The Late Ordovician glacial sedimentary system of the North Gondwana platform
International audience The Late Ordovician (Hirnantian) glaciation is examined through the North Gondwana record. This domain extended from southern high palaeo-latitudes (southeastern Mauritania, Niger) to northern lower palaeo-latitudes (Morocco, Turkey) and covered a more than 4000 km-wide sectio...
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Format: | Book Part |
Language: | English |
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HAL CCSD
2007
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Online Access: | https://insu.hal.science/insu-02074692 https://insu.hal.science/insu-02074692/document https://insu.hal.science/insu-02074692/file/GhienneEtAl2007_IAS.pdf https://doi.org/10.1002/9781444304435.ch17 |
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ftinsu:oai:HAL:insu-02074692v1 |
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openpolar |
institution |
Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Glacial record Hirnantian North Africa ice stream sequence stratigraphy [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
Glacial record Hirnantian North Africa ice stream sequence stratigraphy [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Ghienne, Jean-François Le Heron, Daniel, Paul Moreau, Julien Denis, Michaël Deynoux, Max The Late Ordovician glacial sedimentary system of the North Gondwana platform |
topic_facet |
Glacial record Hirnantian North Africa ice stream sequence stratigraphy [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The Late Ordovician (Hirnantian) glaciation is examined through the North Gondwana record. This domain extended from southern high palaeo-latitudes (southeastern Mauritania, Niger) to northern lower palaeo-latitudes (Morocco, Turkey) and covered a more than 4000 km-wide section perpendicular to ice-flow lines. A major mid-Hirnantian deglaciation event subdividing the Hirnantian glaciation in two first-order cycles is recognised. As best illustrated by the glacial record in western Libya, each cycle comprises 2-3 glacial phases separated by ice-front retreats several hundreds kilometres to the south. From ice-proximal to ice-distal regions, the number of glacial surfaces differentiates (i) a continental interior with post-glacial reworking of the glacial surfaces), (ii) a glaciated continental shelf that is subdivided into inner (1-2 surfaces), middle (2-5 surfaces) and outer (a single surface related to the glacial maximum) glaciated shelves, and (iii) the non-glaciated shelf. Ice-stream-generated glacial troughs, 50-200 km in width, cross-cut these domains. These troughs are zones of preferential glacial erosion and subsequent sediment accumulation. A glacial deposi-tional sequence, bounded by two glacial erosion surfaces, records one glacial phase. The position either within or outside a glacial trough controls the stratigraphic architecture of a glacial sequence. Glaciomarine outwash diamictites are developed at or near the maximum position of the ice-front. During ice-sheet recession, and in an ice-stream-generated trough, a relatively thin sediment cover blankets the foredeepened erosion surface. An initial rapid ice-sheet withdrawal is inferred. Marine-terminating ice fronts then evolve later into more slowly retreating, land-terminating ice fronts. In adjacent inter-stream areas where a more gradual ice-sheet recession occurred, fluvio-glacial deposits prevailed. The progradation of a delta-shelf system, coeval with fluvial aggradation, that may be locally interrupted by a period ... |
author2 |
Dynamique de la lithosphère et des bassins sédimentaires (IPGS) (IPGS-Dylbas) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS) Ecole et Observatoire des Sciences de la Terre (EOST) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Michael J. Hambrey Poul Christoffersen Neil F. Glasser Bryn Hubbard |
format |
Book Part |
author |
Ghienne, Jean-François Le Heron, Daniel, Paul Moreau, Julien Denis, Michaël Deynoux, Max |
author_facet |
Ghienne, Jean-François Le Heron, Daniel, Paul Moreau, Julien Denis, Michaël Deynoux, Max |
author_sort |
Ghienne, Jean-François |
title |
The Late Ordovician glacial sedimentary system of the North Gondwana platform |
title_short |
The Late Ordovician glacial sedimentary system of the North Gondwana platform |
title_full |
The Late Ordovician glacial sedimentary system of the North Gondwana platform |
title_fullStr |
The Late Ordovician glacial sedimentary system of the North Gondwana platform |
title_full_unstemmed |
The Late Ordovician glacial sedimentary system of the North Gondwana platform |
title_sort |
