U-Pb dating of early Mesozoic granodioritic intrusions in southeastern Hunan Province, South China and its petrogenetic implications |
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Authors: | Yuejun Wang Weiming Fan Feng Guo Huimin Li and Xinquan Liang |
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Institution: | 1. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013, China 2. Tianjin Institute of Geology and Mineral Resources, Ministry of Land and Resource, Tianjin 310170, China |
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Abstract: | The NE-trended Mesozoic granodioritic intrusions are spatially and temporally associated with the copper multi-metal mineralization
in southeastern Hunan Province, South China. U-Pb dating result of single-grained zircons of four samples respectively from
Shuikoushan, Baoshan, western Tongshanling and eastern Tongshanling intrusions reveals that their crystallization age spans
a range from 172 Ma to 181 Ma, which also represents the oldest age of the regional copper multi-metal mineralization. Some
of the zircon grains give an upper intercept age of about 1753 Ma and 207Pb/206Pb apparent age of (1752 ± 4) Ma, implying the involvement of the pre-Cambrian metamorphic (possible Middle Proterozoic) basement
in their genesis. The presence of such a kind of zircon grains in these granodiorites indicates either that the parental magmas
were assimilated by basement rocks during magma ascent or that lower/middle crustal rocks were one of the important components
during the melting process. |
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Keywords: | zircon U-Pb dating granodioritic intrusions petrogenetic implications South China |
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