Constraints of zircon Hf isotopes on ancient crustal reworking in the Early Paleozoic Altai accretionary wedge, Central Asian Orogenic Belt

Broussolle, Arnaud; Jiang, Yingde; Sun, Min; Yang, Yu; Wong, J.; Shu, Tan; Xu, Kang

doi:10.1016/j.jseaes.2020.104538

Cited by 9 publications

(1 citation statement)

References 103 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Comparison of KDE of all new U‐Pb zircon data and binary plots of all new hafnium isotopic data (a) obtained in this study; and all previous U‐Pb and Hf isotopic data from (b) the Mongolian Altai Zone (U‐Pb: Burenjargal et al., 2016; Cai et al., 2015; Jiang et al., 2012, 2017; Hanžl et al., 2016; Long et al., 2020; Soejono et al., 2017, 2018 and zircon‐Hf: Cai et al., 2015; Janoušek et al., 2018; Long et al., 2020; Jiang et al., 2012, 2017) (c) and the Chinese Altai Zone (U‐Pb: Broussolle et al., 2018; Cai et al., 2011a; Cai et al., 2011b; Dong et al., 2018; Jiang et al., 2011; Long et al., 2007; Sun et al., 2008, 2009; Y. Wang et al., 2014 and zircon‐Hf: Broussolle et al., 2020; Cai et al., 2011a; Cai et al., 2011b; Jiang et al., 2011; Long et al., 2007; Sun et al., 2008, 2009). …”

Section: Discussionmentioning

confidence: 99%

Paleozoic Geodynamics and Architecture of the Southern Part of the Mongolian Altai Zone

et al. 2022

View full text Add to dashboard Cite

The Mongolian Altai Zone of the Central Asian Orogenic Belt has been traditionally interpreted as a mosaic of Paleozoic magmatic arcs, back‐arcs, and Precambrian continental terranes. In order to define its architecture and its tectonic evolution, three domains previously interpreted as terranes were investigated. The findings show that the Northern and Central domains are formed by a metamorphic sequence characterized by Barrovian S1 fabric transposed by recumbent folds and dominant sub‐horizontal amphibolite facies S2 schistosity. The latter is associated with the intrusions of late Devonian syntectonic granite sheets and anatexis in the south. The Southern domain is formed by early Permian migmatites and anatectic granites separated from the metamorphic envelope by amphibolite to green‐schist facies D3 shear zone cross‐cutting S2 fabrics. All domains have been reworked by E‐W upright folds associated with axial‐planar greenschist facies cleavage, reflecting the final mid‐Permian to Triassic D4 shortening. Lithological, geochemical, and U‐Pb zircon analyses of metasediments of all domains indicate that they are formed by Ordovician mature quartzite derived from Precambrian basement intruded by Cambrian‐Ordovician continental arc and Silurian immature graywacke which originated through erosion of an oceanic arc. Altogether, the whole sequence represents a fore‐arc basin in front of a migrating arc affected by thickening and late Devonian extension. The Southern domain is interpreted as an early Permian core complex amplified by mid‐Permian to Triassic compression. The apparent “terrane” architecture of the Mongol Altai Zone originated due to Devonian and Permian heterogeneous reworking of a giant Ordovician to Silurian fore‐arc basin.

show abstract