Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies
International audience Geochemical proxies in marine sediment archives are often utilized to reconstruct changes in paleoenvironmental conditions. Understanding the role of the corresponding modern deep biosphere associated with sediments and the impacts these microbial communities have on the geoch...
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ftunivbrest:oai:HAL:hal-03863893v1 2024-02-11T10:05:06+01:00 Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies Lindsay, Melody Baker, Elizabeth LeVay, Leah Percuoco, Vincent Suhonen, Johanna Smith, Catherine Crowder, Lisa Kachovich, Sarah Mateo, Zenon Moortgat, Eric Samoila, Ionela Briais, Anne Parnell-Turner, Ross Dodd, Justin Orcutt, Beth Bigelow Laboratory for Ocean Sciences Bowdoin College Brunswick Texas A&M University College Station Geo-Ocean (GEO-OCEAN) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Northern Illinois University Online, United States 2022-02-24 https://hal.science/hal-03863893 en eng HAL CCSD hal-03863893 https://hal.science/hal-03863893 Ocean Sciences Meeting 2022 https://hal.science/hal-03863893 Ocean Sciences Meeting 2022, Feb 2022, Online, United States osm2022.secure-platform.com/a/gallery/rounds/3/details/2288 [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy info:eu-repo/semantics/conferenceObject Conference papers 2022 ftunivbrest 2024-01-16T23:37:02Z International audience Geochemical proxies in marine sediment archives are often utilized to reconstruct changes in paleoenvironmental conditions. Understanding the role of the corresponding modern deep biosphere associated with sediments and the impacts these microbial communities have on the geochemistry enhance our ability to reconstruct past changes in ocean circulation. Additionally, in sedimentary systems where basalts of different ages, composition, and alteration interact with the deep biosphere, fluid-rock interactions my result in additional hydrothermal alteration of sediment-based geochemical proxies. Here, we present geochemical data collected during IODP Expedition 395C to analyze the diffusive transfer of ions between basement and sediment in several drill sites within the Mid-Atlantic Ridge/Reykjanes Ridge and Iceland hotspot interaction system. Through observed changes in gradient profiles of redox sensitive compounds (e.g. SO4, which is highest at the seawater-sediment interface and at the sediment-basement interface, and CH4 which varies between sample sites) and other ions as a measure of conservative exchange, crustal fluid conditions are extrapolated and compared to other ridge-flank upper oceanic crust ecosystems. Total organic carbon and cell biomass in sediment samples provide a window into patterns in deep biosphere communities associated with sedimentation changes. Cell biomass contained within basement basalt tracks variability in hydrothermal fluid circulation and resulting basalt alteration. The distribution of sites along a transect spanning the Mid-Atlantic Ridge and Iceland hotspot interaction system presents a unique interdisciplinary look at evidence for diffusion of solutes across the basalt-sediment interface and provides a means to quantify deep subsurface biomass in a range of off-axis hydrothermal settings. Conference Object Iceland Université de Bretagne Occidentale: HAL Mid-Atlantic Ridge Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Lindsay, Melody Baker, Elizabeth LeVay, Leah Percuoco, Vincent Suhonen, Johanna Smith, Catherine Crowder, Lisa Kachovich, Sarah Mateo, Zenon Moortgat, Eric Samoila, Ionela Briais, Anne Parnell-Turner, Ross Dodd, Justin Orcutt, Beth Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
description |
International audience Geochemical proxies in marine sediment archives are often utilized to reconstruct changes in paleoenvironmental conditions. Understanding the role of the corresponding modern deep biosphere associated with sediments and the impacts these microbial communities have on the geochemistry enhance our ability to reconstruct past changes in ocean circulation. Additionally, in sedimentary systems where basalts of different ages, composition, and alteration interact with the deep biosphere, fluid-rock interactions my result in additional hydrothermal alteration of sediment-based geochemical proxies. Here, we present geochemical data collected during IODP Expedition 395C to analyze the diffusive transfer of ions between basement and sediment in several drill sites within the Mid-Atlantic Ridge/Reykjanes Ridge and Iceland hotspot interaction system. Through observed changes in gradient profiles of redox sensitive compounds (e.g. SO4, which is highest at the seawater-sediment interface and at the sediment-basement interface, and CH4 which varies between sample sites) and other ions as a measure of conservative exchange, crustal fluid conditions are extrapolated and compared to other ridge-flank upper oceanic crust ecosystems. Total organic carbon and cell biomass in sediment samples provide a window into patterns in deep biosphere communities associated with sedimentation changes. Cell biomass contained within basement basalt tracks variability in hydrothermal fluid circulation and resulting basalt alteration. The distribution of sites along a transect spanning the Mid-Atlantic Ridge and Iceland hotspot interaction system presents a unique interdisciplinary look at evidence for diffusion of solutes across the basalt-sediment interface and provides a means to quantify deep subsurface biomass in a range of off-axis hydrothermal settings. |
author2 |
Bigelow Laboratory for Ocean Sciences Bowdoin College Brunswick Texas A&M University College Station Geo-Ocean (GEO-OCEAN) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Northern Illinois University |
format |
Conference Object |
author |
Lindsay, Melody Baker, Elizabeth LeVay, Leah Percuoco, Vincent Suhonen, Johanna Smith, Catherine Crowder, Lisa Kachovich, Sarah Mateo, Zenon Moortgat, Eric Samoila, Ionela Briais, Anne Parnell-Turner, Ross Dodd, Justin Orcutt, Beth |
author_facet |
Lindsay, Melody Baker, Elizabeth LeVay, Leah Percuoco, Vincent Suhonen, Johanna Smith, Catherine Crowder, Lisa Kachovich, Sarah Mateo, Zenon Moortgat, Eric Samoila, Ionela Briais, Anne Parnell-Turner, Ross Dodd, Justin Orcutt, Beth |
author_sort |
Lindsay, Melody |
title |
Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies |
title_short |
Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies |
title_full |
Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies |
title_fullStr |
Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies |
title_full_unstemmed |
Tracking hydrothermal alteration and sedimentation in Reykjanes Ridge basement and sediment through geochemical and microbiological proxies |
title_sort |
tracking hydrothermal alteration and sedimentation in reykjanes ridge basement and sediment through geochemical and microbiological proxies |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03863893 |
op_coverage |
Online, United States |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Mid-Atlantic Ridge Reykjanes |
geographic_facet |
Mid-Atlantic Ridge Reykjanes |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Ocean Sciences Meeting 2022 https://hal.science/hal-03863893 Ocean Sciences Meeting 2022, Feb 2022, Online, United States osm2022.secure-platform.com/a/gallery/rounds/3/details/2288 |
op_relation |
hal-03863893 https://hal.science/hal-03863893 |
_version_ |
1790601947381760000 |