late ordovician glacial sedimentary system of the north gondwana platform |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://insu.hal.science/insu-02074692 https://insu.hal.science/insu-02074692/document https://insu.hal.science/insu-02074692/file/GhienneEtAl2007_IAS.pdf https://doi.org/10.1002/9781444304435.ch17 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Glacial Sedimentary Processes and Products https://insu.hal.science/insu-02074692 Michael J. Hambrey, Poul Christoffersen, Neil F. Glasser, Bryn Hubbard. Glacial Sedimentary Processes and Products, 39, Wiley, 2007, Special Publication of the International Association of Sedimentologists, 9781405183000. ⟨10.1002/9781444304435.ch17⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/9781444304435.ch17 ISBN: 9781405183000 insu-02074692 https://insu.hal.science/insu-02074692 https://insu.hal.science/insu-02074692/document https://insu.hal.science/insu-02074692/file/GhienneEtAl2007_IAS.pdf doi:10.1002/9781444304435.ch17 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/9781444304435.ch17 |
container_start_page |
295 |
op_container_end_page |
319 |
op_publisher_place |
Oxford, UK |
_version_ |
1787425263070478336 |
spelling |
ftinsu:oai:HAL:insu-02074692v1 2024-01-07T09:43:58+01:00 The Late Ordovician glacial sedimentary system of the North Gondwana platform Ghienne, Jean-François Le Heron, Daniel, Paul Moreau, Julien Denis, Michaël Deynoux, Max Dynamique de la lithosphère et des bassins sédimentaires (IPGS) (IPGS-Dylbas) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS) Ecole et Observatoire des Sciences de la Terre (EOST) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Michael J. Hambrey Poul Christoffersen Neil F. Glasser Bryn Hubbard 2007 https://insu.hal.science/insu-02074692 https://insu.hal.science/insu-02074692/document https://insu.hal.science/insu-02074692/file/GhienneEtAl2007_IAS.pdf https://doi.org/10.1002/9781444304435.ch17 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/9781444304435.ch17 ISBN: 9781405183000 insu-02074692 https://insu.hal.science/insu-02074692 https://insu.hal.science/insu-02074692/document https://insu.hal.science/insu-02074692/file/GhienneEtAl2007_IAS.pdf doi:10.1002/9781444304435.ch17 info:eu-repo/semantics/OpenAccess Glacial Sedimentary Processes and Products https://insu.hal.science/insu-02074692 Michael J. Hambrey, Poul Christoffersen, Neil F. Glasser, Bryn Hubbard. Glacial Sedimentary Processes and Products, 39, Wiley, 2007, Special Publication of the International Association of Sedimentologists, 9781405183000. ⟨10.1002/9781444304435.ch17⟩ Glacial record Hirnantian North Africa ice stream sequence stratigraphy [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/bookPart Book sections 2007 ftinsu https://doi.org/10.1002/9781444304435.ch17 2023-12-13T17:24:38Z International audience The Late Ordovician (Hirnantian) glaciation is examined through the North Gondwana record. This domain extended from southern high palaeo-latitudes (southeastern Mauritania, Niger) to northern lower palaeo-latitudes (Morocco, Turkey) and covered a more than 4000 km-wide section perpendicular to ice-flow lines. A major mid-Hirnantian deglaciation event subdividing the Hirnantian glaciation in two first-order cycles is recognised. As best illustrated by the glacial record in western Libya, each cycle comprises 2-3 glacial phases separated by ice-front retreats several hundreds kilometres to the south. From ice-proximal to ice-distal regions, the number of glacial surfaces differentiates (i) a continental interior with post-glacial reworking of the glacial surfaces), (ii) a glaciated continental shelf that is subdivided into inner (1-2 surfaces), middle (2-5 surfaces) and outer (a single surface related to the glacial maximum) glaciated shelves, and (iii) the non-glaciated shelf. Ice-stream-generated glacial troughs, 50-200 km in width, cross-cut these domains. These troughs are zones of preferential glacial erosion and subsequent sediment accumulation. A glacial deposi-tional sequence, bounded by two glacial erosion surfaces, records one glacial phase. The position either within or outside a glacial trough controls the stratigraphic architecture of a glacial sequence. Glaciomarine outwash diamictites are developed at or near the maximum position of the ice-front. During ice-sheet recession, and in an ice-stream-generated trough, a relatively thin sediment cover blankets the foredeepened erosion surface. An initial rapid ice-sheet withdrawal is inferred. Marine-terminating ice fronts then evolve later into more slowly retreating, land-terminating ice fronts. In adjacent inter-stream areas where a more gradual ice-sheet recession occurred, fluvio-glacial deposits prevailed. The progradation of a delta-shelf system, coeval with fluvial aggradation, that may be locally interrupted by a period ... Book Part Ice Sheet Institut national des sciences de l'Univers: HAL-INSU 295 319 Oxford, UK |