2.5～2.7 Ga Tectono-thermal Events in Western Shandong:Geology and Zircon SHRIMP Dating of TTG Rocks in Huangqian Reservoir, Taishan Mountain
Western Shandong is an important exposure of Archean basement in the North China Craton,with a long-term continuous geological record from early Neoarchean to late Neoarchean.We conducted detailed field observation and zircon SHRIMP U-Pb dating on magmatic rocks of different types and ages,which show clear contact relationships.The early gneissic tonalite,which belongs to the Wangfushan Complex,shows an anatexis feature and has magmatic and metamorphic zircons of 2695 ±7Ma and 2630 ± 10Ma,respectively.It was cut by trondhjemite veins,which have magmatic and xenocrystal zircons of 2626 ± 8Ma and 2689 ± 12Ma,respectively.Both of them were intruded by late tonalite (Xianyu intrusive body) of 2547 ±7Ma,with 2.6 ～2.7Ga xenocrystal zircons.The formation of the magmatic rocks of different ages is considered to be a miniature of Neoarchean geological evolution in western Shandong.
国家科技期刊平台
NSTL
万方数据
维普
