Iron mineralogy in sediments. A Mössbauer study

Archaeomagnetic Dating and Palaeochannels Sediments: Data From the Mediaeval Channel Fills at Hemington, Leicestershire

“…A phenomenon often noted in lake sediments is a loss in the intensity of NRM and magnetic susceptibility. This is thought to be due to the oxidation of labile greigite and biological oxidation of pyrite (Hilton et al, 1986;Hilton, 1990;Snowball & Thompson, 1990;Crockford & Willet, 1995). On air drying there was dramatic loss of intensity of NRM and volume susceptibility in both units 3 and 4 and a dramatic change in remanence direction (Table 6).…”

Dissimilatory Fe(III) and Mn(IV) reduction.

“…The Fe(II) that remains in solid forms is not well characterized (153,323) and may be in the form of various Fe(II) minerals such as vivianite (30,71,95,131,265), siderite (30, LOVLEY 129, 265, 326), hydroxides (323), mixed Fe(II)-Fe(III) compounds (182,193,261,264,323), and Fe(II) silicates (30, 122, 261) as well as amorphous Fe(II) adsorbed onto various solid phases, including clays and organic matter (134,306,323). Iron sulfides can be important sinks of Fe(II) in marine environments and may also be important in freshwater environments such as swamps, which are unusually rich in organic compounds and have substantial releases of sulfur from organic matter (29).…”

Iron speciation in bleached rocks by hydrocarbon leaching in Dushanzi Mud Volcano, NW China

“…As one of few available methods, Mössbauer Effect offers a potential for obtaining information about the proportion of ferrous and ferric iron species in both crystalline and amorphous materials and has been applied in a wide range of scientific fields, including the iron chemistry of sediments (Manning. and Ash, 1979;Mørup et al, 1985;Hilton et al, 1986;Zheng et al, 2001). In this paper, iron species of bleached rock samples collected from the Dushanzi mud volcano were investigated for their iron speciation in order to understand the bleaching effect on the reddish sedimentary beds by released hydrocarbons in an inland basin under a very arid climate.…”