical Journal

JF - Scottish Geographical Journal

SN - 1470-2541

IS - 2

ER -