Diagenetic formation of gypsum and dolomite in a cold‐water coral mound in the Porcupine Seabight, off Ireland
Identifieur interne : 000611 ( Main/Exploration ); précédent : 000610; suivant : 000612Diagenetic formation of gypsum and dolomite in a cold‐water coral mound in the Porcupine Seabight, off Ireland
Auteurs : Hans Pirlet [Belgique] ; Laura M. Wehrmann [Allemagne] ; Benjamin Brunner [Allemagne] ; Norbert Frank [France] ; Jan Dewanckele [Belgique] ; David Van Rooij [Belgique] ; Anneleen Foubert [Belgique] ; Rudy Swennen [Belgique] ; Lieven Naudts [Belgique] ; Matthieu Boone [Belgique] ; Veerle Cnudde [Belgique] ; Jean-Pierre Henriet [Belgique]Source :
- Sedimentology [ 0037-0746 ] ; 2010-04.
English descriptors
- KwdEn :
Abstract
Authigenic gypsum was found in a gravity core, retrieved from the top of Mound Perseverance, a giant cold‐water coral mound in the Porcupine Basin, off Ireland. The occurrence of gypsum in such an environment is intriguing, because gypsum, a classic evaporitic mineral, is undersaturated with respect to sea water. Sedimentological, petrographic and isotopic evidence point to diagenetic formation of the gypsum, tied to oxidation of sedimentary sulphide minerals (i.e. pyrite). This oxidation is attributed to a phase of increased bottom currents which caused erosion and enhanced inflow of oxidizing fluids into the mound sediments. The oxidation of pyrite produced acidity, causing carbonate dissolution and subsequently leading to pore‐water oversaturation with respect to gypsum and dolomite. Calculations based on the isotopic compositions of gypsum and pyrite reveal that between 21·6% and 28·6% of the sulphate incorporated into the gypsum derived from pyrite oxidation. The dissolution of carbonate increased the porosity in the affected sediment layer but promoted lithification of the sediments at the sediment‐water interface. Thus, authigenic gypsum can serve as a signature for diagenetic oxidation events in carbonate‐rich sediments. These observations demonstrate that fluid flow, steered by environmental factors, has an important effect on the diagenesis of coral mounds.
Url:
DOI: 10.1111/j.1365-3091.2009.01119.x
Affiliations:
- Allemagne, Belgique, France
- Bavière, Brême (Land), District de Haute-Bavière, Province de Flandre-Orientale, Province du Brabant flamand, Région flamande, Île-de-France
- Brême, Gand, Gif‐sur‐Yvette, Heverlee, Louvain, Munich
- Université de Gand
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Leuven, Celestijnenlaan 200E, 3001 Heverlee</wicri:regionArea><placeName><region type="province" nuts="2">Province du Brabant flamand</region><settlement type="town">Heverlee</settlement><settlement type="city">Louvain</settlement></placeName></affiliation></author><author><name sortKey="Swennen, Rudy" sort="Swennen, Rudy" uniqKey="Swennen R" first="Rudy" last="Swennen">Rudy Swennen</name><affiliation wicri:level="3"><country xml:lang="fr">Belgique</country><wicri:regionArea>Department of Earth and Environmental Sciences, Geology, K.U. Leuven, Celestijnenlaan 200E, 3001 Heverlee</wicri:regionArea><placeName><region type="province" nuts="2">Province du Brabant flamand</region><settlement type="town">Heverlee</settlement><settlement type="city">Louvain</settlement></placeName></affiliation></author><author><name sortKey="Naudts, Lieven" sort="Naudts, Lieven" uniqKey="Naudts L" first="Lieven" last="Naudts">Lieven Naudts</name><affiliation wicri:level="4"><country wicri:rule="url">Belgique</country><wicri:regionArea>Renard Centre of Marine Geology, Department of Geology and Soil Science, Ghent University, Krijgslaan 281 s8, B‐9000 Gent</wicri:regionArea><orgName