Petrogenesis of Auly Series Amphibolites in Bazavluchok River Basin, Middle Dnipro Megablock of the Ukrainian Shield
UDC 552.4 (477.63)
https://doi.org/10.15407/mineraljournal.37.01.069
V.V. Sukach
M.Р. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine
34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680
Е-mail: svital@ukr.net
Petrogenesis of Auly Series Amphibolites in Bazavluchok River Basin, Middle Dnipro Megablock of the Ukrainian Shield
Language: Ukrainian
Mineralogical journal 2015, 37 (1): 69-85
Abstract: The article expounded results of petrology research of Archean amphibolites, widespread in the Middle Dnipro megablock of the Ukrainian Shield. They enter into the composition of Bazavluchok strata of Auly series. Amphibolites were examined along Bazavluchok riversides in the Novoivanivka area stratotypical of this stratigraphic level. Homogeneous medium-finegrained and porphyroblastic petrographic types of amphibolites were discerned. Calcium amphibole of edenite-pargasite series and average plagioclase andesine represent main mineral paragenesis of these types of amphibolites. This paragenesis was formed in the temperature range of 650—740 °C and pressures 5—8 kbar by plagioclase-amphibolitic geothermobarometer, that satisfies the amphibolitic facies of progressive regional metamorphism. Superimposed actinolite, oligoclase, occasionally epidote, biotite, chlorite and quartz represent regressive changes. Single grains of basic plagioclase — bytownite were discovered in homogeneous medium-fine-grained amphibolites as a relict of mineral paragenesis of pre-metamorphic rocks. Protoliths of amphibolites were magmatic basic rocks mainly effusive facies — basalts and dolerites. Petrochemical data, distribution of rare-earth elements (REE), and also stable areal extent, stratification, homogeneous view within separate layers, mainly schistic structure, presence of supposed porphyric relict texture and others geological-textural features of amphibolites evidence for that. Orthoamphibolites belong to olivine and tholeiitic basalts of tholeiitic series. They are mainly medium-alumina, magnesia-ferrous, medium-titaniferous (to 1 % TiO2). REE content and distribution in am phibolites are similar to tholeiites TH1 of Archean greenstone belts, but have non-typical of them depletion of light elements. Protoliths of amphibolites was formed in the non-oceanic conditions of Earth’s crust compression, which are compared with modern island arcs best of all.
Keywords:amphibolites, Archean, Auly series, amphibolitic metamorphic facies, protholiths, geodynamic position, Middle Dnipro region, Ukrainian Shield.
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