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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1980
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| Online Access: | https://doi.org/10.1594/PANGAEA.823174 |
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| _version_ | 1867170964860567552 |
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| author | Louda, William Palmer, Susan E Baker, Earl W |
| author_facet | Louda, William Palmer, Susan E Baker, Earl W |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A relatively well documented record of intermediate and late chlorophyll diagenesis in marine sediments now exists. Intermediate diagenetic stages include conversion of chlorins to DPEP-series porphyrins and subsequent chelation with nickel, vanadyl, and, in special cases, copper. Increasing thermal stress leads to etio-series generation and transalkylation (Baker, 1969; Baker and Smith, 1975; Baker et al., 1977; Palmer and Baker, in press). In contrast, the early transformations of clorophyll are still largely unknown. Very early diagenetic reactions must certainly include loss of magnesium, deesterification, decarboxylation, reduction of ring-conjugating groups, and finally, oxidative-aromatization of carbons 7 and 8 in ring IV to yield free-base porphyrins (Baker and Smith, 1973; Smith and Baker, 1974). Chlorins (7,8-dihydroporphyrins) are very difficult to isolate and identify, because of hydrocarbon impurities which absorb in the blue to violet region of the electromagnetic spectrum and which co-chromatograph with the pigments. Further complications possibly can arise from artifact formation during isolation. In the present study, twelve DSDP Leg 56 core samples, ranging in sub-bottom depth from 4 to 420 meters and in age from Pleistocene to middle Miocene, were analyzed for tetrapyrrole pigments. Chlorins, in concentrations ranging from about 4 to less than 0.002 µg/g sediment, wet weight, were the only tetrapyrroles found. A carotenoid (tetraterpene) was isolated from Section 434-1-3. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_823174 |
| institution | PANGAEA |
| language | en |
| publishDate | 1980 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Pigments isolated from DSDP Leg 56 Holes Louda, William Palmer, Susan E Baker, Earl W 56-434; 56-434B; 56-435; 56-436; Absorption; Atomic absorption spectrometry (AAS); Behaviour; Carbon, organic, total; Comment; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Epoch; Event label; Glomar Challenger; Latitude of event; Leg56; Longitude of event; North Pacific/RIDGE; North Pacific/TRENCH; Pigments, total; Sample code/label; Tetrapyrroles; Type A relatively well documented record of intermediate and late chlorophyll diagenesis in marine sediments now exists. Intermediate diagenetic stages include conversion of chlorins to DPEP-series porphyrins and subsequent chelation with nickel, vanadyl, and, in special cases, copper. Increasing thermal stress leads to etio-series generation and transalkylation (Baker, 1969; Baker and Smith, 1975; Baker et al., 1977; Palmer and Baker, in press). In contrast, the early transformations of clorophyll are still largely unknown. Very early diagenetic reactions must certainly include loss of magnesium, deesterification, decarboxylation, reduction of ring-conjugating groups, and finally, oxidative-aromatization of carbons 7 and 8 in ring IV to yield free-base porphyrins (Baker and Smith, 1973; Smith and Baker, 1974). Chlorins (7,8-dihydroporphyrins) are very difficult to isolate and identify, because of hydrocarbon impurities which absorb in the blue to violet region of the electromagnetic spectrum and which co-chromatograph with the pigments. Further complications possibly can arise from artifact formation during isolation. In the present study, twelve DSDP Leg 56 core samples, ranging in sub-bottom depth from 4 to 420 meters and in age from Pleistocene to middle Miocene, were analyzed for tetrapyrrole pigments. Chlorins, in concentrations ranging from about 4 to less than 0.002 µg/g sediment, wet weight, were the only tetrapyrroles found. A carotenoid (tetraterpene) was isolated from Section 434-1-3. |
| title | (Table 1) Pigments isolated from DSDP Leg 56 Holes |
| topic | 56-434; 56-434B; 56-435; 56-436; Absorption; Atomic absorption spectrometry (AAS); Behaviour; Carbon, organic, total; Comment; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Epoch; Event label; Glomar Challenger; Latitude of event; Leg56; Longitude of event; North Pacific/RIDGE; North Pacific/TRENCH; Pigments, total; Sample code/label; Tetrapyrroles; Type |
| url | https://doi.org/10.1594/PANGAEA.823174 |