Monazite Dating

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PDF Monazite Age Dating - jeolusa .com
Monazite geochronology - Wikipedia
Microprobe Lab: monazite dating
U-Th-Pb dating of monazite by single-collector ICP-MS . . .
CHIME monazite dating: Pb analysis on an RR = 100 mm . . .
Monazite Dating of Prograde and Retrograde P-T-d paths in . . .
Electron Probe Microanalysis of Monazite and Its . . .
Authigenic monazite and detrital zircon dating from the . . .
Electron Microprobe (EMP) Dating on Monazite from . . .
Post-Variscan metamorphism in the Apuseni and Rodna . . .
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Monazite Age Dating . Introduction . Determining the age of a rock or rock unit (either relative or absolute) is one of the most fundamental tasks in geology . Because of this routine need, monazite age dating rapidly became a commonly used tool for those involved in field geology . Even though monazite typically occurs only as an
Monazite geochronology is a dating technique to study geological history using the mineral monazite .It is a powerful tool in studying the complex history of metamorphic rocks particularly, as well as igneous, sedimentary and hydrothermal rocks . The dating uses the radioactive processes in monazite as a clock .
Method Overview . Assumption: No non-radiogenic lead in monazite or at least very little . If you can precisely measure U, Th, and Pb (in ppm), you can solve this equation iteratively for lead to obtain an age . Map thin section with the microprobe . Ce, Fe, Y to find all monazite crystals . Map monazite grains . Th, Y, U to see chemical domains .
3 kohn and vervoort: u-th-pb dating of monazite 10 .1029/2007GC001899 2of16 . ±2-3% (2s) . Blank-corrected mean ratios were compared to the ID-TIMS-based values of stand-ards to derive a working correction factor, i .e ., the factor by which an apparent isotopic ratio must be
Monazite is a minor but ubiquitous heavy detrital mineral in clastic sediments . It contains sizable amounts of Th, U, and radiogenic Pb . The inter- and intra-grain age varia-tion of monazite , therefore, becomes a powerful measure of provenance analysis (Suzuki et al ., 1991) . Micron- sized domains in a monazite grain are hard to date with
Based on this combined approach we distinguish two populations of ages, the first dating the prograde P-T-d path close to peak metamorphic conditions in single metamorphic zones, and the second dating retrograde fluid-assisted recrystallization of prograde monazite . The relationships of the ages of tectonic processes leading to the . . .
Electron probe microanalysis (EPMA) dating of monazite has been developed over decades . However, limited by the detectability and analytical sensitivity of dating -related elements (Th, Pb, U and Y), the EPMA dating has been restricted to geological research . In this study, various probe currents, beam diameters and counting times have been utilized on a JEOL JXA-8230 electron microprobe to . . .
There, microprobe U-Th-Pb dating of monazite has demonstrated a metamorphic event at c . 1290 Ma in the Surprise Bay Formation (Berry et al ., 2005), while detrital zircon dating yields a maximum depositional age of 1450 Ma, or possibly 1350 Ma (Black et al ., 2004) . The lower-grade Fraser Formation is poorly constrained in age .
Electron microprobe (EMP) dating on monazite in granulite-facies rocks from Forefinger Point, East Antarctica, yielded dominant ages of ∼500 Ma on matrix monazites . They are associated with secondary cordierite, biotite and sapphirine, formed during nearly isothermal decompression after the high P-T assemblages involving garnet, orthopyroxene . . .
Monazite U-Pb dating of staurolite grade metamorphism in pelitic schists . Contributions to Mineralogy and Petrology, 105(5), 602-615 . Google Scholar Soroiu, M ., Balintoni, I ., & Vodă, A . (1985) . A model of the basement of the Transylvanian Basin as revealed by K-Ar dating . Revue Roumaine de . . .
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