Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology
To better understand the paleoenvironments of the lower-middle Santonian, dinocyst data were obtained from the Santa Marta Formation, Larsen Basin, James Ross Island, Antarctic Peninsula. This study provides the first available quantitative dinocyst data for the Santa Marta Formation, which should m...
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ftdoajarticles:oai:doaj.org/article:6aaa66bcdefa482e8131efc3468a6663 2023-05-15T13:47:11+02:00 Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology SUSAN P. CASTRO MARCELO A. CARVALHO 2015-09-01T00:00:00Z https://doi.org/10.1590/0001-3765201520140651 https://doaj.org/article/6aaa66bcdefa482e8131efc3468a6663 EN eng Academia Brasileira de Ciências http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401583&lng=en&tlng=en https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765201520140651 https://doaj.org/article/6aaa66bcdefa482e8131efc3468a6663 Anais da Academia Brasileira de Ciências, Vol 87, Iss 3, Pp 1583-1597 (2015) Dinocistos santonianos Antártica Cretáceo Formação Santa Marta florações de dinocistos Science Q article 2015 ftdoajarticles https://doi.org/10.1590/0001-3765201520140651 2022-12-31T04:31:20Z To better understand the paleoenvironments of the lower-middle Santonian, dinocyst data were obtained from the Santa Marta Formation, Larsen Basin, James Ross Island, Antarctic Peninsula. This study provides the first available quantitative dinocyst data for the Santa Marta Formation, which should more clearly reflect detailed changes in paleoenvironments, as recorded by fluctuations in diversity and abundance. To record the Santonian dinocyst assemblages from the Larsen Basin, 30 samples from an outcrop of the Lachman Crags Member (LC section) were analyzed. These assemblages are dominated by peridiniacean dinocysts typical of the Isabelidinium flora. A lower-middle Santonian age was determined after the recognition of Odontochitina poriferaand Isabelidinium cretaceum zones. Cluster analysis based on quantitative data, yielded five dinocyst assemblages: Manumiella, Heterosphaeridium, Chlamydophorella, Isabelidinium and Odontochitina. Two Santonian blooms, Isabelidinium and Odontochitina,recognized in other regions were also recorded in the studied section. The stratigraphic distribution shows an alternation between the assemblages, distinguishing in the section six intervals. The high abundance of the Manumiella assemblage at the uppermost interval of the section represents the shallower setting, whereas the high abundance of Odontochitina at the middle part of the section represents the deepest setting. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antártica James Ross Island Ross Island Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Ross Island Larsen Basin ENVELOPE(-60.000,-60.000,-68.000,-68.000) Lachman ENVELOPE(-57.781,-57.781,-63.780,-63.780) Lachman Crags ENVELOPE(-57.832,-57.832,-63.874,-63.874) Anais da Academia Brasileira de Ciências 87 3 1583 1597 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Dinocistos santonianos Antártica Cretáceo Formação Santa Marta florações de dinocistos Science Q |
spellingShingle |
Dinocistos santonianos Antártica Cretáceo Formação Santa Marta florações de dinocistos Science Q SUSAN P. CASTRO MARCELO A. CARVALHO Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology |
topic_facet |
Dinocistos santonianos Antártica Cretáceo Formação Santa Marta florações de dinocistos Science Q |
description |
To better understand the paleoenvironments of the lower-middle Santonian, dinocyst data were obtained from the Santa Marta Formation, Larsen Basin, James Ross Island, Antarctic Peninsula. This study provides the first available quantitative dinocyst data for the Santa Marta Formation, which should more clearly reflect detailed changes in paleoenvironments, as recorded by fluctuations in diversity and abundance. To record the Santonian dinocyst assemblages from the Larsen Basin, 30 samples from an outcrop of the Lachman Crags Member (LC section) were analyzed. These assemblages are dominated by peridiniacean dinocysts typical of the Isabelidinium flora. A lower-middle Santonian age was determined after the recognition of Odontochitina poriferaand Isabelidinium cretaceum zones. Cluster analysis based on quantitative data, yielded five dinocyst assemblages: Manumiella, Heterosphaeridium, Chlamydophorella, Isabelidinium and Odontochitina. Two Santonian blooms, Isabelidinium and Odontochitina,recognized in other regions were also recorded in the studied section. The stratigraphic distribution shows an alternation between the assemblages, distinguishing in the section six intervals. The high abundance of the Manumiella assemblage at the uppermost interval of the section represents the shallower setting, whereas the high abundance of Odontochitina at the middle part of the section represents the deepest setting. |
format |
Article in Journal/Newspaper |
author |
SUSAN P. CASTRO MARCELO A. CARVALHO |
author_facet |
SUSAN P. CASTRO MARCELO A. CARVALHO |
author_sort |
SUSAN P. CASTRO |
title |
Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology |
title_short |
Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology |
title_full |
Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology |
title_fullStr |
Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology |
title_full_unstemmed |
Santonian dinocyst assemblages of the Santa Marta Formation, Antarctic Peninsula: Inferences for paleoenvironments and paleoecology |
title_sort |
santonian dinocyst assemblages of the santa marta formation, antarctic peninsula: inferences for paleoenvironments and paleoecology |
publisher |
Academia Brasileira de Ciências |
publishDate |
2015 |
url |
https://doi.org/10.1590/0001-3765201520140651 https://doaj.org/article/6aaa66bcdefa482e8131efc3468a6663 |
long_lat |
ENVELOPE(-60.000,-60.000,-68.000,-68.000) ENVELOPE(-57.781,-57.781,-63.780,-63.780) ENVELOPE(-57.832,-57.832,-63.874,-63.874) |
geographic |
Antarctic Antarctic Peninsula Ross Island Larsen Basin Lachman Lachman Crags |
geographic_facet |
Antarctic Antarctic Peninsula Ross Island Larsen Basin Lachman Lachman Crags |
genre |
Antarc* Antarctic Antarctic Peninsula Antártica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antártica James Ross Island Ross Island |
op_source |
Anais da Academia Brasileira de Ciências, Vol 87, Iss 3, Pp 1583-1597 (2015) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401583&lng=en&tlng=en https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765201520140651 https://doaj.org/article/6aaa66bcdefa482e8131efc3468a6663 |
op_doi |
https://doi.org/10.1590/0001-3765201520140651 |
container_title |
Anais da Academia Brasileira de Ciências |
container_volume |
87 |
container_issue |
3 |
container_start_page |
1583 |
op_container_end_page |
1597 |
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1766246746841677824 |