| 庐山前震旦纪岩石中锆石U—Pb法定年与其地质意义 |
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| 引用本文： | 谢国刚,李均辉,李武显,唐红峰,李惠民,周新民.庐山前震旦纪岩石中锆石U—Pb法定年与其地质意义[J].地质科学,1997,0(1):110. |
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| 作者姓名： | 谢国刚 李均辉 李武显 唐红峰 李惠民 周新民 |
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| 摘 要： | 庐山前震旦系由星子群、双桥山群和筲箕洼一汉阳峰组地层构成。通过对庐山前震旦系中锆石U-Pb法定年测定,星子群的斜长角闪岩中锆石的U-Pb法定年结果是1 869±40Ma,由此表明星子群是晚元古代江南造山带的最古老结晶基底;筲箕洼-汉阳峰组中细碧岩和流纹岩的锆石U-Pb法定年结果,分别是917±36Ma和878±51Ma。它们在时代上与邻区登山群、井潭组、松木坞组和上墅组中细碧岩/玄武岩和流纹岩相当,是江南晚元古造山带的重要组成;侵入于星子群和双桥山群的辉绿岩岩墙群中的锆石U-Pb法定年结果是793±156Ma,它是上述造山带的最后岩浆活动的产物。此外,还讨论了"庐山飞来峰"问题。
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| 关 键 词： | 锆石U-Pb法定年 前震旦纪岩石 庐山 |
| 修稿时间： | 1995-11-01; |
U-Pb ZIRCON DATING OF PRESINIAN ROCKS AT LUSHAN MT.AND ITS GEOLOGICAL IMPLICATION |
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| Xie Guogang,Li Junhui,Li Wuxian,Tang Hongfeng,Li Huimin,Zhou Xinmin.U-Pb ZIRCON DATING OF PRESINIAN ROCKS AT LUSHAN MT.AND ITS GEOLOGICAL IMPLICATION[J].Chinese Journal of Geology,1997,0(1):110. |
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| Authors: | Xie Guogang Li Junhui Li Wuxian Tang Hongfeng Li Huimin Zhou Xinmin |
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| Institution: | 1. Jiangxi Geological Intestigation Party. Xiangiang 330201;2. Department of Earth Sciences. Nanjing University, Nanjing 210093;3. Tiangjin Institute of Geology and Mineral Resources, Tianjin 300170 |
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| Abstract: | In this paper the dating results of Presinian system of Lushan Mt. by means of the U-Pb zircon method are reported. The Presinian system in Lushan Mt. is composed of Xingzi group, Shuangqiaoshan group and Shaojiwa-Hanyangfeng formation. The U-Pb zircon age of plagioclase amphibolite of Xingzi group is 1869?40Ma, implying that it is the oldest crystallization basement of late-Proterozoic Jiangnan Orogenic Belt. The age values of spilite and rhyolite of Shaojiwa-Hanyangfeng formation are 917?36Ma and 878?51Ma, respectively, which correspond to those of spilites /basalts and rhyolites of Dengshan group, Jingtan formation, Songmuwu formation and Shangshu formation in the neighboring region. These volcanic series are the important members of this oroganic belt. the U-Pb zircon age value of diabase swarm that intruded into Xingzi group and Shuangqiaoshan group is 793?156Ma, suggesting that they are the last products of magmatism. Also, the problem of "Lushan klipple" is discussed. |
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| Keywords: | U-Pb zircon dating Presinian rocks Lushan Mt |
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