The Medves Region is a small landscape unit in North Hungary. Its rocks originated in the Tertiary era, among others Oligocene-Miocene sandstones are very typical. The erosional forms of these sandstones are peculiar, especially the sandstone
The Furnas Formation (Silurian to Devonian of the Paraná Basin) consists of medium to coarse sandstones cemented by kaolinite, which reduces its porosity and makes the rock more resistant. The findings indicate that the great features
Weathering experiments are reported combining frost and a range of salts that occur widely on sandstone rock outcrops in western and central Europe. The effects of alunogen, gypsum, halite and alum salts are examined, both singly and in combination
Salt distribution in clay-rich weathered sandstone
Clay mineral ; Geochemistry ; Oceanic climate ; Porosity ; Salt ; Sandstone ; Temperate zone ; Urban area ; Weathering
Analysis of two clay-rich sandstone blocks from a temperate maritime, urban environment indicates that, although structural changes such as scaling and flaking affect only the outer 10-20 mm of stone, the zone of alteration extends well beyond
variable sandstone, differences in porosity and/or clay mineral may result in different blocks being more susceptible to decay than other blocks.
A geostatistical investigation into changing permeability of sandstones during weathering simulations
Erosion rate ; Geostatistics ; Geotechnics ; Mid-latitude climate ; Model ; Northern Ireland ; Permeability ; Salt ; Sandstone ; Simulation ; United Kingdom ; Weathering
The aim of this research is to improve the understanding of the decay dynamics of masonry materials and sandstone by weathering and to provide a quantitative and predictive basis for conceptual models of sandstone decay using geostatistics. Data
Calcium loading of quartz sandstones during construction : implications for future decay
Atmospheric pollution ; Building materials ; Chemical erosion ; Gypsum ; Permeability ; Sandstone ; United Kingdom ; Weathering
Damage to quartz sandstones in polluted urban environments is frequently associated with the presence of calcium salts, especially gypsum. The aim of this study is to examine the possibility that non-calcareous quartz sandstones can be loaded
Age and hydrological significance of lichen limits on sandstone river channels near Sydney, Australia
Australia ; Drought ; Flood ; Hydrology ; Lichen ; Lichenometry ; New South Wales ; Plant colonization ; River regime ; Sandstone ; Stream
of flow regulation and climate change. They can also be used to set flushing flows in bedrock channels. In sandstone gorges of the Nepean River, Australia, the crustose lichen,Lecidea terrena Nyl, was common at both gorge and cemetery (sandstone headstones
) sites, enabling construction of growth curves for above and below dam areas. Growth curves were used to date lichen colonisation of sandstone surfaces in rivers. It is showed that lichens colonised exposed sandstone between the level of frequent flows
Contour scaling of a sandstone by salt weathering under simulated hot desert conditions
Surface disaggregation and essentially surface-parallel cracks were produced in sandstone blocks using 10 per cent solutions of sodium sulphate and magnesium sulphate applied daily to single exposed surfaces for sixty days. A control block soaked
The weathering rates of some sandstone cliffs, central Weald, England
Short-term (1-30 months) weathering rates were obtained for steep cliffs of Cretaceous Ardingly Sandstone in southern England, using a new photographic method. There was no correlation with grain size, porosity, or mean surface temperature. Highest
Comparative study ; Erosion ; Instrumentation ; Japan ; Kyushu ; Research technique ; Sandstone ; Weathering
Tafone-like depressions have developed on the Aoshima sandstone blocks used for a masonry bridge pier in the coastal spray zone. To evaluate quantitatively the strength of the thin weathered layer, the hardness was measured at the surface
of the sandstone blocks using both an Equotip hardness tester and an L-type Schmidt hammer. This article first describes the results, and secondly evaluates the usefulness of the device in quantifying the degree of rock weathering.
Rill systems on mudrock and sandstone in Alberta badlands were studied to examine progressive changes in material properties as smectic-rich mudrocks and sandstones undergo weathering, and the impact of seasonal changes in precipitation patterns
Processes and rate of retreat of the clay and sandstone sea cliffs of the northern Boulonnais (France)
Retreat of the clay and sandstone cliffs of the northern Boulonnais has been quantified using stereo photogrammetry. The low retreat rate of this coastal strip is far less than that encountered on chalk and clay-chalk cliffs of either side
Geomorfologicka analyza mereni dilata piskovcovych bloku v udoli Libechovky, Polomené hory. (Geomorphological analysis of sandstone block dilatations in the Libechovka valley, Polomené Hills))
Long term dilatations in vertical fissures between sandstone blocks are confronted with the geomorphological development of the rock relief in the low Libechovka valley between Tupadly and Zelizy in the Polomené Hills. The measurement diagrams