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High-resolution record reveals climate-driven environmental and sedimentary changes in an active rift

High-resolution record reveals climate-driven environmental and sedimentary changes in an active rift
High-resolution record reveals climate-driven environmental and sedimentary changes in an active rift

Young rifts are shaped by combined tectonic and surface processes and climate, yet few records exist to evaluate the interplay of these processes over an extended period of early rift-basin development. Here, we present the longest and highest resolution record of sediment flux and paleoenvironmental changes when a young rift connects to the global oceans. New results from International Ocean Discovery Program (IODP) Expedition 381 in the Corinth Rift show 10s–100s of kyr cyclic variations in basin paleoenvironment as eustatic sea level fluctuated with respect to sills bounding this semi-isolated basin, and reveal substantial corresponding changes in the volume and character of sediment delivered into the rift. During interglacials, when the basin was marine, sedimentation rates were lower (excepting the Holocene), and bioturbation and organic carbon concentration higher. During glacials, the basin was isolated from the ocean, and sedimentation rates were higher (~2–7 times those in interglacials). We infer that reduced vegetation cover during glacials drove higher sediment flux from the rift flanks. These orbital-timescale changes in rate and type of basin infill will likely influence early rift sedimentary and faulting processes, potentially including syn-rift stratigraphy, sediment burial rates, and organic carbon flux and preservation on deep continental margins worldwide.

2045-2322
1-11
McNeill, Lisa C.
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Collier, Richard E.Ll
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Ford, Mary
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Zakharova, Natalia V.
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Green, Sophie
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McNeill, Lisa C., Shillington, Donna J., Carter, Gareth D.O., Everest, Jeremy D., Gawthorpe, Robert L., Miller, Clint, Phillips, Marcie P., Collier, Richard E.Ll, Cvetkoska, Aleksandra, De Gelder, Gino, Diz, Paula, Doan, Mai Linh, Ford, Mary, Geraga, Maria, Gillespie, Jack, Hemelsdaël, Romain, Herrero-Bervera, Emilio, Ismaiel, Mohammad, Janikian, Liliane, Kouli, Katerina, Le Ber, Erwan, Li, Shunli, Maffione, Marco, Mahoney, Carol, Machlus, Malka L., Michas, Georgios, Nixon, Casey W., Oflaz, Sabire Asli, Omale, Abah P., Panagiotopoulos, Kostas, Pechlivanidou, Sofia, Sauer, Simone, Seguin, Joana, Sergiou, Spyros, Zakharova, Natalia V. and Green, Sophie (2019) High-resolution record reveals climate-driven environmental and sedimentary changes in an active rift. Scientific Reports, 9 (1), 1-11. (doi:10.1038/s41598-019-40022-w).

Record type: Article

Abstract

Young rifts are shaped by combined tectonic and surface processes and climate, yet few records exist to evaluate the interplay of these processes over an extended period of early rift-basin development. Here, we present the longest and highest resolution record of sediment flux and paleoenvironmental changes when a young rift connects to the global oceans. New results from International Ocean Discovery Program (IODP) Expedition 381 in the Corinth Rift show 10s–100s of kyr cyclic variations in basin paleoenvironment as eustatic sea level fluctuated with respect to sills bounding this semi-isolated basin, and reveal substantial corresponding changes in the volume and character of sediment delivered into the rift. During interglacials, when the basin was marine, sedimentation rates were lower (excepting the Holocene), and bioturbation and organic carbon concentration higher. During glacials, the basin was isolated from the ocean, and sedimentation rates were higher (~2–7 times those in interglacials). We infer that reduced vegetation cover during glacials drove higher sediment flux from the rift flanks. These orbital-timescale changes in rate and type of basin infill will likely influence early rift sedimentary and faulting processes, potentially including syn-rift stratigraphy, sediment burial rates, and organic carbon flux and preservation on deep continental margins worldwide.

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s41598-019-40022-w - Version of Record
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Accepted/In Press date: 28 January 2019
e-pub ahead of print date: 28 February 2019

Identifiers

Local EPrints ID: 428939
URI: https://eprints.soton.ac.uk/id/eprint/428939
ISSN: 2045-2322
PURE UUID: 429ff255-2615-4bf3-9a5a-d2c734aa47ce

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Date deposited: 15 Mar 2019 17:30
Last modified: 09 Dec 2019 17:41

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Contributors

Author: Lisa C. McNeill
Author: Donna J. Shillington
Author: Gareth D.O. Carter
Author: Jeremy D. Everest
Author: Robert L. Gawthorpe
Author: Clint Miller
Author: Marcie P. Phillips
Author: Richard E.Ll Collier
Author: Aleksandra Cvetkoska
Author: Gino De Gelder
Author: Paula Diz
Author: Mai Linh Doan
Author: Mary Ford
Author: Maria Geraga
Author: Jack Gillespie
Author: Romain Hemelsdaël
Author: Emilio Herrero-Bervera
Author: Mohammad Ismaiel
Author: Liliane Janikian
Author: Katerina Kouli
Author: Erwan Le Ber
Author: Shunli Li
Author: Marco Maffione
Author: Carol Mahoney
Author: Malka L. Machlus
Author: Georgios Michas
Author: Casey W. Nixon
Author: Sabire Asli Oflaz
Author: Abah P. Omale
Author: Kostas Panagiotopoulos
Author: Sofia Pechlivanidou
Author: Simone Sauer
Author: Joana Seguin
Author: Spyros Sergiou
Author: Natalia V. Zakharova
Author: Sophie Green

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