Morfología de la pirita diagenética en sedimentos recientes del estuario del Río Odiel (SO de España)

Abstract

Diagenetic sulphurs have been observed in subsurficial sediments from Odiel River Estuary. These sulfurs display three distinct morphologies: microcrystal aggregates, framboidal aggregates and euhedral pyrite macrocrystals. The genesis of these pyrite morphologies occurs in non-strictly-anoxic environments with a continuous sulphate and iron support where the bacterial activity induces a fast nucléation and growth of microcrystals. These optimal environmental conditions present in the Odiel estuary allow an accelerated evolution from framboidal morphologies to euhedral macrocristals during early diagenetic stages