Experimental data on the dissolution of silica from feldspar at various pH values is available (e.g. Wollast [1]), we wished to model the dissolution rate as a summary succession discrete event simulation so that all of the dissolution events over a time interval were modelled. Wollast recorded data over a period of 25 days; modelling each event in this time period is therefore a computationall...

Geochemical characteristics of greywacke and intercalated phyllites from Haveri and Dharwad block (long N 75° 10' to 75° 25' E and lat 15° 30' to 45° 00'S and (long 75° 05'E and lat S 15° 15' to 15° 35') of Shimoga basin have been studied to unravel the provenance and the tectonic setting of the greywackes. The greywackes are medium grained feldspatholithic and show presence of perthitic feldsp...

A method IS presented for determmmg the dlstnbuhon of reaction products and the stolcluometnc coefficient for the reachon of mud acrd (HF/HCl) with various mmerals To Illustrate the techniques, the drssolutmn of two common ahmuno-slllcates. potassmm feldspar and kaohmte, m mud acid IS mveswated for various temperatures and acid concentrations After determmmg the product dlstibuhon from the ~omc...

In the search for aqueous habitats on Mars direct proof of (ancient) flowing water is still lacking, although remote sensing has provided indications of young fluvial systems. To demonstrate that such proof can be given, we examined surface marks on recent terrestrial sand grains by atomic force microscopy (AFM) and applied a quantitative three-dimensional analysis that can numerically distingu...