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Evolution of the zonal gradients across the Equatorial Pacific during the Miocene-Pleistocene

Catherine Beltran, Gabrielle Rousselle, Marc de Rafelis, Marie-Alexandrine Sicre, Nathalie Labourdette and Stefan Schouten
Evolution of the zonal gradients across the Equatorial Pacific during the Miocene-Pleistocene
Journal of Sedimentary Research (March 2019) 89 (3): 242-252

Abstract

Combining - and TEX86-derived temperatures and oxygen isotopic values of mixed-layer and thermocline species from the IODP site U1338 (East Equatorial Pacific) and ODP Site 806 (West Equatorial Pacific) we assess the evolution of the zonal sea-surface temperature gradients and thermocline depth across the equatorial Pacific from the late Miocene through the Pleistocene. Data suggest a long-term shoaling of the thermocline along the equator throughout the Miocene-Pliocene that accelerated around 5.3 Ma. We identify a critical transition at about 3.8 Ma from a El-Nino-like-dominated mean state during the late Miocene and early Pliocene to a La-Nina-like-dominated state during the late Pliocene-Pleistocene. This transition coincides with the restriction of the Indonesian seaway and the onset of ice growth in the northern hemisphere and in Antarctica that led to the long-term strengthening of the Walker circulation and affected low-latitude zonal gradient.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 89
Serial Issue: 3
Title: Evolution of the zonal gradients across the Equatorial Pacific during the Miocene-Pleistocene
Affiliation: Pierre and Marie Curie University, Paris, France
Pages: 242-252
Published: 201903
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 117
Accession Number: 2019-032114
Categories: Isotope geochemistryStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N02°30'28" - N02°30'28", W117°58'11" - W117°58'11"
N00°19'06" - N00°19'07", E159°21'40" - E159°21'42"
Secondary Affiliation: Universite Paul Sabatier, FRA, FranceNederlands Instituut voor Zeeonderzoek, NLD, Netherlands
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201917
Program Name: ODPOcean Drilling Program
Program Name: IODPIntegrated Ocean Drilling Program
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