TY - JOUR

T1 - Provenance of late Paleozoic sedimentary rocks in eastern Kazakhstan: Implications for the collision of the Siberian margin with the Kazakhstan collage

AU - Hu, Wanwan

AU - Li, Pengfei

AU - Sun, Min

AU - Safonova, Inna

AU - Jiang, Yingde

AU - Yuan, Chao

AU - Kotler, Pavel

N1 - Funding Information: This study was funded by the National Natural Science Foundation of China ( 41872222 and 42021002 ), the international partnership program of the Chinese Academy of Sciences ( 132744KYSB20200001 and 132744KYSB20190039 ), Hong Kong Research Grant Council ( HKU17302317 ), the Guangdong Province (project 2019QN01H101 ), and the Russian Science Foundation (project 21-77-20022 for Inna Safonova, tectonics; project 20-7710051 for Pavel Kotler, regional geology). We acknowledge Dan Wu and Le Zhang for the assistance of the analytical work. The manuscript benefits from the comments by Dongfang Song and an anonymous reviewer. This is a contribution of Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIG-CAS; No. IS-3091), Sobolev Institute of Geology and Mineralogy SB RAS (State Assignment # 033020190003), the Chemical Geodynamics Joint Laboratory between Hong Kong University and GIG-CAS as well as IGCP 662. Publisher Copyright: © 2021 Elsevier Ltd

PY - 2022/7/1

Y1 - 2022/7/1

N2 - To unravel when, where, and how multiple arc systems were amalgamated is crucial for understanding the accretion processes of the Central Asian Orogenic Belt. Here we focus on the collision of the Siberian margin and the Kazakhstan collage along the Char Shear/Suture Zone in eastern Kazakhstan. We conducted U–Pb dating and Hf isotope analysis for detrital zircons of clastic rocks across the collisional zone of the Siberian margin (the Irtysh-Zaisan Complex) and the Kazakhstan collage (the Zharma-Saur Arc and the Char Zone). Our results show that the Irtysh-Zaisan Complex carries abundant early Paleozoic detrital zircons and minor Precambrian zircons, but there is a lack of such zircon populations in the Zharma-Saur Arc and the Char Zone. Devonian to Carboniferous detrital zircons appear in all sampling tectonic units, in which εHf(t) values of Carboniferous zircons from the Zharma-Saur Arc and the Char Zone are characterized by a narrow range (∼10–17) that is different from a relatively wider range of εHf(t) values of ∼5–18 for the Carboniferous zircons in the Irtysh-Zaisan Complex. The distinct sedimentary provenances of the Irtysh-Zaisan Complex and the Zharma-Saur Arc/Char Zone confirm that their tectonic boundary lies along the Char Shear Zone in eastern Kazakhstan. As the Late Carboniferous sedimentary rocks from the Zharma-Saur Arc and the Char Zone do not receive detritus from the Siberian margin, we consider that the Ob-Zaisan Ocean between the Siberian margin and the Kazakhstan collage was closed later than the deposition of these sedimentary rocks (<321 Ma).

AB - To unravel when, where, and how multiple arc systems were amalgamated is crucial for understanding the accretion processes of the Central Asian Orogenic Belt. Here we focus on the collision of the Siberian margin and the Kazakhstan collage along the Char Shear/Suture Zone in eastern Kazakhstan. We conducted U–Pb dating and Hf isotope analysis for detrital zircons of clastic rocks across the collisional zone of the Siberian margin (the Irtysh-Zaisan Complex) and the Kazakhstan collage (the Zharma-Saur Arc and the Char Zone). Our results show that the Irtysh-Zaisan Complex carries abundant early Paleozoic detrital zircons and minor Precambrian zircons, but there is a lack of such zircon populations in the Zharma-Saur Arc and the Char Zone. Devonian to Carboniferous detrital zircons appear in all sampling tectonic units, in which εHf(t) values of Carboniferous zircons from the Zharma-Saur Arc and the Char Zone are characterized by a narrow range (∼10–17) that is different from a relatively wider range of εHf(t) values of ∼5–18 for the Carboniferous zircons in the Irtysh-Zaisan Complex. The distinct sedimentary provenances of the Irtysh-Zaisan Complex and the Zharma-Saur Arc/Char Zone confirm that their tectonic boundary lies along the Char Shear Zone in eastern Kazakhstan. As the Late Carboniferous sedimentary rocks from the Zharma-Saur Arc and the Char Zone do not receive detritus from the Siberian margin, we consider that the Ob-Zaisan Ocean between the Siberian margin and the Kazakhstan collage was closed later than the deposition of these sedimentary rocks (<321 Ma).

KW - Central Asian Orogenic Belt

KW - Char Shear Zone

KW - Detrital zircon

KW - Irtysh-Zaisan Complex

KW - Zharma-Saur Arc

UR - http://www.scopus.com/inward/record.url?scp=85118698442&partnerID=8YFLogxK

U2 - 10.1016/j.jseaes.2021.104978

DO - 10.1016/j.jseaes.2021.104978

M3 - Article

AN - SCOPUS:85118698442

VL - 232

JO - Journal of Asian Earth Sciences

JF - Journal of Asian Earth Sciences

SN - 1367-9120

M1 - 104978

ER -