Tectonic Response of the Kwangsian Orogeny in the Northern Margin of the South China Block:Evidences from Biostratigraphy
Wang Xin
Gao Xiaofeng
Zha Xianfeng
Abstract：There is still much debate on whether the Kwangsian Orogeny involved in the northern margin of the South China Block,which consequently restricts our understanding of the tectonic dynamics.In this research,the biostratigraphic and petrological evidence from the North Daba Mountains indicates that the tectonic-sedimentary marks the Kwangsian Orogeny in the north margin of the South China Block. Here,the Kwangsian initiated at Spirograptus turriculatus Biozone (Telychian stage,Silurian),consistent with the first episode of the "Yangtze uplift" (～435 Ma),and it reached the peak of the tectonic activity for the first time at Oktavites spiralis-Cyrtograptus lapworthi Biozone (Telychian stage,Silurian) accompanied with the～433 Ma intensive magmatism.This study further expands the tectonic scope of the Kwangsian Orogeny to the north margin of the South China Block,providing important new insights into the tectonic model and dynamics.It is suggested that the distant effects of the collision between the North China Block and South China Block may be one of the important tectonic driving force of the Kwangsian Orogeny.
Keywords：Kwangsian Orogenynorthern margin of the South China Blocktectonic responsestratigraphySiluriansedimentology
Publication Date：2024-09-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 3199-3211 )