inscription

Portail d'information géographique

Résultats de la recherche (4 résultats)

New evidence of an organic contribution to manganese precipitation in iron-formation and review of sedimentary conditions in the Cuyuna North Range, Minnesota

The Cuyuna North Range was chosen as a study area because it has produced both iron ore and manganiferous iron ore from the Trommald Formation. Standard petrographic thin sections of this formation were studied for evidence of mechanisms involved
in the precipitation of manganese. The microstructures suggest that microbial precipitation may have been a dominant factor in the precipitation of both iron and manganese in the Trommald Formation.

Microbial oxidation of organic matter coupled to the reduction of Fe(III) and Mn(IV) oxides

This paper summarizes the results of investigations on microbially catalyzed Fe(III) and Mn(IV) reduction in both recent and ancient sedimentary environments.

Iron minerals in surface environments

This chapter provides a brief overview of the major Fe minerals occurring in earth surface environments where organisms are likely to participate in mineral formation. Microbiological activity is known to cause both the dissolution

Iron deposits and microorganisms in saline sulfidic soils with altered soil water regimes in South Australia

boreholes in the same area and ii) elucidate the biogeochemical processes of iron mineral formation in both the gelatinous red-brown iron-rich precipitates formed during the wet season and yellowish iron-rich crusts formed in the dry season.