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The mineralogy and origin of micas were investigated in incipient soils surrounding a modern alkaline-saline lake of Nhecolândia, a sub-region of Pantanal wetland. Soils were sampled along a toposequence and analyzed by XRD, TEM–EDS, and ICP-MS. The studied micas, mainly concentrated in a green horizon, are dioctahedral, strongly associated with Fe 3+ and Al, and interstratified with smectite...
Smectite formation in alkaline-saline environments has been attributed to direct precipitation from solution and/or transformation from precursor minerals, but these mechanisms are not universally agreed upon in the literature. The objective of this work was to investigate the mineralogy of smectites in the soils surrounding a representative alkaline-saline lake of Nhecolândia, a sub-region of the...
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