Ore-Forming Ion Migration Regularity and Metallogenic Model of Nitrate Deposits in Kumishi Basin, Xinjiang [新疆库米什盆地硝酸盐类矿床成矿离子迁移规律及成矿模型]

摘要

In order to understand the spatial distribution characteristics of ore-forming ions and the reason for high nitrate content in surface sediments of nitrate deposits in Kumishi Basin. In this study it focuses on the nitrate deposits in the basin, and a quantitative analysis of the chemical composition of soluble salts in various make-up water samples and soil samples was carried out in the study area. Combined with field geological exploration work, the migration regularity of ore-forming ions in nitrate deposits is discussed. Besides, a model of sedimentary mineralization of nitrate deposits in the basin was established. The results show that ore-forming ions such as K+, Na+, and NO3- migrate and enrich from northwest and southeast toward the middle of the basin. The concentrations of K+, Na+, NO3- and other ore-forming ions gradually increase along the direction of the bedrock area?fan root?middle fan?fan margin in the diluvial fan in the northeast of the basin, and enrichment occurs in the surface sediments at the fan margin. In the vertical profiles, K+, Na+, NO3- and other ore-forming ions mainly show migration and enrichment in the depth range of 0-60 cm. Under the influence of capillarity, they migrated and enriched from deep to surface sediments.

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