Burns, Stephen J. and Maslin, Mark A. (1999): Composition and circulation of bottom water in the western Atlantic Ocean during the last glacial, based on pore-water analyses from the Amazon Fan
Leg/Site/Hole:
Related Expeditions:
ODP 155
Identifier:
ID:
1999-070132
Type:
georefid
ID:
10.1130/0091-7613(1999)027<1011:CACOBW>2.3.CO;2
Type:
doi
Creator:
Name:
Burns, Stephen J.
Affiliation:
Universitaet Bern, Geologisches Institut, Bern, Switzerland
Role:
author
Name:
Maslin, Mark A.
Affiliation:
University College of London, 26 Bedford Way, United Kingdom
Role:
author
Identification:
Title:
Composition and circulation of bottom water in the western Atlantic Ocean during the last glacial, based on pore-water analyses from the Amazon Fan
Year:
1999
Source:
Geology (Boulder)
Publisher:
Geological Society of America (GSA), Boulder, CO, United States
Volume:
27
Issue:
11
Pages:
1011-1014
Abstract:
Pore waters from very rapidly deposited continental margin sediments may provide a record of changes in the isotopic and chemical composition of seawater over time. Measurements made on pore waters extracted from sediments drilled at five sites during Ocean Drilling Program Leg 155 on the Amazon Fan show systematic increases in delta (super 18) O with depth from approximately 0.1 per mil in surface sediments to approximately 0.4 per mil in glacial-age sediments from below about 40 m below sea floor. This relatively small glacial-interglacial difference reflects both the overall increase in delta (super 18) O of seawater during the last glacial and a change in bottom-water source to the area from North Atlantic Deep Water at present to relatively (super 18) O depleted Antarctic Bottom Water during the last glacial. When combined with delta (super 18) O analyses of benthic foraminifers, the pore-water data indicate a glacial-interglacial temperature change of about 4 degrees C.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:6.5701 West:-49.0528 East:
-46.3759 South:4.3544
Keywords: Quaternary geology; Amazon Fan; Anomalinidae; Antarctic Bottom Water; Atlantic Ocean; bottom currents; Brazil; Cassidulinacea; Cenozoic; chloride ion; chlorine; Cibicidoides; Cibicidoides wuellerstorfi; continental margin; currents; Foraminifera; geochemistry; glacial environment; glaciomarine environment; halogens; hydrochemistry; interglacial environment; Invertebrata; isotope ratios; isotopes; Leg 155; marine environment; marine sediments; microfossils; North Atlantic; North Atlantic Deep Water; O-18/O-16; Ocean Drilling Program; ODP Site 939; ODP Site 940; ODP Site 944; ODP Site 946; oxygen; paleo-oceanography; paleocirculation; paleotemperature; pore water; Protista; Quaternary; Rotaliina; sediments; South America; South Atlantic; Southwest Atlantic; stable isotopes; submarine fans; upper Quaternary;
.