Pigment preservation and remineralization in oxic coastal marine sediments

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Geochim. Cosmochim. Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(88)90058-0· OSTI ID:7222743

Furlong, E T; Carpenter, R

Complex mixtures of sedimentary chlorophyll degradation products were measured using high performance liquid chromatography (HPLC) in /sup 210/Pb dated box- and piston-core sediments. Sediments were collected from Dabob Bay, Washington, a coastal marine fjord conducive to studies yielding an understanding of the remineralization and diagenesis of organic carbon. Greater than 99% of the pheopigment flux out of the water column does not accumulate in the top 2 cm of sediment. Surface sediment pigment profiles indicate that pheophoribides are the dominant pheopigments observed, with concentrations decreasing rapidly with depth. Concentrations of chlorophyll c derivatives also decrease rapidly, but ratios of a/c pheopigments remain within ranges reported for natural and cultured phytoplankton. Sharp pheopigment concentrations decreases within the bioturbated surface sediments were modeled using a one dimensional mixing model. Sedimentary humic acid, fulvic acid, and residual humin associated pheopigments in sediments which had been previously acetone extracted to remove the lipophilic pheopigment fraction were typed by chromic acid oxidation and release of pyrrole derived maleimides. This humic associated pyrrole derived nitrogen, while a small fraction of total sedimentary or humic nitrogen, accounted for 16-75% of the total sedimentary pheopigment accumulation, and may be significant in understanding the diagenetic fate and transformation of pheopigments to petroporphyrins.

• Research Organization: Univ. of Washington, Seattle (USA)
• OSTI ID: 7222743
• Journal Information: Geochim. Cosmochim. Acta; (United States), Journal Name: Geochim. Cosmochim. Acta; (United States) Vol. 52:1; ISSN GCACA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
BIOGEOCHEMISTRY
CARBON
CARBOXYLIC ACIDS
CHEMISTRY
CHLOROPHYLL
CHROMATOGRAPHY
DEPOSITION
DIAGENESIS
EARTH CRUST
ELEMENTS
FEDERAL REGION X
GEOCHEMISTRY
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LIQUID COLUMN CHROMATOGRAPHY
MINERALIZATION
NONMETALS
NORTH AMERICA
OCEANIC CRUST
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PORPHYRINS
PROTEINS
SEDIMENTATION
SEDIMENTS
SEPARATION PROCESSES
USA
WASHINGTON