Two‐cells phase separation in shallow submarine hydrothermal system at Milos Island, Greece: Boron isotopic evidence
Identifieur interne : 000049 ( Main/Exploration ); précédent : 000048; suivant : 000050Two‐cells phase separation in shallow submarine hydrothermal system at Milos Island, Greece: Boron isotopic evidence
Auteurs : Shein-Fu Wu [Taïwan] ; Chen-Feng You [Taïwan] ; Bo-Shian Wang [Taïwan] ; Eugenia Valsami-Jones [Royaume-Uni] ; Emmanuel Baltatzis [Grèce]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2011-04.
Descripteurs français
- Wicri :
- topic : Sciences de la terre, Eau souterraine.
English descriptors
- KwdEn :
- Ambient seawater, Boron, Boron isotope variations, Brine, Brine fluids, Cave fluids, Cave fluids discharge, Cave fluids show, Cave solutions, Cave vents, Chemical characteristics, Chlorinity, Chlorinity fluids, Critical point, Different pathways, Dotsika, Earth planet, Earth sciences, Fluid, Groundwater, Groundwater addition, Groundwater discharge, Hydrothermal, Hydrothermal circulation, Hydrothermal fluids, Hydrothermal systems, Hydrothermal vent fluids, Important role, Initial seawater, Isotope, Magmatic, Magmatic water, Milo, Milos island, Milos system, National university, Natural history museum, Phase separation, Reaction temperature, Reaction temperatures, Rock fissures, Saline fluids, Seawater, Secondary processes, Shallow submarine hydrothermal system, Shallow submarine hydrothermal systems, Subcritical phase separation, Submarine fluids, Submarine hydrothermal system, Vent fluids, Vulcano island.
- Teeft :
- Ambient seawater, Boron, Boron isotope variations, Brine, Brine fluids, Cave fluids, Cave fluids discharge, Cave fluids show, Cave solutions, Cave vents, Chemical characteristics, Chlorinity, Chlorinity fluids, Critical point, Different pathways, Dotsika, Earth planet, Earth sciences, Fluid, Groundwater, Groundwater addition, Groundwater discharge, Hydrothermal, Hydrothermal circulation, Hydrothermal fluids, Hydrothermal systems, Hydrothermal vent fluids, Important role, Initial seawater, Isotope, Magmatic, Magmatic water, Milo, Milos island, Milos system, National university, Natural history museum, Phase separation, Reaction temperature, Reaction temperatures, Rock fissures, Saline fluids, Seawater, Secondary processes, Shallow submarine hydrothermal system, Shallow submarine hydrothermal systems, Subcritical phase separation, Submarine fluids, Submarine hydrothermal system, Vent fluids, Vulcano island.
Abstract
Three types of hydrothermal vent fluids, herein referred to as cave, submarine‐brine and seawater‐like, were recovered from a shallow submerged system at Milos in the Aegean Sea, Greece, for detailed chemical and isotopic analyses. The cave fluids discharge through rock fissures near sea‐level and have low pH, chlorinity, and B concentrations relative to seawater. The submarine‐brine fluids are characterized by high Cl and contain >10 times seawater B concentrations. A scenario involving a two‐cells circulation is proposed; one occurs at 1–2 km and another at shallower depth. The deeper saline reservoir has experienced subcritical phase separation, partitioning 0.42 mM B in vapor and 6.8 mM in brine with no detectable isotopic fractionation. The reaction temperature in the saline reservoir is 313°C calculated from the Na‐K‐Ca geothermometry. The vapors rise directly to form the cave vents, whereas the saline fluids transport in different pathways and are influenced by seawater mixing to form the variable submarine‐brine fluids. The seawater‐like fluids circulate at shallower depths, where calculated temperature is 248°C and show slightly diluted B (0.36–0.41 mM) and seawater δ11B. These fluids probably resulted from heating of down‐flow seawater and may have experienced groundwater discharge and partial Mg removal. This study represents the first two‐cells circulation occurring at Milos and emphasizes the important role of phase separation in shallow submarine hydrothermal system.