type="university">Université de Gand</orgName><placeName><settlement type="city">Gand</settlement><region>Région flamande</region><region type="district" nuts="2">Province de Flandre-Orientale</region></placeName></affiliation></author><author><name sortKey="Boone, Matthieu" sort="Boone, Matthieu" uniqKey="Boone M" first="Matthieu" last="Boone">Matthieu Boone</name><affiliation wicri:level="4"><country xml:lang="fr">Belgique</country><wicri:regionArea>Department of Subatomic and Radiation Physics, Ghent University, B‐9000 Gent</wicri:regionArea><orgName type="university">Université de Gand</orgName><placeName><settlement type="city">Gand</settlement><region>Région flamande</region><region type="district" nuts="2">Province de Flandre-Orientale</region></placeName></affiliation></author><author><name sortKey="Cnudde, Veerle" sort="Cnudde, Veerle" uniqKey="Cnudde V" first="Veerle" last="Cnudde">Veerle Cnudde</name><affiliation wicri:level="4"><country xml:lang="fr">Belgique</country><wicri:regionArea>Department of Geology and Soil Science, Ghent University, Krijgslaan 281 s8, B‐9000 Gent</wicri:regionArea><orgName type="university">Université de Gand</orgName><placeName><settlement type="city">Gand</settlement><region>Région flamande</region><region type="district" nuts="2">Province de Flandre-Orientale</region></placeName></affiliation><affiliation wicri:level="4"><country xml:lang="fr">Belgique</country><wicri:regionArea>Department of Subatomic and Radiation Physics, Ghent University, B‐9000 Gent</wicri:regionArea><orgName type="university">Université de Gand</orgName><placeName><settlement type="city">Gand</settlement><region>Région flamande</region><region type="district" nuts="2">Province de Flandre-Orientale</region></placeName></affiliation></author><author><name sortKey="Henriet, Jean Ierre" sort="Henriet, Jean Ierre" uniqKey="Henriet J" first="Jean-Pierre" last="Henriet">Jean-Pierre Henriet</name><affiliation wicri:level="4"><country wicri:rule="url">Belgique</country><wicri:regionArea>Renard Centre of Marine Geology, Department of Geology and Soil Science, Ghent University, Krijgslaan 281 s8, B‐9000 Gent</wicri:regionArea><orgName type="university">Université de Gand</orgName><placeName><settlement type="city">Gand</settlement><region>Région flamande</region><region type="district" nuts="2">Province de Flandre-Orientale</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Sedimentology</title><idno type="ISSN">0037-0746</idno><idno type="eISSN">1365-3091</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2010-04">2010-04</date><biblScope unit="volume">57</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="786">786</biblScope><biblScope unit="page" to="805">805</biblScope></imprint><idno type="ISSN">0037-0746</idno></series><idno type="istex">B8BCF8269E5BD30429D7E7A256F74A02693AB037</idno><idno type="DOI">10.1111/j.1365-3091.2009.01119.x</idno><idno type="ArticleID">SED1119</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0037-0746</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cold‐water coral</term><term>Lophelia</term><term>Porcupine Seabight</term><term>dolomite</term><term>early diagenesis</term><term>gypsum</term><term>sulphur isotopes</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Authigenic gypsum was found in a gravity core, retrieved from the top of Mound Perseverance, a giant cold‐water coral mound in the Porcupine Basin, off Ireland. The occurrence of gypsum in such an environment is intriguing, because gypsum, a classic evaporitic mineral, is undersaturated with respect to sea water. Sedimentological, petrographic and isotopic evidence point to diagenetic formation of the