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Peretyazhko, Igor S., Savina, Elena A. (2024) Formation Conditions of Unusual Extremely Reduced High-Temperature Mineral Assemblages in Rocks of Combustion Metamorphic Complexes. Crystals, 14 (12). doi:10.3390/cryst14121052

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Reference TypeJournal (article/letter/editorial)
TitleFormation Conditions of Unusual Extremely Reduced High-Temperature Mineral Assemblages in Rocks of Combustion Metamorphic Complexes
JournalCrystals
AuthorsPeretyazhko, Igor S.Author
Savina, Elena A.Author
Year2024Volume<   14   >
Issue<   12   >
URL
DOIdoi:10.3390/cryst14121052Search in ResearchGate
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Mindat Ref. ID17733901Long-form Identifiermindat:1:5:17733901:3
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Full ReferencePeretyazhko, Igor S., Savina, Elena A. (2024) Formation Conditions of Unusual Extremely Reduced High-Temperature Mineral Assemblages in Rocks of Combustion Metamorphic Complexes. Crystals, 14 (12). doi:10.3390/cryst14121052
Plain TextPeretyazhko, Igor S., Savina, Elena A. (2024) Formation Conditions of Unusual Extremely Reduced High-Temperature Mineral Assemblages in Rocks of Combustion Metamorphic Complexes. Crystals, 14 (12). doi:10.3390/cryst14121052
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Abstract/NotesNew data, including Raman spectroscopy, characterize unusual mineral assemblages from rocks of the Naylga and Khamaryn–Khyral–Khiid combustion metamorphic complexes in Mongolia. Several samples of melilite–nepheline paralava and other thermally altered (metamorphosed) sedimentary rocks contain troilite (FeS), metallic iron Fe0, kamacite α-(Fe,Ni) or Ni-bearing Fe0, taenite Îł-(Fe,Ni) or Ni-rich Fe0, barringerite or allabogdanite Fe2P, schreibersite Fe3P, steadite Fe4P = eutectic α-Fe + Fe3P, wĂŒstite FeO, and cohenite Fe3C. The paralava matrix includes a fragment composed of magnesiowĂŒstite–ferropericlase (FeO–MgO solid solution), as well as of spinel (Mg,Fe)Al2O4 and forsterite. The highest-temperature mineral assemblage belongs to a xenolithic remnant, possibly Fe-rich sinter, which is molten ash left after underground combustion of coal seams. The crystallization temperatures of the observed iron phases were estimated using phase diagrams for the respective systems: Fe–S for iron sulfides and Fe–P ± C for iron phosphides. Iron monosulfides (high-temperature pyrrhotite) with inclusions of Fe0 underwent solid-state conversion into troilite at 140 °C. Iron phosphides in inclusions from the early growth zone of anorthite–bytownite in melilite–nepheline paralava crystallized from <1370 to 1165 °C (Fe2P), 1165–1048 °C (Fe3P), and <1048 °C (Fe4P). Phase relations in zoned spherules consisting of troilite +Fe0 (or kamacite + taenite) +Fe3P ± (Fe3C, Fe4P) reveal the potential presence of a homogeneous Fe–S–P–C melt at T 1350 °C, which separated into two immiscible melts in the 1350–1250 °C range; namely, a dense Fe–P–C melt in the core and a less dense Fe–S melt in the rim. The melts evolved in accordance with cooling paths in the Fe–S and Fe–P–C phase diagrams. Cohenite and schreibersite in the spherules crystallized between 988 °C and 959 °C. The crystallization temperatures of minerals were used to reconstruct redox patterns with respect to the CCO, IW, IM, and MW buffer equilibria during melting of marly limestone and subsequent crystallization and cooling of melilite–nepheline paralava melts. The origin of the studied CM rocks was explained in a model implying thermal alteration of low-permeable overburden domains in reducing conditions during wild subsurface coal fires, while heating was transferred conductively from adjacent parts of ignited coal seams. The fluid (gas) regime in the zones of combustion was controlled by the CCO buffer at excess atomic carbon. Paralava melts exposed to high-temperature extremely reducing conditions contained droplets of immiscible Fe–S–P–C, Fe–S, Fe–P, and Fe–P–C melts, which then crystallized into reduced mineral assemblages.

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LocalityCitation Details
Khamaryn– Khural–Khiid combustion metamorphic complex, Erdene District, Dornogovi Province, Mongolia
Nyalga combustion metamorphic complexes, Bayan District, Töv Province, Mongolia

