Age, Trace Elements and Hf-Isotope Composition of Zircon in Eclogites from the Sulu UHP Belt, East-Central China: Neoproterozoic Intrusion and Subsequent Paleozoic and Early Mesozoic Metamorphism

作者：Zheng Jianping^*; Tang Huayun; Zhao Junhong; Su Yuping; Yu Chunmei; Wei Qirong; Liu Qingsheng; Wu Xiuling

来源：Journal of Earth Science, 2010, 21(5): 598-622.

DOI：10.1007/s12583-010-0122-0

• age
• composition
• zircon
• eclogite
• Sulu UHP terrane
• East-Central China

The Sulu (sic)-Dabie (sic) orogen in East-Central China formed during the subduction and collision of the Yangtze block with the North China block in Early Mesozoic (240-225 Ma). Constraints on the nature and derivation of eclogites, which are a significant component of the orogen, can provide useful information about subduction-zone metamorphism and crust-mantle interaction. The U-Pb ages, Hf-isotope ratios and trace-element compositions of zircons in eclogites from the Jiangzhuang (sic) (Jiangsu (sic) Province) and Rongcheng (sic) (Shandong (sic) Province) areas indicate that the protoliths of the eclogites derived from ultramafic-mafic complexes or mafic intrusion in the subducted continental lithosphere. The upper intercept age of 852 +/- 10 Ma and high epsilon(Hf) (up to 14.7) of the Neoproterozoic zircons in a Jiangzhuang sample indicate that the protoliths represent products of the Neoproterozoic addition of juvenile materials to the older (i.e., Paleo-Mesoproterozoic) continental crust. The zircon ages of eclogites from both localities mainly record the Triassic (230-220 Ma) metamorphism, consistent with the formation of the Sulu orogen in Early Mesozoic. The lower intercept age of 316 4 Ma in a Jiangzhuang sample suggests that thermal activity relating to the paleo-Tethyan in Late Carboniferous also affected the eclogitic protolith.

• 出版日期2010-10
• 单位中国地质大学（北京）; 地质过程与矿产资源国家重点实验室