Abstract

Bulk mineralogy, clay fraction mineralogy and layer ratio in interstratified illite-smectite were studied in three upper Miocene profiles, up to 200 m deep and representing very low sedimentation rates ( approximately 80 mm/10 3 yr) with environments of sedimentation ranging from hypersaline (gypsum deposits) to brackish. It is concluded that smectites and interstratified illite-smectites are stable in marine sediments until the elevated temperatures of deep diagenesis are reached.

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