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Geochemistry of the Yudong bauxite deposit, south-eastern Guizhou, China: Implications for conditions of formation and parental affinity
Jiafei Xiao;  Yantao Li;  Haiying Yang;   Jianbin Xu;   Mingliang Huang
2019
发表期刊Journal of Geochemical Exploration
卷号220页码:1-15
摘要

The Yudong bauxite deposit is located in the Kaili–Huangping bauxite-concentrated area, in south-eastern Guizhou Province, China. The ore-bearing rock series consists of the lower part (Fe-bearing member) and middle part (Al-bearing member) of the Middle Permian Liangshan Formation, covering the Upper Devonian Gaopochang Formation. The elemental content in the ore-bearing profile is variable. In general, Al, Ti, V, Cr, Zr, Nb, Hf, Th, and U increase from the Fe- to the Al-bearing member, whereas Si, Fe, Rb, Cs, Ba, and total rare earth elements (REE) decrease. These observations indicate the occurrence of bauxitisation, which corresponds to a process of elemental variation during which Si and Fe were dissolved and migrated, and Al was enriched. Compared with Ordovician–Silurian (O–S) mudrock, the ore-bearing rock series are enriched in Al, Ti, V, Zr, Hf, Nb, Ta, Th, and U, but depleted in Si, Fe, Rb, Cs, and Ba as a result of weathering. The REEs show negative correlations with Si, Fe, K, Na, Ca, Mg, and Y, indicating that the REEs may be associated with clay, Fe-bearing, and Y-bearing minerals.

The La/Y ratio, (La/Yb)N ratio, and Ce anomalies show that the Fe-bearing member formed in an alkaline reducing environment, whereas the Al-bearing member formed in an acidic oxic environment. The immobile element ratios, Eu anomalies, REE distribution patterns, and Cr–Ni diagram, as well as the comparison with worldwide bauxite deposits, show that the ore-bearing rock series may have originated in the O–S mudrock, with contributions from the dolomite of the Gaopochang Formation. Furthermore, the position of the samples in the Al2O3–Fe2O3–SiO2 ternary plot, the chemical index of alteration, and the strong positive correlations of some stable elements (such as Al, Ti, Zr, Hf, Nb, and Ta) indicates that the degree of weathering gradually increases from the O–S mudrock to the bauxitic mudrock, and further increases into the bauxite; the bauxitic mudrock and bauxite therefore originated from the O–S mudrock. The laterisation products of the O–S mudrock from the northern part of the ore collection area were transported to the karst depression in the early stages of the Middle Permian. The weathering products of the O–S mudrock and a small amount of the Gaopochang Formation dolomite accumulated on the karst interface, forming the original bauxite layers through cycles of compaction and concretion. These bauxite layers were then uplifted to or near the surface during the Late Cretaceous to Paleogene, eventually, forming karstic bauxite.

关键词Bauxite Geochemistry Formation Conditions Parental Affinity South-eastern Guizhou
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10814
专题矿床地球化学国家重点实验室
作者单位State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang 550081, China
推荐引用方式
GB/T 7714
Jiafei Xiao;Yantao Li;Haiying Yang; Jianbin Xu; Mingliang Huang. Geochemistry of the Yudong bauxite deposit, south-eastern Guizhou, China: Implications for conditions of formation and parental affinity[J]. Journal of Geochemical Exploration,2019,220:1-15.
APA Jiafei Xiao;Yantao Li;Haiying Yang; Jianbin Xu; Mingliang Huang.(2019).Geochemistry of the Yudong bauxite deposit, south-eastern Guizhou, China: Implications for conditions of formation and parental affinity.Journal of Geochemical Exploration,220,1-15.
MLA Jiafei Xiao;Yantao Li;Haiying Yang; Jianbin Xu; Mingliang Huang."Geochemistry of the Yudong bauxite deposit, south-eastern Guizhou, China: Implications for conditions of formation and parental affinity".Journal of Geochemical Exploration 220(2019):1-15.
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