桂西上二叠统合山组含铝岩系关键金属成矿规律及物质来源OA

Bauxite deposits are an important source of critical metals.This study focuses on the deposits within the Upper Permian Heshan Formation(P3h)in western Guangxi,a major bauxite-producing region in China.By analyzing the critical metals in this aluminum-bearing rock series,we aim to provide a framework for the comprehensive exploration,evaluation,and utilization of these resources.Based on the latest exploration results,this study:summarizes the planar distribution of associated critical metals across deposits;provides a detailed analysis of the aluminum-bearing rock series;investigates the vertical enrichment patterns of critical metals in the profile;and elucidates the sources of the metallogenic materials.The results demonstrate significant enrichment of critical metals(Ga,Li,Nb)and rare earth elements(REE)in the Heshan Formation.These critical metals are mainly enriched in two zones:the bauxite ore layers in the middle of the sequence and the ferruginous-aluminous rocks in the lower part.The aluminum-bearing rock series and the critical metals have a polygenetic origin.We propose a dual-source model where material was derived from both the underlying basement strata and from intermediate-to-felsic volcanic rocks derived from the Late Permian volcanic island arc.