Monazite Dating Methods

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Monazite geochronology - Wikipedia
PDF Investigation of The Monazite Chemical Dating Technique
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Microprobe Lab: monazite dating
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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 .
monazite , we chemically analyzed selected suites of monazite grains that were previously dated by standard U/Pb isotopic methods at three laboratories each equipped with a sensitive high resolution ion microprobe (SHRIMP) . Representing diverse igneous and metamorphic lithologies, these grains yielded conventional isotopic ages ranging in age . . .
JEOL's MonaziteAge program follows the dating procedure outlined originally by Suzuki and Adachi (1991, 1994), and Suzuki and others (1994) . It can be used with both Th-rich phases and more U-rich phases, such as zircon or xenotime . It allows the user to calculate the age of a monazite grain from a single analytical point or from a set of analyses .
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
total Pb isochron method (CHIME) of monazite dating provide evidence for the granulite-facies metamorphism being 520-600 Ma (Cambrian) in age in these areas (Shiraishi et al . 1992, 1994, 1997a, 2003; Asami et al . 1996; Fraser et al . 2000), and consequently, the ∼1000-Ma ages could be dating protolith formation or an earlier high-grade
Using SIMS 206 Pb/ 238 U ages of monazite the Araguainha structure was dated at 254 .5 ± 3 .2 Ma (Tohver et al ., 2012) and 259 ± 5 Ma (Erickson et al ., 2017) . Concordant analyses of recrystallized zircon yield an age of 251 .5 ± 2 .9 Ma ( Hauser et al ., 2019 ), and 40 Ar/ 39 Ar step heating of inclusion-rich quartz grains provided an age of 254 .7 ± 2 .5 Ma ( Tohver et al ., 2012 ) .
Monazite dating in metapelites is an emerging method to investigate polymetamorphic areas . A protocol for Th-U-Pb dating of monazite by electron microprobe was adopted for a JEOL JXA-8530F .
aspects of finding, analysing and chemically dating monazite . We report techniques specifically deve-lopped for sample preparation, characterization and analysis of monazite . While monazite is a . . .
cires1 .colorado .edu › people › jones .craig › WUStectonics › CheyenneBelt › monazite .html
Dating monazite follows the U-Th total Pb age method which is described elsewhere in the 5690 website . I will not discuss the specifics of this system but I have included the equation from which an age is determined: Monazite crystallizing from igneous material may be concentrically zoned due to evolving melt composition .
The U-Th-Pb and (U-Th)/He dating methods applied to apatite, monazite , and xenotime have as their basis the decay series of the long-lived isotopes of uranium, 238 U and 235 U, and of thorium, 232 Th . These decay at a known rate through a series of short-lived radionuclides ultimately to Pb isotopes .
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Monazite Dating Methods