Anatomy of Labrador Sea Heinrich layers
Heinrich layers (H-layers) are distinct, decimetre to centimetre thick layers of ice-rafted debris (IRD) that were deposited in the North Atlantic during the Late and middle Pleistocene. H-layers (H-layers) are characterized by high detrital carbonate and low foraminifera contents. In the Labrador S...
Published in: | Marine Geology |
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Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier Science Bv
2016
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Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00341/45214/44639.pdf https://archimer.ifremer.fr/doc/00341/45214/44640.csv https://archimer.ifremer.fr/doc/00341/45214/44641.pdf https://doi.org/10.1016/j.margeo.2016.05.019 https://archimer.ifremer.fr/doc/00341/45214/ |
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ftarchimer:oai:archimer.ifremer.fr:45214 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Heinrich layers Labrador Sea Ice rafting Sediment lofting Turbidity currents Ice-proximal environments |
spellingShingle |
Heinrich layers Labrador Sea Ice rafting Sediment lofting Turbidity currents Ice-proximal environments Hesse, Reinhard Khodabakhsh, Saeed Anatomy of Labrador Sea Heinrich layers |
topic_facet |
Heinrich layers Labrador Sea Ice rafting Sediment lofting Turbidity currents Ice-proximal environments |
description |
Heinrich layers (H-layers) are distinct, decimetre to centimetre thick layers of ice-rafted debris (IRD) that were deposited in the North Atlantic during the Late and middle Pleistocene. H-layers (H-layers) are characterized by high detrital carbonate and low foraminifera contents. In the Labrador Sea, H-layers reach metre thickness in some proximal core sites near the iceberg source of the Hudson Strait ice stream and show five distinct depositional facies involving sediment lofting and low-density turbidity currents as sediment delivery processes besides ice rafting. Thick massive ice-rafted layers (type I H-layers) occur in the most proximal parts of H-layer 3 and older H-layers. Within 300 km distance from the assumed Hudson Strait ice stream terminus, H-layers somewhat more distal than type I H-layers consist predominantly of stacked thin layers of graded muds containing IRD (type II H-layers). The graded muds that are spiked with IRD resulted from the deposition of fine-grained lofted sediment that collected dropstones and grains under the iceberg route. At greater distance from the Hudson Strait outlet on the slope and rise south of the strait, H-layers on the levees of tributary canyons to the Northwest Atlantic Mid-Ocean Channel (NAMOC) consist of alternations of thin mud turbidites with intercalated laminae of IRD (type III H-layers). On the levees of NAMOC, type IV H-layers consist of layers of IRD alternating with fewer fine-grained spill-over turbidites, because the spill-over frequency from the deep channel was less than that from the less deep canyons on the slope. Type V is made up of bioturbated hemipelagic muds with coarser IRD and occurs in regions between canyons not reached by spill-over turbidity currents and in distal regions of the open ocean or on seamounts. Transport of significant portions of the sediment in H-layers by suspended sediment columns lofted from sand-carrying fresh-water turbidity currents (type II) and by low-density turbidity currents (types III and IV) explains the high percentage of detrital carbonate in the fine (< 63 μm) grain-size fractions (> 80% of the total detrital carbonate of the bulk sediment), which cannot be derived from icebergs alone. It also explains the low magnetic susceptibility and low grey levels on the colour scale compared to H-layers in the North Atlantic east of Greenland. The anomalously great thickness of individual H-layers on the slope and rise off the Hudson Strait as documented in isopach maps reflects the combined effect of the various processes involved in their deposition. Four hypotheses for the origin of H-events are discussed — (i) the binge–purge model, (ii) the subglacial outburst–flow model, (iii) the external forcing model, and (iv) the catastrophic ice-shelf break-up model |
format |
Article in Journal/Newspaper |
author |
Hesse, Reinhard Khodabakhsh, Saeed |
author_facet |
Hesse, Reinhard Khodabakhsh, Saeed |
author_sort |
Hesse, Reinhard |
title |
Anatomy of Labrador Sea Heinrich layers |
title_short |
Anatomy of Labrador Sea Heinrich layers |
title_full |
Anatomy of Labrador Sea Heinrich layers |
title_fullStr |
Anatomy of Labrador Sea Heinrich layers |
title_full_unstemmed |
Anatomy of Labrador Sea Heinrich layers |
title_sort |
anatomy of labrador sea heinrich layers |
publisher |
Elsevier Science Bv |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00341/45214/44639.pdf https://archimer.ifremer.fr/doc/00341/45214/44640.csv https://archimer.ifremer.fr/doc/00341/45214/44641.pdf https://doi.org/10.1016/j.margeo.2016.05.019 https://archimer.ifremer.fr/doc/00341/45214/ |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-52.709,-52.709,58.577,58.577) |
