Experimental weathering rates of aluminium-silicates
The chemical weathering of primary rocks and minerals in natural systems has a major impact on soil development and its composition. Chemical weathering is driven to a large extent by mineral dissolution. Through mineral dissolution, elements are released into groundwater and can readily react to pr...
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Other Authors: | , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://theses.hal.science/tel-00933440 https://theses.hal.science/tel-00933440/document https://theses.hal.science/tel-00933440/file/Thesis_Gudbrandsson.pdf |
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ftutoulouse3hal:oai:HAL:tel-00933440v1 |
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openpolar |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
Dissolution basalte crystalline dissolution plagioclase Crystalline basalt dissolution aluminium silicate weathering plagioclase dissolution precipitation of secondary aluminium minerals precipitation gibbsite precipitation kaolinite gibbsite precipitation sequestration CO2 kaolinite precipitation carbFix CO2 sequestration [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Dissolution basalte crystalline dissolution plagioclase Crystalline basalt dissolution aluminium silicate weathering plagioclase dissolution precipitation of secondary aluminium minerals precipitation gibbsite precipitation kaolinite gibbsite precipitation sequestration CO2 kaolinite precipitation carbFix CO2 sequestration [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes Gudbrandsson, Snorri Experimental weathering rates of aluminium-silicates |
topic_facet |
Dissolution basalte crystalline dissolution plagioclase Crystalline basalt dissolution aluminium silicate weathering plagioclase dissolution precipitation of secondary aluminium minerals precipitation gibbsite precipitation kaolinite gibbsite precipitation sequestration CO2 kaolinite precipitation carbFix CO2 sequestration [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
description |
The chemical weathering of primary rocks and minerals in natural systems has a major impact on soil development and its composition. Chemical weathering is driven to a large extent by mineral dissolution. Through mineral dissolution, elements are released into groundwater and can readily react to precipitate secondary minerals such as clays, zeolites, and carbonates. Carbonates form from divalent cations (e.g. Ca, Fe and Mg) and CO2, and kaolin clay and gibbsite formation is attributed to the weathering of aluminium-rich minerals, most notably the feldspars. The CarbFix Project in Hellisheiði SW-Iceland aims to use natural weathering processes to form carbonate minerals by the re-injection of CO2 from a geothermal power plant back into surrounding basaltic rocks. This process is driven by the dissolution of basaltic rocks, rich in divalent cations, which can combine with injected CO2 to form and precipitate carbonates. This thesis focuses on the dissolution behaviour of Stapafell crystalline basalt, which consists of three major phases (plagioclase, pyroxene, and olivine) and is rich in divalent cations. Steady-state element release rates from crystalline basalt at far-from-equilibrium conditions were measured at pH from 2 to 11 and temperatures from 5° to 75° C in mixed-flow reactors. Steady-state Si and Ca release rates exhibit a U-shaped variation with pH, where rates decrease with increasing pH at acid condition but increase with increasing pH at alkaline conditions. Silicon release rates from crystalline basalt are comparable to Si release rates from basaltic glass of the same chemical composition at low pH and temperatures ≥25°C but slower at alkaline pH and temperatures ≥50°C. In contrast, Mg and Fe release rates decrease continuously with increasing pH at all temperatures. This behaviour is interpreted to stem from the contrasting dissolution behaviours of the three major minerals comprising the basalt: plagioclase, pyroxene, and olivine. Element release rates estimated from the sum of the volume ... |
author2 |
Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Université Paul Sabatier - Toulouse III Oelkers Eric |
format |
Doctoral or Postdoctoral Thesis |
author |
Gudbrandsson, Snorri |
author_facet |
Gudbrandsson, Snorri |
author_sort |
Gudbrandsson, Snorri |
title |
Experimental weathering rates of aluminium-silicates |
title_short |
