Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes
Palynological studies were carried out on Paleogene sections from Sites 693 and 696 of Ocean Drilling Project Leg 113 in the Weddell Sea region. Dinoflagellate cysts and sporomorphs were recovered at Site 696 (61°S, 42°W) indicating a middle Eocene to late Eocene/earliest Oligocene age for a glaucon...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.753222 2024-09-15T17:48:06+00:00 Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes Mohr, Barbara A R MEDIAN LATITUDE: -67.837667 * MEDIAN LONGITUDE: -24.027067 * SOUTH-BOUND LATITUDE: -70.832000 * WEST-BOUND LONGITUDE: -42.933300 * NORTH-BOUND LATITUDE: -61.849000 * EAST-BOUND LONGITUDE: -14.573500 * DATE/TIME START: 1987-01-30T09:00:00 * DATE/TIME END: 1987-03-02T04:15:00 1990 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.753222 https://doi.org/10.1594/PANGAEA.753222 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.753222 https://doi.org/10.1594/PANGAEA.753222 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Mohr, Barbara A R (1990): Eocene and Oligocene sporomorphs and dinoflagellate cysts from Leg 113 drill sites, Weddell Sea, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 595-612, https://doi.org/10.2973/odp.proc.sr.113.140.1990 113-693A 113-693B 113-696B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea dataset publication series 1990 ftpangaea https://doi.org/10.1594/PANGAEA.75322210.2973/odp.proc.sr.113.140.1990 2024-07-24T02:31:20Z Palynological studies were carried out on Paleogene sections from Sites 693 and 696 of Ocean Drilling Project Leg 113 in the Weddell Sea region. Dinoflagellate cysts and sporomorphs were recovered at Site 696 (61°S, 42°W) indicating a middle Eocene to late Eocene/earliest Oligocene age for a glauconitic silt/sandstone. At Site 693 (70°S, 14°W) early Oligocene siliciclastic mud contains a low diversity palynoflora. In an upper Oligocene section (Site 693) only rare, reworked Mesozoic palynomorphs were encountered. Palynological data from Kerogen analyses, dinocysts, and sporomorphs are used to reconstruct the climatic change on the South Orkney microcontinent from the middle Eocene to the late Eocene/earliest Oligocene at Site 696 and the late early Oligocene/early late Oligocene time interval at Site 693 near the continental margin. The middle Eocene was a warm period in the Orkney region with good growing conditions for a warm temperate Nothofagus/conifer forest with an admixture of Proteaceae. Temperate surface water masses, which allowed the growth of a reasonably diverse dinocyst assemblage (ca. 15-20 species), persisted until the end of the Eocene at Site 696. Late early Oligocene sediments of Site 693 (Antarctic continental margin) contain only a low diversity dinocyst flora (two species). The major Cenozoic cooling event in the Weddell Sea region probably occurred at the Eocene/Oligocene boundary. A second dramatic climatic deterioration seems to have taken place during the late early/early late Oligocene, when dinocysts disappeared at the Dronning Maud Land margin area. Other/Unknown Material Antarc* Antarctic Dronning Maud Land Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-42.933300,-14.573500,-61.849000,-70.832000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-693A 113-693B 113-696B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea |
spellingShingle |
113-693A 113-693B 113-696B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea Mohr, Barbara A R Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes |
topic_facet |
113-693A 113-693B 113-696B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea |
description |
Palynological studies were carried out on Paleogene sections from Sites 693 and 696 of Ocean Drilling Project Leg 113 in the Weddell Sea region. Dinoflagellate cysts and sporomorphs were recovered at Site 696 (61°S, 42°W) indicating a middle Eocene to late Eocene/earliest Oligocene age for a glauconitic silt/sandstone. At Site 693 (70°S, 14°W) early Oligocene siliciclastic mud contains a low diversity palynoflora. In an upper Oligocene section (Site 693) only rare, reworked Mesozoic palynomorphs were encountered. Palynological data from Kerogen analyses, dinocysts, and sporomorphs are used to reconstruct the climatic change on the South Orkney microcontinent from the middle Eocene to the late Eocene/earliest Oligocene at Site 696 and the late early Oligocene/early late Oligocene time interval at Site 693 near the continental margin. The middle Eocene was a warm period in the Orkney region with good growing conditions for a warm temperate Nothofagus/conifer forest with an admixture of Proteaceae. Temperate surface water masses, which allowed the growth of a reasonably diverse dinocyst assemblage (ca. 15-20 species), persisted until the end of the Eocene at Site 696. Late early Oligocene sediments of Site 693 (Antarctic continental margin) contain only a low diversity dinocyst flora (two species). The major Cenozoic cooling event in the Weddell Sea region probably occurred at the Eocene/Oligocene boundary. A second dramatic climatic deterioration seems to have taken place during the late early/early late Oligocene, when dinocysts disappeared at the Dronning Maud Land margin area. |
format |
Other/Unknown Material |
author |
Mohr, Barbara A R |
author_facet |
Mohr, Barbara A R |
author_sort |
Mohr, Barbara A R |
title |
Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes |
title_short |
Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes |
title_full |
Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes |
title_fullStr |
Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes |
title_full_unstemmed |
Sporomorphs and dinoflagellate cysts of ODP Leg 113 holes |
title_sort |
sporomorphs and dinoflagellate cysts of odp leg 113 holes |
publisher |
PANGAEA |
publishDate |
1990 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.753222 https://doi.org/10.1594/PANGAEA.753222 |
op_coverage |
MEDIAN LATITUDE: -67.837667 * MEDIAN LONGITUDE: -24.027067 * SOUTH-BOUND LATITUDE: -70.832000 * WEST-BOUND LONGITUDE: -42.933300 * NORTH-BOUND LATITUDE: -61.849000 * EAST-BOUND LONGITUDE: -14.573500 * DATE/TIME START: 1987-01-30T09:00:00 * DATE/TIME END: 1987-03-02T04:15:00 |
long_lat |
ENVELOPE(-42.933300,-14.573500,-61.849000,-70.832000) |
genre |
Antarc* Antarctic Dronning Maud Land Weddell Sea |
genre_facet |
Antarc* Antarctic Dronning Maud Land Weddell Sea |
op_source |
Supplement to: Mohr, Barbara A R (1990): Eocene and Oligocene sporomorphs and dinoflagellate cysts from Leg 113 drill sites, Weddell Sea, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 595-612, https://doi.org/10.2973/odp.proc.sr.113.140.1990 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.753222 https://doi.org/10.1594/PANGAEA.753222 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.75322210.2973/odp.proc.sr.113.140.1990 |
_version_ |
1810289147574747136 |