Borodika, N. I.

Borodina, Nadezhda I.

Gertner, I. F.

Kotelnikov, A. D.

Makarenko, Nikolai A.

English

Tomsk State University Repository

G oldsdm iidt2015 AbstractsSources and geodynamics of Early Paleozoic Gabbro-Monzodiorite intrusions of the Kuznetsk Alataii Ridge, SiberiaV , V . VRUBLEVSKH  ^, a . D , KOTEL'NIKOV,N. A . MAKASENKO, N . I. BORODIKA AND I F. GERTNERTomsk State Umvetsm^ Russia (*vasw<l-yaiidexjai)Tlieie is die Kuznetsk A atau Caledonian teixaue in tlie ’n'esteni part of the CeuU'al Asian otogenic belt. It is belie^'ed that its tectonic evolution took place mostly in die island-arc geod^’iianiic em'ironinent and ^^’as accompanied by Eaiiy Paleozoic eranitoid and mafic inaamatism. Т кет  ate manv«_• 4_  -■iimoisive massifs (up to 40-60 km^) on the Eastern slope of the Kuznetsk Alatau u'lthin the Batenev Ridge, 't^luch are considered to be derb'atives of a eabbto-monzodioiite formatiou. Subalkaline gabbroids, later monzodiorites, and moiizomtes are dominant in the composition of these massifs. They fomi homodi'ome liieh-K calc-alkalnie masmatic senes.^  1_- 4_Isotope U-Pb dating (SHREMP-II) of zircons in these rocks that we earned out sho’n-ed diat these massifs ^'ere formed at - 500—IS5 Ma. Some granitoid associations in the region have similai' age.Studied rocks have similar HFSE distribution and ratio to island-arc basalts and just like them are characterized by Nb- Ta and Zr-Hf spectmm miuiimmis of subduction volcanites Observed complementarity’ of geochemical specmuns indicates fractioning of melts in hitemiediate chambers Unlike gabbi o, monzomtoids are sigmficantly enriched ui Cs, Rb, Ba, U. Th, Sr, REE diat might indicate influence of inuaplate OIB-type magmatic soiu'ce and less of continental crust. Variations in isotope composition of the rocks (eNd - -1-3,4...+3,9; eSr -  +3...-bll) suggest participation of heterogeneous matter m magma fomiation, they indicate possible mixing of mantle (PREMA+EM) and crust matter. Early Paleozoic granitoids and alkaline-mafic intrusions of the Kuznetsk Alatau have similar parameters, thus suggestmg the same natiu'e for parental magma sources at Cambiian-Ordo^’ician stage of its geological evolution. Tlie data obtained demonstrate possibility of g abbro-monzodioiite plutomc complexes to be formed imder fieodvnamic settings ’^ 'here active continental mai'gin was interacting with mantle plume.This study was supported by the Mimstvy o f Education and Science o f the Russian Federation and by the Program for  Competitive Growth o f Tomsk State University 2013-2020.This study was supported by the Ministjy o f Education and Science o f the Russian Federation and by the Program far  Competitive Growth o f Tomsk State University 2013-2020.3292

Sources and geodynamics of Early Paleozoic Gabbro Monzodiorite intrusions of the Kuznetsk Alatau Ridge, Siberia

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Sources and geodynamics of Early Paleozoic Gabbro Monzodiorite intrusions of the Kuznetsk Alatau Ridge, Siberia

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