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GeoRef Categories
Era and Period
Epoch and Age
Book Series
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Availability
iron minerals
Evidence for abundant organic matter in a Neoarchean banded iron formation
Environmental, Biomedical, and Industrial Applications of Biogenic Magnetite Nanoparticles
Nuclear magnetic resonance at the laboratory and field scale as a tool for detecting redox fronts in aquifers
Transformation of Fe-bearing minerals from Dongsheng sandstone-type uranium deposit, Ordos Basin, north-central China: Implications for ore genesis
Preliminary Evaluation of Natural Antibacterial Clays for Treating Wound Infections
Iron and sulfur speciation and cycling in the sediments of marine systems located in arid environments: the northern Red Sea
A quantification of the effect of diagenesis on the paleoredox record in mid-Proterozoic sedimentary rocks
Attraction in the Dark: The Magnetism of Speleothems
Mössbauer Spectroscopic Study of Phosphatic Sediments Collected from Fatehgarh Formation of Northern Barmer Basin, Western Rajasthan
Iron Mineralogy and Magnetic Susceptibility of Soils Developed on Various Rocks in Western Iran
A mineralogical archive of the biogeochemical sulfur cycle preserved in the subsurface of the Río Tinto system
Abstract: The occurrence and distribution of minerals in modern sedimentary systems hold many clues to help unravel the origin and distribution of reservoir quality-controlling minerals in ancient and deeply buried sandstones, but few quantitative studies have been undertaken. Here we have used a range of techniques including X-ray diffraction, scanning electron microscopy and fully automated mineralogical QEMSCAN analysis to provide a comprehensive understanding of mineral composition and distribution within the post-glacial, clastic sediments of the Ravenglass Estuary, NW England. The Ravenglass Estuary is fed by two main rivers: one drains a granite-dominated hinterland, the other drains a hinterland that contains andesite and Triassic red bed sandstones. The granite-supplied arm has slightly more quartz-rich and Fe mineral-poor sediment than the andesite- and red bed-supplied sediment. The provenance signals are muted for feldspar and mica minerals heavy-mineral garnet populations seem to be sensitive to provenance. Detrital K-feldspar grains are preferentially associated with illite-dominated clay mineral coats, whereas all plagioclase mineral grains are preferentially associated with kaolinite-dominated clay mineral coats. This can be explained by rapid early diagenesis in the sediment with K-feldspar grain surfaces replaced by illite and plagioclase grain surfaces replaced by kaolinite. The andesite- and red bed-supplied sediment contains twice the amount of Fe minerals, which are dominated by chlorite, than the granite-supplied sediment. Chlorite rarely is associated with grain coatings on feldspar grains, possibly because it is predominantly a detrital mineral. Detrital Fe minerals seem to be locally replaced by pyrite due to bacterial sulphate reduction, suggesting that some early diagenetic processes may serve to lock away iron and prevent it from creating Fe-rich clay minerals.
Abstract This volume is intended to provide a useful reference source and a picture of the present status of the chemistry, geochemistry and mineralogy of redox-reactive materials. Although in this volume some progress has been made in this direction, the aim is by no means achieved, especially with this extremely broad, diverse and vibrant area of research.
Iron meteorites and their weathering products: high velocity resolution Mössbauer spectroscopy of the iron-bearing minerals
Chemical and mineralogical studies of the red chromatic alteration of Florentine Pietra Serena sandstone
Iron Oxides Mapping from E0-1 Hyperion Data
Characterizing mineralogy and redox reactivity in potential host rocks for a UK geological disposal facility
Formation of iron minerals on zeolite matrix
Hematite replacement of iron-bearing precursor sediments in the 3.46-b.y.-old Marble Bar Chert, Pilbara craton, Australia
The upside-down biosphere: “Evidence for the partially oxygenated oceans during the Archean Eon”
This is a commentary on the preceding chapter by Ohmoto et al., in which it is suggested that oxygen concentrations have been high throughout Earth history. This is a contentious suggestion at odds with the prevailing view in the field, which contends that atmospheric oxygen concentrations rose from trace levels to a few percent of modern-day levels around 2.5 b.y. ago. This comment notes that many of the data sets cited by Ohmoto et al. as evidence for a relatively oxidized environment come from deep-ocean settings. This presents a possibility to reconcile some of these data and suggestions with the overwhelming evidence for an atmosphere free of oxygen at that time. Specifically, it is possible that deep-ocean waters were relatively oxidized with respect to certain redox pairs. These deep-ocean waters would have been more oxidized than surface waters, thus representing an “upside-down biosphere,” as originally proposed 25 years ago by Jim Walker.