沉积学报2025，Vol.43Issue(2)：481-499,19.DOI:10.14027/j.issn.1000-0550.2024.066
鄂尔多斯盆地神木—米脂地区本溪组含铝岩系中锂的富集机理研究
Mechanism of Lithium Enrichment in Bauxite Deposits of the Benxi Formation in Shenmu-Mizhi Area,Ordos Basin
摘要
Abstract
[Objective]Lithium constitutes a critical strategic and new energy metal within China.The Ordos Basin features a widespread distribution of bauxite deposits.Recent years have seen a major breakthrough in bauxite gas ex-ploration within the Longdong area of the Ordos Basin.Exploration has uncovered considerable reserves of Li resourc-es associated with the bauxite deposits.Consideration of the occurrence and enrichment patterns of Li in bauxite de-posits has significant academic value for studying paleoclimate and paleoenvironments,and also offers robust support for the exploration and development of Li resources.[Methods]Focusing on the Al-bearing rock series of the Benxi Formation in the central and eastern Ordos Basin,this study builds upon classical understandings and recent re-search advancements to investigate the fundamental characteristics,modes of occurrence and enrichment patterns of Li,employing core observation,drilling data and geochemical testing.[Results]The findings reveal that Li is un-evenly distributed in the bauxite deposits,with a substantial range of variation.Generally,Li is most highly concen-trated in the middle and upper segments of the deposits.It is predominantly concentrated in bauxite clay rock and bauxite rock,but is comparatively rare in bauxite iron ore.Initially,Li is positively correlated with Al2O3,SiO2 and the Al2O3/SiO2 ratio,which subsequently transitions to a negative correlation.[Conclusions]The hot,humid and high rainfall conditions of the paleoclimate together with an alkaline environment facilitated the formation of clay minerals and enhanced the isomorphic substitution of Li+for Al3+and Mg2+,but as desilication and aluminum enrich-ment intensify the Li content of bauxite rock sharply decreases,attributable to the lack of clay minerals.关键词
鄂尔多斯盆地/含铝岩系/锂/赋存方式/富集规律Key words
Ordos Basin/bauxite deposits/lithium/occurrence state/enrichment mechanism分类
天文与地球科学引用本文复制引用
潘博,余瑜,赵伟波,周星泽,王怀厂,张辉,史云鹤,陈宇航,姚亦芸,郭睿良..鄂尔多斯盆地神木—米脂地区本溪组含铝岩系中锂的富集机理研究[J].沉积学报,2025,43(2):481-499,19.基金项目
中国石油长庆油田分公司勘探事业部技术研发项目(2022-40)[The Project of PetroChina Changqing Oilfield Company,Dis-tribution characteristics of bauxite deposits of Benxi Formation in Shenmu-Mizhi area,Ordos Basin,No.2022-40] （2022-40）