Mineral Occurrences

LocalityMineral(s)
Khamaryn– Khural–Khiid combustion metamorphic complex, Erdene District, Dornogovi Province, Mongoliaⓘ Allabogdanite, ⓘ Barringerite, ⓘ Bornite, ⓘ Calcite, ⓘ Chalcopyrite, ⓘ Clinker, ⓘ Clinopyroxene Subgroup, ⓘ Cohenite, ⓘ Cordierite, ⓘ Cristobalite, ⓘ Cubanite, ⓘ Davidsmithite, ⓘ Enstatite, ⓘ Fayalite, ⓘ Ferropseudobrookite, ⓘ Ferrosilite, ⓘ Goethite, ⓘ Indialite, ⓘ Kamacite, ⓘ Kuratite, ⓘ Magnetite, ⓘ Melilite Group, ⓘ Microlite Group, ⓘ Mudstone, ⓘ Mullite, ⓘ Native Iron, ⓘ Nepheline, ⓘ Nukundamite, ⓘ Orthopyroxene Subgroup, ⓘ Parabasalt, ⓘ Perovskite, ⓘ Plagioclase, ⓘ Pseudobrookite, ⓘ Pyrrhotite, ⓘ Quartz, ⓘ Rutile, ⓘ Schreibersite, ⓘ Sekaninaite, ⓘ Spinel, ⓘ Taenite, ⓘ Tridymite, ⓘ Troilite, ⓘ Zircon
Nyalga combustion metamorphic complexes, Bayan District, Töv Province, Mongoliaⓘ Calcite, ⓘ Clinopyroxene Subgroup, ⓘ Cohenite, ⓘ Ferropericlase, ⓘ Forsterite, ⓘ Goethite, ⓘ Indialite, ⓘ Kamacite, ⓘ Kirschsteinite, ⓘ Magnesioferrite, ⓘ MagnesiowĂŒstite, ⓘ Magnetite, ⓘ Marcasite, ⓘ Melilite Group, ⓘ Native Iron, ⓘ Nepheline, ⓘ Olivine Group, ⓘ Parabasalt, ⓘ Periclase, ⓘ Plagioclase, ⓘ Pyroxene Group, ⓘ Siderite, ⓘ Spinel, ⓘ Taenite, ⓘ Troilite, ⓘ WĂŒstite

See Also

These are possibly similar items as determined by title/reference text matching only.

Peretyazhko, Igor S., Savina, Elena A. (2023) Melting Processes of Pelitic Rocks in Combustion Metamorphic Complexes of Mongolia: Mineral Chemistry, Raman Spectroscopy, Formation Conditions of Mullite, Silicate Spinel, Silica Polymorphs, and Cordierite-Group Minerals. Geosciences, 13 (12) 377 doi:10.3390/geosciences13120377
Peretyazhko, Igor S., Savina, Elena A., Khromova, Elena A. (2017) Minerals of the rhönite-kuratite series in paralavas from a new combustion metamorphic complex in the Choir–Nyalga basin (Central Mongolia): composition, mineral assemblages and formation conditions. Mineralogical Magazine, 81 (4) 949-974 doi:10.1180/minmag.2016.080.144
Peretyazhko, Igor S., Savina, Elena A. (2022) Chemistry and Crystallization Conditions of Minerals in Metasomatized Oceanic Lithosphere and Basaltic Rocks of Govorov Guyot, Magellan Seamounts, Pacific Ocean. Minerals, 12 (10) 1305 doi:10.3390/min12101305
Peretyazhko, Igor S., and Elena A. Savina. (2022) "Chemistry and Crystallization Conditions of Minerals in Metasomatized Oceanic Lithosphere and Basaltic Rocks of Govorov Guyot, Magellan Seamounts, Pacific Ocean" Minerals 12, no. 10: 1305. https://doi.org/10.3390/min12101305
Peretyazhko, Igor S., Savina, Elena A., Khromova, Elena A. (2021) Low-pressure (> 4 MPa) and high-temperature (> 1250 °C) incongruent melting of marly limestone: formation of carbonate melt and melilite–nepheline paralava in the Khamaryn–Khural–Khiid combustion metamorphic complex, East Mongolia. Contributions to Mineralogy and Petrology, 176 (5) doi:10.1007/s00410-021-01794-5
Peretyazhko, I. S., Savina, E. A., Dmitrieva, A. S. (2024) Rocks of the Ary-Bulak Ongonite Massif: Relationship between Geochemical Features, Mineral-Phase Assemblages, and Formation Processes. Petrology, 32 (3) 359-385 doi:10.1134/s0869591124700061
Peretyazhko, Igor S., Savina, Elena A., Pulyaeva, Irina A. (2024) Miocene Petit-Spot Basanitic Volcanoes on Cretaceous Alba Guyot (Magellan Seamount Trail, Pacific Ocean). Geosciences, 14 (10). doi:10.3390/geosciences14100252
Glushkova, V.E., Peretyazhko, I.S., Savina, E.A., Khromova, E.A. (2023): Major Rock-Forming Minerals of Paralava in Mongolian Combustion Metamorphic Complexes. Zapiski RMO, 152(4), 65-83.
Peretyazhko, Igor S., Savina, Elena A. (2023) Cretaceous intraplate volcanism of Govorov Guyot and formation models of the Magellan seamounts, Pacific Ocean. International Geology Review, 65 (16). 2479-2505 doi:10.1080/00206814.2022.2145512
Savina, E. A., Peretyazhko, I. S., Khromova, E. A., & Glushkova, V. E. (2020). Melted Rocks (Clinkers and Paralavas) from the Khamaryn–Khural–Khiid Combustion Metamorphic Complex in Eastern Mongolia: Mineralogy, Geochemistry and Genesis. Petrology, 28(5), 431-457.
Glushkova, V. E., Peretyazhko, I. S., Savina, E. A., Khromova, Е. А. (2023) Major Rock-Forming Minerals of Paralava in Mongolian Combustion Metamorphic Complexes. Zapiski RMO (Proceedings of the Russian Mineralogical Society) 4, 65-83 doi:10.31857/s0869605523040056
 
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