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《Acta Petrologica Sinica》 2002-03
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U-Pb and Sm-Nd isotopic ages of an alkaline syenite complex body in Liangtun-Kuangdongguo, Gai County, Liaoning Province, China and their geological significance.

Cai JH, Yan GH, Mu BL, Xu BL, Shao HX and Xu RH. 2002. 1. Faculty of Earth and Space Sciences, Peking University, Beijing 100871, China2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China 3. Institute of Geology and Geophysics, Chinese Academy of Scineces, Beijing 100029, China  
The complex body in Liangtun Kuangdongguo, Liaoning Province, China, mainly consists of alkaline rocks such as pyroxene syenite, aegirite augite syenite and aegirite augite hornblende syenite. According to the previous whole rock Rb Sr isochron age data of 1866±115Ma with I Sr = 0.7049, it is the oldest alkaline syenite reported in China up to now. The data of Zircon U Pb and whole rock Sm Nd data reported in this paper show that the complex body has a U Pb isotopic age of 1857±20Ma, and a whole rock Sm Nd isochron age of 1787±180Ma, with a ε Nd ( t ) value between -4.8 and -5.0. This means that the complex originated from enriched mantle material, with the upper limit age of 1857±20Ma. So the authors suggest that during early Proterozoic era an enriched mantle reservoir existed in the North China platform, and the main part of the Liaohe Group was formed before 1900Ma.
【Fund】: 国家自然科学基金项目 ( 4 0 0 72 0 2 4493 73 170 )资助
【CateGory Index】: P588.15
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