International Ocean Discovery Program; Expedition 381 preliminary report; Corinth active rift development; offshore expedition, 19 October-18 December 2017; onshore science party, 31 January-28 February 2018

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doi: 10.14379/iodp.pr.381.2019
Author(s): Shillington, Donna J.; McNeill, Lisa C.; Carter, Gareth D. O.; Everest, Jeremy; Le Ber, Erwan; Collier, Richard; Cvetkoska, Aleksandra; De Gelder, Gino; Diz Ferreiro, Paula; Doan, Mai-Linh; Ford, Mary; Gawthorpe, Robert; Geraga, Maria; Gillespie, Jack; Hemelsdaël, Romain; Herrero-Bervera, Emilio; Ismaiel, Mohammad; Janikian, Liliane; Kouli, Katerina; Li Shunli; Machlus, Malka Leah; Maffione, Marco; Mahoney, Carol; Michas, Georgios; Miller, Clint; Nixon, Casey; Oflaz, Sabire Asli; Omale, Abah Philip; Panagiotopoulos, Kostas; Pechlivanidou, Sofia; Phillips, Marcie; Sauer, Simone; Seguin, Joana; Sergiou, Spyros; Zakharova, Natalia
Author Affiliation(s): Primary:
Lamont-Doherty Earth Observatory, United States
Other:
University of Southampton, United Kingdom
British Geological Survey, United Kingdom
University of Leicester, United Kingdom
University of Leeds, United Kingdom
Justus Liebig University, Germany
Université Paris Diderot, France
Universidad de Vigo, Spain
Université Grenoble Alpes, France
Centre for Petrographic and Geochemical Research, France
University of Bergen, Norway
University of Patras, Greece
University of Adelaide, Australia
Université de Montpellier, France
University of Hawaii at Manoa, United States
University of Hyderabad, India
Universidade Federal de Sao Paulo, Brazil
National and Kapodistrian University of Athens, Greece
China University of Geosciences-Beijing, China
University of Birmingham, United Kingdom
Technological Educational Institute of Crete, Greece
Rice University, United States
Christian-Albrechts-Universität zu Kiel, Germany
Louisiana State University, United States
University of Cologne, Germany
University of Texas at Austin, United States
French Research Institute for Exploitation of the Sea, France
Central Michigan University, United States
Source: Preliminary Report - International Ocean Discovery Program, Vol.381, 36p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2372-9562
Note: In English. 71 refs.
Summary: The primary objective of International Ocean Discovery Program Expedition 381 was to retrieve a record of early continental rifting and basin evolution from the Corinth rift, central Greece. Continental rifting is fundamental for the formation of ocean basins, and active rift zones are dynamic regions of high geohazard potential. However, the detailed spatial and temporal evolution of a complete rift system needed to understand rift development from the fault to plate scale is poorly resolved. In the active Corinth rift, deformation rates are high, the recent synrift succession is preserved and complete offshore, earlier rift phases are preserved onshore, and a dense seismic database provides high-resolution imaging of the fault network and of seismic stratigraphy around the basin. As the basin has subsided, its depositional environment has been affected by fluctuating global sea level and its absolute position relative to sea level, and the basin sediments record this changing environment through time. In Corinth, we can therefore achieve an unprecedented precision of timing and spatial complexity of rift-fault system development, rift-controlled drainage system evolution, and basin fill in the first few million years of rift history. The following are the expedition themes: • High-resolution fault slip and rift evolution history, • Surface processes in active rifts, • High-resolution late Quaternary Eastern Mediterranean paleoclimate and paleoenvironment of a developing rift basin, and • Geohazard assessment in an active rift. These objectives were and will be accomplished as a result of successful drilling, coring, and logging at three sites in the Gulf of Corinth, which collectively yielded 1645 m of recovered core over a 1905 m cored interval. Cores recovered at these sites together provide (1) a longer rift history (Sites M0078 and M0080), (2) a high-resolution record of the most recent phase of rifting (Site M0079), and (3) the spatial variation of rift evolution (comparison of sites in the central and eastern rift). The sediments contain a rich and complex record of changing sedimentation, sediment and pore water geochemistry, and environmental conditions from micropaleontological assemblages. The preliminary chronology developed by shipboard analyses will be refined and improved during post-expedition research, providing a high-resolution chronostratigraphy down to the orbital timescale for a range of tectonic, sedimentological, and paleoenvironmental studies. This chronology will provide absolute timing of key rift events, rates of fault movement, rift extension and subsidence, and the spatial variations of these parameters. The core data will also allow us to investigate the relative roles of and feedbacks between tectonics, climate, and eustasy in sediment flux and basin evolution. Finally, the Corinth rift boreholes will provide the first long Quaternary record of Mediterranean-type climate in the region. The potential range of scientific applications for this unique data set is very large, encompassing tectonics, sedimentary processes, paleoenvironment, paleoclimate, paleoecology, geochemistry, and geohazards.
Year of Publication: 2019
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Biostratigraphy; Boreholes; Cenozoic; Chemostratigraphy; Chronostratigraphy; Cores; Deformation; Downhole methods; East Mediterranean; Expedition 381; Faults; Geophysical methods; Geophysical profiles; Geophysical surveys; Gulf of Corinth; IODP Site M0078; IODP Site M0079; IODP Site M0080; International Ocean Discovery Program; Ionian Sea; Lithostratigraphy; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Marine sediments; Mediterranean Sea; Microfossils; Paleoenvironment; Paleomagnetism; Physical properties; Plate tectonics; Pore water; Quaternary; Rifting; Sediments; Seismic methods; Seismic profiles; Seismic stratigraphy; Surveys; Well logs
Coordinates: N380842 N380842 E0224530 E0224530
N380930 N380930 E0224143 E0224143
N380712 N380712 E0230511 E0230511
Record ID: 2019012131
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.