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Fracture controls on valley persistence: the Cairngorm Granite pluton, Scotland

“…13). Linear zones of altered and fractured rock have also been reported from shield (Alvarez and Dunlop 1998;Airo 2002) and platform (Flinn 1977;Imber et al 1997;Franklin 2013) areas, indicating that structures equivalent to LAZs may be fundamental controls on valley location and orientation in many crystalline terrains.…”

Utilization of Image, LiDAR and Gamma-Ray Information to Improve Environmental Sustainability of Cut-to-Length Wood Harvesting Operations in Peatlands: A Management Systems Perspective

“…These soil mapping flights have been carried out systematically since the beginning of the 1970s at a flight height of between 30 and 50 m and a flight line distance of 200 m. These elements of natural gamma radiation materials were interpolated on a 50 × 50 m raster [61]. Both airborne and terrestrial tools can be used to measure the radiation in mineral soils to take advantage of the thickness of the peat layer and to identify wetland areas because the flux of gamma-ray radiation, particularly from potassium and thorium, decreases when the soil moisture content increases [62][63][64][65]. The water content of peat is, on average, 90%.…”

“…The water content of peat is, on average, 90%. That is why it is impossible to detect gamma rays in peatlands with natural humidity levels if the peat layer thickness is more than 0.6 m [63]. This relationship has been used to provide wet and site index estimations of peatlands.…”

Application of Airborne Geophysical and ASTER Data for Hydrothermal Alteration Mapping in the Sar-Kuh Porphyry Copper Area, Kerman Province, Iran

“…Hydrothermal alteration minerals contain 40 K, which is associated with K during the hydrothermal processes, and is therefore an important component of fluids. Therefore, hydrothermal alteration minerals (sericite, biotite, K-feldspars and many K-bearing clay minerals) can be detected and mapped by using radiometric data [10]- [12]. Elevated potassium in the sericite zone is often observed around the mineralization areas and also acid sulfate conditions resulting from weathering of near surface sulfides can result in eTh mobilization from host rocks and can precipitate with iron in gossan [13].…”

“…Elevated potassium in the sericite zone is often observed around the mineralization areas and also acid sulfate conditions resulting from weathering of near surface sulfides can result in eTh mobilization from host rocks and can precipitate with iron in gossan [13]. Several workers have reported a decrease in magnetization and changes in 40 K and the 40 K/eTh ratio associated with hydrothermally altered zones [12], [14]. In addition, the application of gamma-ray spectrometry for the recognition of potassic alteration by using the eTh/ 40 K ratio was reported [15].…”