Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146
One of the most enigmatic features of Cenozoic long-term climate evolution is the long-lasting positive carbon-isotope excursion or “Monterey Excursion”, which started during a period of global warmth after 16.9 Ma and ended at not, vert, similar 13.5 Ma, approximately 400 kyr after major expansion...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.658956 2023-05-15T13:42:09+02:00 Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146 Holbourn, Ann E Kuhnt, Wolfgang Schulz, Michael Flores, José-Abel Andersen, Nils MEDIAN LATITUDE: 1.724842 * MEDIAN LONGITUDE: -160.052583 * SOUTH-BOUND LATITUDE: -16.007017 * WEST-BOUND LONGITUDE: 116.272917 * NORTH-BOUND LATITUDE: 19.456700 * EAST-BOUND LONGITUDE: -76.378083 * DATE/TIME START: 1999-03-21T00:00:00 * DATE/TIME END: 2002-04-26T00:00:00 2007-09-26 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.658956 https://doi.org/10.1594/PANGAEA.658956 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.658956 https://doi.org/10.1594/PANGAEA.658956 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Holbourn, Ann E; Kuhnt, Wolfgang; Schulz, Michael; Flores, José-Abel; Andersen, Nils (2007): Orbitally-paced climate evolution during the middle Miocene “Monterey” carbon-isotope excursion. Earth and Planetary Science Letters, 261(3-4), 534-550, https://doi.org/10.1016/j.epsl.2007.07.026 184-1146 202-1237 COMPCORE Composite Core cyclostratigraphy Joides Resolution Leg184 Leg202 Ocean Drilling Program ODP South China Sea South Pacific Ocean Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.658956 https://doi.org/10.1016/j.epsl.2007.07.026 2023-01-20T07:31:05Z One of the most enigmatic features of Cenozoic long-term climate evolution is the long-lasting positive carbon-isotope excursion or “Monterey Excursion”, which started during a period of global warmth after 16.9 Ma and ended at not, vert, similar 13.5 Ma, approximately 400 kyr after major expansion of the Antarctic ice-sheet. We present high-resolution (1-9 kyr) astronomically-tuned climate proxy records in two complete sedimentary successions from the northwestern and southeastern Pacific (ODP Sites 1146 and 1237), which shed new light on the middle Miocene carbon-isotope excursion and associated climatic transition over the interval 17.1-12.7 Ma. We recognize three distinct climate phases with different imprints of orbital variations into the climatic signals (1146 and 1237 d18O, d13C; 1237 XRF Fe, fraction > 63 µm): (1) climate optimum prior to 14.7 Ma characterized by minimum ice volume and prominent 100 and 400 kyr variability, (2) long-term cooling from 14.7 to 13.9 Ma, principally driven by obliquity and culminating with rapid cryosphere expansion and global cooling at the onset of the last and most pronounced d13C increase, (3) “Icehouse” mode after 13.9 Ma with distinct 100 kyr variability and improved ventilation of the deep Pacific. The “Monterey” carbon-isotope excursion (16.9-13.5 Ma) consists overall of nine 400 kyr cycles, which show high coherence with the long eccentricity period. Superposed on these low-frequency oscillations are high-frequency variations (100 kyr), which closely track the amplitude modulation of the short eccentricity period. In contrast to d13C, the d18O signal additionally shows significant power in the 41 kyr band, and the 1.2 Myr amplitude modulation of the obliquity cycle is clearly imprinted in the 1146 d18O signal. Our results suggest that eccentricity was a prime pacemaker of middle Miocene climate evolution through the modulation of long-term carbon budgets and that obliquity-paced changes in high-latitude seasonality favored the transition into the “Icehouse” ... Dataset Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Pacific ENVELOPE(116.272917,-76.378083,19.456700,-16.007017) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
184-1146 202-1237 COMPCORE Composite Core cyclostratigraphy Joides Resolution Leg184 Leg202 Ocean Drilling Program ODP South China Sea South Pacific Ocean |
spellingShingle |
184-1146 202-1237 COMPCORE Composite Core cyclostratigraphy Joides Resolution Leg184 Leg202 Ocean Drilling Program ODP South China Sea South Pacific Ocean Holbourn, Ann E Kuhnt, Wolfgang Schulz, Michael Flores, José-Abel Andersen, Nils Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146 |
