地质通报2017，Vol.36Issue(2)：392-401,10.
晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义
LA-ICP-MS zircon U-Pb dating and Hf isotopic compositions of rocks from the Sushui com-plex in Shanxi-Shaanxi border area and their geological significance
摘要
Abstract
The Sushui complex is one of the main component parts of basement rocks in southern North China Craton(NCC). It is typically exposed in Zhongtiaoshan area and has been studied in detail. The Early Precambrian metamorphic basement complex rocks sporadically exposed in Shanxi-Shaanxi border area are traditionally regarded as the western extension and equivalents of Sushui com-plex in Zhongtiao region. LA-ICP-MS zircon U-Pb dating reveals that the protolithic ages of amphibolite-plagioclase gneiss, diop-side-plagioclase gneiss and two-feldspar granite gneiss are 2260±28Ma, 2053±34Ma and 2098±27Ma, respectively, significantly younger than the ages of rocks in Zhongtiaoshan area, suggesting that the Sushui complex was likely formed in Early Paleoproterozo-ic rather than in Archean. The majority of zircons of the samples have negative εHf(t) values (the lowerest being -6) with two-stage crustal model ages of 2630~2933Ma, which suggests that these samples were derived from recycled Mesoarchean to Neoarchean crust, and continental crustal materials as old as 2630~2933Ma probably preexisted in the Shanxi-Shaanxi border area. These results provide further evidence for the inference that the southern NCC was likely a coherent ancient terrane at the end of the Neoarchean.关键词
华北克拉通/涑水杂岩/基底岩石/LA-ICP-MS锆石U-Pb年龄/Hf同位素Key words
North China Craton/Sushui complex/basement rocks/LA-ICP-MS zircon U-Pb ages/Hf isotope分类
天文与地球科学引用本文复制引用
王建其,刘祥,第五春荣..晋陕交界涑水杂岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成及其地质意义[J].地质通报,2017,36(2):392-401,10.基金项目
国家自然科学基金项目《国家创新研究群体: 大陆构造与动力学》(批准号:41421002)、《华北克拉通南缘早前寒武纪构造-热事件及其地质意义》(批准号:41672188)、《华北克拉通南缘豫陕地区古元古代构造-热事件研究》(批准号:41272004) （批准号:41421002）
