Age determination and median grain size of sediment core EN31-PC2
Hemipelagic muds deposited during the past 5.3 cal kyr in the northern Gulf of Mexico (Orca Basin) contain seven intervals punctuated by relatively coarse siliciclastic grain-size peaks, planktonic faunal turnovers, and negative d13C excursions. We believe these episodes represent megaflood deposits...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.856719 2023-05-15T17:53:30+02:00 Age determination and median grain size of sediment core EN31-PC2 Brown, Paul Kennett, James P Ingram, B Lynn LATITUDE: 26.958330 * LONGITUDE: -91.236670 1999-01-08 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.856719 https://doi.org/10.1594/PANGAEA.856719 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.856719 https://doi.org/10.1594/PANGAEA.856719 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Brown, Paul; Kennett, James P; Ingram, B Lynn (1999): Marine evidence for episodic Holocene megafloods in North America and the northern Gulf of Mexico. Paleoceanography, 14(4), 498-510, https://doi.org/10.1029/1999PA900017 EN31-PC2 Endeavor ENXX Orca Basin PC Piston corer Dataset 1999 ftpangaea https://doi.org/10.1594/PANGAEA.856719 https://doi.org/10.1029/1999PA900017 2023-01-20T07:33:39Z Hemipelagic muds deposited during the past 5.3 cal kyr in the northern Gulf of Mexico (Orca Basin) contain seven intervals punctuated by relatively coarse siliciclastic grain-size peaks, planktonic faunal turnovers, and negative d13C excursions. We believe these episodes represent megaflood deposits reflecting historically unprecedented outfall of North American floodwater and terrigenous mud plumes into the gulf, resulting in collapse of the open-ocean pelagic ecosystem. The deposits record multidecadal episodes of high continental precipitation and large Mississippi River floods at ~4.7, 3.5, 3.0, 2.5, 2.0, 1.2, and 0.3 cal ka (500-1200-year recurrence interval). Variations in tropical plankton frequencies define submillenial warming intervals that culminate in these fluvial episodes. Strengthened tropical currents in the gulf at these times appear to have increased sea surface temperatures and associated flow of moist gulf air to the midwest. Terrestrial paleohydrologic records support the marine evidence for millennial-scale changes in recurrence of large midwest flood episodes. Dataset Orca PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-91.236670,-91.236670,26.958330,26.958330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
EN31-PC2 Endeavor ENXX Orca Basin PC Piston corer |
spellingShingle |
EN31-PC2 Endeavor ENXX Orca Basin PC Piston corer Brown, Paul Kennett, James P Ingram, B Lynn Age determination and median grain size of sediment core EN31-PC2 |
topic_facet |
EN31-PC2 Endeavor ENXX Orca Basin PC Piston corer |
description |
Hemipelagic muds deposited during the past 5.3 cal kyr in the northern Gulf of Mexico (Orca Basin) contain seven intervals punctuated by relatively coarse siliciclastic grain-size peaks, planktonic faunal turnovers, and negative d13C excursions. We believe these episodes represent megaflood deposits reflecting historically unprecedented outfall of North American floodwater and terrigenous mud plumes into the gulf, resulting in collapse of the open-ocean pelagic ecosystem. The deposits record multidecadal episodes of high continental precipitation and large Mississippi River floods at ~4.7, 3.5, 3.0, 2.5, 2.0, 1.2, and 0.3 cal ka (500-1200-year recurrence interval). Variations in tropical plankton frequencies define submillenial warming intervals that culminate in these fluvial episodes. Strengthened tropical currents in the gulf at these times appear to have increased sea surface temperatures and associated flow of moist gulf air to the midwest. Terrestrial paleohydrologic records support the marine evidence for millennial-scale changes in recurrence of large midwest flood episodes. |
format |
Dataset |
author |
Brown, Paul Kennett, James P Ingram, B Lynn |
author_facet |
Brown, Paul Kennett, James P Ingram, B Lynn |
author_sort |
Brown, Paul |
title |
Age determination and median grain size of sediment core EN31-PC2 |
title_short |
Age determination and median grain size of sediment core EN31-PC2 |
title_full |
Age determination and median grain size of sediment core EN31-PC2 |
title_fullStr |
Age determination and median grain size of sediment core EN31-PC2 |
title_full_unstemmed |
Age determination and median grain size of sediment core EN31-PC2 |
title_sort |
age determination and median grain size of sediment core en31-pc2 |
publisher |
PANGAEA |
publishDate |
1999 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.856719 https://doi.org/10.1594/PANGAEA.856719 |
op_coverage |
LATITUDE: 26.958330 * LONGITUDE: -91.236670 |
long_lat |
ENVELOPE(-91.236670,-91.236670,26.958330,26.958330) |
genre |
Orca |
genre_facet |
Orca |
op_source |
Supplement to: Brown, Paul; Kennett, James P; Ingram, B Lynn (1999): Marine evidence for episodic Holocene megafloods in North America and the northern Gulf of Mexico. Paleoceanography, 14(4), 498-510, https://doi.org/10.1029/1999PA900017 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.856719 https://doi.org/10.1594/PANGAEA.856719 |
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.856719 https://doi.org/10.1029/1999PA900017 |
_version_ |
1766161204265353216 |