Limited oxygen deficiency in the Arabian Sea during the Miocene

DOI

This dataset contains foraminiferal calcite trace element (I/Ca, Mn/Ca, Mg/Ca, Sr/Ca, Fe/Ca), foraminifera-bound (FB- δ15N) and bulk sediment nitrogen isotope, and lipid biomarker (GDGT) data from sediment core samples at Ocean Drilling Program Sites 730 and 714 in the Arabian Sea. Trace element ratios in foraminiferal calcite serve as proxies for bottom and subsurface oxygenation, and FB-δ15N data are used to reconstruct water column denitrification under extremely low oxygen conditions. GDGT concentrations and Mg/Ca are used to assess Arabian Sea upwelling, and %GDGTRS is used to reconstruct Tethys outflow waters. The data span key intervals of the Miocene, including the Miocene Climate Optimum, and capture long-term variations in Arabian Sea oxygenation in a warmer world. The integrated multi-proxy approach shows the evolution of the Arabian Sea OMZ and its response to climate and oceanographic changes. The data suggest that a persistent OMZ existed since at least the Early Miocene, with further deoxygenation following the MCO, leading to the development of a true oxygen-deficient zone with active denitrification.

Identifier
DOI https://doi.pangaea.de/10.1594/PANGAEA.982881
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.982881
Provenance
Creator Hess, Anya ORCID logo; Auderset, Alexandra ORCID logo; Rosenthal, Yair ORCID logo; Sigman, Daniel M ORCID logo; Martínez-García, Alfredo
Publisher PANGAEA
Publication Year 2025
Funding Reference National Science Foundation https://doi.org/10.13039/100000001 Crossref Funder ID OCE-2303513 ; Swiss National Science Foundation https://doi.org/10.13039/501100001711 Crossref Funder ID P2EZP2_200000
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints); https://creativecommons.org/licenses/by/4.0/
OpenAccess false
Representation
Resource Type Bundled Publication of Datasets; Collection
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (57.692W, -30.941S, 115.535E, 17.731N)
Temporal Coverage Begin 1987-06-23T00:00:00Z
Temporal Coverage End 1988-07-25T00:00:00Z