• 责任者：Lei Nengzhong (State Key Laboratory of Geological Processes and Mineral Resources ; Faculty of Earth Sciences ; China University of Geosciences ; Wuhan 430074 ; China) ; Wu Yuanbao
• 刊名：Journal of China University of Geosciences
• 出版年：2008
• 卷期：19(2)
• 关键词：zircon ; granulite facies ; metamorphism ; Paleoproterozoic ; fluid availability
• 页码：p.110-134
• 图表：8 illus., 4 tables, 93 refs.
• issnNo：ISSN1002-0705
• isbnNo：CN42-1279/P

  Zircon   U-Pb   age,   trace   elements,   and   Hf   isotopes   were   determined   for   granulite   and gneiss at Huangtuling, which is hosted by ultrahigh-pressure metamorphic rocks in the Dabie orogen,   east-central   China.   Cathodoluminescence   (CL)   images   reveal   core-rim   structure   for most zircons in the granulite. The cores show oscillatory zoning, relatively high Th/U and ¹⁷⁶Lu/¹⁷⁷Hf  ratios, and high rare earth element (HREE)-enriched pattern, consistent with magmatic origin. They gave a weighted mean ²⁰⁷Pb/²⁰⁶Pb age of (2 766±9) Ma, dating magma emplacement of protolith. The rims   are  characterized    by  sector   or   planar   zoning,  low  Th/U  and ¹⁷⁶Lu/¹⁷⁷Hf    ratios,  negative  Eu anomalies and flat HREE patterns, consistent with their formation under granulite-facies metamorphic conditions.   Zircon   U-Pb   dating   yields   an   age   of  (2   029±13)   Ma,   which   is   interpreted   as   a   record   of  metamorphic event during the assembly of the supercontinent Columbia. The gneiss has a protolith age to   the   zircon  U-Pb   age   for   the   granulite-facies   metamorphism, suggesting    complementary      processes  to  granulite-facies   metamorphism      and   partial  melting.