THE CHEMICAL COMPOSITION OF AMPHIBOLES FROM FENITIZATION HALO ROCKS OF CHERNIHIVKA CARBONATITE MASSIF OF AZOV REGION (THE UKRAINIAN SHIELD)

UDC 549.643.2/.3

https://doi.org/10.15407/mineraljournal.38.04.032

N.G. Yurchenko
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Av., Kyiv-142, Ukraine, 03680
E-mail: Nadysya88@gmail.com
THE CHEMICAL COMPOSITION OF AMPHIBOLES FROM FENITIZATION HALO ROCKS OF CHERNIHIVKA CARBONATITE MASSIF OF AZOV REGION (THE UKRAINIAN SHIELD)
Language:
Ukrainian
Mineralogical journal 2016, 38 (4): 32-38

Abstract: Amphiboles composition from crystalline rocks of Novopoltavska area basement within Chernihivka fault zone (West Azov region), that contain Chernihivka massif of alkaline ultrabasic rocks and carbonatites (fenites, syenites, micaceous ultrabasites, carbonatites) etc., has been analyzed. Two groups of amphiboles have been found in these rocks: the first, more ancient group is associated with the migmatization stage of granulite complex; the second, younger one — with the fenitization halo formation around the carbonatite massif. The calcium subgroup amphiboles belong to the migmatization stage (magnesio-hornblende). The sodium-calcium subgroup amphiboles are typical of the fenitization stage. The direction of basement rocks mineral composition change depends primarily on migmatization process character and enderbite (plagiogranulite) complex granitization intensity, which precede the Chernihivka deep-seated fault inception and the alkaline-ultrabasic linear massif with carbonatites and fenitization halo formation within it. The migmatization stage is characterized by magnesio-hornblende and edenite formation associated with biotite in rocks, and potassic-bearing varieties of these amphiboles within intensive feldspathization places. Sodium varieties of calcium amphiboles with gradual transformation into sodium-calcium (catophorite, taramite) dominate in fenite halo.

Keywords: Ukrainian Shield, West Azov region, Chernihivka carbonatite massif, fenite halos, amphiboles, typochemism.

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