Foraminiferal study of ODP Hole 189-1171
Sequence boundary ages determined in shallow-water sediments obtained from ODP (Ocean Drilling Program) Leg 189 Site 1171 (South Tasman Rise) compare well with other stratigraphic records (New Jersey, United States, and northwestern Europe) and d18O increases from deep-sea records, indicating that s...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.720961 2024-09-15T17:48:05+00:00 Foraminiferal study of ODP Hole 189-1171 Pekar, Stephen F Hucks, Audrey Fuller, Michael D Li, Shawna LATITUDE: -48.499900 * LONGITUDE: 149.111683 * DATE/TIME START: 2000-04-11T00:00:00 * DATE/TIME END: 2000-04-11T00:00:00 2005 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.720961 https://doi.org/10.1594/PANGAEA.720961 en eng PANGAEA Appendix 1 - Species factor scores [dataset]. ftp://rock.geosociety.org/pub/reposit/2005/2005108.pdf https://doi.pangaea.de/10.1594/PANGAEA.720961 https://doi.org/10.1594/PANGAEA.720961 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Pekar, Stephen F; Hucks, Audrey; Fuller, Michael D; Li, Shawna (2005): Glacioeustatic changes in the early and middle Eocene (51-42 Ma): Shallow-water stratigraphy from ODP Leg 189 Site 1171 (South Tasman Rise) and deep-sea d18O records. Geological Society of America Bulletin, 117(7-8), 1081-1093, https://doi.org/10.1130/B25486.1 189-1171 COMPCORE Composite Core Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean dataset publication series 2005 ftpangaea https://doi.org/10.1594/PANGAEA.72096110.1130/B25486.1 2024-07-24T02:31:20Z Sequence boundary ages determined in shallow-water sediments obtained from ODP (Ocean Drilling Program) Leg 189 Site 1171 (South Tasman Rise) compare well with other stratigraphic records (New Jersey, United States, and northwestern Europe) and d18O increases from deep-sea records, indicating that significant (>10 m) eustatic changes occurred during the early to middle Eocene (51-42 Ma). Sequence boundaries were identified and dated using lithology, bio- and magnetostratigraphy, water-depth changes, CaCO3 content, and physical properties (e.g., photospectrometry). They are characterized by a sharp bioturbated surface, low CaCO3 content, and an abrupt increase in glauconite above the surface. Foraminiferal biofacies and planktonic/benthic foraminiferal ratios were used to estimate water-depth changes. Ages of six sequence boundaries (50.9, 49.2, 48.5-47.8, 47.1, 44.5, and 42.6 Ma) from Site 1171 correlate well to the timings of d18O increases and sequence boundaries identified from other Eocene studies. The synchronous nature of sequence boundary development from globally distal sites and d18O increases indicates a global control and that glacioeustasy was operating in this supposedly ice-free world. This is supported by previous modeling studies and atmospheric pCO2 estimates showing that the first time pCO2 levels decreased below a threshold that would support the development of an Antarctic ice sheet occurred at ca. 51 Ma. Estimates of sea-level amplitudes range from ~20 m for the early Eocene (51-49 Ma) and ~25 m to ~45 m for the middle Eocene (48-42 Ma) using constraints established for Oligocene d18O records. Other/Unknown Material Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(149.111683,149.111683,-48.499900,-48.499900) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
189-1171 COMPCORE Composite Core Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean |
spellingShingle |
189-1171 COMPCORE Composite Core Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean Pekar, Stephen F Hucks, Audrey Fuller, Michael D Li, Shawna Foraminiferal study of ODP Hole 189-1171 |
topic_facet |
189-1171 COMPCORE Composite Core Joides Resolution Leg189 Ocean Drilling Program ODP South Pacific Ocean |
description |
Sequence boundary ages determined in shallow-water sediments obtained from ODP (Ocean Drilling Program) Leg 189 Site 1171 (South Tasman Rise) compare well with other stratigraphic records (New Jersey, United States, and northwestern Europe) and d18O increases from deep-sea records, indicating that significant (>10 m) eustatic changes occurred during the early to middle Eocene (51-42 Ma). Sequence boundaries were identified and dated using lithology, bio- and magnetostratigraphy, water-depth changes, CaCO3 content, and physical properties (e.g., photospectrometry). They are characterized by a sharp bioturbated surface, low CaCO3 content, and an abrupt increase in glauconite above the surface. Foraminiferal biofacies and planktonic/benthic foraminiferal ratios were used to estimate water-depth changes. Ages of six sequence boundaries (50.9, 49.2, 48.5-47.8, 47.1, 44.5, and 42.6 Ma) from Site 1171 correlate well to the timings of d18O increases and sequence boundaries identified from other Eocene studies. The synchronous nature of sequence boundary development from globally distal sites and d18O increases indicates a global control and that glacioeustasy was operating in this supposedly ice-free world. This is supported by previous modeling studies and atmospheric pCO2 estimates showing that the first time pCO2 levels decreased below a threshold that would support the development of an Antarctic ice sheet occurred at ca. 51 Ma. Estimates of sea-level amplitudes range from ~20 m for the early Eocene (51-49 Ma) and ~25 m to ~45 m for the middle Eocene (48-42 Ma) using constraints established for Oligocene d18O records. |
format |
Other/Unknown Material |
author |
Pekar, Stephen F Hucks, Audrey Fuller, Michael D Li, Shawna |
author_facet |
Pekar, Stephen F Hucks, Audrey Fuller, Michael D Li, Shawna |
author_sort |
Pekar, Stephen F |
title |
Foraminiferal study of ODP Hole 189-1171 |
title_short |
Foraminiferal study of ODP Hole 189-1171 |
title_full |
Foraminiferal study of ODP Hole 189-1171 |
title_fullStr |
Foraminiferal study of ODP Hole 189-1171 |
title_full_unstemmed |
Foraminiferal study of ODP Hole 189-1171 |
title_sort |
foraminiferal study of odp hole 189-1171 |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.720961 https://doi.org/10.1594/PANGAEA.720961 |
op_coverage |
LATITUDE: -48.499900 * LONGITUDE: 149.111683 * DATE/TIME START: 2000-04-11T00:00:00 * DATE/TIME END: 2000-04-11T00:00:00 |
long_lat |
ENVELOPE(149.111683,149.111683,-48.499900,-48.499900) |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Supplement to: Pekar, Stephen F; Hucks, Audrey; Fuller, Michael D; Li, Shawna (2005): Glacioeustatic changes in the early and middle Eocene (51-42 Ma): Shallow-water stratigraphy from ODP Leg 189 Site 1171 (South Tasman Rise) and deep-sea d18O records. Geological Society of America Bulletin, 117(7-8), 1081-1093, https://doi.org/10.1130/B25486.1 |
op_relation |
Appendix 1 - Species factor scores [dataset]. ftp://rock.geosociety.org/pub/reposit/2005/2005108.pdf https://doi.pangaea.de/10.1594/PANGAEA.720961 https://doi.org/10.1594/PANGAEA.720961 |
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.72096110.1130/B25486.1 |
_version_ |
1810289059233267712 |