Zircon U-Pb Ages and Hf Isotopic Composition of Wenquan Rapakivi Granites from Northwestern Hebei Province

摘要：

　　Using LA-MC-ICP-MS method, this paper presents zircon U-Pb ages and Hf isotopic composition of Wenquan rapakivi granites from northwestem Hebei province.22 analytical spots yield 207pb/ 206pb ages ranging from 1743.52 to 1764.81Ma with weighted mean 207pb/ 206pb ages of 1749.5±3.4Ma(MSWD =0.53).The dating results imply that Wenquan rapakivi granites formed in Paleoproterozoic is compatible with the post-orogenic extensional tectonic setting of the continent continent collision between the Western and Eastern blocks of the North China craton at 1850Ma.εHf(t) values show a minor range from-4.68 to 5.02, with a mean value of-2.31.Two-stage Hf model ages range from 2122 to 2708 Ma, focusing on 2500 to 2708 Ma.These Hf isotopic features indicate that Wenquan rapakivi granites were mainly derived from recycling Neoarchean crust material, with a little join of mantle composition.

关键词： Wenquan rapakivi granites zircon U-Pb ages Hf isotopic composition North margin of North China Block

作者: HU Huabin TIAN Lifu CHENG Haijiao

作者单位: Shijiazhuang University of Economics,Shijiazhuang,P.R.050031,China

会议类型: 国际会议

会议名称: 第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)

会议地点: 石家庄

会议语种:英文

页码: 29-32

在线出版日期: 2013-09-20（万方平台首次上网日期，不代表论文的发表时间）