WANG Tian-shun1,2, FU Yong1,2*, HE Wei3*, LONG Zhen1,2, LIU Yang1,2, LONG Ke-shu1,2
(1. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China;
2. Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guiyang 550025, China;
3. Southwest Energy Mining Group Co., Ltd, Guiyang 550004, China)
Abstract: Geological records of In-situ trace elements contents and isotopic compositions of clastic zircons are effective means to determine provenance of sediments. Bauxite deposits in China are widely distributed and occurred in various strata. In this paper, we have summarized the age spectra of clastic zircons in the main bauxite metallogenic areas in China, constrained their material sources, and simulated their sedimentary processes by combining their paleoenvironments and lithofacies palaeogeographic characteristics. It is considered that the zircons of bauxite deposits in the North China Block were mainly sourced from the magmatic rocks formed during the early Silurian and late Carboniferous in the structural units on the north and south sides of the North China Block. After the weathering and denudation of these magmatic bodies, zircons and weathering materials were transported directly from the source areas to the sedimentary basins for deposition; The zircons of bauxite deposits from the northern Guizhou -- southern Chongqing and central Guizhou bauxite metallogenic areas could be mainly sourced from Neoproterozoic magmatic bodies on the western and eastern margins of the Yangtze Block. Especially, materials of the northern Guizhou -- southern Chongqing bauxite metallogenic area could be directly sourced from the central Guizhou and Xuefeng uplifts in the southern part of the South China Block, whereas materials of the central Guizhou bauxite metallogenic area could be mainly sourced from the Kangdian ancient land in the western part of the Yangtze Block; The zircons in bauxite deposits of the southeastern Yunnan -- western Guangxi metallogenic area could be mainly provided by magmatic rocks associated with the northwestward and southwestward simultaneous tectonic movements in the bauxite metallogenic area, and their ore-forming materials could also be transported directly from the zircon source area to the sedimentary basin for sedimentation.
Keywords: Zircon U-Pb chronology; bauxite deposit; material source; Hf isotope; lithofacies palaeogeography
ACTA MINERALOGICA SINICA Vol. 41, No.4/5, 2021, page 558-569