CHENG Yuqi Academicians and Luxi Precambrian Geological Research
The division of Yanlingguan group,Shancaoyu group and Liuhang group in Taishan formation has been determined by CHENG Yuqi academician.Residual amygdaloidl structure and rock flow characteristics have been found in amphibolite,and meta-basic lava flow,meta-volcanic tuffaceous rocks and meta-basic veins have been correctly distinguished.Bearing biotite plagioclase gneiss in original Huamawan group is banded tonalite gneiss in early Archean period.SHRIMP U-Pb zircon age of gneissic trondhjemite in anticline of Fushan mountain is(2612±20) Ma.Plagioclase amphibolites with vesicular filling structure belongs to Yanlingguan formation;while SHRIMP U-Pb age of the youngest fragements in gravel-bearing biotite leptynite in the core of Lijiazhuang inverted oblique in Liuhang group is(2524±7) Ma.