crystalline schist
1.Early Precambrian metamorphic crystalline basement With EW strike exposed in Yiyang-Liuyang,Hunan. Crystalline schist,layer and layer-like ultramafic rocks underwent amphibolite facies and greenschist facies. The Sm-Nd isochron ages of the ultramafic rocks are 2.6～3.028 Ga and (2.2)～1.9 Ga.
