Analysis of macerals in sediment core 159-959C
Fuente:
PANGAEA
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Dataset Open Access |
| Sprache: | en |
| Veröffentlicht: |
PANGAEA
1999
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1867170485684404224 |
|---|---|
| author | Wagner, Thomas |
| author_facet | Wagner, Thomas |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Organic petrologic and geochemical analyses were performed on modern and Quaternary organic carbon-poor deep sea sediments from the Equatorial Atlantic. The study area covers depositional settings from the West African margin (ODP Site 959) through the Equatorial Divergence (ODP Site 663) to the pelagic Equatorial Atlantic. Response of organic matter (OM) deposition to Quaternary climatic cycles is discussed for ODP Sites 959 and 663. The results are finally compared to a concept established for fossil deep sea environments [Littke and Sachsenhofer, 1994 doi:10.1021/ef00048a041]. Organic geochemical results obtained from Equatorial Atlantic deep sea deposits provide new aspects on the distribution of sedimentary OM in response to continental distance, atmospheric and oceanographic circulation, and depositional processes controlling sedimentation under modern and past glacial–interglacial conditions. The inventory of macerals in deep sea deposits is limited due to mechanical breakdown of particles, degree of oxidation, and selective remineralization of labile (mostly marine) OM. Nevertheless, organic petrology has a great potential for paleoenvironmental studies, especially as a proxy to assess quantitative information on the relative abundance of marine vs. terrigenous OM. Discrepancies between quantitative data obtained from microscopic and isotopic (delta13Corg) analyses were observed depending on the stratigraphic level and depositional setting. Strongest offset between both records was found close to the continent and during glacial periods, suggesting a coupling with wind-born terrigenous OM from central Africa. Since African dust source areas are covered by C4 grass plants, supply of isotopically heavy OM is assumed to have caused the difference between microscopic and isotopic records. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_56135 |
| institution | PANGAEA |
| language | en |
| publishDate | 1999 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Analysis of macerals in sediment core 159-959C Wagner, Thomas 159-959C; AGE; Alginite; Carbon, organic, total; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, LECO; Fluorescent microscope; Gulf of Guinea; Hydrogen index *; Inertinite; Inertinite/Vitrinite ratio; Inertodetrinite; Joides Resolution; Leg159; Liptodetrinite; Ocean Drilling Program; ODP; Organic petrology; Rock eval pyrolysis (Behar et al., 2001); Sample code/label; Vitrinite; Vitrodetrinite Organic petrologic and geochemical analyses were performed on modern and Quaternary organic carbon-poor deep sea sediments from the Equatorial Atlantic. The study area covers depositional settings from the West African margin (ODP Site 959) through the Equatorial Divergence (ODP Site 663) to the pelagic Equatorial Atlantic. Response of organic matter (OM) deposition to Quaternary climatic cycles is discussed for ODP Sites 959 and 663. The results are finally compared to a concept established for fossil deep sea environments [Littke and Sachsenhofer, 1994 doi:10.1021/ef00048a041]. Organic geochemical results obtained from Equatorial Atlantic deep sea deposits provide new aspects on the distribution of sedimentary OM in response to continental distance, atmospheric and oceanographic circulation, and depositional processes controlling sedimentation under modern and past glacial–interglacial conditions. The inventory of macerals in deep sea deposits is limited due to mechanical breakdown of particles, degree of oxidation, and selective remineralization of labile (mostly marine) OM. Nevertheless, organic petrology has a great potential for paleoenvironmental studies, especially as a proxy to assess quantitative information on the relative abundance of marine vs. terrigenous OM. Discrepancies between quantitative data obtained from microscopic and isotopic (delta13Corg) analyses were observed depending on the stratigraphic level and depositional setting. Strongest offset between both records was found close to the continent and during glacial periods, suggesting a coupling with wind-born terrigenous OM from central Africa. Since African dust source areas are covered by C4 grass plants, supply of isotopically heavy OM is assumed to have caused the difference between microscopic and isotopic records. |
| title | Analysis of macerals in sediment core 159-959C |
| topic | 159-959C; AGE; Alginite; Carbon, organic, total; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, LECO; Fluorescent microscope; Gulf of Guinea; Hydrogen index *; Inertinite; Inertinite/Vitrinite ratio; Inertodetrinite; Joides Resolution; Leg159; Liptodetrinite; Ocean Drilling Program; ODP; Organic petrology; Rock eval pyrolysis (Behar et al., 2001); Sample code/label; Vitrinite; Vitrodetrinite |
| url | https://doi.org/10.1594/PANGAEA.56135 |