Geochemistry of Atlantis Massif serpentinites
The Lost City hydrothermal system at the southern Atlantis Massif (Mid-Atlantic Ridge, 30°N) provides a natural laboratory for studying serpentinization processes, the temporal evolution of ultramafic-hosted hydrothermal systems, and alteration conditions during formation and emplacement of an ocean...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2008
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.783782 https://doi.org/10.1594/PANGAEA.783782 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.783782 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.783782 2023-05-15T17:37:02+02:00 Geochemistry of Atlantis Massif serpentinites Boschi, Chiara Dini, Andrea Frueh-Green, Gretchen L Kelley, Deborah S MEDIAN LATITUDE: 30.119577 * MEDIAN LONGITUDE: -42.107129 * SOUTH-BOUND LATITUDE: 30.080800 * WEST-BOUND LONGITUDE: -42.140100 * NORTH-BOUND LATITUDE: 30.171600 * EAST-BOUND LONGITUDE: -42.061700 * DATE/TIME START: 2000-11-22T00:00:00 * DATE/TIME END: 2003-05-15T00:00:00 2008-06-07 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.783782 https://doi.org/10.1594/PANGAEA.783782 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.783782 https://doi.org/10.1594/PANGAEA.783782 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Boschi, Chiara; Dini, Andrea; Frueh-Green, Gretchen L; Kelley, Deborah S (2008): Isotopic and element exchange during serpentinization and metasomatism at the Atlantis Massif (MAR 30°N): Insights from B and Sr isotope data. Geochimica et Cosmochimica Acta, 72(7), 1801-1823, https://doi.org/10.1016/j.gca.2008.01.013 ALV-3639 ALV-3642 ALV-3645 ALV-3646 ALV-3647 ALV-3648 ALV-3649 ALV-3651 ALV-3652 ALV-3863 ALV-3865 ALV-3867 ALV-3872 ALV-3873 ALV-3876 ALV-3877 ALV-3880 ALV-3881 ALVIN AT03-60 AT03-60_D3 AT03-60_D4 AT07-34 Atlantis (1997) Dredge DRG Marvel North Atlantic Submersible Alvin Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.783782 https://doi.org/10.1016/j.gca.2008.01.013 2023-01-20T07:32:34Z The Lost City hydrothermal system at the southern Atlantis Massif (Mid-Atlantic Ridge, 30°N) provides a natural laboratory for studying serpentinization processes, the temporal evolution of ultramafic-hosted hydrothermal systems, and alteration conditions during formation and emplacement of an oceanic core complex. Here we present B, O, and Sr isotope data to investigate fluid/rock interaction and mass transfer during detachment faulting and exhumation of lithospheric sequences within the Atlantis Massif. Our data indicate that extensive serpentinization was a seawater-dominated process that occurred predominately at temperatures of 150-250 °C and at high integrated W/R ratios that led to a marked boron enrichment (34-91 ppm). Boron removal from seawater during serpentinization is positively correlated with changes in d11B (11-16 per mil) but shows no correlation with O-isotope composition. Modeling indicates that B concentrations and isotope values of the serpentinites are controlled by transient temperature-pH conditions. In contrast to prior studies, we conclude that low-temperature marine weathering processes are insignificant for boron geochemistry of the Atlantis Massif serpentinites. Talc- and amphibole-rich fault rocks formed within a zone of detachment faulting at temperatures of approximately 270-350 °C and at low W/R ratios. Talc formation in ultramafic domains in the massif was subsequent to an early stage of serpentinization and was controlled by the access of Si-rich fluids derived through seawater-gabbro interactions. Replacement of serpentine by talc resulted in boron loss and significant lowering of d11B values (9-10 per mil), which we model as the product of progressive extraction of boron. Our study provides new constraints on the boron geochemical cycle at oceanic spreading ridges and suggests that serpentinization associated with ultramafic-hosted hydrothermal systems may have important implications for the behavior of boron in subduction zone settings. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Mid-Atlantic Ridge Marvel ENVELOPE(159.367,159.367,-78.750,-78.750) ENVELOPE(-42.140100,-42.061700,30.171600,30.080800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ALV-3639 ALV-3642 ALV-3645 ALV-3646 ALV-3647 ALV-3648 ALV-3649 ALV-3651 ALV-3652 ALV-3863 ALV-3865 ALV-3867 ALV-3872 ALV-3873 ALV-3876 ALV-3877 ALV-3880 ALV-3881 ALVIN AT03-60 AT03-60_D3 AT03-60_D4 AT07-34 Atlantis (1997) Dredge DRG Marvel North Atlantic Submersible Alvin |
