Expedition 364 summary

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DOI:10.14379/iodp.proc.364.101.2017
Author(s): Gulick, Sean; Morgan, Joanna; Mellett, Claire; Green, S. L.; Bralower, Tim; Chenot, Elise; Christeson, Gail; Claeys, Philippe; Cockell, Charles; Coolen, Marco; Ferriere, Ludovic; Gehardt, Catalina; Goto, Kazuhisa; Jones, Heather; Kring, David; Lofi, Johanna; Lowery, Christopher; Ocampo-Torres, Rubén; Perez-Cruz, Ligia; Pickersgill, Annemarie E.; Poelchau, Michael; Rae, Auriol; Rasmussen, Cornelia; Rebolledo-Vieyra, Mario; Riller, Ulrich; Sato, Honami; Smit, Jan; Tikoo, Sonia; Tomioka, Naotaka; Urrutia-Fucugauchi, Jaime; Whalen, Michael; Wittmann, Axel; Yamaguchi, Kosei; Long Xiao; Zylberman, William
International Ocean Discovery Program, Expedition 364 Scientists
Author Affiliation(s): Primary:
University of Texas-Austin, Austin, TX, United States
Other:
Imperial College London, Department of Earth Science and Engineering, United Kingdom
British Geological Survey, United Kingdom
Pennsylvania State University, United States
Université de Bourgogne-Franche Comté, France
Vrije Universiteit Brussel, Belgium
University of Edinburgh, United Kingdom
Curtin University, Australia
Natural History Museum, Austria
Alfred Wegener Institute/Helmholtz Centre for Polar and Marine Research, Germany
Tohoku University, Japan
Lunar and Planetary Institute, United States
Université de Montpellier, France
L'Institut de chimie et procdés pour l'energie, l'environnement et la santé, France
Universidad Nacional Autónoma de México, Mexico
University of Glasgow, United Kingdom
University of Freiburg, Germany
University of Utah, United States
Centro de Investigación Cientifica de Yucatán, Mexico
Universität Hamburg, Germany
Japan Agency for Marine-Earth Science and Technology, Japan
Vrije Universiteit Amsterdam, Netherlands
Rutgers University-New Brunswick, United States
University of Alaska-Fairbanks, United States
Arizona State University, United States
Toho University, Japan
China University of Geosciences-Wuhan, China
Aix Marseille University, France
Volume Title: Proceedings of the International Ocean Discovery Program; Chicxulub; drilling the K-Pg impact crater; Expedition 364 of the mission-specific drilling program from and to Progresso, Mexico; Site M0077, 5 April-31 May, 2016
Volume Author(s): Morgan, Joanna; Gulick, Sean; Mellett, Claire; Lofi, Johanna; Chenot, Elise; Christeson, Gail; Claeys, Philippe; Cockell, Charles; Coolen, Marco; Ferriere, Ludovic; Gebhardt, Catalina; Goto, Kazuhisa; Jones, Heather; Kring, David; Lowery, Christopher; Ocampo-Torres, Rubén; Perez-Cruz, Ligia; Pickersgill, Annemarie E.; Poelchau, Michael; Rae, Auriol; Rasmussen, Cornelia; Rebolledo-Vieyra, Mario; Riller, Ulrich; Sato, Honami; Smit, Jan; Tikoo, Sonia; Tomioka, Naotaka; Whalen, Michael; Wittmann, Axel; Yamaguchi, Kosei; Long Xiao; Zylberman, William; Urrutia-Fucugauchi, Jaime; Bralower, Tim
Source: Proceedings of the International Ocean Discovery Program; Chicxulub; drilling the K-Pg impact crater; Expedition 364 of the mission-specific drilling program from and to Progresso, Mexico; Site M0077, 5 April-31 May, 2016, Joanna Morgan, Sean Gulick, Claire Mellett, Johanna Lofi, Elise Chenot, Gail Christeson, Philippe Claeys, Charles Cockell, Marco Coolen, Ludovic Ferriere, Catalina Gebhardt, Kazuhisa Goto, Heather Jones, David Kring, Christopher Lowery, Rubén Ocampo-Torres, Ligia Perez-Cruz, Annemarie E. Pickersgill, Michael Poelchau, Auriol Rae, Cornelia Rasmussen, Mario Rebolledo-Vieyra, Ulrich Riller, Honami Sato, Jan Smit, Sonia Tikoo, Naotaka Tomioka, Michael Whalen, Axel Wittmann, Kosei Yamaguchi, Long Xiao, William Zylberman, Jaime Urrutia-Fucugauchi and Tim Bralower; International Ocean Discovery Program, Expedition 364 Scientists. Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.364, 23p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 CODEN: IDSDA6
Note: In English. 104 refs.; illus., incl. sects., 2 tables, geol. sketch map
