Early Albian palynoflora of ODP Hole 120-750B
A well-preserved, diverse sporomorph flora of over 60 species has been found in Cores 120-750B-12W through -14R from the Southern Kerguelen Plateau. Analysis of the flora indicates that the terrestrial sediments overlaying the basaltic basement are late Early Cretaceous in age. Ranges of the sporomo...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1992
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.758092 https://doi.org/10.1594/PANGAEA.758092 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.758092 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.758092 2023-05-15T17:02:06+02:00 Early Albian palynoflora of ODP Hole 120-750B Mohr, Barbara A R Gee, Carole T LATITUDE: -57.592000 * LONGITUDE: 81.239500 * DATE/TIME START: 1988-04-20T05:00:00 * DATE/TIME END: 1988-04-23T04:00:00 1992-03-08 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.758092 https://doi.org/10.1594/PANGAEA.758092 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.758092 https://doi.org/10.1594/PANGAEA.758092 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Mohr, Barbara A R; Gee, Carole T (1992): An early Albian palynoflora from the Kerguelen Plateau, Southern Indian Ocean (Leg 120). In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 255-271, https://doi.org/10.2973/odp.proc.sr.120.161.1992 120-750B DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Dataset 1992 ftpangaea https://doi.org/10.1594/PANGAEA.758092 https://doi.org/10.2973/odp.proc.sr.120.161.1992 2023-01-20T07:32:05Z A well-preserved, diverse sporomorph flora of over 60 species has been found in Cores 120-750B-12W through -14R from the Southern Kerguelen Plateau. Analysis of the flora indicates that the terrestrial sediments overlaying the basaltic basement are late Early Cretaceous in age. Ranges of the sporomorphs in other parts of Gondwana and the morphology and paucity of angiosperm pollen grains confine the age of this section to the early to possibly early middle Albian. The Albian palynomorph assemblages in Hole 750B are composed primarily of fern spores and podocarpaceous pollen, and show most similarity to those from southern Australia. Changes in the flora through time reflect the successional vegetation changes on barren volcanic islands, beginning with high percentages of colonizing ferns and maturing into conifer (podocarp) forests. The flora shows some signs of endemism, which may be a result of the isolated position of the Kerguelen Islands during the Early Cretaceous. This endemism is expressed by high percentages of a distinctive monosulcate pollen species Ashmoripollis woodywisei n.sp. of pteridosperm or cycadophytean origin, and by a thick-walled, monosulcate angiosperm pollen species of the genus Clavatipollenites. The climatic conditions were probably cool to temperate (mean annual temperature approximately 7°-12°C) and humid (annual rainfall >1000 mm), analogous to modern Podocarpus-dominated forests in New Zealand and in South American mountain regions. Dataset Kerguelen Islands PANGAEA - Data Publisher for Earth & Environmental Science Indian Kerguelen Kerguelen Islands New Zealand ENVELOPE(81.239500,81.239500,-57.592000,-57.592000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
120-750B DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
120-750B DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Mohr, Barbara A R Gee, Carole T Early Albian palynoflora of ODP Hole 120-750B |
topic_facet |
120-750B DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
A well-preserved, diverse sporomorph flora of over 60 species has been found in Cores 120-750B-12W through -14R from the Southern Kerguelen Plateau. Analysis of the flora indicates that the terrestrial sediments overlaying the basaltic basement are late Early Cretaceous in age. Ranges of the sporomorphs in other parts of Gondwana and the morphology and paucity of angiosperm pollen grains confine the age of this section to the early to possibly early middle Albian. The Albian palynomorph assemblages in Hole 750B are composed primarily of fern spores and podocarpaceous pollen, and show most similarity to those from southern Australia. Changes in the flora through time reflect the successional vegetation changes on barren volcanic islands, beginning with high percentages of colonizing ferns and maturing into conifer (podocarp) forests. The flora shows some signs of endemism, which may be a result of the isolated position of the Kerguelen Islands during the Early Cretaceous. This endemism is expressed by high percentages of a distinctive monosulcate pollen species Ashmoripollis woodywisei n.sp. of pteridosperm or cycadophytean origin, and by a thick-walled, monosulcate angiosperm pollen species of the genus Clavatipollenites. The climatic conditions were probably cool to temperate (mean annual temperature approximately 7°-12°C) and humid (annual rainfall >1000 mm), analogous to modern Podocarpus-dominated forests in New Zealand and in South American mountain regions. |
format |
Dataset |
author |
Mohr, Barbara A R Gee, Carole T |
author_facet |
Mohr, Barbara A R Gee, Carole T |
author_sort |
Mohr, Barbara A R |
title |
Early Albian palynoflora of ODP Hole 120-750B |
title_short |
Early Albian palynoflora of ODP Hole 120-750B |
title_full |
Early Albian palynoflora of ODP Hole 120-750B |
title_fullStr |
Early Albian palynoflora of ODP Hole 120-750B |
title_full_unstemmed |
Early Albian palynoflora of ODP Hole 120-750B |
title_sort |
early albian palynoflora of odp hole 120-750b |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.758092 https://doi.org/10.1594/PANGAEA.758092 |
op_coverage |
LATITUDE: -57.592000 * LONGITUDE: 81.239500 * DATE/TIME START: 1988-04-20T05:00:00 * DATE/TIME END: 1988-04-23T04:00:00 |
long_lat |
ENVELOPE(81.239500,81.239500,-57.592000,-57.592000) |
geographic |
Indian Kerguelen Kerguelen Islands New Zealand |
geographic_facet |
Indian Kerguelen Kerguelen Islands New Zealand |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
Supplement to: Mohr, Barbara A R; Gee, Carole T (1992): An early Albian palynoflora from the Kerguelen Plateau, Southern Indian Ocean (Leg 120). In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 255-271, https://doi.org/10.2973/odp.proc.sr.120.161.1992 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.758092 https://doi.org/10.1594/PANGAEA.758092 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.758092 https://doi.org/10.2973/odp.proc.sr.120.161.1992 |
_version_ |
1766055352433901568 |