U—Pb Dating of Marble Assoicated With Eclogite from the Dabie Mountains,East China |
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摘 要: |
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关 键 词: | 大陆碰撞 板块会聚 铀铅同位素年龄 中国东部 大别山 大理石 榴辉岩 |
U-Pb dating of marble associated with eclogite from the Dabie Mountains, East China |
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Authors: | Yongfei Zheng Bin Fu Bing Gong Yilin Xiao Ningjie Ge |
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Institution: | (1) Department of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei |
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Abstract: | Marble is associated with ultrahigh pressure eclogite in the Dabie Mountains, East China. U-Pb isotope data for the marble
define a238U-206Pb isochron age of 435 ± 45 Ma with an initial206Pb/204Pb value of 18.075 ± 0.006. The age of ∼435 Ma is interpreted to represent the time of limestone diagenesis rather than the
time of metamorphic resetting accompanied by the formation of the ultrahigh pressure eclogites at Triassic. The paleontologic
and stratigraphic studies also favor a local excursion in the carbon isotopic composition of the latest Ordovician water within
a sedimentary basin between the Sino-Korean and Yangtze cratons. Because the latest Ordovician limestone was involved in the
eclogite formation, the continental collision between the Yangtze and Sino-Korean plates would postdate Ordovician.
This project was financially supported by the National Natural Science Foundation of China and the Chinese Academy of Sciences. |
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Keywords: | continental collision plate convergence U-Pb dating marble and eclogite ultrahigh pressure metamorphism the Dabie Mountains |
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