High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia
Vivianite, a hydrated iron phosphate, is abundant in sediments of Lake El'gygytgyn, located in the Anadyr Mountains of central Chukotka, northeastern Russia (67°30′ N, 172°05′ E). Magnetic measurements, including mass-specific low-field AC magnetic susceptibility, field-dependent magnetic susce...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:243f8ec0997f4904aeacafbc5254b924 2023-05-15T13:24:38+02:00 High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia P. S. Minyuk T. V. Subbotnikova L. L. Brown K. J. Murdock 2013-02-01 https://doi.org/10.5194/cp-9-433-2013 http://www.clim-past.net/9/433/2013/cp-9-433-2013.pdf https://doaj.org/article/243f8ec0997f4904aeacafbc5254b924 en eng Copernicus Publications doi:10.5194/cp-9-433-2013 1814-9324 1814-9332 http://www.clim-past.net/9/433/2013/cp-9-433-2013.pdf https://doaj.org/article/243f8ec0997f4904aeacafbc5254b924 undefined Climate of the Past, Vol 9, Iss 1, Pp 433-446 (2013) geo archeo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.5194/cp-9-433-2013 2023-01-22T17:09:09Z Vivianite, a hydrated iron phosphate, is abundant in sediments of Lake El'gygytgyn, located in the Anadyr Mountains of central Chukotka, northeastern Russia (67°30′ N, 172°05′ E). Magnetic measurements, including mass-specific low-field AC magnetic susceptibility, field-dependent magnetic susceptibility, hysteresis parameters, temperature dependence of the induced magnetization, as well as susceptibility in different heating media, provide ample information on vivianite nodules. Electron microprobe analyses, electron microscopy and energy dispersive spectroscopy were used to identify diagnostic minerals. Vivianite nodules are abundant in both sediments of cold (anoxic) and warm (oxic) stages. Magnetic susceptibility of the nodules varies from 0.78 × 10−6 m3 kg−1 to 1.72 × 10−6 m3 kg−1 (average = 1.05 × 10−6 m3 kg−1) and is higher than the susceptibility of sediments from the cold intervals. Magnetic properties of vivianite are due to the respective product of oxidation as well as sediment and mineral inclusions. Three types of curves for high-temperature dependent susceptibility of vivianite indicate different degrees of oxidation and inclusions in the nodules. Vivianite acts as a reductant and reduces hematite to magnetite and masks the goethite–hematite transition during heating. Heating vivianite and sulfur mixtures stimulates the formation of monoclinic pyrrhotite. An additive of arsenic inhibits the formation of magnetite prior to its Curie temperature. Heating selective vivianite and pyrite mixtures leads to formation of several different minerals – magnetite, monoclinic pyrrhotite, and hexagonal pyrrhotite, and makes it difficult to interpret the thermomagnetic curves. Article in Journal/Newspaper Anadyr Anadyr' Chukotka Unknown Anadyr ENVELOPE(177.510,177.510,64.734,64.734) Anadyr’ ENVELOPE(176.233,176.233,64.882,64.882) Climate of the Past 9 1 433 446 |
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English |
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geo archeo |
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geo archeo P. S. Minyuk T. V. Subbotnikova L. L. Brown K. J. Murdock High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia |
topic_facet |
geo archeo |
description |
Vivianite, a hydrated iron phosphate, is abundant in sediments of Lake El'gygytgyn, located in the Anadyr Mountains of central Chukotka, northeastern Russia (67°30′ N, 172°05′ E). Magnetic measurements, including mass-specific low-field AC magnetic susceptibility, field-dependent magnetic susceptibility, hysteresis parameters, temperature dependence of the induced magnetization, as well as susceptibility in different heating media, provide ample information on vivianite nodules. Electron microprobe analyses, electron microscopy and energy dispersive spectroscopy were used to identify diagnostic minerals. Vivianite nodules are abundant in both sediments of cold (anoxic) and warm (oxic) stages. Magnetic susceptibility of the nodules varies from 0.78 × 10−6 m3 kg−1 to 1.72 × 10−6 m3 kg−1 (average = 1.05 × 10−6 m3 kg−1) and is higher than the susceptibility of sediments from the cold intervals. Magnetic properties of vivianite are due to the respective product of oxidation as well as sediment and mineral inclusions. Three types of curves for high-temperature dependent susceptibility of vivianite indicate different degrees of oxidation and inclusions in the nodules. Vivianite acts as a reductant and reduces hematite to magnetite and masks the goethite–hematite transition during heating. Heating vivianite and sulfur mixtures stimulates the formation of monoclinic pyrrhotite. An additive of arsenic inhibits the formation of magnetite prior to its Curie temperature. Heating selective vivianite and pyrite mixtures leads to formation of several different minerals – magnetite, monoclinic pyrrhotite, and hexagonal pyrrhotite, and makes it difficult to interpret the thermomagnetic curves. |
format |
Article in Journal/Newspaper |
author |
P. S. Minyuk T. V. Subbotnikova L. L. Brown K. J. Murdock |
author_facet |
P. S. Minyuk T. V. Subbotnikova L. L. Brown K. J. Murdock |
author_sort |
P. S. Minyuk |
title |
High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia |
title_short |
High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia |
title_full |
High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia |
title_fullStr |
High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia |
title_full_unstemmed |
High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia |
title_sort |
high-temperature thermomagnetic properties of vivianite nodules, lake el'gygytgyn, northeast russia |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-433-2013 http://www.clim-past.net/9/433/2013/cp-9-433-2013.pdf https://doaj.org/article/243f8ec0997f4904aeacafbc5254b924 |
long_lat |
ENVELOPE(177.510,177.510,64.734,64.734) ENVELOPE(176.233,176.233,64.882,64.882) |
geographic |
Anadyr Anadyr’ |
geographic_facet |
Anadyr Anadyr’ |
genre |
Anadyr Anadyr' Chukotka |
genre_facet |
Anadyr Anadyr' Chukotka |
op_source |
Climate of the Past, Vol 9, Iss 1, Pp 433-446 (2013) |
op_relation |
doi:10.5194/cp-9-433-2013 1814-9324 1814-9332 http://www.clim-past.net/9/433/2013/cp-9-433-2013.pdf https://doaj.org/article/243f8ec0997f4904aeacafbc5254b924 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-9-433-2013 |
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Climate of the Past |
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9 |
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1 |
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433 |
op_container_end_page |
446 |
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