Lead content of the pitchblende mineralization is high and with moderate volcanics (up to 7.71% Pb O).
Abu El Leil, “Structural Analysis as a Guide to Mineralization Trends in the North Eastern Desert of Egypt,” Annals of the Geological Survey of Egypt, Vol.
At a smaller beam size of 8 um, precision decreases to 15% for concentration above 1.7 μg g–1.
As the beam size is decreased to ∼5 μm, precision declines to about 15% and 20% for concentrations above 10 μg g Si as internal standard, respectively.
The EPMA data indicate that the crystals are Ce-monazite with a mostly homogeneous composition in light rare earth elements (LREE).Prices in € represent the retail prices valid in Germany (unless otherwise indicated). Prices do not include postage and handling if applicable. Allanite, which is a common accessory mineral in a wide variety of rock types, typically contains high concentrations of Th and U; thus, an in-situ method of U-Th-Pb dating of this phase would have broad application.We describe a method to permit Th-Pb ages of allanite to be determined with approximately ±10% accuracy using a high-resolution ion microprobe.*Prices in US$ apply to orders placed in the Americas only.Prices in GBP apply to orders placed in Great Britain only.