(Table T1) Kerogen and organic constituents in ODP Hole 183-1138A, Kerguelen Plateau
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2002
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| _version_ | 1867168110095630336 |
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| author | Mohr, Barbara A R Wähnert, Veronika Lazarus, David B |
| author_facet | Mohr, Barbara A R Wähnert, Veronika Lazarus, David B |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Mid-Cretaceous sediments recovered during Ocean Drilling Program Leg 183 (Cores 183-1138A-69R to 73R) on the central Kerguelen Plateau have been analyzed palynologically and paleobotanically to determine the age of the strata and to reconstruct vegetational development and paleoecology. The lower strata (Cores 183-1138A-71R to 73R), a dark, organic-rich silty claystone with many wood fragments and fern remains (sedimentary Unit VI), certainly of terrestrial origin, directly overlies the volcanic basement, which is dated as latest Albian (~95 to 103 Ma) to earliest Cenomanian. The age of the terrestrial strata can be determined by sporomorphs as late Albian to earliest Cenomanian as well. This shows that parts of the central Kerguelen Plateau must have been subaerial at least until the late Albian and were covered with a diverse high-latitude flora, probably dense conifer forest with various fern taxa in the undergrowth. Early angiosperms are also present. The vegetational character represented in Unit VI did not change significantly through time. However, varying percentages of several sporomorph groups seem to show recurring abundance variations, which might possibly be cyclic, caused by Milankovitch-type cyclic events. Cores 183-1138A-67R through 69R, of open marine origin, contain medium- to high-diversity dinocyst assemblages. Based on previous stratigraphic zonation schemes, the ages of these strata range within the Heterosphaeridium Superzone, from the Palaeohystrichophora infusorioides Zone to the Conosphaeridium striatoconus Zone, which correlates to the latest Cenomanian to Coniacian. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_785116 |
| institution | PANGAEA |
| language | en |
| publishDate | 2002 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table T1) Kerogen and organic constituents in ODP Hole 183-1138A, Kerguelen Plateau Mohr, Barbara A R Wähnert, Veronika Lazarus, David B 183-1138A; DEPTH, sediment/rock; Dinoflagellate cyst; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Foraminiferal organic linings; Fossil content; Indian Ocean; Joides Resolution; Leg183; Lithologic unit/sequence; Megaspores; Miospores; Ocean Drilling Program; ODP; Resins; Sample code/label Mid-Cretaceous sediments recovered during Ocean Drilling Program Leg 183 (Cores 183-1138A-69R to 73R) on the central Kerguelen Plateau have been analyzed palynologically and paleobotanically to determine the age of the strata and to reconstruct vegetational development and paleoecology. The lower strata (Cores 183-1138A-71R to 73R), a dark, organic-rich silty claystone with many wood fragments and fern remains (sedimentary Unit VI), certainly of terrestrial origin, directly overlies the volcanic basement, which is dated as latest Albian (~95 to 103 Ma) to earliest Cenomanian. The age of the terrestrial strata can be determined by sporomorphs as late Albian to earliest Cenomanian as well. This shows that parts of the central Kerguelen Plateau must have been subaerial at least until the late Albian and were covered with a diverse high-latitude flora, probably dense conifer forest with various fern taxa in the undergrowth. Early angiosperms are also present. The vegetational character represented in Unit VI did not change significantly through time. However, varying percentages of several sporomorph groups seem to show recurring abundance variations, which might possibly be cyclic, caused by Milankovitch-type cyclic events. Cores 183-1138A-67R through 69R, of open marine origin, contain medium- to high-diversity dinocyst assemblages. Based on previous stratigraphic zonation schemes, the ages of these strata range within the Heterosphaeridium Superzone, from the Palaeohystrichophora infusorioides Zone to the Conosphaeridium striatoconus Zone, which correlates to the latest Cenomanian to Coniacian. |
| title | (Table T1) Kerogen and organic constituents in ODP Hole 183-1138A, Kerguelen Plateau |
| topic | 183-1138A; DEPTH, sediment/rock; Dinoflagellate cyst; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Foraminiferal organic linings; Fossil content; Indian Ocean; Joides Resolution; Leg183; Lithologic unit/sequence; Megaspores; Miospores; Ocean Drilling Program; ODP; Resins; Sample code/label |
| url | https://doi.org/10.1594/PANGAEA.785116 |