Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11
We investigated Oligocene and early Miocene benthic foraminiferal faunas (> 105 µm in size) from Ocean Drilling Program (Leg 199) Site 1218 (4826 m water depth and ~3300 to ~4000 m paleo-water depth) and Site 1219 (5063 m water depth and ~4200 to ~4400 m paleo-water depth) to understand the respo...
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ftdatacite:10.1594/pangaea.775917 2023-05-15T18:26:03+02:00 Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11 Takata, Hiroyuki Nomura, Ritsuo Khim, Boo-Keun 2010 application/zip https://dx.doi.org/10.1594/pangaea.775917 https://doi.pangaea.de/10.1594/PANGAEA.775917 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.palaeo.2010.03.021 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg199 Joides Resolution Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 2010 ftdatacite https://doi.org/10.1594/pangaea.775917 https://doi.org/10.1016/j.palaeo.2010.03.021 2022-02-08T16:24:46Z We investigated Oligocene and early Miocene benthic foraminiferal faunas (> 105 µm in size) from Ocean Drilling Program (Leg 199) Site 1218 (4826 m water depth and ~3300 to ~4000 m paleo-water depth) and Site 1219 (5063 m water depth and ~4200 to ~4400 m paleo-water depth) to understand the response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean. Two principal factor assemblages were recognized. The Factor 1 assemblage (common Nuttallides umbonifer) is related to either an influx of the Southern Component Water (SCW), possibly carbonate undersaturated, or a decrease in seasonality of the food supply from the surface ocean. The Factor 2 assemblage is characterized by typical deep-sea taxa living under variable trophic conditions, possibly with a seasonal component in food supply. The occurrence of abyssal benthic foraminifera faunas during the mid-Oligocene depends on either the effect of SCW or the seasonality of food resources. The Factor 1 assemblage was most common near 76Ol-C11r, 73Ol-C10rn and 67Ol-C9n (ca. 30.2, 29.1 and 26.8 Ma respectively by Pälike et al. (2006, doi:10.1126/science.1133822)). This indicates that the effect of SCW increased or the seasonal input of food from the surface ocean to benthic environments was weakened close to these glacial events. In contrast, the huge export flux of small biogenic carbonate particles close to these glacial events might be responsible for carbonate-rich sediments buffering carbonate undersaturation. Changes in deep-water masses or the periodicity of food supply from the surface ocean and variation in surface carbonate production affected by orbital forcing had an impact on the mid-Oligocene faunas of abyssal benthic foraminifera around the intervals of glacial events in the eastern Equatorial Pacific Ocean. The Factor 1 assemblage decreased sharply at ? 30 Ma (29.8 Ma by Pälike et al. (2006), 30.0 Ma by CK95) and returned to dominance after ? 29 Ma (28.6 Ma by Pälike et al. (2006), 28.8 Ma by CK95). It is likely that the effect of SCW (possibly carbonate undersaturated) has intensified since the late Oligocene. The faunal transition of benthic foraminifera in the eastern Equatorial Pacific Ocean at ~29 Ma might be attributable to the influence of Northern Component Water (NCW) input to the Southern Ocean and the subsequent formation of SCW at about that time. Article in Journal/Newspaper Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Pacific Southern Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg199 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Drilling/drill rig Leg199 Joides Resolution Ocean Drilling Program ODP Takata, Hiroyuki Nomura, Ritsuo Khim, Boo-Keun Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11 |
topic_facet |
Drilling/drill rig Leg199 Joides Resolution Ocean Drilling Program ODP |
description |
We investigated Oligocene and early Miocene benthic foraminiferal faunas (> 105 µm in size) from Ocean Drilling Program (Leg 199) Site 1218 (4826 m water depth and ~3300 to ~4000 m paleo-water depth) and Site 1219 (5063 m water depth and ~4200 to ~4400 m paleo-water depth) to understand the response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean. Two principal factor assemblages were recognized. The Factor 1 assemblage (common Nuttallides umbonifer) is related to either an influx of the Southern Component Water (SCW), possibly carbonate undersaturated, or a decrease in seasonality of the food supply from the surface ocean. The Factor 2 assemblage is characterized by typical deep-sea taxa living under variable trophic conditions, possibly with a seasonal component in food supply. The occurrence of abyssal benthic foraminifera faunas during the mid-Oligocene depends on either the effect of SCW or the seasonality of food resources. The Factor 1 assemblage was most common near 76Ol-C11r, 73Ol-C10rn and 67Ol-C9n (ca. 30.2, 29.1 and 26.8 Ma respectively by Pälike et al. (2006, doi:10.1126/science.1133822)). This indicates that the effect of SCW increased or the seasonal input of food from the surface ocean to benthic environments was weakened close to these glacial events. In contrast, the huge export flux of small biogenic carbonate particles close to these glacial events might be responsible for carbonate-rich sediments buffering carbonate undersaturation. Changes in deep-water masses or the periodicity of food supply from the surface ocean and variation in surface carbonate production affected by orbital forcing had an impact on the mid-Oligocene faunas of abyssal benthic foraminifera around the intervals of glacial events in the eastern Equatorial Pacific Ocean. The Factor 1 assemblage decreased sharply at ? 30 Ma (29.8 Ma by Pälike et al. (2006), 30.0 Ma by CK95) and returned to dominance after ? 29 Ma (28.6 Ma by Pälike et al. (2006), 28.8 Ma by CK95). It is likely that the effect of SCW (possibly carbonate undersaturated) has intensified since the late Oligocene. The faunal transition of benthic foraminifera in the eastern Equatorial Pacific Ocean at ~29 Ma might be attributable to the influence of Northern Component Water (NCW) input to the Southern Ocean and the subsequent formation of SCW at about that time. |
format |
Article in Journal/Newspaper |
author |
Takata, Hiroyuki Nomura, Ritsuo Khim, Boo-Keun |
author_facet |
Takata, Hiroyuki Nomura, Ritsuo Khim, Boo-Keun |
author_sort |
Takata, Hiroyuki |
title |
Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11 |
title_short |
Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11 |
title_full |
Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11 |
title_fullStr |
Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11 |
title_full_unstemmed |
Oligocene to early Miocene benthic foraminifera in the eastern Equatorial Pacific, supplement to: Takata, Hiroyuki; Nomura, Ritsuo; Khim, Boo-Keun (2010): Response of abyssal benthic foraminifera to mid-Oligocene glacial events in the eastern Equatorial Pacific Ocean (ODP Leg 199). Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 1-11 |
title_sort |
oligocene to early miocene benthic foraminifera in the eastern equatorial pacific, supplement to: takata, hiroyuki; nomura, ritsuo; khim, boo-keun (2010): response of abyssal benthic foraminifera to mid-oligocene glacial events in the eastern equatorial pacific ocean (odp leg 199). palaeogeography, palaeoclimatology, palaeoecology, 292(1-2), 1-11 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2010 |
url |
https://dx.doi.org/10.1594/pangaea.775917 https://doi.pangaea.de/10.1594/PANGAEA.775917 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://dx.doi.org/10.1016/j.palaeo.2010.03.021 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.775917 https://doi.org/10.1016/j.palaeo.2010.03.021 |
_version_ |
1766207878244335616 |