Proton microprobe for chemical dating of monazite Interactive dating simulator adult

The partitioning of Y and HREE between garnet, monazite, and xenotime may be the most commonly used and successful link between monazite and chemical reactions.

proton microprobe for chemical dating of monazite-24

primary beam was used to sputter a 5∼7-μm-diameter crater and secondary positive ions were extracted for mass analysis using a Mattauch-Herzog geometry.

The multi-collector system was modified to simultaneously detect ions.

Then 44 monazite grains extracted from a sedimentary rock in Taiwan were analyzed.

Observed ages were compared with the U-Th-Pb chemical ages by electron microprobe.

The second broad group of garnet-monazite connections involves decompression of a wide variety of garnet-bearing rocks, where cordierite, orthopyroxene, or plagioclase are produced at the expense of garnet. (2006) Dating metamorphic reactions and fluid flow: Application to exhumation of high-P granulites in a crustal-scale shear zone, western Canadian Shield.

These decompression reactions often involve loss of a significant amount of garnet, and perhaps an associated generation of Y-rich monazite.

Therefore, Pb SL is indeed capable of discriminating common and radiogenic Pb from a single phase.

During leaching, a well defined reaction front is seen to advance into the grains.

Pb ages also agree with the chemical ages while there are a few discordant samples.

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