Experimental weathering rates of aluminium-silicates |
title_full |
Experimental weathering rates of aluminium-silicates |
title_fullStr |
Experimental weathering rates of aluminium-silicates |
title_full_unstemmed |
Experimental weathering rates of aluminium-silicates |
title_sort |
experimental weathering rates of aluminium-silicates |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://theses.hal.science/tel-00933440 https://theses.hal.science/tel-00933440/document https://theses.hal.science/tel-00933440/file/Thesis_Gudbrandsson.pdf |
long_lat |
ENVELOPE(-22.524,-22.524,63.908,63.908) |
geographic |
Stapafell |
geographic_facet |
Stapafell |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
https://theses.hal.science/tel-00933440 Geochemistry. Université Paul Sabatier - Toulouse III, 2013. English. ⟨NNT : ⟩ |
op_relation |
tel-00933440 https://theses.hal.science/tel-00933440 https://theses.hal.science/tel-00933440/document https://theses.hal.science/tel-00933440/file/Thesis_Gudbrandsson.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1785585964447432704 |
spelling |
ftutoulouse3hal:oai:HAL:tel-00933440v1 2023-12-17T10:32:21+01:00 Experimental weathering rates of aluminium-silicates Vitesses d'altération expérimentales des silicates d'aluminium Gudbrandsson, Snorri Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Université Paul Sabatier - Toulouse III Oelkers Eric 2013-10-30 https://theses.hal.science/tel-00933440 https://theses.hal.science/tel-00933440/document https://theses.hal.science/tel-00933440/file/Thesis_Gudbrandsson.pdf en eng HAL CCSD tel-00933440 https://theses.hal.science/tel-00933440 https://theses.hal.science/tel-00933440/document https://theses.hal.science/tel-00933440/file/Thesis_Gudbrandsson.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-00933440 Geochemistry. Université Paul Sabatier - Toulouse III, 2013. English. ⟨NNT : ⟩ Dissolution basalte crystalline dissolution plagioclase Crystalline basalt dissolution aluminium silicate weathering plagioclase dissolution precipitation of secondary aluminium minerals precipitation gibbsite precipitation kaolinite gibbsite precipitation sequestration CO2 kaolinite precipitation carbFix CO2 sequestration [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/doctoralThesis Theses 2013 ftutoulouse3hal 2023-11-22T17:26:39Z The chemical weathering of primary rocks and minerals in natural systems has a major impact on soil development and its composition. Chemical weathering is driven to a large extent by mineral dissolution. Through mineral dissolution, elements are released into groundwater and can readily react to precipitate secondary minerals such as clays, zeolites, and carbonates. Carbonates form from divalent cations (e.g. Ca, Fe and Mg) and CO2, and kaolin clay and gibbsite formation is attributed to the weathering of aluminium-rich minerals, most notably the feldspars. The CarbFix Project in Hellisheiði SW-Iceland aims to use natural weathering processes to form carbonate minerals by the re-injection of CO2 from a geothermal power plant back into surrounding basaltic rocks. This process is driven by the dissolution of basaltic rocks, rich in divalent cations, which can combine with injected CO2 to form and precipitate carbonates. This thesis focuses on the dissolution behaviour of Stapafell crystalline basalt, which consists of three major phases (plagioclase, pyroxene, and olivine) and is rich in divalent cations. Steady-state element release rates from crystalline basalt at far-from-equilibrium conditions were measured at pH from 2 to 11 and temperatures from 5° to 75° C in mixed-flow reactors. Steady-state Si and Ca release rates exhibit a U-shaped variation with pH, where rates decrease with increasing pH at acid condition but increase with increasing pH at alkaline conditions. Silicon release rates from crystalline basalt are comparable to Si release rates from basaltic glass of the same chemical composition at low pH and temperatures ≥25°C but slower at alkaline pH and temperatures ≥50°C. In contrast, Mg and Fe release rates decrease continuously with increasing pH at all temperatures. This behaviour is interpreted to stem from the contrasting dissolution behaviours of the three major minerals comprising the basalt: plagioclase, pyroxene, and olivine. Element release rates estimated from the sum of the volume ... Doctoral or Postdoctoral Thesis Iceland Université Toulouse III - Paul Sabatier: HAL-UPS Stapafell ENVELOPE(-22.524,-22.524,63.908,63.908) |