Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean
Talc-rich rocks covered by Fe-Mn coatings were recovered from the St. Paul F.Z. (00°37’S-25°34’W, equatorialAtlantic) and Conrad F.Z. (55°29’S-02°05’W, American-Antarctic Ridge). In both occurrences, the talc-rich rocks are associatedwith serpentinized peridotites, gabbroic rocks and minor basalts....
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ftunivmodena:oai:iris.unimore.it:11380/583638 2024-04-14T08:03:20+00:00 Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean DORAZIO M BOSCHI C BRUNELLI, Daniele Dorazio, M Boschi, C Brunelli, Daniele 2004 STAMPA http://hdl.handle.net/11380/583638 https://doi.org/10.1127/0935-1221/2004/0016-0073 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000189157600007 volume:16 issue:1 firstpage:73 lastpage:83 journal:EUROPEAN JOURNAL OF MINERALOGY http://hdl.handle.net/11380/583638 doi:10.1127/0935-1221/2004/0016-0073 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-1542505702 talc low temperature hydrothermal system Mid Ocean Ridge serpentinization St. Paul fracture zone Conrad fracture zone info:eu-repo/semantics/article 2004 ftunivmodena https://doi.org/10.1127/0935-1221/2004/0016-0073 2024-03-21T17:37:35Z Talc-rich rocks covered by Fe-Mn coatings were recovered from the St. Paul F.Z. (00°37’S-25°34’W, equatorialAtlantic) and Conrad F.Z. (55°29’S-02°05’W, American-Antarctic Ridge). In both occurrences, the talc-rich rocks are associatedwith serpentinized peridotites, gabbroic rocks and minor basalts. The two rocks have very similar trace element, particularly rareearth element, distributions. The St. Paul F.Z. samples are breccias consisting of angular clasts of botryoidal/colloform talc in asubordinate foraminiferal ooze sediment. These breccias probably formed by the collapse of fragile structures formed by theprecipitation of talc at hydrothermal vents. Talc formed when seawater mixed with hydrothermal fluids from a mafic-ultramaficreaction zone. The talc-rich hydrothermal rock found at the Conrad F.Z. shows evidence of a replacement origin. We suggest theprotolith was a gabbroic rock that underwent multi-stage hydrothermal alteration, possibly in a shear zone.These two occurrences represent an evidence of off-axis ocean floor hydrothermal activity, and the study of similar, apparentlyminor, products collected by dredging could be used to reveal the presence of hydrothermal systems in such impervious settings. Article in Journal/Newspaper Antarc* Antarctic Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS) Antarctic Conrad Fracture Zone ENVELOPE(-4.000,-4.000,-56.000,-56.000) European Journal of Mineralogy 16 1 73 83 |
institution |
Open Polar |
collection |
Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS) |
op_collection_id |
ftunivmodena |
language |
English |
topic |
talc low temperature hydrothermal system Mid Ocean Ridge serpentinization St. Paul fracture zone Conrad fracture zone |
spellingShingle |
talc low temperature hydrothermal system Mid Ocean Ridge serpentinization St. Paul fracture zone Conrad fracture zone DORAZIO M BOSCHI C BRUNELLI, Daniele Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean |
topic_facet |
talc low temperature hydrothermal system Mid Ocean Ridge serpentinization St. Paul fracture zone Conrad fracture zone |
description |
Talc-rich rocks covered by Fe-Mn coatings were recovered from the St. Paul F.Z. (00°37’S-25°34’W, equatorialAtlantic) and Conrad F.Z. (55°29’S-02°05’W, American-Antarctic Ridge). In both occurrences, the talc-rich rocks are associatedwith serpentinized peridotites, gabbroic rocks and minor basalts. The two rocks have very similar trace element, particularly rareearth element, distributions. The St. Paul F.Z. samples are breccias consisting of angular clasts of botryoidal/colloform talc in asubordinate foraminiferal ooze sediment. These breccias probably formed by the collapse of fragile structures formed by theprecipitation of talc at hydrothermal vents. Talc formed when seawater mixed with hydrothermal fluids from a mafic-ultramaficreaction zone. The talc-rich hydrothermal rock found at the Conrad F.Z. shows evidence of a replacement origin. We suggest theprotolith was a gabbroic rock that underwent multi-stage hydrothermal alteration, possibly in a shear zone.These two occurrences represent an evidence of off-axis ocean floor hydrothermal activity, and the study of similar, apparentlyminor, products collected by dredging could be used to reveal the presence of hydrothermal systems in such impervious settings. |
author2 |
Dorazio, M Boschi, C Brunelli, Daniele |
format |
Article in Journal/Newspaper |
author |
DORAZIO M BOSCHI C BRUNELLI, Daniele |
author_facet |
DORAZIO M BOSCHI C BRUNELLI, Daniele |
author_sort |
DORAZIO M |
title |
Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean |
title_short |
Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean |
title_full |
Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean |
title_fullStr |
Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean |
title_full_unstemmed |
Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean |
title_sort |
talc-rich hydrothermal rocks from the st. paul and conrad fracture zones in the atlantic ocean |
publishDate |
2004 |
url |
http://hdl.handle.net/11380/583638 https://doi.org/10.1127/0935-1221/2004/0016-0073 |
long_lat |
ENVELOPE(-4.000,-4.000,-56.000,-56.000) |
geographic |
Antarctic Conrad Fracture Zone |
geographic_facet |
Antarctic Conrad Fracture Zone |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000189157600007 volume:16 issue:1 firstpage:73 lastpage:83 journal:EUROPEAN JOURNAL OF MINERALOGY http://hdl.handle.net/11380/583638 doi:10.1127/0935-1221/2004/0016-0073 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-1542505702 |
op_doi |
https://doi.org/10.1127/0935-1221/2004/0016-0073 |
container_title |
European Journal of Mineralogy |
container_volume |
16 |
container_issue |
1 |
container_start_page |
73 |
op_container_end_page |
83 |
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1796299589454659584 |