Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A
Quantitative radiolarian assemblage analysis has been conducted on middle and upper Eocene sediments (Zones RP16 to RP18) from Ocean Drilling Program Site 1052 in order to establish the radiolarian magnetobiochronology and determine the nature of the faunal turnover across the middle/late Eocene bou...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.811220 2024-05-19T07:44:58+00:00 Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A Kamikuri, Shin-Ichi Wade, Bridget S LATITUDE: 29.951500 * LONGITUDE: -76.626580 * DATE/TIME START: 1997-01-30T15:00:00 * DATE/TIME END: 1997-01-30T15:00:00 2012 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.811220 https://doi.org/10.1594/PANGAEA.811220 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.811220 https://doi.org/10.1594/PANGAEA.811220 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Kamikuri, Shin-Ichi; Wade, Bridget S (2012): Radiolarian magnetobiochronology and faunal turnover across the middle/late Eocene boundary at Ocean Drilling Program Site 1052 in the western North Atlantic Ocean. Marine Micropaleontology, 88-89, 41-53, https://doi.org/10.1016/j.marmicro.2012.03.001 171-1052A Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg171B Ocean Drilling Program ODP Dataset 2012 ftpangaea https://doi.org/10.1594/PANGAEA.81122010.1016/j.marmicro.2012.03.001 2024-04-30T23:34:34Z Quantitative radiolarian assemblage analysis has been conducted on middle and upper Eocene sediments (Zones RP16 to RP18) from Ocean Drilling Program Site 1052 in order to establish the radiolarian magnetobiochronology and determine the nature of the faunal turnover across the middle/late Eocene boundary in the western North Atlantic Ocean. We recognize and calibrate forty-five radiolarian bioevents to the magneto- and cyclo-stratigraphy from Site 1052 to enhance the biochronologic resolution for the middle and late Eocene. Our data is compared to sites in the equatorial Pacific (Leg 199) to access the diachrony of biostratigraphic events. Eleven bioevents are good biostratigraphic markers for tropical/subtropical locations (south of 30°N). The primary markers (lowest occurrences of Cryptocarpium azyx and Calocyclas bandyca) which are tropical zonal boundary markers for Zones RP17 and RP18 provide robust biohorizons for correlation and age determination from the low to middle latitudes and between the Atlantic and Pacific Oceans. Some other radiolarian bioevents are highly diachronous (<1 million years) between oceanic basins. A significant faunal turnover of radiolarians is recognized within Chron C17n.3n (37.7 Ma) where 13 radiolarian species disappear rapidly in less than 100 kyr and 4 new species originate. The radiolarian faunal turnover coincides with a major extinction in planktonic foraminifera. We name the turnover phase, the Middle/Late Eocene Turnover (MLET). Assemblage analysis reveals the MLET to be associated with a decrease in low-mid latitude taxa and increase in cosmopolitan taxa and radiolarian accumulation rates. The MLET might be related to increased biological productivity rather than to surface-water cooling. Dataset North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-76.626580,-76.626580,29.951500,29.951500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
171-1052A Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg171B Ocean Drilling Program ODP |
spellingShingle |
171-1052A Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg171B Ocean Drilling Program ODP Kamikuri, Shin-Ichi Wade, Bridget S Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A |
topic_facet |
171-1052A Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg171B Ocean Drilling Program ODP |
description |
Quantitative radiolarian assemblage analysis has been conducted on middle and upper Eocene sediments (Zones RP16 to RP18) from Ocean Drilling Program Site 1052 in order to establish the radiolarian magnetobiochronology and determine the nature of the faunal turnover across the middle/late Eocene boundary in the western North Atlantic Ocean. We recognize and calibrate forty-five radiolarian bioevents to the magneto- and cyclo-stratigraphy from Site 1052 to enhance the biochronologic resolution for the middle and late Eocene. Our data is compared to sites in the equatorial Pacific (Leg 199) to access the diachrony of biostratigraphic events. Eleven bioevents are good biostratigraphic markers for tropical/subtropical locations (south of 30°N). The primary markers (lowest occurrences of Cryptocarpium azyx and Calocyclas bandyca) which are tropical zonal boundary markers for Zones RP17 and RP18 provide robust biohorizons for correlation and age determination from the low to middle latitudes and between the Atlantic and Pacific Oceans. Some other radiolarian bioevents are highly diachronous (<1 million years) between oceanic basins. A significant faunal turnover of radiolarians is recognized within Chron C17n.3n (37.7 Ma) where 13 radiolarian species disappear rapidly in less than 100 kyr and 4 new species originate. The radiolarian faunal turnover coincides with a major extinction in planktonic foraminifera. We name the turnover phase, the Middle/Late Eocene Turnover (MLET). Assemblage analysis reveals the MLET to be associated with a decrease in low-mid latitude taxa and increase in cosmopolitan taxa and radiolarian accumulation rates. The MLET might be related to increased biological productivity rather than to surface-water cooling. |
format |
Dataset |
author |
Kamikuri, Shin-Ichi Wade, Bridget S |
author_facet |
Kamikuri, Shin-Ichi Wade, Bridget S |
author_sort |
Kamikuri, Shin-Ichi |
title |
Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A |
title_short |
Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A |
title_full |
Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A |
title_fullStr |
Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A |
title_full_unstemmed |
Radiolarian chronology and fauna across the middle/late Eocene boundary at ODP Hole 171-1052A |
title_sort |
radiolarian chronology and fauna across the middle/late eocene boundary at odp hole 171-1052a |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.811220 https://doi.org/10.1594/PANGAEA.811220 |
op_coverage |
LATITUDE: 29.951500 * LONGITUDE: -76.626580 * DATE/TIME START: 1997-01-30T15:00:00 * DATE/TIME END: 1997-01-30T15:00:00 |
long_lat |
ENVELOPE(-76.626580,-76.626580,29.951500,29.951500) |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Kamikuri, Shin-Ichi; Wade, Bridget S (2012): Radiolarian magnetobiochronology and faunal turnover across the middle/late Eocene boundary at Ocean Drilling Program Site 1052 in the western North Atlantic Ocean. Marine Micropaleontology, 88-89, 41-53, https://doi.org/10.1016/j.marmicro.2012.03.001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.811220 https://doi.org/10.1594/PANGAEA.811220 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.81122010.1016/j.marmicro.2012.03.001 |
_version_ |
1799484887528374272 |