geographic |
Greenland Hudson Hudson Strait Northwest Atlantic Mid-Ocean Channel |
geographic_facet |
Greenland Hudson Hudson Strait Northwest Atlantic Mid-Ocean Channel |
genre |
Greenland Hudson Strait Ice Shelf Labrador Sea North Atlantic Northwest Atlantic Sea ice |
genre_facet |
Greenland Hudson Strait Ice Shelf Labrador Sea North Atlantic Northwest Atlantic Sea ice |
op_source |
Marine Geology (0025-3227) (Elsevier Science Bv), 2016-10 , Vol. 380 , P. 44-66 |
op_relation |
https://archimer.ifremer.fr/doc/00341/45214/44639.pdf https://archimer.ifremer.fr/doc/00341/45214/44640.csv https://archimer.ifremer.fr/doc/00341/45214/44641.pdf doi:10.1016/j.margeo.2016.05.019 https://archimer.ifremer.fr/doc/00341/45214/ |
op_rights |
2016 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.margeo.2016.05.019 |
container_title |
Marine Geology |
container_volume |
380 |
container_start_page |
44 |
op_container_end_page |
66 |
_version_ |
1766020440703107072 |
spelling |
ftarchimer:oai:archimer.ifremer.fr:45214 2023-05-15T16:30:42+02:00 Anatomy of Labrador Sea Heinrich layers Hesse, Reinhard Khodabakhsh, Saeed 2016-10 application/pdf https://archimer.ifremer.fr/doc/00341/45214/44639.pdf https://archimer.ifremer.fr/doc/00341/45214/44640.csv https://archimer.ifremer.fr/doc/00341/45214/44641.pdf https://doi.org/10.1016/j.margeo.2016.05.019 https://archimer.ifremer.fr/doc/00341/45214/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00341/45214/44639.pdf https://archimer.ifremer.fr/doc/00341/45214/44640.csv https://archimer.ifremer.fr/doc/00341/45214/44641.pdf doi:10.1016/j.margeo.2016.05.019 https://archimer.ifremer.fr/doc/00341/45214/ 2016 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use Marine Geology (0025-3227) (Elsevier Science Bv), 2016-10 , Vol. 380 , P. 44-66 Heinrich layers Labrador Sea Ice rafting Sediment lofting Turbidity currents Ice-proximal environments text Publication info:eu-repo/semantics/article 2016 ftarchimer https://doi.org/10.1016/j.margeo.2016.05.019 2021-09-23T20:28:31Z Heinrich layers (H-layers) are distinct, decimetre to centimetre thick layers of ice-rafted debris (IRD) that were deposited in the North Atlantic during the Late and middle Pleistocene. H-layers (H-layers) are characterized by high detrital carbonate and low foraminifera contents. In the Labrador Sea, H-layers reach metre thickness in some proximal core sites near the iceberg source of the Hudson Strait ice stream and show five distinct depositional facies involving sediment lofting and low-density turbidity currents as sediment delivery processes besides ice rafting. Thick massive ice-rafted layers (type I H-layers) occur in the most proximal parts of H-layer 3 and older H-layers. Within 300 km distance from the assumed Hudson Strait ice stream terminus, H-layers somewhat more distal than type I H-layers consist predominantly of stacked thin layers of graded muds containing IRD (type II H-layers). The graded muds that are spiked with IRD resulted from the deposition of fine-grained lofted sediment that collected dropstones and grains under the iceberg route. At greater distance from the Hudson Strait outlet on the slope and rise south of the strait, H-layers on the levees of tributary canyons to the Northwest Atlantic Mid-Ocean Channel (NAMOC) consist of alternations of thin mud turbidites with intercalated laminae of IRD (type III H-layers). On the levees of NAMOC, type IV H-layers consist of layers of IRD alternating with fewer fine-grained spill-over turbidites, because the spill-over frequency from the deep channel was less than that from the less deep canyons on the slope. Type V is made up of bioturbated hemipelagic muds with coarser IRD and occurs in regions between canyons not reached by spill-over turbidity currents and in distal regions of the open ocean or on seamounts. Transport of significant portions of the sediment in H-layers by suspended sediment columns lofted from sand-carrying fresh-water turbidity currents (type II) and by low-density turbidity currents (types III and IV) explains the high percentage of detrital carbonate in the fine (< 63 μm) grain-size fractions (> 80% of the total detrital carbonate of the bulk sediment), which cannot be derived from icebergs alone. It also explains the low magnetic susceptibility and low grey levels on the colour scale compared to H-layers in the North Atlantic east of Greenland. The anomalously great thickness of individual H-layers on the slope and rise off the Hudson Strait as documented in isopach maps reflects the combined effect of the various processes involved in their deposition. Four hypotheses for the origin of H-events are discussed — (i) the binge–purge model, (ii) the subglacial outburst–flow model, (iii) the external forcing model, and (iv) the catastrophic ice-shelf break-up model Article in Journal/Newspaper Greenland Hudson Strait Ice Shelf Labrador Sea North Atlantic Northwest Atlantic Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Northwest Atlantic Mid-Ocean Channel ENVELOPE(-52.709,-52.709,58.577,58.577) Marine Geology 380 44 66 |