Clay deposits are accumulations of fine-grained, clay-sized minerals (typically <2 μm) formed through chemical weathering, hydrothermal alteration, or sedimentary processes and concentrated in specific stratigraphic or geomorphic settings. They consist predominantly of phyllosilicate minerals such as kaolinite, illite, smectite, and mixed-layer clays, whose composition reflects source rock mineralogy, climate, pH, redox conditions, and diagenetic history. As research topics, clay deposits are studied for their provenance, paleoclimatic significance, mechanical and rheological behavior, sorption and ion-exchange properties, role in hydrocarbon systems, and as raw materials in ceramics, barriers for waste isolation, and environmental remediation.
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