Changes in the biomass and structure of soil microbial communities have the potential to impact ecosystems via interactions with plants and weathering minerals.
New and published 40Ar/39Ar geochronology of 346 grains of Mn oxides extracted from weathering profiles representing four regionally recognized landsurfaces in southeastern Brazil reveals that weathering minerals record minimum ages for the surfaces hosting the weathering profiles.
The observation that AM fungi actively weather minerals challenges the recent assumption that they are passive components of the Earth's biological weathering engine [ 16].
The common sources of Na+ in this region are weathering of minerals like feldspar and application of fertilizers.
The plotting of the chemical composition of the groundwater samples in Ca2+ + Mg2+:HCO3 −, Ca2+ + Mg2+:SO4 2− + HCO3 −, Na+ + K+ TC, Na+ + K+ Cl− + SO4 2−, HCO3 − TC, HCO3 −:Ca2+ + Mg2+, Na+ Cl− and Na+ Ca2+ diagrams suggests that the quality of groundwater is controlled by rock weathering, mineral dissolution, evaporation and ion exchange.
The ionic relations (Ca2+ + Mg2+:HCO3 −, Ca2+ + Mg2+:SO4 2− + HCO3 −, Na+ + K+ TC, Na+ + K+ Cl− + SO4 2−, HCO3 − TC, HCO3 −:Ca2+ + Mg2+, Na+ Cl− and Na+ Ca2+) indicate that the rock weathering, mineral dissolution, evaporation and ion exchange are the processes to control the aquifer chemistry.
The mineral is easily weathered to secondary lead minerals, the upper part of galena deposits often containing cerussite, anglesite, and pyromorphite.
Fungi can transform and weather the mineral surface of the stone by precipitating calcium carbonate into calcium oxalate by the actions of secreted oxalic acid using the process of secondary mineral formation (or neogenesis)[44, 47].
The groundwater quality in the study area is influenced by silicate-weathered minerals.
