PETROPARAGENESES AND POSSIBLE ORIGIN OF THE BUG AREA GRANULITE COMPLEX SUPERCRUSTAL FORMATIONS (WESTERN PART OF UKRAINIAN SHIELD)
V.P. Kyrylyuk, https://orcid.org/0000-0001-7649-9432
M.I. Bogdanova, https://orcid.org/0000-0002-7850-4482
E.I. Savina, https://orcid.org/0000-0001-5551-8630
Ivan Franko National University of Lviv. 4, Grushevskogo Str., Lviv, Ukraine, 79005
PETROPARAGENESES AND POSSIBLE ORIGIN OF THE BUG AREA GRANULITE COMPLEX SUPERCRUSTAL FORMATIONS (WESTERN PART OF UKRAINIAN SHIELD). Article 1. GENERAL INFORMATION AND ROCK COMPOSITION OF THE PETROPARAGENESES
Mineralogical journal 2019, 41 (1): 60-70
Abstract: General information. The Bug Area granulite complex within the limits of western part of the Ukrainian shield embraces the territory of about 40000 km2. Seven supercrustal formations are estabishedin it: kinzigite, enderbite-gneiss, leucogranulitic, high-aluminous-quartzite, marble-calciphyre, khondalite and aluminous-basite formations. Their general thickness is about 15-17 kilometers. Accepted terminology. The article defines the terms like: "supercrustal formation", "petroparagenesis" and "petrotype". Rock composition of petroparageneses. Seven main petroparageneses form these supercrustal formations, that include main content of the same supercrustal formations, and three secondary petroparageneses: calciphyr-cristal-schist, magnetite-containing and metabasite-metaultrabasite. Each petroparagenesis includes from two to three petrotypes. Also the article provides the rock formations of petrotypes and their content in petroparagenesis. Major and secondary rock parageneses are clearly recognized when they are observed in full size on well-exposed areas. Herewith very informative are not only the rock parageneses, but also their individual petrotypes, that demonstrate their own typomorphic features. Such features can be represented with rock, mineral and element (geochemical) features as follows: a) peculiarities of rock habitus; b) peculiarities of chemistry that normally are well reflected in the petrographic composition of rocks; c) composition and appearance of the rock-forming and accessory minerals; d) geochemical differences, including isotopic ones, and others. Also there might be signs of rock, mineral and element (geochemical) levels, including: a) features of the external appearance of rocks; b) features of chemistry, which are usually well reflected in the petrographic composition of rocks; c) composition and set of rock-forming and accessory minerals; d) geochemical (including isotope) differences, etc. Typomorphic features of the petrotypes are considered in the next article.
Keywords: granulitic complex, supercrustal formation, petroparagenesis, petrotype, typomorphic features.
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