U-Pb zircon ages for the Luzhenguan Complex in northern part of the eastern Dabie orogen
The study presents U-Pb zircon ages for granitic gneiss and amphibolite from the Luzhenguan Complex (LZC) in northern part of the eastern Dabie Orogen and their geological significance. Two granitic gneisses and one amphibolite give protolith zircon U-Pb ages of 740 Ma and 725 Ma, respectively. The ages show that the LZC is composed mainly of Neoproterzoic acid and basic igneous rocks, suggesting that there is no Paleozoic active continental marginal rock association in the southern margin of the North China Block in northern part of the eastern Dabie Mountain. Based on the ages and combining the geological and geophysical analyses, the middle-low grade metamorphic rocks in the North Huiyang Belt (NHB) can be divided into three parts, which are the LZC composed mainly of the Neoproterzoic acid and basic igneous rocks, the Neoproterzoic Xianrechong Formation and Xiangyunzhai Formation and the Devonian Zhufoan Formation and Pangjialing Formation of the Foziling Group, and the suture zone between the Yongtze Block and the North China Block is inferred to be thrust under the NHB.
作 者： JIANG Laili Wolfgang Siebe CHEN Fukun LIU Yican CHU Dongru 作者单位： JIANG Laili,CHU Dongru(Geological Survey of Anhui Province, Hefei 230001, China)Wolfgang Siebe(Institut für Geowissenschaften, Universit(a)t Tübingen, Tübingen 72074, Germany)
CHEN Fukun(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China)
LIU Yican(School of Earth and Space, University of Science and Technology of China, Hefei 230026, China)
刊 名： 中国科学D辑(英文版) SCI 英文刊名： SCIENCE IN CHINA (EARTH SCIENCES) 年，卷(期)： 2005 48(9) 分类号： P3 关键词： Dabie orogen Luzhenguan Complex U-Pb zircon age Neoproterzoic