Neogene tectonic and climatic evolution of the Western Ross Sea, Antarctica – chronology of events from the AND-1B drill hole.

• Published in: Global and Planetary Change
• Main Authors: Gary S. Wilson, Richard H. Levy, Tim R. Naish, Ross D. Powell, Fabio Florindo, Christian Ohneiser, Leonardo Sagnotti, Diane M. Winter, Rosemary Cody, Stuart Henrys, Jake Ross, Larry Krissek, Frank Niessen, Massimo Pompillio, Reed Scherer, Brent V. Alloway, Peter J. Barrett, Stefanie Brachfeld, Greg Browne, Lionel Carter, Ellen Cowan, James Crampton, Robert M. DeConto, Gavin Dunbar, Nelia Dunbar, Robert Dunbar, Hilmar von Eynatten, Catalina Gebhardt, Giovanna Giorgetti, Ian Graham, Mike Hannah, Dhiresh Hansaraj, David M. Harwood, Linda Hinnovs, Richard D. Jarrard, Leah Joseph, Michelle Kominz, Gerhard Kuhn, Philip Kyle, Andreas Läufer, William C. McIntosh, Robert McKay, Paola Maffioli, Diana Magens, Christina Millan, Donata Monien k, Roger Morin y, Timothy Paulsen, PERSICO, Davide, David Pollard, J. Ian Raine, Christina Riesselman, Sonia Sandroni, Doug Schmitt, Charlotte Sjunneskog, C. Percy Strong, Franco Talarico, Marco Taviani, Stefan Vogel, Tom Wilch, Trevor Williams, Terry J. Wilson, Sherwood Wise, VILLA, Giuliana
• Other Authors: Gary S., Wilson, Richard H., Levy, Tim R., Naish, Ross D., Powell, Fabio, Florindo, Christian, Ohneiser, Leonardo, Sagnotti, Diane M., Winter, Rosemary, Cody, Stuart, Henry, Jake, Ro, Larry, Krissek, Frank, Niessen, Massimo, Pompillio, Reed, Scherer, Brent V., Alloway, Peter J., Barrett, Stefanie, Brachfeld, Greg, Browne, Lionel, Carter, Ellen, Cowan, James, Crampton, Robert M., Deconto, Gavin, Dunbar, Nelia, Dunbar, Robert, Dunbar, Hilmar von, Eynatten, Catalina, Gebhardt, Giovanna, Giorgetti, Ian, Graham, Mike, Hannah, Dhiresh, Hansaraj, David M., Harwood, Linda, Hinnov, Richard D., Jarrard, Leah, Joseph, Michelle, Kominz, Gerhard, Kuhn, Philip, Kyle, Andreas, Läufer, William C., Mcintosh, Robert, Mckay, Paola, Maffioli, Diana, Magen, Christina, Millan, Donata Monien, K, Roger Morin, Y, Timothy, Paulsen, Persico, Davide, David, Pollard
• Format: Article in Journal/Newspaper
• Language: Middle English
• Published: 2012
• Subjects: Stratigraphic Drilling McMurdo Ice Shelf Chronostratigraphy Neogene Tectonics Ice Sheet history; Antarc*; Antarctica; Ice Sheet; Ice Shelf; McMurdo Ice Shelf; Ross Sea
• Online Access: http://hdl.handle.net/11381/2534446; https://doi.org/10.1016/j.gloplacha.2012.05.019

Stratigraphic drilling from the McMurdo Ice Shelf in the 2006/2007 austral summer recovered a 1284.87 m sedimentary succession from beneath the sea floor. Key age data for the core include magnetic polarity stratigraphy for the entire succession, diatom biostratigraphy for the upper 600 m and 40Ar/39Ar ages for in-situ volcanic deposits as well as reworked volcanic clasts. A vertical seismic profile for the drill hole allows correlation between the drill hole and a regional seismic network and inference of age constraint by correlation with well‐dated regional volcanic events through direct recognition of interlayered volcanic deposits as well as by inference from flexural loading of pre‐existing strata. The combined age model implies relatively rapid (1 m/2–5 ky) accumulation of sediment punctuated by hiatuses, which account for approximately 50% of the record. Three of the longer hiatuses coincide with basin‐wide seismic reflectors and, along with two thick volcanic intervals, they subdivide the succession into seven chronostratigraphic intervals with characteristic facies: 1. The base of the cored succession (1275–1220 mbsf) comprises middle Miocene volcaniclastic sandstone dated at approx 13.5 Ma by several reworked volcanic clasts; 2. A late-Miocene sub-polar orbitally controlled glacial–interglacial succession (1220–760 mbsf) bounded by two unconformities correlated with basin‐wide reflectors associated with early development of the terror rift; 3. A late Miocene volcanigenic succession (760–596 mbsf) terminating with a ~1 my hiatus at 596.35 mbsf which spans the Miocene–Pliocene boundary and is not recognised in regional seismic data; 4. An early Pliocene obliquity-controlled alternating diamictite and diatomite glacial–interglacial succession (590–440 mbsf), separated from; 5. A late Pliocene obliquity-controlled alternating diamictite and diatomite glacial–interglacial succession (440–150 mbsf) by a 750 ky unconformity interpreted to represent a major sequence boundary at other locations; 6. An early ...