North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record
Heinrich events are well documented for the last glaciation, but little is known about their occurrence in older glacial periods of the Pleistocene. Here we report scanning XRF and bulk carbonate d18O results from Integrated Ocean Drilling Program Site U1308 (reoccupation of Deep Sea Drilling Projec...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.831743 2023-05-15T16:35:38+02:00 North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record Hodell, David A Channell, James E T Curtis, Jason H Romero, Oscar E Röhl, Ursula LATITUDE: 49.877760 * LONGITUDE: -24.238110 * DATE/TIME START: 2004-10-30T00:00:00 * DATE/TIME END: 2004-10-30T00:00:00 2008-04-14 application/zip, 10 datasets https://doi.pangaea.de/10.1594/PANGAEA.831743 https://doi.org/10.1594/PANGAEA.831743 en eng PANGAEA Hodell, David A; Channell, James E T; Curtis, Jason H; Romero, Oscar E; Röhl, Ursula (2010): North Atlantic IODP U1308 Middle Pleistocene Heinrich Events Data. NOAA National Centers for Environmental Information, https://doi.org/10.25921/3JTH-D104 https://doi.pangaea.de/10.1594/PANGAEA.831743 https://doi.org/10.1594/PANGAEA.831743 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Hodell, David A; Channell, James E T; Curtis, Jason H; Romero, Oscar E; Röhl, Ursula (2008): Onset of 'Hudson Strait' Heinrich Events in the eastern North Atlantic at the end of the middle Pleistocene transition (~640 ka)? Paleoceanography, 23(4), PA4218, https://doi.org/10.1029/2008PA001591 303-U1308 COMPCORE Composite Core Exp303 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution North Atlantic North Atlantic Climate 1 Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.831743 https://doi.org/10.1029/2008PA001591 https://doi.org/10.25921/3JTH-D104 2023-01-20T07:33:16Z Heinrich events are well documented for the last glaciation, but little is known about their occurrence in older glacial periods of the Pleistocene. Here we report scanning XRF and bulk carbonate d18O results from Integrated Ocean Drilling Program Site U1308 (reoccupation of Deep Sea Drilling Project Site 609) that are used to develop proxy records of ice-rafted detritus (IRD) for the last ~1.4 Ma. Ca/Sr is used as an indicator of IRD layers that are rich in detrital carbonate (i.e., Heinrich layers), whereas Si/Sr reflects layers that are poor in biogenic carbonate and relatively rich in detrital silicate minerals. A pronounced change occurred in the composition and frequency of IRD at ~640 ka during marine isotope stage (MIS) 16, coinciding with the end of the middle Pleistocene transition. At this time, "Hudson Strait" Heinrich layers suddenly appeared in the sedimentary record of Site U1308, and the dominant period of the Si/Sr proxy shifted from 41 ka prior to 640 ka to 100 ka afterward. The onset of Heinrich layers during MIS 16 represents either the initiation of surging of the Laurentide Ice Sheet (LIS) off Hudson Strait or the first time icebergs produced by this process survived the transport to Site U1308. We speculate that ice volume (i.e., thickness) and duration surpassed a critical threshold during MIS 16 and activated the dynamical processes responsible for LIS instability in the region of Hudson Strait. We also observe a strong coupling between IRD proxies and benthic d13C variation at Site U1308 throughout the Pleistocene, supporting a link between iceberg discharge and weakening of thermohaline circulation in the North Atlantic. Dataset Hudson Strait Ice Sheet North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-24.238110,-24.238110,49.877760,49.877760) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
303-U1308 COMPCORE Composite Core Exp303 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution North Atlantic North Atlantic Climate 1 |
spellingShingle |
303-U1308 COMPCORE Composite Core Exp303 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution North Atlantic North Atlantic Climate 1 Hodell, David A Channell, James E T Curtis, Jason H Romero, Oscar E Röhl, Ursula North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record |
topic_facet |
303-U1308 COMPCORE Composite Core Exp303 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution North Atlantic North Atlantic Climate 1 |
description |
Heinrich events are well documented for the last glaciation, but little is known about their occurrence in older glacial periods of the Pleistocene. Here we report scanning XRF and bulk carbonate d18O results from Integrated Ocean Drilling Program Site U1308 (reoccupation of Deep Sea Drilling Project Site 609) that are used to develop proxy records of ice-rafted detritus (IRD) for the last ~1.4 Ma. Ca/Sr is used as an indicator of IRD layers that are rich in detrital carbonate (i.e., Heinrich layers), whereas Si/Sr reflects layers that are poor in biogenic carbonate and relatively rich in detrital silicate minerals. A pronounced change occurred in the composition and frequency of IRD at ~640 ka during marine isotope stage (MIS) 16, coinciding with the end of the middle Pleistocene transition. At this time, "Hudson Strait" Heinrich layers suddenly appeared in the sedimentary record of Site U1308, and the dominant period of the Si/Sr proxy shifted from 41 ka prior to 640 ka to 100 ka afterward. The onset of Heinrich layers during MIS 16 represents either the initiation of surging of the Laurentide Ice Sheet (LIS) off Hudson Strait or the first time icebergs produced by this process survived the transport to Site U1308. We speculate that ice volume (i.e., thickness) and duration surpassed a critical threshold during MIS 16 and activated the dynamical processes responsible for LIS instability in the region of Hudson Strait. We also observe a strong coupling between IRD proxies and benthic d13C variation at Site U1308 throughout the Pleistocene, supporting a link between iceberg discharge and weakening of thermohaline circulation in the North Atlantic. |
format |
Dataset |
author |
Hodell, David A Channell, James E T Curtis, Jason H Romero, Oscar E Röhl, Ursula |
author_facet |
Hodell, David A Channell, James E T Curtis, Jason H Romero, Oscar E Röhl, Ursula |
author_sort |
Hodell, David A |
title |
North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record |
title_short |
North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record |
title_full |
North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record |
title_fullStr |
North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record |
title_full_unstemmed |
North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record |
title_sort |
north atlantic iodp site 303-u1308 middle pleistocene heinrich events record |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.831743 https://doi.org/10.1594/PANGAEA.831743 |
op_coverage |
LATITUDE: 49.877760 * LONGITUDE: -24.238110 * DATE/TIME START: 2004-10-30T00:00:00 * DATE/TIME END: 2004-10-30T00:00:00 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-24.238110,-24.238110,49.877760,49.877760) |
geographic |
Hudson Hudson Strait |
geographic_facet |
Hudson Hudson Strait |
genre |
Hudson Strait Ice Sheet North Atlantic |
genre_facet |
Hudson Strait Ice Sheet North Atlantic |
op_source |
Supplement to: Hodell, David A; Channell, James E T; Curtis, Jason H; Romero, Oscar E; Röhl, Ursula (2008): Onset of 'Hudson Strait' Heinrich Events in the eastern North Atlantic at the end of the middle Pleistocene transition (~640 ka)? Paleoceanography, 23(4), PA4218, https://doi.org/10.1029/2008PA001591 |
op_relation |
Hodell, David A; Channell, James E T; Curtis, Jason H; Romero, Oscar E; Röhl, Ursula (2010): North Atlantic IODP U1308 Middle Pleistocene Heinrich Events Data. NOAA National Centers for Environmental Information, https://doi.org/10.25921/3JTH-D104 https://doi.pangaea.de/10.1594/PANGAEA.831743 https://doi.org/10.1594/PANGAEA.831743 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.831743 https://doi.org/10.1029/2008PA001591 https://doi.org/10.25921/3JTH-D104 |
_version_ |
1766025906171674624 |