• 责任者：Luo Zhibo (Department of Geosciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Zhang Huafeng
• 刊名：Acta Petrologica Sinica
• 出版年：2012
• 卷期：28(11)
• 关键词：辉石麻粒岩 ; pyroxene granulite ; 河北 ; Hebei Province
• 页码：p.3721-3738
• 图表：8 illus., 3 tables, 96 refs.
• 分类号：0802
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

The Huai’an area of Northwest Hebei Province stands on the central-north of the North China Craton （NCC）.  Zircon U-Pb, Lu-Hf isotope and trace elements compositions are analyzed. As a result, zircon cores with oscillatory zoning exhibit various ²⁰⁷Pb/²⁰⁶Pb ages in range of 2 542～1 902 Ma （1σ）. They show a positive relations with Th/U （0.10～1.92） ratios, ΣHREE （59.1×10^-6～452×10^-6） and εHf（t） values, indicating their different degrees of lattice recrystallization due to the postdated metamorphism. Zircon grains with the most concordant and old ages yield a mean ²⁰⁷Pb/²⁰⁶Pb age of (2 471±18) Ma （2σ, MSWD=6.7）. The authors interpret this age to be the age of granulite to amphibolite retrograde metamorphism. The Ti-in-zircon temperatures record their formation temperatures in range of 683～714 ℃ which are highly consistent with the temperatures from granulite to amphibolite retrograde metamorphism. Therefore, the isotopic ages of 1 850～1 800 Ma might be representative of the stage of regional crust uplift postdating the Late Palaeoproterozoic cratonization.