U-Pb dating of early Mesozoic granodioritic intrusions in southeastern Hunan Province, South China and its petrogenetic implications

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 a...

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Bibliographic Details
Published in:Science China. Earth sciences 2002-03, Vol.45 (3), p.280-288
Main Authors: Wang, Yuejun, Fan, Weiming, Guo, Feng, Li, Huimin, Liang, Xinquan
Format: Article
Language:English
Subjects:
Basement rock
Basements
Cambrian
China
Copper
Crystallization
Dating
Geochronometry
Geology
Grains
granodioritic
Heavy metals
implications
intrusions
Lava
Lead isotopes
Magma
Mesozoic
Mineralization
Oceanic crust
petrogenetic
Precambrian
Radiometric dating
Rocks
South
U-Pb
Zircon
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Summary: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.
ISSN:1674-7313
1006-9313
1869-1897
1862-2801
DOI:10.1360/02yd9030