乌拉尔和外乌拉尔岩石中Тochilinite-Ferrotochilinite系列矿物:Мineral Аssociations、Сhemical Сomposition和成因

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
S. V. Pribavkin, E. V. Pushkarev, I. S. Chashchukhin, Yu. V. Erokhin, A. V. Korovko
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引用次数: 0

摘要

本文介绍了以6FeS·5Mg(OH)2为理想分子式对富铁-富铁-富铁系列中稀缺的硫化铁镁氢氧化物进行研究的结果。这些矿物是在不同性质的超基岩的蛇纹岩化过程中形成的,在西伯利亚西部沙伊姆油区乌拉尔的Kempirsai、Khabarny、Kytlym和Uktus地块和Verkhne-Iusskaya地区的橄榄岩中被描述过。这项工作的目的是检查研究不足的tochilinite的化学成分,以确定其矿物组合和形成条件。采用光学、电子扫描显微镜、拉曼光谱和红外光谱对矿物进行了分析。根据镁含量(ХMg),可将其分为土铁石和铁土铁石。高镁矿物(ХMg = 0.73-0.79)分布在Uktus地块和Verkhne-Iusskaya地区,低镁矿物(ХMg = 0.15-0.38)分布在Khabarny地块和Kytlym地块。假设存在以蛇纹石或铁土石的纳米层交替为代表的混合层相。指出了富铬土的品种。讨论了橄榄岩在有水存在的条件下低温转化过程中土沸石形成的机理和化学反应。在大多数情况下,这是在橄榄岩蛇纹石化过程中变质水与岩浆硫化物的相互作用,或者是沉积物或其他含有溶解硫的水对它们的影响。结果表明,在超镁质岩石的早期网状蛇纹岩化过程中,毒力石起着吸硫剂的作用。Tochilinite可以作为低温超镁铁性矿物组合的一种有前景的地温计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
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.
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