Proton microprobe for chemical dating of monazite adult dating east rochester ohio
This study highlights the possibility to achieve suitable limits of detection, accuracy and precision for geological samples even at spatial resolutions of the order of 5 μm.
At a beam size of 15 μm, precision (measured as one sigma) and accuracy (expressed as relative deviation from the reference value) are of the order of 10%.
Accuracy is better or equal to 10% and 13% at beam sizes of 15 and 10 μm, respectively.
When the spatial resolution is increased to 8 μm, accuracy remains better than 15% and 20% for Si as internal standard, respectively.
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Hedge, “Lat Precambrian Rifting and Crustal Evolution in North Eastern Desert of Egypt,” Geology, Vol.
Clauer, “Age and Geochemistry of Lat Precambrian Sediments of Hammamt Series from the North Eastern Desert, Egypt,” Precambrian Research, Vol.
An isochron age of 347 ± 13Ma represents timing of amphibolite-facies metamorphism, in agreement with previously published estimates.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.The use of panchromatic and monochromatic CL images with CL spectra in combination with microanalytical techniques suggest that the luminescence of monazite is mostly due to four bands centered at 316, 339, 634, and 683 nm, partially overlapping and not clearly related to impurity activators or to microchemical differences.high-K Calc-alkaline plutons as Qattar granite may have been associated with their volcanic equivalent emplaced in the surrounding area or now eroded.