D.K. Voznyak, NEW ASPECTS OF FLUID INCLUSIONS application for reconstruction OF MINERAL formation PT-CONDITIONS


UDC 548.4:082.2

NEW ASPECTS OF FLUID INCLUSIONS application for reconstruction OF MINERAL formation PT-CONDITIONS

D.K. Voznyak, DrSc (Geology), Chief Research Fellow. https://orcid.org/0000-0002-6124-2033
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: dkvoznyak@ukr.net

V.O. Syomka, DrSc (Geology), Chief Research Fellow. https://orcid.org/0000-0001-5202-4045
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: syomka1949@gmail.com

V.M. Belskyi, PhD (Geology), Researcher Fellow. Researcher ID: K-8607-2018
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: belskyi_vm@ukr.net

Language: Ukrainian
Mineralogical journal 2020, 42 (1): 24-35

Abstract: By convention, the information about the PT-parameters of mineral formation obtained by fluid inclusions study is classified into basic and additional. The former is based on studying the genetic nature of inclusions of homogeneous and heterogeneous capture that are homogeneous and heterogeneous in origin (according to V.A. Kalyuzhnyi). It forms predominant data set on the PT-parameters of mineral formation. The latter, additional information substantially supplements the basic information. It is obtained by studying inclusions refilling and cracking , variations in chemical composition of the mineral substance re-deposited on the walls of the inclusion during the acquisition of the equilibrium form of the negative crystal as well as the study of inclusions with "cap". These are inclusions of new type that have indicator (typomorphic) value. It should be noted that, in general, there are rare examples of application of volatile components inclusions that are homogeneous in origin for reconstruction of PT-conditions of mineral formation. It is not easy to find a point on the isochore that corresponds to the inclusion content and it should be done in separate way by determination of either temperature or pressure. Sometimes there are cases of direct determination of the RT-condition of mineral formation. The solution of such cases might be done through estimation of fluid pressure at formation of metamorphic mineral; determination of the overheating degree of inclusions in quartz from Volyn chamber pegmatites and the depth of pegmatites formation; revealing the role of high-thermobaric CO2 fluid flows in the formation of the Mayske gold deposit; studying the genesis of quartz-albite-petalite pegmatites in the western part of the Ingul megablock as well as REE-U-Th ores of Dibrova deposit (Ukrainian Shield); formation of inclusions with a "cap".
Keywords: fluid inclusions, PT-parameters, homogeneous and heterogeneous capture, homogeneous and heterogeneous origin of inclusions.


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