Intermediate and Late Diagenetic Tetrapyrrole Pigments, Leg 41: Cape Verde Rise and Basin

Baker, Earl W.; Palmer, Susan

doi:10.2973/dsdp.proc.41.123.1978

Cited by 11 publications

(11 citation statements)

References 12 publications

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“…These correspond to C-32, 31, 30, and 29 DPEP. The distribution of molecular weights is similar to free-base porphyrins isolated from previous sediment samples (e.g., Baker et al, 1977, and references therein) and represents a dealkylated series.…”

Section: Free-base Porphyrinssupporting

confidence: 69%

See 1 more Smart Citation

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

Baker¹,

Louda²

1980

Initial Reports of the Deep Sea Drilling Project

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Section: Free-base Porphyrinssupporting

confidence: 69%

“…Electron impact mass spectra were determined with a DuPont 491-BR mass spectrometer. Tetrapyrrole isolates were introduced via solid probe essentially as described previously (e.g., Baker et al, 1977.…”

Section: Samples and Proceduresmentioning

confidence: 99%

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

Baker¹,

Louda²

1980

Initial Reports of the Deep Sea Drilling Project

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“…Some conversion to the etio series by isocyclic ring opening has occurred; however, thermal stresses have not been great enough to cause a significant shift in the DPEP/etio ratio. In addition, no vanadyl porphyrins were found, which may also suggest mild geothermal conditions (Baker et al, 1978b).…”

Section: Discussionmentioning

confidence: 98%

“…Contributions of pigments by hemipelagic mud, here seen as clasts, would be expected to be small. This suggestion is based on the low concentrations of pigments associated with lime muds in general (see Baker et al, 1978b;Palmer etal, 1978).…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll Diagenesis in IPOD Leg 47A, Site 397 Core Samples

Baker¹,

Palmer²

1979

Initial Reports of the Deep Sea Drilling Project

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“…These studies have taken two different paths. The fIrst involves looking for specifIc compounds believed to be necessary intermediates in the degradation of chlorophyll to porphyrins as postulated by at., 1988; Keely et at ., 1990), or by looking for any compound which may have been produced in the transformation of chlorophyll to porphyrins Baker et al, 1976;Baker et al, 1977Baker et al, , 1978aBaker et al, , 1978bBaker and Palmer, 1979;Louda and Palmer, 1980;Baker, 1981, 1986;Baker and Louda, 1980, 1982. The second approach is to look for any sedimentary phorbin, chlorin, or porphyrin, determine its structure, and to postulate a transformation mechanism from a specifIc chlorophyll or heme type starting material (Fookes, 1983; Chicarelli and Maxwell, 1984;Ocampo et aI., 1984Ocampo et aI., , 1985Kauer et at., 1986;Veme-Mismer et al 1988,1990Bauder et at., 1990; Chlorophyll degradation products are also used in the study of carbon cycling since chlorophyll is one of a few compounds unique to photoautotrophic activity.…”

Section: Introductionmentioning

confidence: 99%

Chlorophyll diagenesis in the water column and sediments of the Black Sea

King¹

1992

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This thesis examines the degradation pathways of chlorophyll in the Black Sea water column and sediments. Measurements are made of total chlorophyll in sediment traps from two locations and depths in the water column, and at two locations in surface sediments. Individual chlorophyll degradation products are also identified. This data is used to construct a mass balance of chlorophyll production and sedimentation showing the major pathways for chlorophyll loss and the ultimate sedimentary sinks. The distribution of chlorophyll degradation products is also analyzed down core and related to environmental changes in the Black Sea Several new sinks for chlorophyll degradation products are identified. Steryl esters of pyropheophorbide-a are identified in sediment trap and sediment samples. It is thought that these compounds are formed during grazing. In sediment traps it is found that the distribution of the sterols esterified to pyropheophorbide-a change with season and that the sterols esterified are related to the distribution of sterols synthesized by the phytoplankton living in the photic zone at the time of production. Analysis of pyropheophorbide-a steryl esters in sediments shows the distribution of sterols to be quantitatively and qualitatively more similar to the distribution of free sterols in sediment traps than in sediments. The esterification of the sterols to pyropheophorbide-a apparently prevents the preferential removal of 4-desmethylsterols relative to 4-methylsterols during degradation of the sterol esters.Chlorophyll degradation products which are incorporated into high molecular weight material and material which is only accessible with strong acid are also identified. The chlorophyll degradation products incorporated into these structures represent only a few percent of the total structure. In the high molecular weight material, only phorbins derived from chlorophyll-a are identifies, where as in the acid extractable material, porphyrins are also identified. In surface sediments, the acid extractable chlorophyll degradations products and the solvent extractable macromolecular chlorophyll degradation products each comprise approximately 30% of total sedimentary chlorophyll degradation products. The acid extractable chlorophyll degradation products are identified in sediment trap samples, and evidence is presented for the occurrence of the solvent extractable macromolecular chlorophyll degradation products in sediment trap samples.U sing data from sediment traps, sediments, and the literature, a mass balance of chlorophyll flux, degradation, and accumulation in the Black Sea is presented. In the photic zone, chlorophyll degradation products are either destroyed by photo-oxidation and grazing, or they are transported into the anoxic water column in large, rapidly sinking particles. Once the chlorophyll degradation products have reached the anoxic water column, they survive to be deposited in the underlying sediments. As a comparison, 25 times more total organic carbon reaches the anoxic wate...

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Intermediate and Late Diagenetic Tetrapyrrole Pigments, Leg 41: Cape Verde Rise and Basin

Cited by 11 publications

References 12 publications

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

Chlorophyll Diagenesis in IPOD Leg 47A, Site 397 Core Samples

Chlorophyll diagenesis in the water column and sediments of the Black Sea

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