(Table T1) Percentages of CaCO3, TOC, TN, TS of Site 175-1087

Site 1087 is located on the continental rise of southwest Africa at a water depth of 1371 m in the southern part of the Cape Basin. The site is part of the suite of Africa margin locations drilled during Leg 175 to reconstruct the onset and evolution of the elevated biological productivity associate...

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Bibliographic Details
Main Authors: Meyers, Philip A, Robinson, Rex J
Format: Dataset
Language:English
Published: PANGAEA 2001
Subjects:
175-1087A
175-1087C
Benguela Current
South Atlantic Ocean
Calcium carbonate
Calculated
Carbon
organic
total
Carbon/Nitrogen ratio
Carbonate bomb (Müller & Gastner
1971)
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Element analyser CNS
Carlo Erba NA1500
Joides Resolution
Leg175
Nitrogen
Ocean Drilling Program
ODP
Sample code/label
Sulfur
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.59445
https://doi.org/10.1594/PANGAEA.59445
Description
Summary:Site 1087 is located on the continental rise of southwest Africa at a water depth of 1371 m in the southern part of the Cape Basin. The site is part of the suite of Africa margin locations drilled during Leg 175 to reconstruct the onset and evolution of the elevated biological productivity associated with the Benguela Current upwelling system. Measurements of the amounts of inorganic and organic carbon that have accumulated in sediment under this major coastal upwelling regime are essential to this reconstruction, and these were routinely done for the first 12 sites occupied during Leg 175. However, determinations of calcium carbonate and organic carbon concentrations in sediments from Site 1087 had to be deferred to postcruise analysis because the JOIDES Resolution (JR) entered Cape Town 1 day after completing this site. Sediment samples were collected at intervals of three per core from Hole 1087A and the lower part of Hole 1087C to provide a survey of the histories of post-Eocene accumulation of calcium carbonate and organic carbon at this site. The samples were freeze-dried on the ship in preparation for subsequent shore-based analysis. Concentrations of calcium carbonate and organic carbon in the sediment samples were measured at the University of Michigan after the cruise. Organic matter atomic C/N ratios were employed to infer the origin of the organic matter contained within the sediments and to explore some of the factors affecting its preservation and accumulation.

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