Serpentinization and carbon sequestration: A study of two ancient peridotite-hosted hydrothermal systems
Fluid circulation in peridotite-hosted hydrothermal systems influences the incorporation of carbon into the oceanic crust and its long-term storage. At low to moderate temperatures, serpentinization of peridotite produces alkaline fluids that are rich in CH4 and H2. Upon mixing with seawater, these...
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| creator | Schwarzenbach, Esther M. Früh-Green, Gretchen L. Bernasconi, Stefano M. Alt, Jeffrey C. Plas, Alessio |
| description | Fluid circulation in peridotite-hosted hydrothermal systems influences the incorporation of carbon into the oceanic crust and its long-term storage. At low to moderate temperatures, serpentinization of peridotite produces alkaline fluids that are rich in CH4 and H2. Upon mixing with seawater, these fluids precipitate carbonate, forming an extensive network of calcite veins in the basement rocks, while H2 and CH4 serve as an energy source for microorganisms. Here, we analyzed the carbon geochemistry of two ancient peridotite-hosted hydrothermal systems: 1) ophiolites cropping out in the Northern Apennines, and 2) calcite-veined serpentinites from the Iberian Margin (Ocean Drilling Program (ODP) Legs 149 and 173), and compare them to active peridotite-hosted hydrothermal systems such as the Lost City hydrothermal field (LCHF) on the Atlantis Massif near the Mid-Atlantic Ridge (MAR).
Our results show that large amounts of carbonate are formed during serpentinization of mantle rocks exposed on the seafloor (up to 9.6wt.% C in ophicalcites) and that carbon incorporation decreases with depth. In the Northern Apennine serpentinites, serpentinization temperatures decrease from 240°C to |
| doi_str_mv | 10.1016/j.chemgeo.2013.05.016 |
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Our results show that large amounts of carbonate are formed during serpentinization of mantle rocks exposed on the seafloor (up to 9.6wt.% C in ophicalcites) and that carbon incorporation decreases with depth. In the Northern Apennine serpentinites, serpentinization temperatures decrease from 240°C to <150°C, while carbonates are formed at temperatures decreasing from ~150°C to <50°C. At the Iberian Margin both carbonate formation and serpentinization temperatures are lower than in the Northern Apennines with serpentinization starting at ~150°C, followed by clay alteration at <100°C and carbonate formation at <19–44°C. Comparison with various active peridotite-hosted hydrothermal systems on the MAR shows that the serpentinites from the Northern Apennines record a thermal evolution similar to that of the basement of the LCHF and that tectonic activity on the Jurassic seafloor, comparable to the present-day processes leading to oceanic core complexes, probably led to formation of fractures and faults, which promoted fluid circulation to greater depth and cooling of the mantle rocks. Thus, our study provides further evidence that the Northern Apennine serpentinites host a paleo-stockwork of a hydrothermal system similar to the basement of the LCHF. Furthermore, we argue that the extent of carbonate uptake is mainly controlled by the presence of fluid pathways. Low serpentinization temperatures promote microbial activity, which leads to enhanced biomass formation and the storage of organic carbon. Organic carbon becomes dominant with increasing depth and is the principal carbon phase at more than 50–100m depth of the serpentinite basement at the Iberian Margin. We estimate that annually 1.1 to 2.7×1012g C is stored within peridotites exposed to seawater, of which 30–40% is fixed within the uppermost 20–50m mainly as carbonate. Additionally, we conclude that alteration of oceanic lithosphere is an important factor in the long-term global carbon cycle, having the potential to store carbon for millions of years.
