Abstract
A study of the main geochemical characteristics of the Pavin crater lake was performed in September 1992. Associated with previous results on the hydrochemical budget of the lake, the present study points out that: 1. (1) in the mixolimnion, the major reactions are photosynthesis, removal of silica by diatoms, iron oxidation and alkali and alkaline-earth incorporation in a solid phase; 2. (2) the major reduction reactions occur within the sediment and the products of the reaction are brought to the lake by diffusion; 3. (3) some reactions: silica dissolution, manganese oxide reduction, sulfate-sulfide transformations, iron and phosphate precipitation occur within the monimolimnion. 4. A complete budget of transfers and chemical reactions is presented for some components such as silica.
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