The emanating power of radon provides information on the internal structure of a mineral and the radiation damage caused by the decay of 238U, 235U and 232Th (and their daughters) that are present in the mineral. The concentration of 222Rn in groundwater is primarily controlled by the concentration of U and Th in the underlying rocks, as well as the emanation coefficient for that particular roc...

Recent thermochronologic data from the Annapurna region of central Nepal show very young ages in the footwall of the Main Central Thrust (MCT), with late Miocene-Pliocene Th/Pb monazite ages especially common 5-15 kilometers south of the MCT (Catlos et al., 2001). These data can be explained with several different models, including: 1) Reactivation of the MCT and its splays in Miocene-Pliocene ...

In the present study, the feasibility to use phosphate solubilizing bacteria (PSB) to develop a biological leaching process of rare earth elements (REE) from monazite-bearing ore was determined. To predict the REE leaching capacity of bacteria, the phosphate solubilizing abilities of 10 species of PSB were determined by halo zone formation on Reyes minimal agar media supplemented with bromo cre...

This paper investigates the monazite grains from Dibrova rare-earth-thorium-uranium (U-Th-REE) mineral deposit within Azov Megablock of Ukrainian Shield. U-Th-REE mineralization is associated with K-feldspar-quartz metasandstones and metagritstones (hereafter quartzites) pegmatoids. The latter possibly represent products ultrametamorphism/granitization initially sedimentary clastic rocks during...

Three different types of secondary coronas developed around monazite-(Ce) were discovered in altered metavolcanic rocks closely associated with the Palaeoproterozoic apatite-iron oxide ore deposit Grängesberg, Sweden. All three reaction include fluorapatite that is either rimmed by allanite-(Ce), REE-fluorocarbonate(s), or hingganite-(Y). The latter mineral has not been previously observed amon...

The discordance of U–Th–Pb isotopic systems in geochronometers, and how such data are interpreted, still major issues the geosciences. To better understand disturbance systems, this impacts derivation geologically-meaningful ages, previously studied discordant monazite from ultrahigh temperature paragneiss Archean Napier Complex (Antarctica) have been investigated. Monazite grains were characte...