PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN
The distribution of biogenic silica in pelagic sediment enables us to demonstrate that the Central American isthmus shoaled from 35 to 15 MA, gradually stopping the transfer of dissolved silica in intermediate ocean water into the Caribbean. Between 15 and 4.2 MA it continued to shoal, but during...
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ftunivmilriv:oai:ojs.riviste.unimi.it:article/9031 2023-12-31T10:09:19+01:00 PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN DONNELLY, THOMAS W. 1990-08-31 application/pdf https://riviste.unimi.it/index.php/RIPS/article/view/9031 https://doi.org/10.13130/2039-4942/9031 eng eng Milano University Press https://riviste.unimi.it/index.php/RIPS/article/view/9031/8576 https://riviste.unimi.it/index.php/RIPS/article/view/9031 doi:10.13130/2039-4942/9031 Copyright (c) 2017 THOMAS W. DONNELLY RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA Vol. 96 No. 2-3 (1990) Rivista italiana di Paleontologia e Stratigrafia; V. 96 N. 2-3 (1990) 2039-4942 0035-6883 Pelagic sediment Biogenic silica Central American isthmus Tectonic history info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1990 ftunivmilriv https://doi.org/10.13130/2039-4942/9031 2023-12-05T23:14:14Z The distribution of biogenic silica in pelagic sediment enables us to demonstrate that the Central American isthmus shoaled from 35 to 15 MA, gradually stopping the transfer of dissolved silica in intermediate ocean water into the Caribbean. Between 15 and 4.2 MA it continued to shoal, but during this interval the effective transfer of silica had ceased. A barrier existed at 40 MA between the west Atlantic and the Caribbean, probably on the site of the present Lesser Antilles - Aves Ridge. This barrier prevented the transfer of silica to the western Atlantic at the time of the removal of Atlantic intermediate and deep water silica by the newly formed North Atlantic Deep Water (NADW). The barrier was breached at about 19 MA, enabling silica from the Caribbean to penetrate at least to a few hundred km east of the Lesser Antilles (Site 543 DSDP). Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic University of Milan: Riviste UNIMI |
institution |
Open Polar |
collection |
University of Milan: Riviste UNIMI |
op_collection_id |
ftunivmilriv |
language |
English |
topic |
Pelagic sediment Biogenic silica Central American isthmus Tectonic history |
spellingShingle |
Pelagic sediment Biogenic silica Central American isthmus Tectonic history DONNELLY, THOMAS W. PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN |
topic_facet |
Pelagic sediment Biogenic silica Central American isthmus Tectonic history |
description |
The distribution of biogenic silica in pelagic sediment enables us to demonstrate that the Central American isthmus shoaled from 35 to 15 MA, gradually stopping the transfer of dissolved silica in intermediate ocean water into the Caribbean. Between 15 and 4.2 MA it continued to shoal, but during this interval the effective transfer of silica had ceased. A barrier existed at 40 MA between the west Atlantic and the Caribbean, probably on the site of the present Lesser Antilles - Aves Ridge. This barrier prevented the transfer of silica to the western Atlantic at the time of the removal of Atlantic intermediate and deep water silica by the newly formed North Atlantic Deep Water (NADW). The barrier was breached at about 19 MA, enabling silica from the Caribbean to penetrate at least to a few hundred km east of the Lesser Antilles (Site 543 DSDP). |
format |
Article in Journal/Newspaper |
author |
DONNELLY, THOMAS W. |
author_facet |
DONNELLY, THOMAS W. |
author_sort |
DONNELLY, THOMAS W. |
title |
PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN |
title_short |
PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN |
title_full |
PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN |
title_fullStr |
PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN |
title_full_unstemmed |
PELAGIC SEDIMENT, DEEP WATER CHEMISTRY, AND TECTONICS: AN APPLICATION OF THE HISTORY OF BIOLOGICAL SEDIMENT ACCUMULATION ON THE TECTONIC HISTORY OF THE CARIBBEAN |
title_sort |
pelagic sediment, deep water chemistry, and tectonics: an application of the history of biological sediment accumulation on the tectonic history of the caribbean |
publisher |
Milano University Press |
publishDate |
1990 |
url |
https://riviste.unimi.it/index.php/RIPS/article/view/9031 https://doi.org/10.13130/2039-4942/9031 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA Vol. 96 No. 2-3 (1990) Rivista italiana di Paleontologia e Stratigrafia; V. 96 N. 2-3 (1990) 2039-4942 0035-6883 |
op_relation |
https://riviste.unimi.it/index.php/RIPS/article/view/9031/8576 https://riviste.unimi.it/index.php/RIPS/article/view/9031 doi:10.13130/2039-4942/9031 |
op_rights |
Copyright (c) 2017 THOMAS W. DONNELLY |
op_doi |
https://doi.org/10.13130/2039-4942/9031 |
_version_ |
1786842399017795584 |