The geological record of the southwestern margin of the Yangtze block plays an important role in under standing the amalgamation and breakup of the Columbia super continent. However, the tectonomagmatic evolution of the late Paleoproterozoic remains controversial. In this study, we document Paleoproterozoic regenerated granite from the Lufeng area in central Yunnan Province, located at the southwestern margin of the Yangtze block. This granite formed through the rapid sedimentation of weathered K- feldspar granites within the Paleoproterozoic Lüzhijiang Formation and is mainly composed ofquartz and potassium feldspar, with minor biotite and plagioclase. LA- ICP- MS zircon U- Pb dating, zircon Lu- Hf isotopeanalysis, whole- rock geochemistry, and zircon trace element data reveal the following key findings: The weighted mean 206Pb/207Pb age of zircons is 1849 ± 6 Ma (MSWD=0. 11, n=21). The εHf(t) values of 7 zircons range from 7. 23±0. 7 to 3. 58±0. 75, with an average of 5. 2±1. 2, and the TDM2 model age is 2819±73 Ma. Zircon trace element signatures and whole- rock geochemical features indicate that the protolith was an S- type granite, possibly derived from the partial melting of Mesoarchean metasedimentary rocks. The discovery of Paleoproterozoic regenerated granites confirms the existence of ~1. 85 Ga S- type granites at the southwestern margin of the Yangtze block, as well as evidence for rapid weathering. These findings provide new insights into the Columbia supercontinent cycle and its linkage to Earth' s surface environments. Additionally, they establish that the Lüzhijiang Formation in central Yunnan Province was deposited during the Paleoproterozoic, shedding new light on the Precambrian geological studies.