Rift history, syn-rift sedimentation and paleoenvironment of the Corinth rift basin; IODP Expedition 381 preliminary results

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Author(s): McNeill, Lisa Clare; Shillington, Donna J.; Carter, Gareth
Author Affiliation(s): Primary:
University of Southampton, Ocean and Earth Science, Southampton, United Kingdom
Lamont-Doherty Earth Observatory, United States
British Geological Survey, United Kingdom
Volume Title: AGU 2018 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2018; American Geophysical Union 2018 fall meeting, Washington, DC, Dec. 10-14, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: International Ocean Discovery Program Expedition 381's (2017-2018) primary objectives were to target an active, high-rate rift zone (the Corinth Rift, Central Greece) in order to a) obtain high spatial and temporal resolution records of rift dynamics and evolution, b) study the interaction of climate and tectonics on sedimentary and surface processes, c) improve regional hazard assessments in one of the most seismically active regions of Europe, and d) evaluate the changing environment of an active basin controlled by sea level, climate and subsidence. The expedition drilled, cored and logged at 3 sites along the rift, sampling the syn-rift sedimentary sequence back to ∼1.5 Ma in high resolution. In total 1905 m of section were cored with 85% average recovery. The young rift (∼5 Ma) has evolved in 3 primary phases, involving migration north and changing rift width. Between and within these phases, significant changes in the rift structure and fault networks have taken place, and the rates of these changes can be resolved here due to the high spatio-temporal resolution potential of the syn-rift sequence and available seismic and new borehole data. The connection of the Gulf of Corinth to the Mediterranean is controlled by basin sills and alternates between open ocean/marine and isolated conditions as sea level fluctuates. Observations from Expedition 381 indicate a resulting complex cyclicity of basin paleoenvironment impacting microfossil assemblages, depositional processes and pore-water and sediment geochemistry. A dense network of interpreted marine seismic data and well-studied onshore syn-rift deposits will enable the drilling results to be extended around the entire rift system. New age control now provides constraints on the timing of major rift phases (broadly confirming pre-expedition hypotheses), and is being used to accurately resolve fault slip rates, extension rates and rift development in unprecedented detail. The new results on how the earliest phases of rifting takes place will be used to understand other active and ancient rifts and their syn-rift successions around the world. In addition, the Corinth drilled record provides a rare extended record of the response of a semi-isolated basin to changing Quaternary climate and sea level.
Year of Publication: 2018
Research Program: IODP2 International Ocean Discovery Program
Key Words: 18 Geophysics, Solid-Earth; Corinth Greece; Europe; Expedition 381; Greece; International Ocean Discovery Program; Marine environment; Paleoenvironment; Peloponnesus Greece; Plate tectonics; Rifting; Southern Europe; Tectonics
Record ID: 2019061750
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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