TY - JOUR

T1 - Model of the Formation of Monzogabbrodiorite–Syenite–Granitoid Intrusions by the Example of the Akzhailau Massif (Eastern Kazakhstan)

AU - Kotler, P. D.

AU - Khromykh, S. V.

AU - Zakharova, A. V.

AU - Semenova, D. V.

AU - Kulikova, A. V.

AU - Badretdinov, A. G.

AU - Mikheev, E. I.

AU - Volosov, A. S.

N1 - Generalization and analysis of obtained materials were made in the framework of the government-financed program of the Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences. Petrographic studies, analysis of major and trace elements were supported by the Russian Science Foundation (project no. 21-17-00175). U-Pb and Ar-Ar isotope dating was supported by the Russian Science Foundation (project no. 22-77-00061), analysis of Rb-Sr and Sm-Nd isotope composition was carried out in the framework of the grant from the President of the Russian Federation (MK-1870.2022.1.5).

PY - 2024/4

Y1 - 2024/4

N2 - This paper presents a model of the formation of a multiphase Akzhailau granitoid massif formed within a Caledonian block of the Earth’s crust in the Hercynian time. This work is based on the results of major and trace element composition, geochronological, mineralogical and isotope-geochemical studies. Three stages of the formation of the Akzhailau massif are distinguished, which differ significantly from the previously accepted concepts about the multicomplex and polychronous origin of this intrusion: (1) the formation of moderately alkaline A2-type leuсogranites (308–301 Ma); (2) intrusion of monzodiorites into the base of leucogranites (~295 Ma), increasing degree of partial melting of protoliths with the formation of syenites and moderately alkaline granites of I-type (294–292 Ma); (3) intrusion of dikes and small bodies of alkaline ferroeckermannite A1-type leucogranites in the west and north of massif (~289 Ma). The Akzhailau massif was formed within about 15 Myr in the middle–upper crust through the interaction of plume-related subalkaline basitic magmas with metamorphosed crustal protolith of the orogenic structure.

AB - This paper presents a model of the formation of a multiphase Akzhailau granitoid massif formed within a Caledonian block of the Earth’s crust in the Hercynian time. This work is based on the results of major and trace element composition, geochronological, mineralogical and isotope-geochemical studies. Three stages of the formation of the Akzhailau massif are distinguished, which differ significantly from the previously accepted concepts about the multicomplex and polychronous origin of this intrusion: (1) the formation of moderately alkaline A2-type leuсogranites (308–301 Ma); (2) intrusion of monzodiorites into the base of leucogranites (~295 Ma), increasing degree of partial melting of protoliths with the formation of syenites and moderately alkaline granites of I-type (294–292 Ma); (3) intrusion of dikes and small bodies of alkaline ferroeckermannite A1-type leucogranites in the west and north of massif (~289 Ma). The Akzhailau massif was formed within about 15 Myr in the middle–upper crust through the interaction of plume-related subalkaline basitic magmas with metamorphosed crustal protolith of the orogenic structure.

KW - Central Asia

KW - Eastern Kazakhstan

KW - granitoids

KW - mantle-crust interaction

KW - multiple-phase intrusions

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85191089046&origin=inward&txGid=45be76cf44c8eabd10d4ae8ec743522b

UR - https://www.mendeley.com/catalogue/84d44f55-fcd5-309d-9b13-9cf028e43eb5/

U2 - 10.1134/S086959112402005X

DO - 10.1134/S086959112402005X

M3 - Article

VL - 32

SP - 179

EP - 200

JO - Petrology

JF - Petrology

SN - 0869-5911

IS - 2

ER -