Deglacial seasonal and sub-seasonal diatom record from Palmer Deep, Antarctica

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doi: 10.1002/jqs.947
Author(s): Maddison, Eleanor J.; Pike, Jennifer; Leventer, Amy; Domack, Eugene W.
Author Affiliation(s): Primary:
Cardiff University, School of Earth, Ocean and Planetary Sciences, Cardiff, United Kingdom
University of Wales at Bangor, United Kingdom
Colgate University, United States
Hamilton College, United States
Volume Title: Annually-banded records in the Quaternary
Volume Author(s): Coxon, P., editor; Scourse, James; Clarke, Leon; Marret, Fabienne
Source: JQS. Journal of Quaternary Science, 20(5), p.435-446; Annually-banded records in the Quaternary, Bangor, United Kingdom, Jan. 6-9, 2004, edited by P. Coxon, James Scourse, Leon Clarke and Fabienne Marret. Publisher: John Wiley and Sons for the Quaternary Research Association, Chichester, United Kingdom. ISSN: 0267-8179
Note: In English. 60 refs.; illus., incl. strat. col., 1 plate, sketch map
Summary: The Antarctic Peninsula is one of the most sensitive regions of Antarctica to climate change. Here, ecological and cryospheric systems respond rapidly to climate fluctuations. A 4.4 m thick laminated diatom ooze deposited during the last deglaciation is examined from a marine sediment core (ODP Site 1098) recovered from Basin I, Palmer Deep, western Antarctic Peninsula. This deglacial laminated interval was deposited directly over a glaciomarine diamict, hence during a globally recognised period of rapid climate change. The ultra-high-resolution deglacial record is analysed using SEM backscattered electron imagery and secondary electron imagery. Laminated to thinly bedded orange-brown diatom ooze (near monogeneric Hyalochaete Chaetoceros spp. resting spores) alternates with blue-grey terrigenous sediments (open water diatom species). These discrete laminae are interpreted as austral spring and summer signals respectively, with negligible winter deposition. Sub-seasonal sub-laminae are observed repeatedly through the summer laminae, suggesting variations in shelf waters throughout the summer. Tidal cycles, high storm intensities and/or intrusion of Circumpolar Deep Water onto the continental shelf introduced conditions which enhanced specific species productivity through the season. Abstract Copyright (2005), Wiley Periodicals, Inc.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Antarctic Peninsula; Antarctica; Assemblages; Cenozoic; Clastic sediments; Deglaciation; Diatoms; Glaciation; Laminations; Leg 177; Lithostratigraphy; Marine environment; Marine sediments; Microfossils; ODP Site 1089; Ocean Drilling Program; Ooze; Paleoclimatology; Paleoenvironment; Palmer Deep; Planar bedding structures; Plantae; Pleistocene; Quaternary; SEM data; Seasonal variations; Sedimentary structures; Sediments; Southern Ocean; Upper Pleistocene
Coordinates: S405611 S405611 E0095338 E0095338
Record ID: 2010010737
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom