Study on the Geological Characteristics and Potassium Enrichment of the Middle Cambrian Potassium-containing Shale in Tongren,Guizhou Province
Potassium salt is an important strategic mineral resource for the production of potassium fertilizer in China.However,the soluble potassium mineral resources in China are very scarce,causing it difficult to meet the needs of national food security production.Luckily,the reserves of insoluble potassium mineral resources are abundant,especially the middle Cambrian potassium-containing shale widely developed in Tongren,Guizhou Province.In this study,we take this shale in Tongren as the research object,and focus on the geological characteristics,potassium occurrence,and enrichment rules.The results show that the potassium enriched layer mainly exists in the second section of the middle Cambrian Aoxi Formation(∈2a2),with the thickness of 26-36 m and the K2 O content of 7%-14%(avg.=9.59%).The main occurrence of potassium is microcline and illite.and the source of potassium-containing shale is likely derived from the weathering of the terrestrial felsic potassium feldspar.Potassium containing minerals(e.g.,microcline and illite)mainly precipitated at the slightly oxidized water bodies on the slop of the platform margin,and formed the potassium-containing shale.
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