Marusiak V. Geology, Mineral Composition and Genesis of Hydrothermal mineralization from the Chyvchyny Ore District in the Ukrainian Carpathians

Marusyak V. P. – Geology, Mineral Composition and Genesis of Hydrothermal mineralization from the Chyvchyny Ore District in the Ukrainian Carpathians. – Manuscript. Thesis for PhD degree in Geological Sciences, speciality 04.00.11 – Geology of metallic and non-metallic mineral resources. – Ivan Franko National University of Lviv. Ministry of Education and Science of Ukraine. – State Institution “Institute of Environmental Geochemistry of NAS of Ukraine”, Kyiv, 2021. The geological settings, mineral composition, physical and chemical features of genesis of hydrothermal mineralization (Chyvchyn ore district (Ukrainian Carpathians) in context of the development of mineralogical-genetical search-evaluation features of pyrite-gold polymetallic mineralization at the Chyvchyn ore district and carbon deposits under the Marmarosh massif thrust have been elaborated in the dissertation work. It was found that hydrothermal mineralization at study area are situated at the zones of longitudinal (general Carpathian direction) and transverse (water streams valley direction) faults intersections and could be used as important structural-teсtonic feature of probable ore mineralization. Mineral composition of hydrothermal mineralization was carry out. Crystal-morphological features of pyrite, thermo-EMF minimal, maximal and average value of pyrite crystals and thermo-EMF value and only electronic conductance of galena within the Albyn and Dobryn ore manifestation were carried out. The typomorphic features of hydrothermal sulfide minerals (pyrite, galena) were determined, which is important for elucidating their level of erosional section and searching for submerged mineralization. Availability of carbon dioxide-water and carbohydrate inclusions were carried out. Carbon dioxide-water inclusions are connected with gold polymetallic ore mineralization, carbohydrate (methane-ethane) inclusions could be surface indicators of the localization of the carbohydrate load at the bottom of the Marmarosh massif. According to the results of the investigation in Chyvchyn ore district two most perspective areas were defined. Lostun ore manifestation are most perspective for pyrite-gold polymetallic mineralization search and Dobryn ore manifestation - for carbon deposits under the Marmarosh massif thrust. Results of the thermobarogeochemical and mineralogical-physical investigation of hydrothermal mineralization could be used for forecast and search geological works in the Chyvchyn ore district for gold-polymetallic mineralization and deposits of hydrocarbons under the Marmarosh massif thrust. Key words: Ukrainian Carpathians, Marmarosh massif, Chyvchyn ore district, ore manifestation, thermobarogeochemical and mineralogical-physical studies, thermo-EMF of semiconductor minerals, homogenization, decrepitation, gold