topic_facet |
184-1146 202-1237 COMPCORE Composite Core cyclostratigraphy Joides Resolution Leg184 Leg202 Ocean Drilling Program ODP South China Sea South Pacific Ocean |
description |
One of the most enigmatic features of Cenozoic long-term climate evolution is the long-lasting positive carbon-isotope excursion or “Monterey Excursion”, which started during a period of global warmth after 16.9 Ma and ended at not, vert, similar 13.5 Ma, approximately 400 kyr after major expansion of the Antarctic ice-sheet. We present high-resolution (1-9 kyr) astronomically-tuned climate proxy records in two complete sedimentary successions from the northwestern and southeastern Pacific (ODP Sites 1146 and 1237), which shed new light on the middle Miocene carbon-isotope excursion and associated climatic transition over the interval 17.1-12.7 Ma. We recognize three distinct climate phases with different imprints of orbital variations into the climatic signals (1146 and 1237 d18O, d13C; 1237 XRF Fe, fraction > 63 µm): (1) climate optimum prior to 14.7 Ma characterized by minimum ice volume and prominent 100 and 400 kyr variability, (2) long-term cooling from 14.7 to 13.9 Ma, principally driven by obliquity and culminating with rapid cryosphere expansion and global cooling at the onset of the last and most pronounced d13C increase, (3) “Icehouse” mode after 13.9 Ma with distinct 100 kyr variability and improved ventilation of the deep Pacific. The “Monterey” carbon-isotope excursion (16.9-13.5 Ma) consists overall of nine 400 kyr cycles, which show high coherence with the long eccentricity period. Superposed on these low-frequency oscillations are high-frequency variations (100 kyr), which closely track the amplitude modulation of the short eccentricity period. In contrast to d13C, the d18O signal additionally shows significant power in the 41 kyr band, and the 1.2 Myr amplitude modulation of the obliquity cycle is clearly imprinted in the 1146 d18O signal. Our results suggest that eccentricity was a prime pacemaker of middle Miocene climate evolution through the modulation of long-term carbon budgets and that obliquity-paced changes in high-latitude seasonality favored the transition into the “Icehouse” ... |
format |
Dataset |
author |
Holbourn, Ann E Kuhnt, Wolfgang Schulz, Michael Flores, José-Abel Andersen, Nils |
author_facet |
Holbourn, Ann E Kuhnt, Wolfgang Schulz, Michael Flores, José-Abel Andersen, Nils |
author_sort |
Holbourn, Ann E |
title |
Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146 |
title_short |
Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146 |
title_full |
Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146 |
title_fullStr |
Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146 |
title_full_unstemmed |
Stable isotopes measured on Miocene benthic foraminifera from ODP sites 202-1237 and 184-1146 |
title_sort |
stable isotopes measured on miocene benthic foraminifera from odp sites 202-1237 and 184-1146 |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.658956 https://doi.org/10.1594/PANGAEA.658956 |
op_coverage |
MEDIAN LATITUDE: 1.724842 * MEDIAN LONGITUDE: -160.052583 * SOUTH-BOUND LATITUDE: -16.007017 * WEST-BOUND LONGITUDE: 116.272917 * NORTH-BOUND LATITUDE: 19.456700 * EAST-BOUND LONGITUDE: -76.378083 * DATE/TIME START: 1999-03-21T00:00:00 * DATE/TIME END: 2002-04-26T00:00:00 |
long_lat |
ENVELOPE(116.272917,-76.378083,19.456700,-16.007017) |
geographic |
Antarctic The Antarctic Pacific |
geographic_facet |
Antarctic The Antarctic Pacific |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Supplement to: Holbourn, Ann E; Kuhnt, Wolfgang; Schulz, Michael; Flores, José-Abel; Andersen, Nils (2007): Orbitally-paced climate evolution during the middle Miocene “Monterey” carbon-isotope excursion. Earth and Planetary Science Letters, 261(3-4), 534-550, https://doi.org/10.1016/j.epsl.2007.07.026 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.658956 https://doi.org/10.1594/PANGAEA.658956 |
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.658956 https://doi.org/10.1016/j.epsl.2007.07.026 |
_version_ |
1766163243320999936 |