•We compare the carbon geochemistry of peridotite-hosted hydrothermal systems.•The Ligurian ophiolites are likely an ancient analog to the Atlantis Massif.•Up to 2.7×1012g C is stored within peridotites exposed to seawater.•The extent of carbonate uptake is mainly controlled by the presence of fluid pathways.•Serpentinization plays an important role in the long-term global carbon cycle.</description><identifier>ISSN: 0009-2541</identifier><identifier>EISSN: 1872-6836</identifier><identifier>DOI: 10.1016/j.chemgeo.2013.05.016</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Basements ; biomass ; calcite ; Carbon ; Carbon sequestration ; carbon sinks ; Carbonates ; clay ; cooling ; energy ; Fluid dynamics ; Fluid flow ; Fluids ; Formations ; hydrogen ; Hydrothermal systems ; Iberian Margin ; Marine ; methane ; microbial activity ; microorganisms ; mixing ; Northern Apennine ; Ocean Drilling Program ; Ophiolites ; Rocks ; seawater ; serpentinite ; Serpentinization ; tectonics ; temperature</subject><ispartof>Chemical geology, 2013-08, Vol.351, p.115-133</ispartof><rights>2013 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a422t-f8ba5881c0c6132e8392519279be3842668cafb73e546dff22da4b72ae95a44d3</citedby><cites>FETCH-LOGICAL-a422t-f8ba5881c0c6132e8392519279be3842668cafb73e546dff22da4b72ae95a44d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0009254113002222$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Schwarzenbach, Esther M.</creatorcontrib><creatorcontrib>Früh-Green, Gretchen L.</creatorcontrib><creatorcontrib>Bernasconi, Stefano M.</creatorcontrib><creatorcontrib>Alt, Jeffrey C.</creatorcontrib><creatorcontrib>Plas, Alessio</creatorcontrib><title>Serpentinization and carbon sequestration: A study of two ancient peridotite-hosted hydrothermal systems</title><title>Chemical geology</title><description>Fluid circulation in peridotite-hosted hydrothermal systems influences the incorporation of carbon into the oceanic crust and its long-term storage. At low to moderate temperatures, serpentinization of peridotite produces alkaline fluids that are rich in CH4 and H2. Upon mixing with seawater, these fluids precipitate carbonate, forming an extensive network of calcite veins in the basement rocks, while H2 and CH4 serve as an energy source for microorganisms. Here, we analyzed the carbon geochemistry of two ancient peridotite-hosted hydrothermal systems: 1) ophiolites cropping out in the Northern Apennines, and 2) calcite-veined serpentinites from the Iberian Margin (Ocean Drilling Program (ODP) Legs 149 and 173), and compare them to active peridotite-hosted hydrothermal systems such as the Lost City hydrothermal field (LCHF) on the Atlantis Massif near the Mid-Atlantic Ridge (MAR).
Our results show that large amounts of carbonate are formed during serpentinization of mantle rocks exposed on the seafloor (up to 9.6wt.% C in ophicalcites) and that carbon incorporation decreases with depth. In the Northern Apennine serpentinites, serpentinization temperatures decrease from 240°C to <150°C, while carbonates are formed at temperatures decreasing from ~150°C to <50°C. At the Iberian Margin both carbonate formation and serpentinization temperatures are lower than in the Northern Apennines with serpentinization starting at ~150°C, followed by clay alteration at <100°C and carbonate formation at <19–44°C. Comparison with various active peridotite-hosted hydrothermal systems on the MAR shows that the serpentinites from the Northern Apennines record a thermal evolution similar to that of the basement of the LCHF and that tectonic activity on the Jurassic seafloor, comparable to the present-day processes leading to oceanic core complexes, probably led to formation of fractures and faults, which promoted fluid circulation to greater depth and cooling of the mantle rocks. Thus, our study provides further evidence that the Northern Apennine serpentinites host a paleo-stockwork of a hydrothermal system similar to the basement of the LCHF. Furthermore, we argue that the extent of carbonate uptake is mainly controlled by the presence of fluid pathways. Low serpentinization temperatures promote microbial activity, which leads to enhanced biomass formation and the storage of organic carbon. Organic carbon becomes dominant with increasing depth and is the principal carbon phase at more than 50–100m depth of the serpentinite basement at the Iberian Margin. We estimate that annually 1.1 to 2.7×1012g C is stored within peridotites exposed to seawater, of which 30–40% is fixed within the uppermost 20–50m mainly as carbonate. Additionally, we conclude that alteration of oceanic lithosphere is an important factor in the long-term global carbon cycle, having the potential to store carbon for millions of years.
