S. V. Pribavkin, E. V. Pushkarev, I. S. Chashchukhin, Yu. V. Erokhin, A. V. Korovko
{"title":"乌拉尔和外乌拉尔岩石中Тochilinite-Ferrotochilinite系列矿物:Мineral Аssociations、Сhemical Сomposition和成因","authors":"S. V. Pribavkin, E. V. Pushkarev, I. S. Chashchukhin, Yu. V. Erokhin, A. V. Korovko","doi":"10.1134/S0869591124700358","DOIUrl":null,"url":null,"abstract":"<div><p>The paper presents the results of studying the scarce iron–magnesium sulfide–hydroxides of the tochilinite–ferrotochilinite series with the ideal formula 6FeS·5Mg(OH)<sub>2</sub>. These minerals are formed during serpentinization of ultrabasites of different nature and were described in peridotites of the Kempirsai, Khabarny, Kytlym and Uktus massifs in the Urals and the Verkhne-Iusskaya area of the Shaim petroleum region of Western Siberia. The aim of this work is to examine the poorly studied chemical composition of tochilinite, to determine its mineral associations and conditions of formation. The minerals were analyzed by optical and electron scanning microscopy, Raman and IR spectroscopy. Based on the magnesium number (<i>Х</i><sub>Mg</sub>), the minerals could be divided into tochilinite and ferrotochilinite. High-Mg minerals (<i>Х</i><sub>Mg</sub> = 0.73–0.79) are found in the Uktus massif and in the Verkhne-Iusskaya area, and low-Mg varieties (<i>Х</i><sub>Mg</sub> = 0.15–0.38) occur in the Khabarny and Kytlym massifs. The presence of mixed-layer phases represented by the alternation of nano-scale layers of tochilinite or ferrotochilinite with serpentine is assumed. The chromium-bearing varieties of tochilinite are noted. Mechanisms and chemical reactions leading to the formation of tochilinites during the low-temperature transformation of peridotite in the presence of water are discussed. In most cases, this is the interaction of metamorphic water with magmatic sulfides during the serpentinization of peridotite, or the influence of sedimentary or another waters containing dissolved sulfur on them. It is concluded that tochilinite served as a sulfur absorbent during early reticulate serpentinization of ultramafic rocks. Tochilinite could be used as a promising geothermometer for low-temperature ultramafic mineral assemblages.</p></div>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 2","pages":"112 - 129"},"PeriodicalIF":1.0000,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Minerals of the Тochilinite–Ferrotochilinite Series from Rocks of the Urals and Trans-Urals: Мineral Аssociations, Сhemical Сomposition, and Genesis\",\"authors\":\"S. V. Pribavkin, E. V. Pushkarev, I. S. Chashchukhin, Yu. V. Erokhin, A. V. Korovko\",\"doi\":\"10.1134/S0869591124700358\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The paper presents the results of studying the scarce iron–magnesium sulfide–hydroxides of the tochilinite–ferrotochilinite series with the ideal formula 6FeS·5Mg(OH)<sub>2</sub>. These minerals are formed during serpentinization of ultrabasites of different nature and were described in peridotites of the Kempirsai, Khabarny, Kytlym and Uktus massifs in the Urals and the Verkhne-Iusskaya area of the Shaim petroleum region of Western Siberia. The aim of this work is to examine the poorly studied chemical composition of tochilinite, to determine its mineral associations and conditions of formation. The minerals were analyzed by optical and electron scanning microscopy, Raman and IR spectroscopy. Based on the magnesium number (<i>Х</i><sub>Mg</sub>), the minerals could be divided into tochilinite and ferrotochilinite. High-Mg minerals (<i>Х</i><sub>Mg</sub> = 0.73–0.79) are found in the Uktus massif and in the Verkhne-Iusskaya area, and low-Mg varieties (<i>Х</i><sub>Mg</sub> = 0.15–0.38) occur in the Khabarny and Kytlym massifs. The presence of mixed-layer phases represented by the alternation of nano-scale layers of tochilinite or ferrotochilinite with serpentine is assumed. The chromium-bearing varieties of tochilinite are noted. Mechanisms and chemical reactions leading to the formation of tochilinites during the low-temperature transformation of peridotite in the presence of water are discussed. In most cases, this is the interaction of metamorphic water with magmatic sulfides during the serpentinization of peridotite, or the influence of sedimentary or another waters containing dissolved sulfur on them. It is concluded that tochilinite served as a sulfur absorbent during early reticulate serpentinization of ultramafic rocks. 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Minerals of the Тochilinite–Ferrotochilinite Series from Rocks of the Urals and Trans-Urals: Мineral Аssociations, Сhemical Сomposition, and Genesis
The paper presents the results of studying the scarce iron–magnesium sulfide–hydroxides of the tochilinite–ferrotochilinite series with the ideal formula 6FeS·5Mg(OH)2. These minerals are formed during serpentinization of ultrabasites of different nature and were described in peridotites of the Kempirsai, Khabarny, Kytlym and Uktus massifs in the Urals and the Verkhne-Iusskaya area of the Shaim petroleum region of Western Siberia. The aim of this work is to examine the poorly studied chemical composition of tochilinite, to determine its mineral associations and conditions of formation. The minerals were analyzed by optical and electron scanning microscopy, Raman and IR spectroscopy. Based on the magnesium number (ХMg), the minerals could be divided into tochilinite and ferrotochilinite. High-Mg minerals (ХMg = 0.73–0.79) are found in the Uktus massif and in the Verkhne-Iusskaya area, and low-Mg varieties (ХMg = 0.15–0.38) occur in the Khabarny and Kytlym massifs. The presence of mixed-layer phases represented by the alternation of nano-scale layers of tochilinite or ferrotochilinite with serpentine is assumed. The chromium-bearing varieties of tochilinite are noted. Mechanisms and chemical reactions leading to the formation of tochilinites during the low-temperature transformation of peridotite in the presence of water are discussed. In most cases, this is the interaction of metamorphic water with magmatic sulfides during the serpentinization of peridotite, or the influence of sedimentary or another waters containing dissolved sulfur on them. It is concluded that tochilinite served as a sulfur absorbent during early reticulate serpentinization of ultramafic rocks. Tochilinite could be used as a promising geothermometer for low-temperature ultramafic mineral assemblages.
期刊介绍:
Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.