Recent geological survey has identified the Early Paleoproterozoic meta-mafic intrusions in the southwest Yangtze Block.We present geochronological,whole-rock geochemical and Nd iso-topic data for these meta-mafic rocks to better address the tectonic evolution of the Yangtze Block dur-ing the Early Paleoproterozoic Period.Geochronological data show that the meta-mafic rocks have zir-con ages of 2 395-2 316 Ma.They have high TiO2 contents of 1.40 wt.％-3.66 wt.％and Nb concentra-tions of 13.7 ppm-45.5 ppm,thus aregrouped as Nb-enriched mafic rocks.These mafic rocks are cha-racterized by tholeiitic compositions with enrichment of LREEs and LILEs,and can be divided into two groups.Group 1 samples display E-MORB-like geochemical characteristics.Group 2 samples have positive εNb(t)values of 4.0-5.0.Geochemical data indicate that all meta-mafic rocks were likely derived from a depleted asthenospheric mantle.REE modeling indicates lower degree of partial melting for Group 2 samples(3％-10％)relative to Group 1 samples(15％-20％).Taking into account contempo-raneous post-collisional granitoids in southwest Yangtze Block,we propose that these meta-mafic rocks were formed in a post-collisional extension setting.These meta-mafic rocks can be compared with those in Africa,South America and Europe,and might be linked with the Arrowsmith orogenic belt.