| 苏鲁超高压造山带海州群锆石年龄及其地质意义 |
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| 关键词:zircon age Haizhou Group Sulu orogenic belt |
| 基金项目:本文得到973项目“大陆深俯冲作用”（编号：G1999075502）,国家教育部留学回国人员科研启动基金和中国科学院地质与地球物理研究所所长基金资助。 |
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| The Zircon Age of Haizhou Group in the Sulu Ultrahigh-Pressure Orogenic Belt and Its Geological Implications |
| The ultrahigh pressure collisional belt exposed in the Sulu terrane represents the eastern part of the Qjnling-Dabie orogenic belt that resulted from collision of Yangtze and North China blocks in early Mesozoic. Here zircon ages are reported for the lowergrade metamorphic Haizhou Group exposed in southern Sulu. This rock group is lithologically comparable with the Susong Group and the Hong'an Group exposed in the southern part of Dabie area. Zircons of schist samples collected from Haizhou Group were analysed by U-Pb isotopic dilution and evaporation methods. The analytical results suggest that these zircons crystallised between 800 Ma and 780 Ma. Zircon grains underwent different extents of superimposition, but most of them still preserve oscillatory zoning of magmatic origin, as demonstrated by the internal structure shown in the cathodoluminescence images. These age results are similar to those reported for the Susong LT/HP zone in Dabie terrane. |
| WANG Xiuli,CHEN Fukun,LI Qiuli,GUO Jinghui.2005.The Zircon Age of Haizhou Group in the Sulu Ultrahigh-Pressure Orogenic Belt and Its Geological Implications[J].Acta Geoscientica Sinica,26(z1):125. |
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