Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records
International audience We have collected 41 sediment samples from the depths of about 2000 m and 4000 m in the Nankai Trough area using the submersible Nautile. Study of these samples has enabled recognition of two main preservation states of planktonic and benthic foraminiferal tests: dissolution i...
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ftmuseumnhn:oai:HAL:hal-03285279v1 2023-07-30T04:06:25+02:00 Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records Vénec-Peyré, Marie-Thérèse Boulègue, Jacques Lallemand, Serge Muséum national d'Histoire naturelle (MNHN) Laboratoire de Géochimie et Métallogénie Université Pierre et Marie Curie - Paris 6 (UPMC) Laboratoire de Géologie Structurale 1992 https://hal.science/hal-03285279 en eng HAL CCSD Elsevier hal-03285279 https://hal.science/hal-03285279 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-03285279 Earth and Planetary Science Letters, 1992, 109, pp.405-417 [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 1992 ftmuseumnhn 2023-07-08T20:24:18Z International audience We have collected 41 sediment samples from the depths of about 2000 m and 4000 m in the Nankai Trough area using the submersible Nautile. Study of these samples has enabled recognition of two main preservation states of planktonic and benthic foraminiferal tests: dissolution in all the samples and superimposed encrustation in some of them. The distributional pattern of planktonic foraminifera reveals a strong rate of dissolution of the tests. Among the benthic foraminifers, the aragonitic species Hoeglundina elegans shows, below 2000 m, a corrosion of test surfaces, removing parts of growth layers, and breakage of last chambers. On the basis of pore water chemistry the high rates of dissolution are related to unusual aragonite undersaturation in pore water at the sediment-water interface and to expulsion of pore water in open sea water. Furthermore, a peculiar etching of the whole test of 11. elegans and encrusted calcitic tests are observed, but only in the samples collected near fluid venting manifestations (clams, worms, and "shell concretions"), suggesting a possible relationship between diagenesis and fluids. Article in Journal/Newspaper Planktonic foraminifera Muséum National d'Histoire Naturelle (MNHM): HAL |
institution |
Open Polar |
collection |
Muséum National d'Histoire Naturelle (MNHM): HAL |
op_collection_id |
ftmuseumnhn |
language |
English |
topic |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Vénec-Peyré, Marie-Thérèse Boulègue, Jacques Lallemand, Serge Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records |
topic_facet |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience We have collected 41 sediment samples from the depths of about 2000 m and 4000 m in the Nankai Trough area using the submersible Nautile. Study of these samples has enabled recognition of two main preservation states of planktonic and benthic foraminiferal tests: dissolution in all the samples and superimposed encrustation in some of them. The distributional pattern of planktonic foraminifera reveals a strong rate of dissolution of the tests. Among the benthic foraminifers, the aragonitic species Hoeglundina elegans shows, below 2000 m, a corrosion of test surfaces, removing parts of growth layers, and breakage of last chambers. On the basis of pore water chemistry the high rates of dissolution are related to unusual aragonite undersaturation in pore water at the sediment-water interface and to expulsion of pore water in open sea water. Furthermore, a peculiar etching of the whole test of 11. elegans and encrusted calcitic tests are observed, but only in the samples collected near fluid venting manifestations (clams, worms, and "shell concretions"), suggesting a possible relationship between diagenesis and fluids. |
author2 |
Muséum national d'Histoire naturelle (MNHN) Laboratoire de Géochimie et Métallogénie Université Pierre et Marie Curie - Paris 6 (UPMC) Laboratoire de Géologie Structurale |
format |
Article in Journal/Newspaper |
author |
Vénec-Peyré, Marie-Thérèse Boulègue, Jacques Lallemand, Serge |
author_facet |
Vénec-Peyré, Marie-Thérèse Boulègue, Jacques Lallemand, Serge |
author_sort |
Vénec-Peyré, Marie-Thérèse |
title |
Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records |
title_short |
Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records |
title_full |
Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records |
title_fullStr |
Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records |
title_full_unstemmed |
Vent activity in a subduction area (Nankai wedge) : The foraminiferal test records |
title_sort |
vent activity in a subduction area (nankai wedge) : the foraminiferal test records |
publisher |
HAL CCSD |
publishDate |
1992 |
url |
https://hal.science/hal-03285279 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-03285279 Earth and Planetary Science Letters, 1992, 109, pp.405-417 |
op_relation |
hal-03285279 https://hal.science/hal-03285279 |
_version_ |
1772819013456363520 |