Imperial College London
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ProfessorTinavan de Flierdt

Faculty of Engineering, Department of Earth Science & Engineering

Head of the Department of Earth Science and Engineering
 
 
 
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Contact

 

+44 (0)20 7594 1290tina.vandeflierdt

 
 
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Location

 

G.30Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Evangelinos:2022:10.1016/j.gloplacha.2021.103718,
author = {Evangelinos, D and Escutia, C and van, de Flierdt T and Valero, L and Flores, J-A and Harwood, DM and Hoem, FS and Bijl, P and Etourneau, J and Kreissig, K and Nilsson-Kerr, K and Holder, L and Lopez-Quiros, A and Salabarnada, A},
doi = {10.1016/j.gloplacha.2021.103718},
journal = {Global and Planetary Change},
pages = {1--12},
title = {Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene},
url = {http://dx.doi.org/10.1016/j.gloplacha.2021.103718},
volume = {208},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The vigorous eastward flow of the Antarctic Circumpolar Current (ACC) connects all major ocean basins and plays a prominent role in the transport of heat, carbon and nutrients around the globe. However, the establishment of a deep circumpolar flow, similar to the present-day ACC, remains controversial thereby obscuring our understanding of its climatic impact. Deciphering the chemical composition of Circumpolar Deep Water (CDW) within the ACC can provide critical insights about its development and evolution. Here we present new fossil fish teeth/bone debris neodymium isotope (εNd) records from Deep Sea Drilling Project (DSDP) Sites 278 and 274 in the southwest Pacific Ocean, with the aim to trace changes in deep water masses across the Tasmanian Gateway between the early Oligocene and early Miocene (~ 33–22 Ma). Site 274 provides the first Nd isotope record proximal to the Ross Sea during the Oligocene (33.5–23.4 Ma). Its Nd isotope composition shows excursions to very radiogenic values, εNd(t) = −3.1 and εNd(t)= − 3.7, at 33.5 Ma and 23.8 Ma, respectively, in response to major steps in Antarctic ice sheet expansion. A shift to lower, more unradiogenic εNd(t) values between 29.7 and 29.1 Ma is linked to an increased influence of proto-CDW upwelling at the site. In contrast, the Nd isotope record from Site 278 in the southern Emerald Basin shows little variability (εNd(t) = −6.0 to −6.7) throughout the Oligocene and early Miocene (30.9–21.8 Ma). Comparison with published data north of the ACC path, demonstrates the presence of two deep water masses in the South Pacific prior to the inferred onset of the ACC (33–30 Ma), one occupying depths between ~2500 and 3000 m (εNd(t)= ~ −3 to −5) and a deep/bottom water mass (> 3000 m) with a more unradiogenic Nd isotope composition (εNd(t)= ~ −6). Site 278 located close to the proto-polar front (proto-PF)
AU  - Evangelinos,D
AU  - Escutia,C
AU  - van,de Flierdt T
AU  - Valero,L
AU  - Flores,J-A
AU  - Harwood,DM
AU  - Hoem,FS
AU  - Bijl,P
AU  - Etourneau,J
AU  - Kreissig,K
AU  - Nilsson-Kerr,K
AU  - Holder,L
AU  - Lopez-Quiros,A
AU  - Salabarnada,A
DO  - 10.1016/j.gloplacha.2021.103718
EP  - 12
PY  - 2022///
SN  - 0921-8181
SP  - 1
TI  - Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene
T2  - Global and Planetary Change
UR  - http://dx.doi.org/10.1016/j.gloplacha.2021.103718
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000740506800004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/pii/S0921818121003039?via%3Dihub
UR  - http://hdl.handle.net/10044/1/95072
VL  - 208
ER  -
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