Summary: The Chicxulub impact crater, on the Yucatan Peninsula of Mexico, is unique. It is the only known terrestrial impact structure that has been directly linked to a mass extinction event and the only terrestrial impact with a global ejecta layer. Of the three largest impact structures on Earth, Chicxulub is the best preserved. Chicxulub is also the only known terrestrial impact structure with an intact, unequivocal topographic peak ring. Chicxulub's role in the Cretaceous/Paleogene (K-Pg) mass extinction and its exceptional state of preservation make it an important natural laboratory for the study of both large impact crater formation on Earth and other planets and the effects of large impacts on the Earth's environment and ecology. Our understanding of the impact process is far from complete, and despite more than 30 years of intense debate, we are still striving to answer the question as to why this impact was so catastrophic. During International Ocean Discovery Program (IODP) and International Continental Scientific Drilling Program (ICDP) Expedition 364, Paleogene sedimentary rocks and lithologies that make up the Chicxulub peak ring were cored to investigate (1) the nature and formational mechanism of peak rings, (2) how rocks are weakened during large impacts, (3) the nature and extent of post-impact hydrothermal circulation, (4) the deep biosphere and habitability of the peak ring, and (5) the recovery of life in a sterile zone. Other key targets included sampling the transition through a rare midlatitude Paleogene sedimentary succession that might include Eocene and Paleocene hyperthermals and/or the Paleocene/Eocene Thermal Maximum (PETM); the composition and character of suevite, impact melt rock, and basement rocks in the peak ring; the sedimentology and stratigraphy of the Paleocene-Eocene Chicxulub impact basin infill; the geo- and thermochronology of the rocks forming the peak ring; and any observations from the core that may help constrain the volume of dust and climatically active gases released into the stratosphere by this impact. Petrophysical properties measurements on the core and wireline logs acquired during Expedition 364 will be used to calibrate geophysical models, including seismic reflection and potential field data, and the integration of all the data will calibrate models for impact crater formation and environmental effects. The drilling directly contributes to IODP Science Plan goals: Climate and Ocean Change: How does Earth's climate system respond to elevated levels of atmospheric CO2? How resilient is the ocean to chemical perturbations? The Chicxulub impact represents an external forcing event that caused a 75% species level mass extinction. The impact basin may also record key hyperthermals within the Paleogene. Biosphere Frontiers: What are the origin, composition, and global significance of subseafloor communities? What are the limits of life in the subseafloor? How sensitive are ecosystems and biodiversity to environmental change? Impact craters can create habitats for subsurface life, and Chicxulub may provide information on potential habitats for life, including extremophiles, on the early Earth and other planetary bodies. Paleontological and geochemical studies at ground zero will document how large impacts affect ecosystems and biodiversity.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Biostratigraphy; Boreholes; Breccia; Cenozoic; Chemostratigraphy; Chicxulub Crater; Computed tomography data; Cores; Cretaceous; Diatoms; Eocene; Expedition 364; Foraminifera; Geomicrobiology; Gulf of Mexico; IODP Site M0077; Impact breccia; Impact features; Impactites; International Ocean Discovery Program; K-T boundary; Lithostratigraphy; Lower Paleocene; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Mesozoic; Metamorphic rocks; Mexico; Microfossils; Nannofossils; North Atlantic; Ocean floors; Paleocene; Paleocene-Eocene Thermal Maximum; Paleogene; Paleomagnetism; Physical properties; Sedimentary rocks; Stratigraphic boundary; Suevite; Tertiary; Upper Cretaceous; Well logs; Yucatan Mexico
Coordinates: N212700 N212700 W0895700 W0895700
Record ID: 2018010998
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.
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