spellingShingle |
ALV-3639 ALV-3642 ALV-3645 ALV-3646 ALV-3647 ALV-3648 ALV-3649 ALV-3651 ALV-3652 ALV-3863 ALV-3865 ALV-3867 ALV-3872 ALV-3873 ALV-3876 ALV-3877 ALV-3880 ALV-3881 ALVIN AT03-60 AT03-60_D3 AT03-60_D4 AT07-34 Atlantis (1997) Dredge DRG Marvel North Atlantic Submersible Alvin Boschi, Chiara Dini, Andrea Frueh-Green, Gretchen L Kelley, Deborah S Geochemistry of Atlantis Massif serpentinites |
topic_facet |
ALV-3639 ALV-3642 ALV-3645 ALV-3646 ALV-3647 ALV-3648 ALV-3649 ALV-3651 ALV-3652 ALV-3863 ALV-3865 ALV-3867 ALV-3872 ALV-3873 ALV-3876 ALV-3877 ALV-3880 ALV-3881 ALVIN AT03-60 AT03-60_D3 AT03-60_D4 AT07-34 Atlantis (1997) Dredge DRG Marvel North Atlantic Submersible Alvin |
description |
The Lost City hydrothermal system at the southern Atlantis Massif (Mid-Atlantic Ridge, 30°N) provides a natural laboratory for studying serpentinization processes, the temporal evolution of ultramafic-hosted hydrothermal systems, and alteration conditions during formation and emplacement of an oceanic core complex. Here we present B, O, and Sr isotope data to investigate fluid/rock interaction and mass transfer during detachment faulting and exhumation of lithospheric sequences within the Atlantis Massif. Our data indicate that extensive serpentinization was a seawater-dominated process that occurred predominately at temperatures of 150-250 °C and at high integrated W/R ratios that led to a marked boron enrichment (34-91 ppm). Boron removal from seawater during serpentinization is positively correlated with changes in d11B (11-16 per mil) but shows no correlation with O-isotope composition. Modeling indicates that B concentrations and isotope values of the serpentinites are controlled by transient temperature-pH conditions. In contrast to prior studies, we conclude that low-temperature marine weathering processes are insignificant for boron geochemistry of the Atlantis Massif serpentinites. Talc- and amphibole-rich fault rocks formed within a zone of detachment faulting at temperatures of approximately 270-350 °C and at low W/R ratios. Talc formation in ultramafic domains in the massif was subsequent to an early stage of serpentinization and was controlled by the access of Si-rich fluids derived through seawater-gabbro interactions. Replacement of serpentine by talc resulted in boron loss and significant lowering of d11B values (9-10 per mil), which we model as the product of progressive extraction of boron. Our study provides new constraints on the boron geochemical cycle at oceanic spreading ridges and suggests that serpentinization associated with ultramafic-hosted hydrothermal systems may have important implications for the behavior of boron in subduction zone settings. |
format |
Dataset |
author |
Boschi, Chiara Dini, Andrea Frueh-Green, Gretchen L Kelley, Deborah S |
author_facet |
Boschi, Chiara Dini, Andrea Frueh-Green, Gretchen L Kelley, Deborah S |
author_sort |
Boschi, Chiara |
title |
Geochemistry of Atlantis Massif serpentinites |
title_short |
Geochemistry of Atlantis Massif serpentinites |
title_full |
Geochemistry of Atlantis Massif serpentinites |
title_fullStr |
Geochemistry of Atlantis Massif serpentinites |
title_full_unstemmed |
Geochemistry of Atlantis Massif serpentinites |
title_sort |
geochemistry of atlantis massif serpentinites |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.783782 https://doi.org/10.1594/PANGAEA.783782 |
op_coverage |
MEDIAN LATITUDE: 30.119577 * MEDIAN LONGITUDE: -42.107129 * SOUTH-BOUND LATITUDE: 30.080800 * WEST-BOUND LONGITUDE: -42.140100 * NORTH-BOUND LATITUDE: 30.171600 * EAST-BOUND LONGITUDE: -42.061700 * DATE/TIME START: 2000-11-22T00:00:00 * DATE/TIME END: 2003-05-15T00:00:00 |
long_lat |
ENVELOPE(159.367,159.367,-78.750,-78.750) ENVELOPE(-42.140100,-42.061700,30.171600,30.080800) |
geographic |
Mid-Atlantic Ridge Marvel |
geographic_facet |
Mid-Atlantic Ridge Marvel |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Boschi, Chiara; Dini, Andrea; Frueh-Green, Gretchen L; Kelley, Deborah S (2008): Isotopic and element exchange during serpentinization and metasomatism at the Atlantis Massif (MAR 30°N): Insights from B and Sr isotope data. Geochimica et Cosmochimica Acta, 72(7), 1801-1823, https://doi.org/10.1016/j.gca.2008.01.013 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.783782 https://doi.org/10.1594/PANGAEA.783782 |
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.783782 https://doi.org/10.1016/j.gca.2008.01.013 |
_version_ |
1766136752261562368 |