•We compare the carbon geochemistry of peridotite-hosted hydrothermal systems.•The Ligurian ophiolites are likely an ancient analog to the Atlantis Massif.•Up to 2.7×1012g C is stored within peridotites exposed to seawater.•The extent of carbonate uptake is mainly controlled by the presence of fluid pathways.•Serpentinization plays an important role in the long-term global carbon cycle.</description><subject>Basements</subject><subject>biomass</subject><subject>calcite</subject><subject>Carbon</subject><subject>Carbon sequestration</subject><subject>carbon sinks</subject><subject>Carbonates</subject><subject>clay</subject><subject>cooling</subject><subject>energy</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Fluids</subject><subject>Formations</subject><subject>hydrogen</subject><subject>Hydrothermal systems</subject><subject>Iberian Margin</subject><subject>Marine</subject><subject>methane</subject><subject>microbial activity</subject><subject>microorganisms</subject><subject>mixing</subject><subject>Northern Apennine</subject><subject>Ocean Drilling Program</subject><subject>Ophiolites</subject><subject>Rocks</subject><subject>seawater</subject><subject>serpentinite</subject><subject>Serpentinization</subject><subject>tectonics</subject><subject>temperature</subject><issn>0009-2541</issn><issn>1872-6836</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqFkctOxCAUhonRxPHyCEaWblqBFkrdGGO8JSYu1DWhcGqZTMsIjGZ8epkZ966Aw_fDyfkQOqOkpISKy3lpBhg_wJeM0KokvMzVPTSjsmGFkJXYRzNCSFswXtNDdBTjPB9pxfkMDa8QljAlN7kfnZyfsJ4sNjp0eRvhcwUxhe3FFb7BMa3sGvsep2-fQeNyEi8hOOuTS1AMPiaweFjb4NMAYdQLHNe5NsYTdNDrRYTTv_UYvd_fvd0-Fs8vD0-3N8-FrhlLRS87zaWkhhhBKwayahmnLWvaDipZMyGk0X3XVMBrYfueMavrrmEaWq7r2lbH6GL37jL4bfdqdNHAYqEn8KuoaEM4EbJl7H9UiFa2pKEio3yHmuBjDNCrZXCjDmtFidpIUHP1J0FtJCjCFdnmzne5XnulP4KL6v01AzwLaLKSTRPXOwLyUL4cBBU3YzVgXQCTlPXunz9-AWbHnZ8</recordid><startdate>20130802</startdate><enddate>20130802</enddate><creator>Schwarzenbach, Esther M.</creator><creator>Früh-Green, Gretchen L.</creator><creator>Bernasconi, Stefano M.</creator><creator>Alt, Jeffrey C.</creator><creator>Plas, Alessio</creator><general>Elsevier B.V</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope><scope>7TN</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>20130802</creationdate><title>Serpentinization and carbon sequestration: A study of two ancient peridotite-hosted hydrothermal systems</title><author>Schwarzenbach, Esther M. ; Früh-Green, Gretchen L. ; Bernasconi, Stefano M. ; Alt, Jeffrey C. ; Plas, Alessio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a422t-f8ba5881c0c6132e8392519279be3842668cafb73e546dff22da4b72ae95a44d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Basements</topic><topic>biomass</topic><topic>calcite</topic><topic>Carbon</topic><topic>Carbon sequestration</topic><topic>carbon sinks</topic><topic>Carbonates</topic><topic>clay</topic><topic>cooling</topic><topic>energy</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Fluids</topic><topic>Formations</topic><topic>hydrogen</topic><topic>Hydrothermal systems</topic><topic>Iberian Margin</topic><topic>Marine</topic><topic>methane</topic><topic>microbial activity</topic><topic>microorganisms</topic><topic>mixing</topic><topic>Northern Apennine</topic><topic>Ocean Drilling Program</topic><topic>Ophiolites</topic><topic>Rocks</topic><topic>seawater</topic><topic>serpentinite</topic><topic>Serpentinization</topic><topic>tectonics</topic><topic>temperature</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Schwarzenbach, Esther M.</creatorcontrib><creatorcontrib>Früh-Green, Gretchen L.</creatorcontrib><creatorcontrib>Bernasconi, Stefano M.</creatorcontrib><creatorcontrib>Alt, Jeffrey C.</creatorcontrib><creatorcontrib>Plas, Alessio</creatorcontrib><collection>AGRIS</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Chemical geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Schwarzenbach, Esther M.</au><au>Früh-Green, Gretchen L.</au><au>Bernasconi, Stefano M.</au><au>Alt, Jeffrey C.