Alkaline rocks from Mariupol massif (SW Ukraine) part I

At September 2010 M.P.Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Science of Ukraine and the Mineralogical Society of Poland organized conference ALKALINE ROCKS: PETROLOGY, MINERALOGY, GEOCHEMISTRY Conference dedicated to the memory of J.A.Morozewicz. Post-conference field trip took place in the Mariupol massif (Oktyabr’skii Massif), Azov Sea Region, Donetsk (Donets’k) Oblast’, SE Ukraine.

The alkaline Mariupol massif (Oktyabr’skii Massif), situated in a north-western part of the eastern Priazovian region, approximately 3 km south of Volnovakha and 50 km south-east of Donetsk (south-eastern Ukraine), is a unique province of alkaline magmatism of  Proterozoic age ca. 1.8 ga. It covers an area of 34 km² (Krivdik et al. 2007). The Mariupol massif is oval-shaped, with a N–S elongation. It has a concentric structure: in the centre there are pulaskites (nepheline-bearing alkali feldspar syenites with variable proportions of dark minerals such as Na-bearing pyroxenes and amphiboles, fayalite and biotite), which are surrounded by foyaites (nepheline syenites composed mainly of K-feldspar and nepheline). The latter are in turn enclosed by syenites. Mariupolites (microcline-nepheline syenites), forming veins of various thickness, occur in the periphery of this alkaline complex. Ultramafic and mafic rocks (peridotites, pyroxenites and gabbros) occur in the outer ring of the massif [Dumańska-Słowik et al. 2011].

During the first day of two-day field trip there were two main stops (check also second day of field-trip):

Open pit in Khlebodarivka (Chlebodarovka) village exposes enderbite (charnockitic tonalite), cut by veins and dykes of camptonite (lampropyre), carrying megacrysts of biotite, amphibole, augite, anorthoclase, as well as veins (dykes) of calcite-carbonatite with exocontact fenitic aureole.

Khlebodarivka quarry (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine

Greenish plagioclases (Ca,Na)[Al(Al,Si)Si2O8] and dark pyroxenes in enderbite (charnockitic tonalite); Khlebodarivka quarry (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; FOV: 40 mm

Contact between coarse-grain enderbite (charnockitic tonalite) and porphiric camptonite vein (phenocrysts are mainly pyroxene var. augite, amphibole var. kaersutite, biotite and Ti-biotite, and less common alkali feldspars), field photo; Khlebodarivka quarry (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine

Fenite – metasomatic rock characterized by the presence of pink alkali feldspar [microcline K(AlSi3O8)], dark grey, fibrous sodic amphiboles [riebeckite □Na2(Fe3Fe2)Si8O22(OH)2 or arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2] and black sodic pyroxene aegirine NaFeSi2O6; Chlebodarovsk (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; 95 x 60 x 40 mm

Large, rounded crystal of plagioclase (Ca,Na)[Al(Al,Si)Si2O8] in enderbite (charnockitic tonalite); Khlebodarivka quarry (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; 120 x 75 x 65 mm

Magnified surface of polished fenite – metasomatic rock containing the presence of pink alkali feldspar (microcline K(AlSi3O8)), dark grey, fibrous sodic amphiboles [riebeckite □Na2(Fe3Fe2)Si8O22(OH)2 or arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2] and black sodic pyroxene aegirine NaFeSi2O6; Khlebodarivka quarry (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; FOV: 35 mm

Crystal of mica [biotite K(Mg,Fe)3[AlSi3O10(OH,F)2] in camptonite (lampropyre with plagioclase > K-feldspar and feldspars > feldspathoids); Khlebodarivka quarry (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; 85 x 50 x 35 mm

Fenite – metasomatic rock characterized by the presence of pink alkali feldspar [microcline K(AlSi3O8)], dark grey, fibrous sodic amphiboles [riebeckite □Na2(Fe3Fe2)Si8O22(OH)2 or arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2] and black sodic pyroxene aegirine NaFeSi2O6; Chlebodarovsk (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; 95 x 60 x 40 mm

Black pyroxene aegirine NaFeSi2O6, greyish-green, fibrous sodic amphiboles [riebeckite □Na2(Fe3Fe2)Si8O22(OH)2 or arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2] and pink alkali feldspar [microcline K(AlSi3O8)] in fenite; Khlebodarivka quarry (Chlebodarovka carbonatite field), Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; FOV: 35 mm

Outcrops of taramitic foyaite, magnetite-bearing mariupolite (aegirine-albite nepheline syenite) and syenite nearby Lazarivka village.

