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(U-Th)/He Dating of Phosphates: Apatite, Monazite, and Xenotime

Apatite He dating was first investigated by Zeitler et al. First, it should be a large gem-quality crystal, ensuring relatively uniform ablation behaviour, while saving the user the trouble of polishing and mounting large numbers of crystals in Indium. User Tools. PV would like to thank Richard Chater Imperial College London for supervision of the interferometric microscopy, and James Schwanethal for assistance with the noble gas measurements. Full text is not posted in this repository. For example, apatite usually has a few tens of ppm of both U and Th, while monazite and xenotime usually have hundreds of ppm to weight percent levels of these elements. Previous thermochronological data from SM obtained studies of the Hackspacher et al. MARIN 1. Future work will involve development of He thermochronology in new minerals e. Apatite He thermochronology has been used to study the exhumation-induced cooling history of samples in tectonically active and passive margins regions House et al.

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Meesters and Dunai a, b generalized the production-diffusion equations to diffusion domains of various shapes and arbitrary cooling histories. Helium chronometry of apatite and titanite using Nd-YAG laser heating. It is equipped with a modified Nier-type electron bombardment source with x and z focusing.

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The influence of natural radiation damage on helium diffusion kinetics in apatite. Enter the U, Th, and He concentrations into the helium ingrowth equation to calculate an age. Perkins, J. Earth and Planetary Science Letters , —67, Wernicke, and B.

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Research Methods - Thermochronology

Hurford and P. We thank Barry Kohn and Peter Zeitler for helpful comments. Contrib Mineral Petrol Figure 2 shows a calibration standard data collection output.

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