Laboratory simulation of salt weathering processes in arid environments

1979 ◽  
Vol 4 (4) ◽  
pp. 347-359 ◽  
Author(s):  
R. U. Cooke
Keyword(s):  
Laboratory Simulation ◽  
Salt Weathering ◽  
Arid Environments ◽  
Weathering Processes

The formation of silt from quartz dune sand by salt-weathering processes in deserts

1979 ◽  
Vol 2 (2) ◽  
pp. 105-112 ◽  
Author(s):  
A.S. Goudie ◽  
R.U. Cooke ◽  
J.C. Doornkamp
Keyword(s):  
Salt Weathering ◽  
Dune Sand ◽  
Weathering Processes

Laboratory simulation of the salt weathering of schist: II. Fragmentation of fine schist particles

2007 ◽  
Vol 32 (5) ◽  
pp. 687-697 ◽  
Author(s):  
Tony Wells ◽  
Garry Willgoose ◽  
Philip Binning
Keyword(s):  
Laboratory Simulation ◽  
Salt Weathering

scholarly journals The Role of Calcite Dissolution and Halite Thermal Expansion as Secondary Salt Weathering Mechanisms of Calcite-Bearing Rocks in Marine Environments

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 911
Author(s):  
Javier Martínez-Martínez ◽  
Anna Arizzi ◽  
David Benavente
Keyword(s):  
Thermal Expansion ◽  
Linear Thermal Expansion ◽  
Laboratory Simulation ◽  
Salt Weathering ◽  
Chemical Dissolution ◽  
Marine Environments ◽  
Thermal Cycles ◽  
Laboratory Simulations ◽  
Salt Crystallisation ◽  
Differential Thermal Expansion

This research focuses on the analysis of the influence of two secondary salt weathering processes on the durability of rocks exposed to marine environments: chemical dissolution of rock forming minerals and differential thermal expansion between halite and the hosting rock. These processes are scarcely treated in research compared to salt crystallisation. The methodology followed in this paper includes both in situ rock weathering monitoring and laboratory simulations. Four different calcite-bearing rocks (a marble, a microcrystalline limestone and two different calcarenites) were exposed during a year to a marine semiarid environment. Exposed samples show grain detachment, crystal edge corrosion, halite efflorescences and microfissuring. Crystal edge corrosion was also observed after the laboratory simulation during a brine immersion test. Calcite chemical dissolution causes a negligible porosity increase in all the studied rocks, but a significant modification of their pore size distribution. Laboratory simulations also demonstrate the deterioration of salt-saturated rocks during thermal cycles in climatic cabinet. Sharp differences between the linear thermal expansion of both a pure halite crystal and the different studied rocks justify the registered weight loss during the thermal cycles. The feedback between the chemical dissolution and differential thermal expansion, and the salt crystallisation of halite, contribute actively to the rock decay in marine environments.

Salt Weathering, a Neglected Geological Erosive Agent in Coastal and Arid Environments

Nature ◽  
1965 ◽  
Vol 205 (4976) ◽  
pp. 1097-1098 ◽  
Author(s):  
H. W. WELLMAN ◽  
A. T. WILSON
Keyword(s):  
Salt Weathering ◽  
Arid Environments

scholarly journals Weathering Processes and Mechanisms Caused by Capillary Waters and Pigeon Droppings on Porous Limestones

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 18
Author(s):  
David Benavente ◽  
Marli de Jongh ◽  
Juan Carlos Cañaveras
Keyword(s):  
Chemical Effect ◽  
Salt Weathering ◽  
Capillary Water ◽  
Material Loss ◽  
Weathering Processes ◽  
Geochemical Study ◽  
Pigeon Droppings ◽  
Deterioration Process ◽  
Dehydration Processes ◽  
Physical And Chemical

This investigation studies the physical and chemical effect of salt weathering on biocalcarenites and biocalcrudites in the Basilica of Our Lady of Succour (Aspe, Spain). Weathering patterns are the result of salty rising capillary water and water lixiviated from pigeon droppings. Surface modifications and features induced by material loss are observable in the monument. Formation of gypsum, hexahydrite, halite, aphthitalite and arcanite is associated with rising capillary water, and niter, hydroxyapatite, brushite, struvite, weddellite, oxammite and halite with pigeon droppings. Humberstonite is related to the interaction of both types of waters. Analysis of crystal shapes reveals different saturation degree conditions. Single salts show non-equilibrium shapes, implying higher crystallisation pressures. Single salts have undergone dissolution and/or dehydration processes enhancing the deterioration process, particularly in the presence of magnesium sulphate. Double salts (humberstonite) have crystals corresponding to near-equilibrium form, implying lower crystallisation pressures. This geochemical study suggests salts precipitate via incongruent reactions rather than congruent precipitation, where hexahydrite is the precursor and limiting reactant of humberstonite. Chemical dissolution of limestone is driven mainly by the presence of acidic water lixiviated from pigeon droppings and is a critical weathering process affecting the most valuable architectural elements present in the façades.

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