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An occurrence of lacustrine Mg-smectite in a pan of the southwestern Kalahari, Namibia

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The clay fraction ofthe deposits of the Otjomongwa Pan, southwestern Kalahari, is dominated by Mg-smectite. This mineral formed as an authigenic precipitate in a groundwater-fed lake, without involving the transformation of a precursor mineral. During the earliest recorded period, Mg-smectite formed together with sepiolite and dolomite in a shallow lake, This period was ended by a change in environmental conditions that led to an increase in the depth of the lake and a decrease in salinity and Mg content of the water. This resulted in a transition to a mineral association without sepiolite and including calcite, together with Mg-smectite and dolomite. The depth of the lake gradually decreased after this event, while the lake water progressively became depleted in Mg.
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Keywords: DOLOMITE; KALAHARI DESERT; LACUSTRINE SEDIMENTATION; NAMIBIA; SEPIOLITE; SMECTITE

Document Type: Research Article

Publication date: 2001-12-01

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