Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2)
High resolution records from North Atlantic deep-sea sediment have been instrumental in documenting millennial-scale climate variations during the last glacial cycle (Marine Isotope Stages (MIS) 4 to 1) including variations of Ice-Rafted Detritus (IRD) concentrations related to massive iceberg disch...
Main Author: | |
---|---|
Other Authors: | |
Format: | Other/Unknown Material |
Language: | unknown |
Published: |
2021
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.13013/1415 |
id |
ftsalemstateuniv:oai:digitalrepository.salemstate.edu:20.500.13013/1415 |
---|---|
record_format |
openpolar |
spelling |
ftsalemstateuniv:oai:digitalrepository.salemstate.edu:20.500.13013/1415 2023-05-15T17:29:15+02:00 Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2) Surette, Adam Cullen, James L. 2021-11-24T14:05:44.000 https://hdl.handle.net/20.500.13013/1415 unknown researchday/2020/undergradposters/39 http://hdl.handle.net/20.500.13013/1415 Sediment Geology Sediment Core Heinrich event North Atlantic Glacial event 2021 ftsalemstateuniv https://doi.org/20.500.13013/1415 2022-09-22T17:26:31Z High resolution records from North Atlantic deep-sea sediment have been instrumental in documenting millennial-scale climate variations during the last glacial cycle (Marine Isotope Stages (MIS) 4 to 1) including variations of Ice-Rafted Detritus (IRD) concentrations related to massive iceberg discharges from glacial continental ice sheets. We have sampled core VM28-89, located within the Ruddiman IRD Belt in the central North Atlantic at 1 cm intervals and produced detailed records of %IRD ((number of lithic grains >150μm / (number of lithic grains >150μm + number of Planktic foraminifers >150μm)) x 100); lithic grains, >150μm per gram of sediment (lithics/gram); planktic foraminifers, >150μm per gram of sediment (forams/gram), and % coarse fraction for the top 1.20 m. The %IRD reveals two relatively long intervals of >90% IRD and very low forams/gram between 42-71 cm and 91-113 cm separated by intervals of very low (10-25%) IRD and higher forams/gram. Lithics/gram exhibits much higher frequency fluctuations during these same intervals reaching upwards of 6,000 lithics/gram in the upper long interval and up to 12,000 lithics/gram in the deeper long interval. Unlike IRD records from farther to the northeast (ODP Site 980 for example), %IRD and lithics/gram show a distinct lack of correlation at higher values. This decoupling is likely due to the effects of significant changes in the input foraminifer shells in the high %IRD intervals. Our records bear a remarkable resemblance to those from a well-dated core to the west, V23-14 (Hemming & Hajdas, 2003), particularly in %IRD. Tentative correlations of our results to the V23-14 chronostratigraphic framework suggests that our two intervals of very high %IRD correspond to Heinrich Events H2 and H4. The two peaks in %IRD in V23-14 identified as Heinrich Events H1 and H3 are more difficult to identify using our IRD results from VM28-89. Other/Unknown Material North Atlantic Salem State University: Digital Commons |
institution |
Open Polar |
collection |
Salem State University: Digital Commons |
op_collection_id |
ftsalemstateuniv |
language |
unknown |
topic |
Sediment Geology Sediment Core Heinrich event North Atlantic Glacial |
spellingShingle |
Sediment Geology Sediment Core Heinrich event North Atlantic Glacial Surette, Adam Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2) |
topic_facet |
Sediment Geology Sediment Core Heinrich event North Atlantic Glacial |
description |
High resolution records from North Atlantic deep-sea sediment have been instrumental in documenting millennial-scale climate variations during the last glacial cycle (Marine Isotope Stages (MIS) 4 to 1) including variations of Ice-Rafted Detritus (IRD) concentrations related to massive iceberg discharges from glacial continental ice sheets. We have sampled core VM28-89, located within the Ruddiman IRD Belt in the central North Atlantic at 1 cm intervals and produced detailed records of %IRD ((number of lithic grains >150μm / (number of lithic grains >150μm + number of Planktic foraminifers >150μm)) x 100); lithic grains, >150μm per gram of sediment (lithics/gram); planktic foraminifers, >150μm per gram of sediment (forams/gram), and % coarse fraction for the top 1.20 m. The %IRD reveals two relatively long intervals of >90% IRD and very low forams/gram between 42-71 cm and 91-113 cm separated by intervals of very low (10-25%) IRD and higher forams/gram. Lithics/gram exhibits much higher frequency fluctuations during these same intervals reaching upwards of 6,000 lithics/gram in the upper long interval and up to 12,000 lithics/gram in the deeper long interval. Unlike IRD records from farther to the northeast (ODP Site 980 for example), %IRD and lithics/gram show a distinct lack of correlation at higher values. This decoupling is likely due to the effects of significant changes in the input foraminifer shells in the high %IRD intervals. Our records bear a remarkable resemblance to those from a well-dated core to the west, V23-14 (Hemming & Hajdas, 2003), particularly in %IRD. Tentative correlations of our results to the V23-14 chronostratigraphic framework suggests that our two intervals of very high %IRD correspond to Heinrich Events H2 and H4. The two peaks in %IRD in V23-14 identified as Heinrich Events H1 and H3 are more difficult to identify using our IRD results from VM28-89. |
author2 |
Cullen, James L. |
format |
Other/Unknown Material |
author |
Surette, Adam |
author_facet |
Surette, Adam |
author_sort |
Surette, Adam |
title |
Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2) |
title_short |
Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2) |
title_full |
Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2) |
title_fullStr |
Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2) |
title_full_unstemmed |
Detailed Records Of IRD Input From Central North Atlantic Sediment Core VM28-89 During The Last Glacial Cycle (Marine Isotope Stages 4-2) |
title_sort |
detailed records of ird input from central north atlantic sediment core vm28-89 during the last glacial cycle (marine isotope stages 4-2) |
publishDate |
2021 |
url |
https://hdl.handle.net/20.500.13013/1415 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
researchday/2020/undergradposters/39 http://hdl.handle.net/20.500.13013/1415 |
op_doi |
https://doi.org/20.500.13013/1415 |
_version_ |
1766122905504055296 |