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

Lisa Mcneill 1 Donna Shillington 2 Gareth Carter 3 Jeremy Everest 3 Robert Gawthorpe 4 Clint Miller 5 Marcie Phillips 6 Richard Collier 7 Aleksandra Cvetkoska 8 Gino de Gelder 9 Paula Diz 10 Mai-Linh Doan 11 Mary Ford 12 Maria Geraga 13 Jack Gillespie 14 Romain Hemelsdaël 15 Emilio Herrero-Bervera 16 Mohammad Ismaiel 17 Liliane Janikian 18 Katerina Kouli 19 Erwan Le Ber 20 Shunli Li 21 Marco Maffione 22 Carol Mahoney 7 Malka Machlus 2 Georgios Michas 23 Casey Nixon 4 Sabire Asli Oflaz 24 Abah Omale 25 Kostas Panagiotopoulos 26 Sofia Pechlivanidou 4 Simone Sauer 27 Joana Seguin 24 Spyros Sergiou 13 Natalia Zakharova 28 Sophie Green 29
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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Soumis le : lundi 18 mai 2020 - 08:33:32
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Lisa Mcneill, Donna Shillington, Gareth Carter, Jeremy Everest, Robert Gawthorpe, et al.. High-resolution record reveals climate-driven environmental and sedimentary changes in an active rift. Scientific Reports, Nature Publishing Group, 2019, 9 (1), ⟨10.1038/s41598-019-40022-w⟩. ⟨hal-02133929⟩



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