There has not been an agreement reached for a long time on the occurrence

host rocks and genesis of primary diamond deposits beneath the Yangtze Craton

China. In this paper

the surface features and FTIR of 199 macro diamonds from lamproite rocks and 16 diamonds from the surrounding river basins in Zhenyuan collected by No.101 Guizhou Geological Brigade were studied by non-destructive techniques including FTIR spectroscopic techniques

aiming at finding out valuable geological prospecting information/indication. The results showed that most primary diamonds are small in size and fragmentized

and are characterized by strong dissolution features or attaching materials on surface.  Most diamonds display blue-white fluorescence other than phosphorescence. FTIR results confirmed the majority of the diamonds are type IIa

but their proportion is less than previous estimation and observation. Compared with Hunan and Guizhou placer diamonds

it is believed that the host lamproite rocks of the primary diamonds in Zhenyuan is not the primary source of those placer diamonds discovered in Guizhou and Hunan provinces. Based on field survey and research of the geological occurrence

it is concluded that lamporite rocks in Zhenyuan may be shallow phase rather than deep root phase

implying it has the potential to discover new primary diamond deposits in Guizhou.