Integrated detrital rutile and detrital zircon ages:a new perspective on the tectonic evolution of South China  

作　　者：Hao Zou Hongkui Li Zhongquan Li Danlin Wang Inna Safonova Huawen Cao Xin Jin Haifeng Chen Changcheng Huang 

机构地区：[1]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China [2]College of Earth and Planetary Science,Chengdu University of Technology,Chengdu 610059,China [3]Faculty of Geoscience and Engineering,Southwest Jiaotong University,Chengdu 611756,China [4]Sobolev Institute of Geology and Mineralogy,Novosibirsk 630090,Russia

出　　处：《National Science Review》2024年第12期175-185,共11页国家科学评论(英文版)

基　　金：supported by the National Natural Science Foundation of China(42272129);the Outstanding Youth Science Fund Project of Sichuan Province(23NSFJQ0162);the Department of Natural Resources of Sichuan Province(KJ-2023-011);the Ministry of Science and Higher Education of Russia,State Assignment Project(122041400044-2);the Key R&D Program of Sichuan(Project#2022YFWZ0009);the Everest Scientific Research Program of Chengdu University of Technology.

摘　　要：Paleogeographic reconstructions are of key importance for understanding the history of continental breakups and amalgamations during Earth’s history.A special case is the history of the Asian continent,which,compared to other continents,consists of several large cratons and numerous smaller continental blocks.The history of the assembly of South China remains controversial in terms of the timing,Late Neoproterozoic or Early Paleozoic,and the participating continental blocks,e.g.Yangtze,Cathaysia,India and Australia.Detrital rutile U-Pb dating has significant potential with regard to deciphering tectonic settings as rutile frequently crystallizes during orogenic events associated with the processes of collision and subduction.Detrital zircon U-Pb dating is a perfect instrument for identifying the provenance characteristics and age characteristics of sedimentary sources.An integration of these two methods of dating offers better opportunities for reconstructing tectonic settings.This paper presents a first attempt to reconstruct the Neoproterozoic to Early Paleozoic tectonic history and paleogeography of the whole South China based on U-Pb geochronology of rutile and zircon and Hf-in-zircon isotopes from Lower Jurassic Baitianba Formation sedimentary rocks of the western margin of the Yangtze Block,a major part of South China.Our obtained integrated U-Pb rutile and zircon age data show three main age populations of 960-940 Ma,630-610 Ma and 530-520 Ma.The new U-Pb detrital rutile and zircon ages,compared with former data from Gondwana and Australia,suggest that Yangtze amalgamated with Cathaysia to form South China during the Sibao orogeny at 960-940 Ma.The detrital rutile and zircons of the new 630-610 Ma age group could have been delivered from western Australia during the Late Neoproterozoic to Cambrian Paterson-Petermann orogeny.The abundant 530-520 Ma detrital rutile and zircon ages fit well with the coeval zircon age populations recorded in Gondwana-derived terranes,like India and Indochina.

关 键 词：detrital rutile detrital zircon western Yangtze Block periods of orogeny PROVENANCE 

分 类 号：P542[天文地球—构造地质学] P597.3[天文地球—地质学] P531