I.V. Poberezhska, PUMPELLYITE FROM METABASALTS OF THE UKRAINIAN CARPATHIANS

https://doi.org/10.15407/mineraljournal.45.02.003

UDC 549.6:552.313:552.16(477:292.452)

PUMPELLYITE FROM METABASALTS OF THE UKRAINIAN CARPATHIANS

I.V. Poberezhska, PhD (Geology, Mineralogy), Assist. Prof.

E-mail: irina_pober@ukr.net; orcid: 0000-0001-5020-8326 

N.T. Bilyk, Assist.

E-mail: natbilik@gmail.com; orcid: 0000-0002-9684-195X 

O.I. Matkovskyi, DrSc (Geology, Mineralogy), Professor-Consultant

orcid: 0000-0001-7632-6080 

Ye.M. Slyvko, PhD (Geology, Mineralogy), Assist. Prof.

E-mail: emslivko@i.ua; orcid: 0000-0002-2731-0602 

I.M. Dubrovskyi, Postgraduate

E-mail: Ihor.Dubrovskyi@lnu.edu.ua; orcid: 0000-0002-2995-4284 

Ivan Franko National University of Lviv

4, Hrushevskyi Str., Lviv, Ukraine, 79005

Language: English

Mineralogical journal 2023, 45 (2): 3-15

Abstract: In general, the pumpellyite series (hydrous silicates of Ca and Al) includes such mineral species as pumpellyite-(Al), pumpellyite-(Fe2+), pumpellyite-(Fe3+), pumpellyite-(Mg), and pumpellyite-(Mn). We studied pumpellyite from the Mesozoic metabasalts of the Ukrainian Carpathians in order to recreatethe facies conditions of mineral formation. The studied rocks are metabasalts of the Rakhivsko-Chyvchynskyi and Uholskyi magmatic complexes, which were studied using mineralogical, petrographical and petrogeochemical methods. In the rocks of the Rakhivsko-Chyvchynskyi complex, two morphological varieties of pumpellyite-(Fe) were found, while in the Uholskyi complex an intermediate mineral species between pumpellyite-(Al) and pumpellyite-(Fe2+) was found. The temperature of mineralization during the formation of pumpellyite-containing parageneses was determined: according to ternary feldspar geothermometry — 260 and 310 °C and according to chlorite geothermometry — from 170 to 320 °С. On the PT-diagram for metamorphic facies, the mineral paragenesis of both studied magmatic complexes fall into the field of prehnite-pumpellyite facies. The absence of clear pumpellyite-actinolite subfacies associations indicates that the pressure in the mineral formation system did not exceed 300 MPa.

Keywords: pumpellyite, metabasalt, conditions of mineral formation, mineralogical geothermometer, Mesozoic, Ukrainian Carpathians.

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