</au><au>Plas, Alessio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Serpentinization and carbon sequestration: A study of two ancient peridotite-hosted hydrothermal systems</atitle><jtitle>Chemical geology</jtitle><date>2013-08-02</date><risdate>2013</risdate><volume>351</volume><spage>115</spage><epage>133</epage><pages>115-133</pages><issn>0009-2541</issn><eissn>1872-6836</eissn><abstract>Fluid circulation in peridotite-hosted hydrothermal systems influences the incorporation of carbon into the oceanic crust and its long-term storage. At low to moderate temperatures, serpentinization of peridotite produces alkaline fluids that are rich in CH4 and H2. Upon mixing with seawater, these fluids precipitate carbonate, forming an extensive network of calcite veins in the basement rocks, while H2 and CH4 serve as an energy source for microorganisms. Here, we analyzed the carbon geochemistry of two ancient peridotite-hosted hydrothermal systems: 1) ophiolites cropping out in the Northern Apennines, and 2) calcite-veined serpentinites from the Iberian Margin (Ocean Drilling Program (ODP) Legs 149 and 173), and compare them to active peridotite-hosted hydrothermal systems such as the Lost City hydrothermal field (LCHF) on the Atlantis Massif near the Mid-Atlantic Ridge (MAR).
Our results show that large amounts of carbonate are formed during serpentinization of mantle rocks exposed on the seafloor (up to 9.6wt.% C in ophicalcites) and that carbon incorporation decreases with depth. In the Northern Apennine serpentinites, serpentinization temperatures decrease from 240°C to <150°C, while carbonates are formed at temperatures decreasing from ~150°C to <50°C. At the Iberian Margin both carbonate formation and serpentinization temperatures are lower than in the Northern Apennines with serpentinization starting at ~150°C, followed by clay alteration at <100°C and carbonate formation at <19–44°C. Comparison with various active peridotite-hosted hydrothermal systems on the MAR shows that the serpentinites from the Northern Apennines record a thermal evolution similar to that of the basement of the LCHF and that tectonic activity on the Jurassic seafloor, comparable to the present-day processes leading to oceanic core complexes, probably led to formation of fractures and faults, which promoted fluid circulation to greater depth and cooling of the mantle rocks. Thus, our study provides further evidence that the Northern Apennine serpentinites host a paleo-stockwork of a hydrothermal system similar to the basement of the LCHF. Furthermore, we argue that the extent of carbonate uptake is mainly controlled by the presence of fluid pathways. Low serpentinization temperatures promote microbial activity, which leads to enhanced biomass formation and the storage of organic carbon. Organic carbon becomes dominant with increasing depth and is the principal carbon phase at more than 50–100m depth of the serpentinite basement at the Iberian Margin. We estimate that annually 1.1 to 2.7×1012g C is stored within peridotites exposed to seawater, of which 30–40% is fixed within the uppermost 20–50m mainly as carbonate. Additionally, we conclude that alteration of oceanic lithosphere is an important factor in the long-term global carbon cycle, having the potential to store carbon for millions of years.
•We compare the carbon geochemistry of peridotite-hosted hydrothermal systems.•The Ligurian ophiolites are likely an ancient analog to the Atlantis Massif.•Up to 2.7×1012g C is stored within peridotites exposed to seawater.•The extent of carbonate uptake is mainly controlled by the presence of fluid pathways.•Serpentinization plays an important role in the long-term global carbon cycle.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.chemgeo.2013.05.016</doi><tpages>19</tpages></addata></record> |
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| subjects | Basements biomass calcite Carbon Carbon sequestration carbon sinks Carbonates clay cooling energy Fluid dynamics Fluid flow Fluids Formations hydrogen Hydrothermal systems Iberian Margin Marine methane microbial activity microorganisms mixing Northern Apennine Ocean Drilling Program Ophiolites Rocks seawater serpentinite Serpentinization tectonics temperature |
| title | Serpentinization and carbon sequestration: A study of two ancient peridotite-hosted hydrothermal systems |
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