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Description / Table of Contents:
Isotopic and geochemical proxies measured in bulk sediment samples of two gravity cores south of Barbados were used to develop a model for the organic carbon accumulation during the last 250?kyr with respect to the influence of terrestrial sources (e.g. the Orinoco and Amazon rivers) as well as the marine contributions, sea-level, surface currents, and morphological features. Total organic carbon (TOC) content and the stable organic carbon isotopes of the organic matter (delta13Corg) show no glacial to interglacial variability. TOC content is generally very low in both cores but increases between 40 and 120?kyr. A comparable pattern is detected in accumulation rates of the organic matter but is only hinted in the delta13Corg ratios. The results suggest that during the last 250?kyr the organic carbon accumulation south of Barbados has been controlled by glacioeustatic sea-level changes and the general morphologic settings. A sea-level stand of 15-80?m below present day seems generally to favour the accumulation of organic matter south of Barbados. Although delta13Corg ratios reveal no clear trend in the organic matter composition, terrestrial organic carbon discharged by rivers (Orinoco or Amazon) seems not to be a major component in the sediments of that area during the last 250?kyr.〈br〉〈br〉REFERENCE:〈br〉Schl?nz, Birger (1998): Riverine Organic Carbon Input into the Ocean in Relation to Late Quaternary Climate Change. Berichte aus dem Fachbereich Geowissenschaften der Universit?t Bremen, 116, 136 pp
Type of Medium:
Online Resource
Pages:
4 Datasets
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Format: application/zip
URL:
http://dx.doi.org/10.1594/PANGAEA.730470
URL:
http://nbn-resolving.de/urn:nbn:de:tib-10.1594/PANGAEA.7304703
URN:
urn:nbn:de:tib-10.1594/PANGAEA.7304703
DOI:
10.1594/PANGAEA.730470
Language:
English
Note:
This dataset is supplement to doi:10.1016/S0967-0637(99)00076-X
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This dataset is cited by urn:urn:nbn:de:gbv:46-ep000102361
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