Structural Deformation Characteristics and Its Implications of Meso-to Neoproterozoic Sedimentary Strata in the Altyn Tagh Orogenic Belt
Hao Jiangbo
Li Yuke
Wang Chao
Ji Wenbin
Qiao Yuandong
Yu Zunpu
Sun Xiaokui
Zhang Shuai
Abstract：To elucidate the Meso-Neoproterozoic tectonic evolution associated with the amalgamation and breakup of the Rodinia supercontinent in the Altyn Tagh Orogenic Belt,the field geological mapping is conducted and the structural analysis is carried out on the Taxidaban Group(1 080-950 Ma)and Suoerkuli Group(～930 Ma)in the region.The results show that the Taxidaban Group comprises low greenschist-facies para-metamorphic rocks subjected to three phases of deformation:(1)The D1 phase is characterized by pervasive schistosity S1 transposing primary bedding S0;(2)the D2 phase developed WNW-ESE trending folds and crenulation cleavage S2 under NNE-SSW compression;(3)the D3 phase presents as NW-SE directed thrust faults and upright folds induced by SE-NW compression.The Suoerkuli Group unconformably overlies the Taxidaban Group,exhibiting distinct discontinuities in depositional environments and structural deformation between the two units.Integrating lithological compositions,deformation sequences,and spatiotemporal distribution of early Neoproterozoic magmatic rocks with their tectonic settings,this study proposes that the Altyn region completed a tectonic transition from an active continental margin to post-collisional extension during the late Mesoproterozoic to early Neoproterozoic.The findings provide critical evidence for constraining its relationship with Rodinia supercontinent cycles and paleogeographic affinity.
Keywords：The Altyn Tagh Orogenic BeltMeso- to Neoproterozoictectonic deformationtectonic evolutionsedimentologypetrology
Publication Date：2025-09-30
Online Publishing Date：2025-10-15(First online date of this platform, not the publication date of the document)
Pages：12( 3679-3690 )