The early Holocene deglaciation of the East Antarctic margin (11.5 ka-8.0 ka cal BP); a high resolution geochemical study from Site U1357 (Adélie Land)

Author(s): Jimenez-Espejo, Francisco J.; Etourneau, Johan; Dunbar, Robert; Willmott, Veronica; Escutia, Carlota; van de Flierdt, Tina; Crosta, Xavier; Massé, G.
Integrated Ocean Drilling Program, Expedition 318 Scientists
Author Affiliation(s): Primary:
Instituto Andaluz de Ciencias de la Tierra, Armilla, Spain
Other:
Université Pierre et Marie Curie, France
Stanford University, United States
Alfred Wegener Institute for Polar and Marine Research, Germany
Imperial College London, United Kingdom
Université Bordeaux, France
Volume Title: 34th international geological congress; abstracts
Source: International Geological Congress [International Geological Congress, Abstracts = Congrès Géologique International, Résumés, Vol.34, p.356; 34th international geological congress, Brisbane, Queensl., Australia, Aug. 5-10, 2012. Publisher:], [location varies], International CODEN: IGABBY
Note: In English. Accessed on June 20, 2014
Summary: During IODP Expedition 318 a unique 200 m sequence of likely annually layered sediments spanning the Holocene (ca. the last 11,700 yrs BP) was recovered from the Terre Adélie margin (East Antarctica, Site U1357). The laminated sediments consist predominantly of diatom and radiolarian remains and reveal cyclic coarse detrital layers in the lowermost part. Geochemical studies have been conducted on cores from holes U1357A and B at ultra-high (seasonal to decadal) resolution using X-Ray Fluorescence scanning. The ratio of the concentrations of highly branched isoprenoid (HBI) diene/triene, a diatom-specific biomarker, also has been used as a proxy for relative inputs of sea-ice algae and open water phytoplankton that gives indication on past sea-ice cover. Organic and inorganic geochemical proxies can be related to major fluctuations in local deep water formation, sea ice presence, and detrital inputs from the continent, probably reflecting retreat or advances of nearby glaciers.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Adelie Coast; Algae; Antarctica; Biomarkers; Cenozoic; Continental margin; Deglaciation; Diatoms; East Antarctica; Expedition 318; Glaciers; Holocene; IODP Site U1357; Ice; Integrated Ocean Drilling Program; Invertebrata; Isoprenoids; Lower Holocene; Microfossils; Organic compounds; Phytoplankton; Plankton; Plantae; Protista; Quaternary; Radiolaria; Sea ice; Southern Ocean; Spectra; Wilkes Land; X-ray fluorescence spectra
Coordinates: S662448 S662448 E1402531 E1402531
Record ID: 2014083250
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data supplied by International Geological Congress Organizational Committee