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U-Pb Ages and Hf Isotope of Zircons from a Carbonatite Dyke in the Bayan Obo Fe-REE Deposit in Inner Mongolia: its Geological Significance
投稿时间:2018-08-01  修订日期:2018-12-20  点此下载全文
引用本文:LAI Xiaodong,YANG Xiaoyong.2019.U-Pb Ages and Hf Isotope of Zircons from a Carbonatite Dyke in the Bayan Obo Fe-REE Deposit in Inner Mongolia: its Geological Significance[J].ACTA GEOLOGICA SINICA(English edition),93(6):1783~1796
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DOI:10.1111/1755-6724.14364
作者单位E-mail
LAI Xiaodong 1 School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong 528225, China tcllxd@126.com 
YANG Xiaoyong 2 CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026, China xyyang555@163.com 
 
Author NameAffiliationE-mail
LAI Xiaodong 1 School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong 528225, China tcllxd@126.com 
YANG Xiaoyong 2 CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026, China xyyang555@163.com 
Abstract:Detailed studies on U-Pb ages and Hf isotope have been carried out in zircons from a carbonatite dyke associated with the Bayan Obo giant REE-Nb-Fe deposit, northern margin of the North China Craton (NCC), which provide insights into the plate tectonic in Paleoproterozoic. Analyses of small amounts of zircons extracted from a large sample of the Wu carbonatite dyke have yielded two ages of late Archaean and late Paleoproterozoic (with mean 207Pb/206Pb ages of 2521±25 Ma and 1921±14 Ma, respectively). Mineral inclusions in the zircon identified by Raman spectroscopy are all silicate minerals, and none of the zircon grains has the extremely high Th/U characteristic of carbonatite, which are consistent with crystallization of the zircon from silicate, and the zircon is suggested to be derived from trapped basement complex. Hf isotopes in the zircon from the studied carbonatite are different from grain to grain, suggesting the zircons were not all formed in one single process. Majority of εHf(t) values are compatible with ancient crustal sources with limited juvenile component. The Hf data and their TDM2 values also suggest a juvenile continental growth in Paleoproterozoic during the period of 1940–1957 Ma. Our data demonstrate the major crustal growth during the Paleoproterozoic in the northern margin of the NCC, coeval with the assembly of the supercontinent Columbia, and provide insights into the plate tectonic of the NCC in Paleoproterozoic.
keywords:crustal growth, zircon U-Pb age, Hf isotope, Bayan Obo, North China Craton
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