Middle to late Miocene (13.7-8.6 Ma) stable isotope stratigraphy and paleoceanography: new insights from West Pacific IODP Site 363-U1490
Fuente:
PANGAEA
Salvato in:
| Autori principali: | , , , , |
|---|---|
| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1867170113656979456 |
|---|---|
| author | Lübbers, Julia Holbourn, Ann E Kuhnt, Wolfgang Kulhanek, Denise K Andersen, Nils |
| author_facet | Lübbers, Julia Holbourn, Ann E Kuhnt, Wolfgang Kulhanek, Denise K Andersen, Nils |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | International Ocean Discovery Program (IODP) Site U1490 in the Western Pacific Warm Pool (05°48.95ʹN, 142°39.27ʹE, 2341 m water depth) provides the opportunity to directly compare an astronomically tuned benthic foraminiferal isotope cyclostratigraphy with biostratigraphic datums and paleomagnetic reversals over the interval 13.7 to 8.6 Ma as well as to reconstruct the evolution of intermediate-deep water masses across the middle to late Miocene Carbonate Crash. The astronomically tuned delta 18O derived ages for magnetochrons identified between 13.6 and 9.3 Ma during IODP Expedition 363 are in good agreement (mean deviation of 17 ±4 kyr) with ages reported in the Geomagnetic Polarity Time Scale of the Geologic Time Scale (GPTS2020), except over the interval 11.7 to 11.0 Ma that is characterized by poorly defined magnetization. The delta 18O based astrochronology at Site U1490 also closely matches that from Ocean Drilling Program (ODP) Site 1146 in the South China Sea and IODP Site U1443 in the equatorial Indian Ocean, allowing evaluation of middle to late Miocene changes of inter-ocean intermediate to deep water delta 13C gradients on orbital timescales. An increase in the delta 13C gradient between Sites 1146 and U1490 from ~12.4 to 10.4 Ma suggests that changes in Pacific Ocean circulation contributed to carbonate depletion during the Carbonate Crash. After 10.5 Ma, a decrease in the meridional delta 13C gradient between Sites U1490 and 1146 indicates spreading of a more uniform central Pacific intermediate-deep water mass, exhibiting similarity to the equatorial Indian Ocean deep water mass at Site U1443. Improved preservation of thin-walled foraminiferal tests and increases in sedimentation rates and coarse fraction percentages mark the recovery of the marine carbonate system and the onset of the Biogenic Bloom after ~9.3 Ma. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_943290 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Middle to late Miocene (13.7-8.6 Ma) stable isotope stratigraphy and paleoceanography: new insights from West Pacific IODP Site 363-U1490 Lübbers, Julia Holbourn, Ann E Kuhnt, Wolfgang Kulhanek, Denise K Andersen, Nils 363-U1490A; 363-U1490B; Age; AGE; Carbonate Crash; CDRILL; Cibicidoides mundulus, δ13C; Cibicidoides mundulus, δ18O; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; Core drilling; Cyclostratigraphy; Depth, composite; Depth, composite revised; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Event label; Exp363; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; Magnetostratigraphy; Mass spectrometer Finnigan MAT 251; middle to late Miocene; ocean circulation; Sample code/label; Sample comment; Sample mass; Stable isotopes; Western Pacific; West Pacific Warm Pool International Ocean Discovery Program (IODP) Site U1490 in the Western Pacific Warm Pool (05°48.95ʹN, 142°39.27ʹE, 2341 m water depth) provides the opportunity to directly compare an astronomically tuned benthic foraminiferal isotope cyclostratigraphy with biostratigraphic datums and paleomagnetic reversals over the interval 13.7 to 8.6 Ma as well as to reconstruct the evolution of intermediate-deep water masses across the middle to late Miocene Carbonate Crash. The astronomically tuned delta 18O derived ages for magnetochrons identified between 13.6 and 9.3 Ma during IODP Expedition 363 are in good agreement (mean deviation of 17 ±4 kyr) with ages reported in the Geomagnetic Polarity Time Scale of the Geologic Time Scale (GPTS2020), except over the interval 11.7 to 11.0 Ma that is characterized by poorly defined magnetization. The delta 18O based astrochronology at Site U1490 also closely matches that from Ocean Drilling Program (ODP) Site 1146 in the South China Sea and IODP Site U1443 in the equatorial Indian Ocean, allowing evaluation of middle to late Miocene changes of inter-ocean intermediate to deep water delta 13C gradients on orbital timescales. An increase in the delta 13C gradient between Sites 1146 and U1490 from ~12.4 to 10.4 Ma suggests that changes in Pacific Ocean circulation contributed to carbonate depletion during the Carbonate Crash. After 10.5 Ma, a decrease in the meridional delta 13C gradient between Sites U1490 and 1146 indicates spreading of a more uniform central Pacific intermediate-deep water mass, exhibiting similarity to the equatorial Indian Ocean deep water mass at Site U1443. Improved preservation of thin-walled foraminiferal tests and increases in sedimentation rates and coarse fraction percentages mark the recovery of the marine carbonate system and the onset of the Biogenic Bloom after ~9.3 Ma. |
| title | Middle to late Miocene (13.7-8.6 Ma) stable isotope stratigraphy and paleoceanography: new insights from West Pacific IODP Site 363-U1490 |
| topic | 363-U1490A; 363-U1490B; Age; AGE; Carbonate Crash; CDRILL; Cibicidoides mundulus, δ13C; Cibicidoides mundulus, δ18O; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; Core drilling; Cyclostratigraphy; Depth, composite; Depth, composite revised; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Event label; Exp363; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Joides Resolution; Magnetostratigraphy; Mass spectrometer Finnigan MAT 251; middle to late Miocene; ocean circulation; Sample code/label; Sample comment; Sample mass; Stable isotopes; Western Pacific; West Pacific Warm Pool |
| url | https://doi.org/10.1594/PANGAEA.943290 |