Transactions of KarRC RAS :: Scientific publications
Transactions of KarRC RAS :: Scientific publications

Transactions of KarRC RAS :: Scientific publications
Karelian Research Centre of RAS
ISSN (print): 1997-3217
ISSN (online): 2312-4504
Transactions of KarRC RAS :: Scientific publications
Background Editorial committee Editorial Office Statute For authors For reviewer Russian version
Transactions of KarRC RAS :: Scientific publications

Electronic Journal OJS



Series

Biogeography

Experimental biology

Mathematical modeling and information technologies

Precambrian Geology

Ecological Studies Series

Limnology and oceanology

Research in the humanities (2010-2015)

Region: Economy and Management (2012-2015)



Issues

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

1999-2008


SCIENTIFIC PUBLICATIONS
О.С. Сибелев.
Спессартин-гроссуляровые гранаты метавулканитов Центрально-Бунделкхандского зеленокаменного комплекса Бунделкхандского кратона, индийский щит (парагенезисы, зональность, стрингеры, включения)
О.S. Sibelev. Spessartine-grossular garnets in metavolcanics from the Central Bundelkhand Greenstone complex of the Bundelkhand Craton, Indian Shield: parageneses, zoning, stringers, and inclusions // Transactions of Karelian Research Centre of Russian Academy of Science. No 2. Precambrian Geology Series. 2020. Pp. 34-54
Keywords: Archean; metamorphism; metasomatism4 parageneses, garnet4 garnet zoning; stringers; Bundelkhand Craton; Indian Shield
Archean metavolcanics from the Mauranipur Structure of the Central Bundelkhand greenstone complex have been subjected to three stages of metamorphism and metasomatism: 1) amphibolite-facies metamorphism (~2.7 Ga), 2) retrograde metamorphism and associated hydrothermal metasomatism (~2,68 Ga), including propylitization, and 3) prehnite-pumpellyite-facies metamorphism presumably associated with the formation of hydrothermal quartz veins (~1,8 Ga). Garnet is stable at all multiple metamorphic stages, varying in composition from almandine-spessartine to grossular and being associated with amphibole (from pargasite and tschermakite to grunerite-cummingtonite and actinolite in composition), clinopyroxene, chlorite, zoisite-clinozoisite, K-feldspar, etc. At the final stages of blastesis it is equiponderous with calcite, albite, prehnite and pumpellyite. Complex, contrasting chemical zoning with well-defined grain boundaries and zonal variations in the mineral composition of inclusions is formed in some of the garnet grains. The number of zones (three) is comparable with the number of epigenetic stages. As the BSE-images of the garnet are contrasting (because of the inverse relationship of FeO and CaO concentrations), the zoning pattern was examined and stringers, “interseasonal anomalies” and inclusions of grossular garnet in spessartine-almandine were revealed. Garnet grains are not always a closed system; recrystallization may occur in them.
Indexed at RSCI


  Last modified: February 26, 2020