摘要
///Cathodoluminescence and LA-ICP-MS analysis were conducted on zircon grains from three basic volcanic rock localities of the Erlangping Group, namely, in Junmahe, Wantan and Tuanhe-Tuanyuan regions, eastern Qinling Mountains. CL investigations show that the zircon grains from the three areas have the same behavior of euhedral to subhedral prismatic shape with weak, broad oscillatory zoning internal structure. Trace element analyses revealed a typical magmatic zircon origin. LA-ICP-MS zircon dating yield crystallization ages of (463±1.8) Ma,(475±1.5) Ma and(473±1.3) Ma for basic volcanic rocks from Junmahe, Wantan and Tuanhe-Tuanyuan sections, respectively. Together with their distinct geochemical affinities, Erlangping volcanics are of back-arc basinbasalt and the protolith of the UHP eclogite is of within plate basalt. Therefore, the UHP eclogite in the North Qinling Mountains has no direct relationship with the basic volcanics in the Erlangping Group.