TY - JOUR

T1 - Granitoids of the Kalba batholith, Eastern Kazakhstan: U–Pb zircon age, petrogenesis and tectonic implications

AU - Kotler, Pavel

AU - Khromykh, Sergey

AU - Kruk, Nikolay

AU - Sun, Min

AU - Li, Pengfei

AU - Khubanov, Valentin

AU - Semenova, Dina

AU - Vladimirov, Alexander

N1 - Funding Information: The work was carried out on a government assignment to the V.S. Sobolev Institute of Geology and Mineralogy SB RAS (Novosibirsk) and was financially supported by several institutions: Russian Foundation for Basic Research , Projects 20–35-70076 and 20–05-00346 ; Russian Science Foundation , Project # 20–77-10051 (isotope analysis); Hong Kong Research Grant Council , Projects HKU 17302317 and HKU17303415 ; Ministry of Science and High Education of the Russian Federation , Contract No. 14.Y26.31.0029 , Resolution No.220 of the Government of the Russian Federation. Publisher Copyright: © 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/5

Y1 - 2021/5

N2 - This is a synthesis of published and new data on the Kalba batholith in Eastern Kazakhstan, the large granitic body in the western part of the Central Asian Orogenic Belt. The batholith consists of granodiorite-granite and leucogranite rocks discriminated on the basis of major- and trace-element chemistry and isotope systematics. The granodiorite-granite rocks, which form the bulk of the batholith, are compositionally variable and can be classified as mixed S-I-type granites. The leucogranites occurring as a few large intrusions in the northwestern part of the batholith have more stable compositions, with high contents of REE, HFSE, F, Li, and B, typical of A-granites. Judging by the isotope systematics of the Kalba granites, compared with that of their potential parent rocks from the Kalba-Narym zone and its surroundings, the two groups originated by different mechanisms in two magmatic events. The granodiorite-granites were produced by large-scale melting of crustal material, including the metabasaltic basement and overlying metavolcanic and metasedimentary rocks. The origin of leucogranites was associated with low-degree partial melting of the deepest Kalba-Narym sediments under the effect of fluoride fluids. The batholith formation spanned about 21 myr: granodiorites and granites formed in the 297–286 Ma interval and leucogranites between 288 and 276 Ma. The ages of the two events bracket the intraplate postorogenic stage of the CAOB history that was coeval to the formation of the Tarim large igneous province.

AB - This is a synthesis of published and new data on the Kalba batholith in Eastern Kazakhstan, the large granitic body in the western part of the Central Asian Orogenic Belt. The batholith consists of granodiorite-granite and leucogranite rocks discriminated on the basis of major- and trace-element chemistry and isotope systematics. The granodiorite-granite rocks, which form the bulk of the batholith, are compositionally variable and can be classified as mixed S-I-type granites. The leucogranites occurring as a few large intrusions in the northwestern part of the batholith have more stable compositions, with high contents of REE, HFSE, F, Li, and B, typical of A-granites. Judging by the isotope systematics of the Kalba granites, compared with that of their potential parent rocks from the Kalba-Narym zone and its surroundings, the two groups originated by different mechanisms in two magmatic events. The granodiorite-granites were produced by large-scale melting of crustal material, including the metabasaltic basement and overlying metavolcanic and metasedimentary rocks. The origin of leucogranites was associated with low-degree partial melting of the deepest Kalba-Narym sediments under the effect of fluoride fluids. The batholith formation spanned about 21 myr: granodiorites and granites formed in the 297–286 Ma interval and leucogranites between 288 and 276 Ma. The ages of the two events bracket the intraplate postorogenic stage of the CAOB history that was coeval to the formation of the Tarim large igneous province.

KW - Central Asian Orogenic Belt

KW - Granite batholith

KW - Granite sources

KW - Petrogenesis

UR - http://www.scopus.com/inward/record.url?scp=85101642533&partnerID=8YFLogxK

U2 - 10.1016/j.lithos.2021.106056

DO - 10.1016/j.lithos.2021.106056

M3 - Article

AN - SCOPUS:85101642533

VL - 388-389

JO - Lithos

JF - Lithos

SN - 0024-4937

M1 - 106056

ER -