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Morphological analysis of micropyrite populations from the Toarcian of Bulgaria

Morphological analysis of micropyrite populations of argillaceous inner shelf deposits from the Toarcian of Bulgaria was carried out in order to evaluate their stratigraphic distribution and their potential as recorders for redox conditions. Four types of micropyrites were documented: 1) euxinic framboids; 2) oxic/dysoxic framboids; 3) polyframboids; and 4) non-framboidal diagenetic pyrites. Resedimented sulphides were also observed. Micropyrite morphologies denoted upper- to lower dysoxic depositional settings within the sampled successions. Anoxic conditions seem also possible to exist but at very narrow intervals.