9:15 AM - 9:30 AM
[HGM14-02] An experimental study on salt weathering in cold and dry climate
Keywords:salt weathering, humidity change, tafoni, Antarctica, Mars
Fine materials with the size of < 2 mm were splitted off from the surface of specimens with salts. The weight reduction of the specimen was largest for the case using NaCl. The decrease in Equo-tip hardness value of specimens with NaCl indicated the reduction of the surface strength. The longitudinal wave velocity of all specimens did not change. Therefore, salt weathering only occurred on the rock surface. The temperature on all specimens increased immediately after humidity increased, and the degree of temperature change was larger for the specimens with NaCl which deliquesces in air with high humidity. These temperature changes might be induced by salt dissolution and deliquescence with water condensation.