Abstract: The highly depleted basalts-diabases with N-MORB features have been found in the Mesoproterozoic Lenjiaxi strata from Nanqiao, Liuyang, Hunan province. K20 in the basahs are very low. The basahs and diabases show highly depleted geochemical features. Abundances of their incompatible HFSE, such as Nb, Zr, Hf, Ti , and REE are lower than （ some are close to） those of N-MORB. Their εNd（ 1271 Ma） varies from 6.86 to 8.98. These basalts distributed along an ancient subducting zone provide a new evidence for ancient Jiuling island arc. The Neoproterozoic basalts and diabases from Qianyang and Guzhang, western Hunan, are classified as alkaline basahs. Their geochemical features of trace elements are similar to those of OIB. Their scale of distribution in the field should be further examined. The mafic-ultramafic rocks in Danzhou group from northern Guangxi have lower TiO2, Ta and Nb, and lower Hf/Th, Ti / Y and Ti / Zr ratios and higher La/Ta and Th / Yb ratios, Showing arc affinities. They did not show any CFB and OIB signatures. In tectonic discrimination diagrams, they are plotted in the field of “volcanic arc basahs”. Some samples are within “back-arc basalts” field. Both high-Mg lavas with high temperature features and giant radiating dyke swarms have never been found so far in the area. The exposed area of these mafic rocks in the field is very small （ about 100 km^2 ） without the characters of the plume-derived mafic magmas. The features of Neoproterozoic peraluminous S-type granites from northeastern Hunan and northern Guangxi provinces are similar to those of the Jiuling granites in Jinagxi province, and the Xiuning, Xucun and Shexian granites in Anhui province. They are distributed along the Jiangnan orogenic belt with zonal features. The generation of the S-type granites are related with the continent-continent collisional event between the Yangtze and Cathaysia blocks. Most S-type granites occur in the orogenic belts with various ages in the world. In the mafic large igneous province formed by plume magmatism, the granites associated with continental flood basalts are non-orogenic, intraplate and A-type granites rather than S-type. S-type granites should not be considered as the evidence of plume magmatism. It is suggested that the confirmation of “Jiangnan orogenic belt” has been supported by full petrological evidences.