(Table 1) Color, Fe-C-S chemistry and carbonate content from ODP Sites 172-1062 and 172-1063

Reflectance spectra collected during ODP Leg 172 were used in concert with solid phase iron chemistry, carbonate content, and organic carbon content measurements to evaluate the agents responsible for setting the color in sediments. Factor analysis has proved a valuable and rapid technique to detect...

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Bibliographic Details
Main Authors: Giosan, Liviu, Flood, Roger D, Aller, Robert C.
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
172-1062D
172-1062E
172-1063A
Blake-Bahama Outer Ridge
North Atlantic Ocean
Carbon
organic
total
Carbonates
Color
C*
Hue
L*
lightness
Coulometry
Dithionite extraction (Lord
1980
PhD Thesis Univ Delaware)
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Element analyser CHN
Carlo Erba
Event label
Factor 1
Factor 2
Factor 3
Iron
colorimetric
Ferrozine (Stookey
1970)
Joides Resolution
Leg172
Ocean Drilling Program
ODP
Sample code/label
Spectrophotometer Perkin-Elmer Lambda 6
Sulfur
Lambda
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.764415
https://doi.org/10.1594/PANGAEA.764415
Description
Summary:Reflectance spectra collected during ODP Leg 172 were used in concert with solid phase iron chemistry, carbonate content, and organic carbon content measurements to evaluate the agents responsible for setting the color in sediments. Factor analysis has proved a valuable and rapid technique to detect the local and regional primary factors that influence sediment color. On the western North Atlantic drifts, sediment color is the result of primary mineralogy as well as diagenetic changes. Sediment lightness is controlled by the carbonate content while the hue is primarily due to the presence of hematite and Fe2+/Fe3+ changes in clay minerals. Hematite, most likely derived from the Permo-Carboniferous red beds of the Canadian Maritimes, is differentially preserved at various sites due to differences in reductive diagenesis and dilution by other sedimentary components. Various intensities for diagenesis result from changes in organic carbon content, sedimentation rates, and H2S production via anaerobic methane oxidation. Iron monosulfides occur extensively at all high sedimentation sites especially in glacial periods suggesting increased high terrigenous flux and/or increased reactive iron flux in glacials.

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