TY - JOUR

T1 - The Kalba batholith dyke swarms (Eastern Kazakhstan): Mafic magmas effect on granite formation

AU - Khromykh, Sergey V.

AU - Vishnevskiy, Andrey V.

AU - Kotler, Pavel D.

AU - Antsiferova, Tatiana N.

AU - Semenova, Dina V.

AU - Kulikova, Anna V.

N1 - Funding Information: This research was carried out on a government assignment to the V.S. Sobolev Institute of Geology and Mineralogy (IGM SB RAS , Novosibirsk) and was supported by the Russian Foundation for Basic Research (Projects No. 20–05-00346, No. 20–35-70076). Publisher Copyright: © 2022 Elsevier B.V.

PY - 2022/10

Y1 - 2022/10

N2 - The Kalba granitoid batholith formed in Early Permian is one of the largest in the western part of the Central Asian Orogenic Belt. Batholith granites are intruded by mafic and intemediate dykes forming several swarms. Previously it was believed that the dykes were Mesozoic and had no relationship with the formation of the batholith. Our geochronological studies allow to determine the age of the dykes at 279 Ma (also Early Permian). Dyke rocks are represented by dolerites, variolites, monzodiorites, and plagioclase porphyrites. The petrographic study of plagioclase porphyrites allow to find the sign of magma mixing. The another indicator of magma mixing are the contacts between mafic and felsic rocks in largest dykes of complex structure. A model for the interaction of mafic magmas with crustal substrates is proposed. Mafic magmas intruded from sublithospheric mantle, provoked a partial melting and then interacted with granitic melts at the basement level of granite batholith. Dyke swarms were formed after the cooling and consolidation of main volume of Kalba batholith by inrtusion of mafic and hybride magmas from the basement level of granite batholith. Chemical diversity of the mafic dykes was caused mainly by the differentiation of parental mafic magmas and also a lesser extent by their interaction with the granitoid magmas. Comparison with data on coeval magmatism in neighboring regions suggests that the Kalba batholith may be included in areal of Early Permian Tarim Large Igneous Province.

AB - The Kalba granitoid batholith formed in Early Permian is one of the largest in the western part of the Central Asian Orogenic Belt. Batholith granites are intruded by mafic and intemediate dykes forming several swarms. Previously it was believed that the dykes were Mesozoic and had no relationship with the formation of the batholith. Our geochronological studies allow to determine the age of the dykes at 279 Ma (also Early Permian). Dyke rocks are represented by dolerites, variolites, monzodiorites, and plagioclase porphyrites. The petrographic study of plagioclase porphyrites allow to find the sign of magma mixing. The another indicator of magma mixing are the contacts between mafic and felsic rocks in largest dykes of complex structure. A model for the interaction of mafic magmas with crustal substrates is proposed. Mafic magmas intruded from sublithospheric mantle, provoked a partial melting and then interacted with granitic melts at the basement level of granite batholith. Dyke swarms were formed after the cooling and consolidation of main volume of Kalba batholith by inrtusion of mafic and hybride magmas from the basement level of granite batholith. Chemical diversity of the mafic dykes was caused mainly by the differentiation of parental mafic magmas and also a lesser extent by their interaction with the granitoid magmas. Comparison with data on coeval magmatism in neighboring regions suggests that the Kalba batholith may be included in areal of Early Permian Tarim Large Igneous Province.

KW - Central Asia

KW - Eastern Kazakhstan

KW - Granitic batholiths

KW - Mafic dykes

KW - Mantle-crust interaction

KW - Tarim Large Igneous Province

UR - http://www.scopus.com/inward/record.url?scp=85134153884&partnerID=8YFLogxK

U2 - 10.1016/j.lithos.2022.106801

DO - 10.1016/j.lithos.2022.106801

M3 - Article

AN - SCOPUS:85134153884

VL - 426-427

JO - Lithos

JF - Lithos

SN - 0024-4937

M1 - 106801

ER -