A combined study of SHRIMP U-Pb dating, trace element and mineral inclusions on high-pressure metamorphic overgrowth zir
Methods recently advanced for discrimination on the genesis of metamorphic zircon, such as analysis of mineral inclusions and trace elements, provide us powerful means to distinguish zircon overgrowth during high-pressure metamorphism. Zircons in ultrahigh-pressure eclogite from Qinglongshan in the Sulu terrane were studied by the SHRIMP U-Pb method in combining with trace element and mineral inclusion analyses. No inherited core was identified in the analyzed zircons by means of cathodoluminescence images. The occurrence of high-pressure metamorphic mineral inclusions in zircon, such as garnet, omphacite, rutile, and the flat HREE pattern in zircon indicate that the zircon formed at high-pressure metamorphic conditions. Therefore, a weighted average U-Pb age of 227.4 ± 3.5 Ma obtained from such a kind of zircon is interpreted to represent the timing of peak metamorphism for the Qinglongshan eclogite.
作 者： LI Qiuli LI Shuguang HOU Zhenhui HONG Jian YANG Wei 作者单位： LI Qiuli(School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China)LI Shuguang,HOU Zhenhui,HONG Jian,YANG Wei(School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China)
刊 名： 科学通报（英文版） SCI 英文刊名： CHINESE SCIENCE BULLETIN 年，卷(期)： 2005 50(5) 分类号： 关键词： SHRIMP dating trace element mineral inclusions peak metamorphic time