Abstract. Epidote – here defined as minerals belonging to the epidote–clinozoisite solid solution is a low-? (?=238U/204Pb) mineral occurring in variety of geological environments and participating many metamorphic reactions that stable throughout wide range pressure–temperature conditions. Despite containing fair amounts U, its use U?Pb geochronometer has been hindered by commonly high content...

The formation of stable buoyant continental crust during the Archaean Eon was fundamental in establishing planet's geochemical reservoirs. However, processes that created Earth's first continents and timescales over which they formed are debated. Here, we report Pb isotope compositions K-feldspar grains from 52 Paleoarchaean to Neoarchaean granites Pilbara Craton Western Australia, one world's ...

The present study aims to assess Abu Rusheid and Um Naggat albite granite’s natural radioactivity in the Central Eastern Desert, Egypt, using an HPGe laboratory spectrometer. A total of 17 granite samples were detected for this study. activity concentrations estimated 238U (range from 204 1127 Bq/kg), 226Ra 215 1300 232Th (from 130 1424 Bq/kg) 40K 1108 2167 area. Furthermore 80 800 118 1017 58 ...

Background: The equivalent dose in the human body due to the natural gamma-emitting radionucides (238U, 232Th and 40K) in the surface soil surrounding the Consolidated Tin mine site in Bukuru-Jos, Nigeria has been determined in this study. Materials and Methods: Measurements of the soil natural radioactivity were made using a multi-channel pulseheight analyzer (Canberra Series 10 plus) coupled ...