Neodymium isotope record of the past 25 Ma in the Indian Ocean
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2008
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| _version_ | 1867171356943056896 |
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| author | Gourlan, Alexandra T Meynadier, Laure M Allègre, Claude J |
| author_facet | Gourlan, Alexandra T Meynadier, Laure M Allègre, Claude J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Changes in ancient oceanic current patterns have been strongly influenced by plate tectonics, particularly by the opening or closing of gateways between different oceans. Such modifications of oceanic circulation have important consequences on climate. We studied the Nd seawater isotopic composition of Indian and Pacific Ocean cores using Nd isotopes, which are good paleo-oceanographic tracers. We focused on the past 25 Ma which are marked by the closure of the Indonesian gateway as well as the Mediterranean connection. We show that a strong westerly oceanic surface current, which we refer to the Miocene Indian Ocean Equatorial Jet (MIOJet), linked the eastern and western Indian Ocean from 14 Ma to 3 Ma and infer that this major change in oceanic circulation probably induced important variations of global climate. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_707046 |
| institution | PANGAEA |
| language | en |
| publishDate | 2008 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Neodymium isotope record of the past 25 Ma in the Indian Ocean Gourlan, Alexandra T Meynadier, Laure M Allègre, Claude J 115-707A; 121-757B; 121-758A; 130-807A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg115; Leg121; Leg130; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean; West equatorial Pacific Ocean Changes in ancient oceanic current patterns have been strongly influenced by plate tectonics, particularly by the opening or closing of gateways between different oceans. Such modifications of oceanic circulation have important consequences on climate. We studied the Nd seawater isotopic composition of Indian and Pacific Ocean cores using Nd isotopes, which are good paleo-oceanographic tracers. We focused on the past 25 Ma which are marked by the closure of the Indonesian gateway as well as the Mediterranean connection. We show that a strong westerly oceanic surface current, which we refer to the Miocene Indian Ocean Equatorial Jet (MIOJet), linked the eastern and western Indian Ocean from 14 Ma to 3 Ma and infer that this major change in oceanic circulation probably induced important variations of global climate. |
| title | Neodymium isotope record of the past 25 Ma in the Indian Ocean |
| topic | 115-707A; 121-757B; 121-758A; 130-807A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg115; Leg121; Leg130; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean; West equatorial Pacific Ocean |
| url | https://doi.org/10.1594/PANGAEA.707046 |