L.M. Stepanyuk, THE U-Pb ZIRCON GEOCHRONOLOGY (LA-ICP-MS) OF GEOLOGICAL PROCESSES IN GRANULITES OF MIDDLE BOUH AREA. A r t i c l e 1. Rock association in the Kosharo-Oleksandrivka open pit

https://doi.org/10.15407/mineraljournal.42.03.050

UDC 550.93

THE U-Pb ZIRCON GEOCHRONOLOGY (LA-ICP-MS) OF GEOLOGICAL PROCESSES IN GRANULITES OF MIDDLE BOUH AREA. A r t i c l e 1. Rock association in the Kosharo-Oleksandrivka open pit

L.M. Stepanyuk, DrSc (Geology), corresponding member of NAS of Ukraine, Prof., Deputy director

E-mail: stepaniuk@nas.gov.ua

https://orcid.org/0000-0001-5591-5169

L.V. Shumlyanskyy, DrSc (Geology), Senior Research Fellow, Leading Researcher

E-mail: lshumlyanskyy@yahoo.com

http://orcid.org/0000-0002-6775-4419

V.O. Gatsenko, PhD (Geology), Senior Research Fellow

E-mail: vera.gatsenko@ukr.net

https://orcid.org/0000-0002-3229-3907

I.M. Lisna, PhD (Geology & Mineralogy), Senior Research Fellow

E-mail: Lesirmich@ukr.net

https://orcid.org/0000-0001-7545-1752

T.I. Dovbush, Researcher Fellow

E-mail: tetyana.dovbush1@gmail.com

https://orcid.org/0000-0002-3512-3313

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

S.A. Wilde, Prof.

Curtin University, School of Earth and Planetary Sciences

GPO Box U1987, Perth WA 6845 Australia

E-mail: s.wilde@curtin.edu.au

http://orcid.org/0000-0002-4546-8278

А.А. Nemchin, Prof.

E-mail: A.Nemchin@curtin.edu.au

http://orcid.org/0000-0002-3955-3409

Curtin University, School of Earth and Planetary Sciences

GPO Box U1987, Perth WA 6845 Australia

B. Bagiński, Dr hab. Prof., Director. Institute of Geochemistry, Mineralogy and Petrology of University of Warsaw

93, al. Żwirki i Wigury, Warszawa 02-089, Polska

E-mail: b.baginski1@uw.edu.pl

http://orcid.org/0000-0002-5809-3452

O.V. Bilan, Head of the Oil and Gas Geology Training Laboratory

Kyiv Taras Shevchenko National University

Educational-scientific institute "Institute of Geology"

90, Vasylkivska Str., Kyiv, Ukraine, 03022

E-mail: olenka.bilan@gmail.com

https://orcid.org/0000-0003-0964-6003

Language: Ukrainian

Mineralogical journal 2020, 42 (3): 50-68

Abstract: The LA-ICP-MS method has been applied to the investigation of U-Pb and Lu-Hf isotope systematics in zircons from enderbitic gneiss that represents the main rock type in the Kosharo-Oleksandrivka open pit, and from amphibolite (metamorphosed ultramafite) that occurs as a body of non-defined shape hosted by enderbitic gneiss. The multigrain TIMS U-Pb dating method was applied to monazite from a charnockite vein that cuts through enderbitic gneiss. At least three zircon populations can be defined in enderbitic gneiss. The oldest (Paleoarchean) population is rather small and includes zircons that yielded an upper intercept age of 3325 ± 42 Ma. The biggest (Mesoarchean) population embraces zircon grains that plot along the regression line with the upper intercept age of 2850 ± 18 Ma, and lower intercept at 2092 ± 45 Ma. The Paleoproterozoic population plots near the lower intercept of the above-mentioned regression line, its age has been defined as ca. 2100 Ma. The εHf value in zircons of the Mesoarchean population varies from 1.9 to –7.7, with a single value as low as –16.4. Paleoproterozoic zircons have εHf in a range –7.7 to –18.4. Amphibolite hosts two zircon populations. The first one has an upper intercept age of 2840 ± 31 Ma and variable Hf isotope composition (εHf — 7.7 to –9.9) that indicate mixing of juvenile mantle-derived and ancient crustal materials. The second population comprises a few zircons of the Paleoproterozoic (2078 ± 24 Ma) age that also had a mixed mantle-crustal source (εHf — 5.2 to –7.9). The late vein of charnockite yielded the U-Pb monazite age of 2015.3 ± 7.2 Ma. According to geothermobarometry, based on mineral composition determined by electron microprobe data, the studied rock association experienced granulite facies metamorphism at a temperature of 720—825 °С and pressure of 6.2—7.5 kbar.

Keywords: Middle Bouh area, granulite association, enderbitic gneiss, amphibolite, zircon, monazite, U-Pb isotope age, Lu-Hf isotope systematics.

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