LI Hai-lan1,2,3, FAN Hong-peng2, ZHANG Jie1*, ZHANG Yu-song1, HUANG Zhi-long2*
(1. College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China;
2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
3. Panzhihua University, Panzhihua 617000, China)
Abstract: Bauxite deposits (occurrences) are widely distributed in the Wuchuan-Zhengan-Daozhen area in the Northern Guizhou. Their ore-bearing rock series contain various kinds of associated critical metal elements with relatively high comprehensive utilization value. The Danping bauxite deposit is a large-scale one discovered in the Xinmo Syncline in recent years. In this paper, based on the study of geological characteristics and mineral assemblages of typical ore-bearing rock series in the Danping deposit, the contents of major, trace and rare earth elements in various types of ores and bauxite-bearing rocks in different locations have been determined, and the distribution characteristics and enrichment regularity of associated elements of the deposit have preliminarily been found out. The results show that many critical metal elements are enriched in different degrees in the bauxite-bearing rock series of the deposit., There are obvious variances in terms of the types of enriched elements and degrees of elemental enrichment in bauxite-bearing rocks of different locations and different types of bauxite ores. This is closely related to the assemblages and contents of minerals in the bauxite mineralization process. Generally, Li, Sc and Ga in bauxite deposits in this area have relatively great potential value for the comprehensive utilization. Especially, Li is significantly concentrated in the middle-upper layers of the ore-bearing rock series, while Sc and Ga are enriched in the middle-lower layers of the ore-bearing rock series. In addition, the sandy shale of the Lower Silurian Hanjiadian Formation underlying the ore-bearing rock series had experienced relatively weak desilication, but weak aluminum and iron enrichment. Many trace elements, such as REE, are also enriched in various degrees in the sandy shale of the Hanjiadian Formation but their enrichment mechanisms remain to be further studied.
Keywords: Danping bauxite deposit; Ore-bearing rock series; Associated elements; Enrichment regularity; Northern Guizhou
ACTA MINERALOGICA SINICA Vol. 41, No.4/5, 2021, page 427-438