| A combined study of SHRIMP U-Pb dating, trace element and mineral inclusions on high-pressure metamorphic overgrowth zircon in eclogite from Qinglongshan in the Sulu terrane |
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| 作者姓名： | LI Qiuli LI Shuguang HOU Zhenhui HONG Ji'an & YANG Wei School of Earth and Space Sciences University of Science and Technology of China Hefei China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China |
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| 作者单位： | LI Qiuli，LI Shuguang，HOU Zhenhui，HONG Ji'an & YANG Wei 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 |
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| 摘 要： | 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 nietamorphism for the Qinglongshan eclogite.
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| 关 键 词： | 年龄测定方法 微量元素 矿石 压力 变质结构 锆石 榴辉岩 岩层 |
| 收稿时间： | 22 June 2004 |
A combined study of SHRIMP U-Pb dating, trace element and mineral inclusions on high-pressure metamorphic overgrowth zircon in eclogite from Qinglongshan in the Sulu terrane |
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| LI Qiuli,LI Shuguang,HOU Zhenhui,HONG Ji''''an & YANG Wei School of Earth and Space Sciences,University of Science and Technology of China,Hefei ,China, Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China.A combined study of SHRIMP U-Pb dating, trace element and mineral inclusions on high-pressure metamorphic overgrowth zircon in eclogite from Qinglongshan in the Sulu terrane[J].Chinese Science Bulletin,2005,50(5):459-465. |
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| Authors: | Qiuli Li Shuguang Li Zhenhui Hou Ji’an Hong Wei Yang |
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| Institution: | (1) School of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, China;(2) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China |
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| Abstract: | 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. |
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| Keywords: | SHRIMP dating trace element mineral inclusions peak metamorphic time |
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