Paleo-to Mesoproterozoic Tectono-Magmatic Events Recorded in the Huwan Complex from the Dabie Orogen,Central China:Evidence from Petrology and U-Pb Geochronology  

作　　者：ZHU Jiang CHEN Yuqiong CHEN Chao LI Zhanke SHI Xianbin CHEN Song ZOU Yuanbing 

机构地区：[1]College of Resources and Environment,Yangtze University,Wuhan 430100,China [2]Hubei Key Laboratory of Petroleum Geochemistry and Environment,Yangtze University,Wuhan 430100,China [3]Hubei Geological Survey,Wuhan 430034,China [4]Hubei Key Laboratory of Resources and Eco-environment Geology(Hubei Geological Bureau),Wuhan 430034,China [5]School of Earth Resources,China University of Geosciences,Wuhan 430074,China [6]Sixth Geological Brigade,Hubei Geological Bureau,Xiaogan,Hubei 432000,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第4期1150-1162,共13页地质学报（英文版）

基　　金：granted by National Natural Science Foundation of China(Grant No.42172103);China Geological Survey(DD20221645);Hubei Geological Bureau(KJ2023-11,KCDZ2022-06,KCDZ2023-01)。

摘　　要：To better understand the Paleo-to Mesoproterozoic tectonic evolution of the Dabie Orogen in the northern margin of Yangtze Block,we present geochronological data for metasedimentary and metavolcanic rocks in the Huwan complex.A total of 385 detrital zircon LA-ICP-MS analyses for metasedimentary rocks yielded three^(207)Pb/^(206)Pb age populations:1.50-1.80 Ga,1.81-1.87 Ga and 1.93-2.0 Ga,providing a maximum depositional timing of ca.1.50 Ga;while metafelsic volcanic gneisses yielded protolith U-Pb ages of 1893±54 Ma.The peak ages are remarkably consistent with the tectonothermal events that occurred in the northern Yangtze Block,indicating the presence of Paleo-to Mesoproterozoic magmatism in the Dabie Orogen.The age range of 1.93-2.0 Ga correlates with the Paleoproterozoic collision;the age range of 1.81-1.87 Ga coincides with the period of the post-orogenic extension;and the age range of 1.50-1.80 Ga is interpreted to associate with an extensional regime.Zircon cores with age of 1732-1965 Ma haveε_(Hf)(t)values ranging from-11.70 to-2.47,indicating that juvenile crust involved in their magma sources.Owing to the similar age spectra,we proposed that the nucleus of the Dabie Orogen was close to the Yangtze Block since the Paleoproterozoic.The Huwan complex has an intimate affiliation to the Yangtze Block,and implies multiple orogenic cycles.It was not only experienced the Paleo-Tethys ocean subduction and collision,but also recorded Paleo-to Mesoproterozoic tectono-magmatic events in the Dabie Orogen.

关 键 词：geochronology detrital zircon Huwan complex PRECAMBRIAN Yangtze block 

分 类 号：P542.2[天文地球—构造地质学] P534.3[天文地球—地质学]