| Single zircon LA-ICPMS U-Pb dating of Weishan granite (Hunan, South China) and its petrogenetic significance |
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| 基金项目： | 国家自然科学基金;教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | It is well-known that South China experienced suc- there are also the Indosinian granitoids in Jiangxi, cessively two important tectonic movements during Guangdong, Guangxi, Hainan and so on4], most of Mesozoic time, i.e. Indosinian and Yanshanian move- them, in the mass, are fairly concentrated in Hunan ment1], which yield widely-distributed granitoids and Province, in which the Indosinian granites outcrop abundant mineral resources2]. Therefore, the geologic over an area of ca. 5000 k…
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| 收稿时间： | 11 October 2004 |
| 修稿时间： | 26 April 2005 |
Single zircon LA-ICPMS U-Pb dating of Weishan granite (Hunan, South China) and its petrogenetic significance |
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| Authors: | DING Xing CHEN Peirong CHEN Weifeng HUANG Hongye ZHOU Xinmin |
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| Institution: | 1. Department of Earth Science, Nanjing University, Nanjing 210093, China
2. Research Institute No.230, CNNC, Changsha 410011, China |
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| Abstract: | A detailed microstructure analysis and LA-ICPMS U-Pb dating have been done for zircons of Weishan granite from Hunan Province,
South China. The results indicate that the Weishan granite is a multistage batholith formed during the late Indosinian-early
Yanshanian time. The intruded time of the late Indosinian granite is 211.0±1.6Ma and 215.7±1.9Ma (two samples), whereas that
of the early Yanshanian granite is 187.4±3.5Ma and 184.5±5.1Ma (two samples). In combination with other geochronological data
for Indosinian rocks of South China and the adjacent region, it is inferred that the late Indosinian granites of South China
(especially Hunan Province) are probably formed under extension regime as a consequence of post-collision stress relaxation,
which is a spontaneous response to intracontinental thickening attributed to the collision and extrusion of two Indosinian
seams, namely Qinling-Dabie and Song Ma. Moreover, it is also deduced that the early Yanshanian granites of Hunan Province
could not be directly related with the subduction of Paleo-Pacific plate towards Eurasian continent, and they are most likely
derivation of the mid-or lower-crustal materials because of decompressional melting under the continuous extension setting. |
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| Keywords: | CL images LA-ICPMS U-Pb dating granite Weishan Hunan |
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