Optical dating of granite stone surfaces
Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as porphyritic.
Stimulating these mineral grains using either light (blue or green for OSL; infrared for IRSL) or heat (for TL) causes a luminescence signal to be emitted as the stored unstable electron energy is released, the intensity of which varies depending on the amount of radiation absorbed during burial and specific properties of the mineral.The deterioration of natural stone monuments is subject to different external reasons that take place through different weathering factors, in addition to other several factors concerning the stone itself “internal reasons” mainly pore structure and permeability index.All of these factors lead to the formation of altered surface layers, then damaging the original stone components.These slowly decay over time and the ionizing radiation they produce is absorbed by mineral grains in the sediments such as quartz and potassium feldspar.The radiation causes charge to remain within the grains in structurally unstable "electron traps"."Optical dating" typically refers to OSL and IRSL, but not TL.
All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.
Moreover EDX and XRD techniques were used for defining the chemical and mineralogical compositions of collected samples.
Lastly, Arc GIS program was used as a tool for simulation description of red weathering symptom to evaluate their aggressive roles in the deterioration processes affecting the object.
) is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.
Granites can be predominantly white, pink, or gray in color, depending on their mineralogy.
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