Monazite dating methods limitations. Dating - the isochron method | dating.freebeeb.net
The incremental additions of the daughter type can then be viewed in proportion to the abundance of parent atoms.
It can be used with both Th-rich phases and more U- rich phases, such as zircon or xenotime. When a single body of liquid rock crystallizes, parent and daughter elements may separate so that, once solid, the isotopic data would define a series of points, such as those shown as open circles designated R1, R2, R3 in Figure 1.
Electron microprobe dating of monazite by most geochronological methods, such as Rb-Sr dating of biotite, or K-At dating.
Instruments and procedures Use of mass spectrometers The age of a geologic sample is measured on as little as a billionth of a gram of daughter isotopes. By careful selection, certain minerals that contain little or no daughter element but abundant parent element can be analyzed. Large monazite overgrown apatite has been identified in several deposits [ 18 ] up to 2 mm in diameter; Figure 3 f; e.
Of course, the ability to analyze samples weighing only a few millionths of a gram was essential to this development.
Category:Geochronological dating methods
The skill of a geochronologist is demonstrated by the ability to attain the knowledge required and the precision necessary with the least number of analyses.
As the sample is heated and vaporizes under the vacuum in the source area of the mass spectrometer, it is commonly observed that the lighter isotopes come off first, causing a bias in the measured values that changes during the analysis. Supergene monazite during the weathering process shows higher Y and MREE contents when compared to the primary monazite from the same complex [ 8 ].
The Ce pivot point was not observed for monazite in the Mt. Not only has this led to a reduction in sample size and measurement errors but it also has permitted a whole new range of problems to be investigated.
Therefore, it is always important to consider the application at hand when selecting the analytical technique.
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