gypsum, tied to oxidation of sedimentary sulphide minerals (i.e. pyrite). This oxidation is attributed to a phase of increased bottom currents which caused erosion and enhanced inflow of oxidizing fluids into the mound sediments. The oxidation of pyrite produced acidity, causing carbonate dissolution and subsequently leading to pore‐water oversaturation with respect to gypsum and dolomite. Calculations based on the isotopic compositions of gypsum and pyrite reveal that between 21·6% and 28·6% of the sulphate incorporated into the gypsum derived from pyrite oxidation. The dissolution of carbonate increased the porosity in the affected sediment layer but promoted lithification of the sediments at the sediment‐water interface. Thus, authigenic gypsum can serve as a signature for diagenetic oxidation events in carbonate‐rich sediments. These observations demonstrate that fluid flow, steered by environmental factors, has an important effect on the diagenesis of coral mounds.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Belgique</li><li>France</li></country><region><li>Bavière</li><li>Brême (Land)</li><li>District de Haute-Bavière</li><li>Province de Flandre-Orientale</li><li>Province du Brabant flamand</li><li>Région flamande</li><li>Île-de-France</li></region><settlement><li>Brême</li><li>Gand</li><li>Gif‐sur‐Yvette</li><li>Heverlee</li><li>Louvain</li><li>Munich</li></settlement><orgName><li>Université de Gand</li></orgName></list><tree><country name="Belgique"><region name="Région flamande"><name sortKey="Pirlet, Hans" sort="Pirlet, Hans" uniqKey="Pirlet H" first="Hans" last="Pirlet">Hans Pirlet</name></region><name sortKey="Boone, Matthieu" sort="Boone, Matthieu" uniqKey="Boone M" first="Matthieu" last="Boone">Matthieu Boone</name><name sortKey="Cnudde, Veerle" sort="Cnudde, Veerle" uniqKey="Cnudde V" first="Veerle" last="Cnudde">Veerle Cnudde</name><name sortKey="Cnudde, Veerle" sort="Cnudde, Veerle" uniqKey="Cnudde V" first="Veerle" last="Cnudde">Veerle Cnudde</name><name sortKey="Dewanckele, Jan" sort="Dewanckele, Jan" uniqKey="Dewanckele J" first="Jan" last="Dewanckele">Jan Dewanckele</name><name sortKey="Dewanckele, Jan" sort="Dewanckele, Jan" uniqKey="Dewanckele J" first="Jan" last="Dewanckele">Jan Dewanckele</name><name sortKey="Foubert, Anneleen" sort="Foubert, Anneleen" uniqKey="Foubert A" first="Anneleen" last="Foubert">Anneleen Foubert</name><name sortKey="Henriet, Jean Ierre" sort="Henriet, Jean Ierre" uniqKey="Henriet J" first="Jean-Pierre" last="Henriet">Jean-Pierre Henriet</name><name sortKey="Naudts, Lieven" sort="Naudts, Lieven" uniqKey="Naudts L" first="Lieven" last="Naudts">Lieven Naudts</name><name sortKey="Swennen, Rudy" sort="Swennen, Rudy" uniqKey="Swennen R" first="Rudy" last="Swennen">Rudy Swennen</name><name sortKey="Van Rooij, David" sort="Van Rooij, David" uniqKey="Van Rooij D" first="David" last="Van Rooij">David Van Rooij</name></country><country name="Allemagne"><region name="Brême (Land)"><name sortKey="Wehrmann, Laura M" sort="Wehrmann, Laura M" uniqKey="Wehrmann L" first="Laura M." last="Wehrmann">Laura M. Wehrmann</name></region><name sortKey="Brunner, Benjamin" sort="Brunner, Benjamin" uniqKey="Brunner B" first="Benjamin" last="Brunner">Benjamin Brunner</name><name sortKey="Wehrmann, Laura M" sort="Wehrmann, Laura M" uniqKey="Wehrmann L" first="Laura M." last="Wehrmann">Laura M. Wehrmann</name></country><country name="France"><region name="Île-de-France"><name sortKey="Frank, Norbert" sort="Frank, Norbert" uniqKey="Frank N" first="Norbert" last="Frank">Norbert Frank</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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