Reduction–oxidation (redox) reactions occur during burial because sediments contain
reactive mixtures of oxidised and reduced components. Diagenetic chemical reactions …

Eleven reported laboratory syntheses of pyrite framboids are critically reviewed. Pyrite
framboids are defined as microscopic spheroidal to sub-spheroidal clusters of …

Pyrite framboids are densely packed, generally spherical aggregates of submicron-sized
pyrite crystals. In this study, a survey was made of framboid size distributions in recently …

Pyrite framboid formation may be the result of four consecutive processes:(1) nucleation and
growth of initial iron monosulfide microcrystals;(2) reaction of the microcrystals to greigite …

Acid‐volatile sulfide (AVS) and simultaneously extracted metals (SEM) are operationally
defined methods for the analysis of sulfide and associated metals in aquatic sediments. The …

An abrupt transition from oxic to anoxic–sulfidic (euxinic) marine bottom waters occurred in
the Cariaco Basin in response to increasing productivity resulting from the late Pleistocene …

Pyrite framboids have been synthesised as the product of the oxidation of FeS (mackinawite)
by H2S in aqueous solutions at pH 6, Eh>− 250 mV and temperatures above 60° C in the …

Trace metals commonly undergo chemical diagenesis in anoxic sediments from association
with metal oxides, organic matter, and other reactive components to coprecipitates with …

The reactions of Fe (II) and Fe (III) solutions with polysulfide solutions prepared from freshly
synthesized Na 2 S x (x= 2, 4, 5) were studied at 25 and 100° C over the pH range 5.5 to 8 …

Presents an integrated chemical behavior of selected toxic metals: arsenic, cadmium,
chromium, copper, mercury, and lead. All important processes that may affect their marine …