№ 2, 2019

Accessory minerals as indicators of depth of magma generation and ore genesis within Dashkesan ore region (Lesser Caucasus, Azerbaijan)

Ismail-zadeh A.J., Kangarli T.N., Akhmadov A.M., Amirov A.S.

Institute of Geology and Geophysics of Azerbaijan National Academy of Sciences, 119, H. Javid av., Baku, AZ1143, Azerbaijan: arifismail@mail.ru, tkangarli@gmail.com, ahmedov.geo@gmail.com

Summary. Wustite (for the first time defined by authors in the territory of Azerbaijan) and native iron are found in the slag-like fragments of rocks (scorias) contained in the river alluvium above flood-plain terraces of Ganjachay and its small tributaries within the eastern periphery of Dashkesan trough (Lok-Garabagh zone of Lesser Caucasus). They represent following two types of burnt, dense and lumpy bubble-rocks: 1 – basaltoids with typical spinifex structure and native iron and magnetite content; 2 – granitoids with impregnations of the different-size fragments of wustites, as well as mag-netites, maghemites, etc. First type of the metal-bearing rocks corresponds to low-titanium and komatiite-like ferro-magnesian formations (pyroxene komatiites – ?), while the second type is represented by diorites-quartz diorites. Materials of the conducted research bring us to a conclusion that wustite and other metal-bearing formations are brought to a daylight through the hybrid magma with quartz-diorite composition which have formed through mixing of the palingenic granitoid magma with the serpentized rocks of buried ultrabasic plate. Studied samples represent fragments of a deep magmatic focus – ultrabasic rocks that had been recrystallized into komatiites (?) as well as fragments of the marginal zones of magma generation focus, e.g. melted granitoids with wustite, magnetite, maghemite, etc., ejected by an explosive activity of paleo volcanoes.

Keywords: Jurassic magmatism, scoria, native iron, wustite, spinifex structure

 

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DOI:10.33677/ggianas20190200028

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