Climate variability of the Holocene, Site 1098, Palmer Deep, Antarctica

Proceedings of the Ocean Drilling Program: Scientific Results 178-7
By: , and 

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Abstract

Detailed study of four Holocene sediment intervals from Ocean Drilling Program Site 1098 (Palmer Deep, Antarctic Peninsula) reveals that in situ dissolution of calcareous foraminifers in the core repository has significantly altered and in some cases eliminated calcareous foraminifers. Despite dissolution, the foraminifer and supporting diatom data show that the most open-ocean and reduced sea-ice conditions occurred in the early Holocene. The influence of Circumpolar Deep Water was greatest during the early Holocene but continued to be important throughout the Holocene. An increase in sea-ice proximal diatoms at 3500 cal. BP documents an expansion in the amount of persistent sea ice. The inferred increase in sea ice corresponds with an overall increase in magnetic susceptibility values.

Benthic foraminifers are present in all samples from the Palmer Deep, including the middle Holocene pervasively laminated sediments with low magnetic susceptibility values. The consistent presence of mobile epifaunal benthic foraminifers in the laminated sediments demonstrates that the laminations do not represent anoxic conditions. The uniform composition of the agglutinated foraminifer fauna throughout the late Holocene suggests that the Palmer Deep did not experience bottom-water-mass changes associated with the alternating deposition of bioturbated or laminated sediments.

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Publication type Report
Publication Subtype Organization Series
Title Climate variability of the Holocene, Site 1098, Palmer Deep, Antarctica
Series title Proceedings of the Ocean Drilling Program: Scientific Results
Series number 178
Chapter 7
DOI 10.2973/odp.proc.sr.178.203.2001
Year Published 2001
Language English
Publisher Ocean Drilling Program, Texas A&M University
Description 45 p.
First page 1
Last page 45
Country United States
Other Geospatial Antarctica, Antarctic Peninsula, Palmer Deep
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