Hills around Lazarivka vilage, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine

Taramitic foyaite contains beige crystal of nepheline (Na,K)AlSiO4, white K-feldspar K(AlSi3O8) and black amphibole var. taramite {Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2; Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; 80 x 65 x 40 mm

Pegmatitic mariupolite (aegirine-albite nepheline syenite) with gray nepheline (Na,K)AlSiO4 and white K-feldspar (microcline) K(AlSi3O8), field photo; Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine

Magnetite crystals FeFe2O4 in mariupolite (aegirine-albite nepheline syenite); Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; biggest crystal 20 mm

Gray nepheline (Na,K)AlSiO4 with black magnetite crystasl FeFe2O4 in mariupolite (aegirine-albite nepheline syenite); Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; magnetite crystal 12 mm

Halos of leucocratic rock around magnetite crystals FeFe2O4 in magnetite-bearing mariupolite (aegirine-albite nepheline syenite); Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; FOV: 80 mm

Magnetite crystals FeFe2O4 in magnetite-bearing mariupolite (aegirine-albite nepheline syenite); Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; 100 x 40 x 25 mm

Magnetite crystals FeFe2O4 in mariupolite (aegirine-albite nepheline syenite), field photo; Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine

Taramitic foyaite contains beige crystal of nepheline (Na,K)AlSiO4, white K-feldspar K(AlSi3O8) and black amphibole var. taramite {Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2, field photo; Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine

Beige crystal of nepheline (Na,K)AlSiO4 with white K-feldspar K(AlSi3O8) and black amphibole var. taramite {Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2 in taramitic foyaite; Lazarivka, Oktyabr’skii Massif (Mariupol’skii), Azov Sea Region, Donetsk (Donets’k) Oblast’, Ukraine; nepheline crystal 5 mm

References:

Morozewicz J.A. (1929): Mariupolit i jego krewniaki = Mariupolite et ses parents. – Prace Pol. Inst. Geol.: 151 pp.

Kryvdik S.G. (2002): Metallogeny of Alkaline Complexes of the Ukrainian Shield. Mineral. Journ. (Ukraine): 24(2/3): 58-64.

Krivdik S.G., Nivin V.A., Kul’chitskaya A.A., Voznak D.K., Kalinichenko A.M., Zagnitko V.N., Dubyna A.V. (2007): Hydrocarbons and other volatile components in alkaline rocks from the Ukrainian Shield and Kola Penisula. Geochemistry International: 45 (3): 270–294.

Dumańska-Słowik M., Sikorska M., Heflik W. (2011): Dissolved-recrystallized zircon from mariupolite in the Mariupol Massif, Priazovje (SE Ukraine). Acta Geologica Polonica: 61 (3): 277–288.

Dumańska-Słowik, M., Budzyń, B., Heflik, W., Sikorska, M. (2012): Stability relationships of REE-bearing phosphates in an alkali-rich system (nepheline syenite from the Mariupol Massif, SE Ukraine). Acta Geologica Polonica: 62: 247–265.

Ponomarenko A.N, Kryvdik S.G., Grinchenko A.V. (2013): Alkaline rocks of the Ukrainian Shield: Some mineralogical, petrological and geochemical features. Mineralogia: 44 (3-4): 115-124.

Voznyak D.K., Chernysh D.S., Melnikov V.S., Ostapenko S.S. (2013): Baddeleyite segregations in zircon of the Azov zirconium-rare-earth deposit (Ukrainian Shield). Mineralogia: 44 (3-4): 125-131.

Dumańska-Słowik M., Heflik W., Kromska A., Sikorska M. (2015): Sodic fenites of the Oktiabrski Complex exposed in the Khlibodarivka quarry (East Azov, SE Ukraine): reconstruction of their growth history. N. Jb. Geol. Paläont. Abh.:275/3: 269–283.

Sharygin, V.V. (2015): Zincian micas from peralkaline phonolites of the Oktyabrsky massif, Azov Sea region, Ukrainian Shield. European Journal of Mineralogy: 27(4): 521-533

Dumańska-Słowik M., Heflik W. (2016): Skały ultrazasadowe i zasadowe z otoczenia mariupolitów występujących w alkalicznym Masywie Oktiabrskim (SE Ukraina) – badania wstępne. Gospodarka surowcami mineralnymi – Mineral resources management: 32 (2), 63–78.

Dumańska-Słowik, M., Pieczka, A., Heflik, W., Sikorska, M. (2016): Cancrinite from nepheline syenite (mariupolite) of the Oktiabrski massif, SE Ukraine, and its growth history. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy: 157: 211-219.