Geochronological, geochemical and Sr-Nd-Hf isotopic constraints on the origin of the Late Mesozoic Intraplate magmatism in the Duofutun Area, West Qinling: Implications for asthenosphere-lithosphere interaction
- 作者：Xiao-Wei LiXuan-Xue MoXue-Hui Yu
- 会议时间：2012-09-21
- 作者单位：Xiao-Wei Li(School of Earth and Space Sciences, Peking University, Beijing, 100871, China ;State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China)Xuan-Xue Mo(State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China)Xue-Hui Yu(State Key Laboratory of Geological Processes and Min)
- 母体文献：2012年全国岩石学与地球动力学研讨会论文集
- 会议名称：2012年全国岩石学与地球动力学研讨会
- 会议地点：兰州
- 主办单位：中国地质学会
- 语种：chi
- 分类号：P5;P3
摘要
Early Cretaceous volcanism was confirmed in the Duofuntun Area,West Qinling.It has been dated at 105.83 ± 0.91 Ma (U-Pb Zircon) and 103 ± 2 Ma (whole rock matrix laser 40Ar/39Ar).The Duofuntun Volcanic Rocks (DVRs) are characterised by alkali basaltic and andesitic series.Mineral chemistry,major and trace element bulk-rock compositions suggest the DVRs underwent variable fractionation of olivine,clinopyroxene,plagioclase,Fe-Ti oxides,Cr-rich spinel and apatite.Chondrite-normalised rare earth element and primitive mantle-normalised trace element patterns of the DVRs remarkably resemble those of oceanic island basalts.