Deep saline reservoir occurs at 1–2 km and another at shallow depth Phase separation has occurred at deep reservoir to form low chlorinity fluids Shallow reservoir has experienced slight fresh dilution and partial Mg removal
Url:
DOI: 10.1029/2011GL047409
Affiliations:
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nuts="2" type="region">Attique (région)</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Geophysical Research Letters</title><title level="j" type="alt">GEOPHYSICAL RESEARCH LETTERS</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><biblScope unit="vol">38</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page-count">5</biblScope><date type="published" when="2011-04">2011-04</date></imprint><idno type="ISSN">0094-8276</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ambient seawater</term><term>Boron</term><term>Boron isotope variations</term><term>Brine</term><term>Brine fluids</term><term>Cave fluids</term><term>Cave fluids discharge</term><term>Cave fluids show</term><term>Cave solutions</term><term>Cave vents</term><term>Chemical characteristics</term><term>Chlorinity</term><term>Chlorinity fluids</term><term>Critical point</term><term>Different pathways</term><term>Dotsika</term><term>Earth planet</term><term>Earth sciences</term><term>Fluid</term><term>Groundwater</term><term>Groundwater addition</term><term>Groundwater discharge</term><term>Hydrothermal</term><term>Hydrothermal circulation</term><term>Hydrothermal fluids</term><term>Hydrothermal systems</term><term>Hydrothermal vent fluids</term><term>Important role</term><term>Initial seawater</term><term>Isotope</term><term>Magmatic</term><term>Magmatic water</term><term>Milo</term><term>Milos island</term><term>Milos system</term><term>National university</term><term>Natural history museum</term><term>Phase separation</term><term>Reaction temperature</term><term>Reaction temperatures</term><term>Rock fissures</term><term>Saline fluids</term><term>Seawater</term><term>Secondary processes</term><term>Shallow submarine hydrothermal system</term><term>Shallow submarine hydrothermal systems</term><term>Subcritical phase separation</term><term>Submarine fluids</term><term>Submarine hydrothermal system</term><term>Vent fluids</term><term>Vulcano island</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Ambient seawater</term><term>Boron</term><term>Boron isotope variations</term><term>Brine</term><term>Brine fluids</term><term>Cave fluids</term><term>Cave fluids discharge</term><term>Cave fluids show</term><term>Cave solutions</term><term>Cave vents</term><term>Chemical characteristics</term><term>Chlorinity</term><term>Chlorinity fluids</term><term>Critical point</term><term>Different pathways</term><term>Dotsika</term><term>Earth planet</term><term>Earth sciences</term><term>Fluid</term><term>Groundwater</term><term>Groundwater addition</term><term>Groundwater discharge</term><term>Hydrothermal</term><term>Hydrothermal circulation</term><term>Hydrothermal fluids</term><term>Hydrothermal systems</term><term>Hydrothermal vent fluids</term><term>Important role</term><term>Initial seawater</term><term>Isotope</term><term>Magmatic</term><term>Magmatic water</term><term>Milo</term><term>Milos island</term><term>Milos system</term><term>National university</term><term>Natural history museum</term><term>Phase separation</term><term>Reaction temperature</term><term>Reaction temperatures</term><term>Rock fissures</term><term>Saline fluids</term><term>Seawater</term><term>Secondary processes</term><term>Shallow submarine hydrothermal system</term><term>Shallow submarine hydrothermal systems</term><term>Subcritical phase separation</term><term>Submarine fluids</term><term>Submarine hydrothermal system</term><term>Vent fluids</term><term>Vulcano island</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Sciences de la terre</term><term>Eau souterraine</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">Three types of hydrothermal vent fluids, herein referred to as cave, submarine‐brine and seawater‐like, were recovered from a shallow submerged system at Milos in the Aegean Sea, Greece, for detailed chemical and isotopic analyses. The cave fluids discharge through rock fissures near sea‐level and have low pH, chlorinity, and B concentrations relative to seawater. The submarine‐brine fluids are characterized by high Cl and contain >10 times seawater B concentrations. A scenario involving a two‐cells circulation is proposed; one occurs at 1–2 km and another at shallower depth. The deeper saline reservoir has experienced subcritical phase separation, partitioning 0.42 mM B in vapor and 6.8 mM in brine with no detectable isotopic fractionation. The reaction temperature in the saline reservoir is 313°C calculated from the Na‐K‐Ca geothermometry. The vapors rise directly to form the cave vents, whereas the saline fluids transport in different pathways and are influenced by seawater mixing to form the variable submarine‐brine fluids. The seawater‐like fluids circulate at shallower depths, where calculated temperature is 248°C and show slightly diluted B (0.36–0.41 mM) and seawater δ11B. These fluids probably resulted from heating of down‐flow seawater and may have experienced groundwater discharge and partial Mg removal. This study represents the first two‐cells circulation occurring at Milos and emphasizes the important role of phase separation in shallow submarine hydrothermal system.</div><div type="abstract">Deep saline reservoir occurs at 1–2 km and another at shallow depth Phase separation has occurred at deep reservoir to form low chlorinity fluids Shallow reservoir has experienced slight fresh dilution and partial Mg removal</div></front></TEI><affiliations><list><country><li>Grèce</li><li>Royaume-Uni</li><li>Taïwan</li></country><region><li>Angleterre</li><li>Attique (région)</li><li>Grand Londres</li></region><settlement><li>Athènes</li><li>Londres</li></settlement></list><tree><country name="Taïwan"><noRegion><name sortKey="Wu, Shein U" sort="Wu, Shein U" uniqKey="Wu S" first="Shein-Fu" last="Wu">Shein-Fu Wu</name></noRegion><name sortKey="Wang, Bo Hian" sort="Wang, Bo Hian" uniqKey="Wang B" first="Bo-Shian" last="Wang">Bo-Shian Wang</name><name sortKey="Wang, Bo Hian" sort="Wang, Bo Hian" uniqKey="Wang B" first="Bo-Shian" last="Wang">Bo-Shian Wang</name><name sortKey="Wu, Shein U" sort="Wu, Shein U" uniqKey="Wu S" first="Shein-Fu" last="Wu">Shein-Fu Wu</name><name sortKey="You, Chen Eng" sort="You, Chen Eng" uniqKey="You C" first="Chen-Feng" last="You">Chen-Feng You</name><name sortKey="You, Chen Eng" sort="You, Chen Eng" uniqKey="You C" first="Chen-Feng" last="You">Chen-Feng You</name><name sortKey="You, Chen Eng" sort="You, Chen Eng" uniqKey="You C" first="Chen-Feng" last="You">Chen-Feng You</name></country><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Valsami Ones, Eugenia" sort="Valsami Ones, Eugenia" uniqKey="Valsami Ones E" first="Eugenia" last="Valsami-Jones">Eugenia Valsami-Jones</name></region></country><country name="Grèce"><region name="Attique (région)"><name sortKey="Baltatzis, Emmanuel" sort="Baltatzis, Emmanuel" uniqKey="Baltatzis E" first="Emmanuel" last="Baltatzis">Emmanuel Baltatzis</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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