AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEA
Methane seeps is a widespread phenomenon observed on the shelves and continental slopes of inland and border seas around the world, including the Laptev Sea. Key biogeochemical processes occurring in the bottom sediments of these areas are the anaerobic oxidation of methane in combination with bacte...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | Russian |
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Tomsk Polytechnic University
2020-07-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/2716/2258 |
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| author | Alexey S. Ruban Maxim A. Rudmin Elena V. Gershelis Andrey A. Leonov Alexey K. Mazurov Oleg V. Dudarev Igor P. Semiletov |
| author_facet | Alexey S. Ruban Maxim A. Rudmin Elena V. Gershelis Andrey A. Leonov Alexey K. Mazurov Oleg V. Dudarev Igor P. Semiletov |
| author_sort | Alexey S. Ruban |
| collection | DOAJ |
| description | Methane seeps is a widespread phenomenon observed on the shelves and continental slopes of inland and border seas around the world, including the Laptev Sea. Key biogeochemical processes occurring in the bottom sediments of these areas are the anaerobic oxidation of methane in combination with bacterial sulfate reduction.Both of these processes control the formation of specific autigenic mineralization. The aim of this work was to study authigenic minerals of bottom sediments with abnormally high concentrations of methane taken from two seeps in the north-eastern part of the Laptev Sea to determine the signs of their identification in ancient sedimentary rocks. The paper presents the results of lithological and mineralogical studies of bottom sediments. It was found that magnesium calcite, gypsum and pyrite are the main authigenic minerals in the studied samples of bottom sediments taken from two seeps in the north-eastern part of the Laptev Sea. The different specifics of authigenic mineralization indicate differences in conditions of migration of methane-containing fluids in these areas, presumably. Temporary decrease in the rate of methane seepage within the «eastern seep» contributed to the saturation of pore water withSO42– and Ca2+and, as a consequence, gypsum deposition. The near-surface position of the sulfate-methane transition zone in the «western seep» due to high methane flows favored the precipitation of magnesian calcite in the upper horizons of bottom sediments. The presence of pyrite in sediments of eastern and western seep is evidence of the activity of the bacterial sulfate reduction during anaerobic methane oxidation. |
| first_indexed | 2024-12-14T04:32:11Z |
| format | Article |
| id | doaj.art-4652febe95b3467e923255225d8023c9 |
| institution | Directory Open Access Journal |
| issn | 2500-1019 2413-1830 |
| language | Russian |
| last_indexed | 2024-12-14T04:32:11Z |
| publishDate | 2020-07-01 |
| publisher | Tomsk Polytechnic University |
| record_format | Article |
| series | Известия Томского политехнического университета: Инжиниринг георесурсов |
| spelling | doaj.art-4652febe95b3467e923255225d8023c92022-12-21T23:17:03ZrusTomsk Polytechnic UniversityИзвестия Томского политехнического университета: Инжиниринг георесурсов2500-10192413-18302020-07-013317243610.18799/24131830/2020/7/2716AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEAAlexey S. Ruban0Maxim A. Rudmin1Elena V. Gershelis2Andrey A. Leonov3Alexey K. Mazurov4Oleg V. Dudarev5Igor P. Semiletov6National Research Tomsk Polytechnic UniversityNational Research Tomsk Polytechnic UniversityNational Research Tomsk Polytechnic UniversityNational Research Tomsk Polytechnic University; Institute of High Current Electronics SB RASNational Research Tomsk Polytechnic UniversityPacific Oceanological Institute FEB RASPacific Oceanological Institute FEB RAS; National Research Tomsk Polytechnic UniversityMethane seeps is a widespread phenomenon observed on the shelves and continental slopes of inland and border seas around the world, including the Laptev Sea. Key biogeochemical processes occurring in the bottom sediments of these areas are the anaerobic oxidation of methane in combination with bacterial sulfate reduction.Both of these processes control the formation of specific autigenic mineralization. The aim of this work was to study authigenic minerals of bottom sediments with abnormally high concentrations of methane taken from two seeps in the north-eastern part of the Laptev Sea to determine the signs of their identification in ancient sedimentary rocks. The paper presents the results of lithological and mineralogical studies of bottom sediments. It was found that magnesium calcite, gypsum and pyrite are the main authigenic minerals in the studied samples of bottom sediments taken from two seeps in the north-eastern part of the Laptev Sea. The different specifics of authigenic mineralization indicate differences in conditions of migration of methane-containing fluids in these areas, presumably. Temporary decrease in the rate of methane seepage within the «eastern seep» contributed to the saturation of pore water withSO42– and Ca2+and, as a consequence, gypsum deposition. The near-surface position of the sulfate-methane transition zone in the «western seep» due to high methane flows favored the precipitation of magnesian calcite in the upper horizons of bottom sediments. The presence of pyrite in sediments of eastern and western seep is evidence of the activity of the bacterial sulfate reduction during anaerobic methane oxidation.http://izvestiya.tpu.ru/archive/article/view/2716/2258diagenesismethane seepsanaerobic methane oxidationcalcitegypsumpyritearcticlaptev sea |
| spellingShingle | Alexey S. Ruban Maxim A. Rudmin Elena V. Gershelis Andrey A. Leonov Alexey K. Mazurov Oleg V. Dudarev Igor P. Semiletov AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEA Известия Томского политехнического университета: Инжиниринг георесурсов diagenesis methane seeps anaerobic methane oxidation calcite gypsum pyrite arctic laptev sea |
| title | AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEA |
| title_full | AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEA |
| title_fullStr | AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEA |
| title_full_unstemmed | AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEA |
| title_short | AUTHIGENIC MINERALS IN THE BOTTOM SEDIMENTS FROM SEEPS OF THE LAPTEV SEA |
| title_sort | authigenic minerals in the bottom sediments from seeps of the laptev sea |
| topic | diagenesis methane seeps anaerobic methane oxidation calcite gypsum pyrite arctic laptev sea |
| url | http://izvestiya.tpu.ru/archive/article/view/2716/2258 |
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