U_Pb_Geochronology

A wednesday 15 august 12 200 microns 99nc19b pop a

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Unformatted text preview: dnesday, 15 August, 12 200 microns 99NC19B: Pop. A 99NC19B: Fraction A2 Wednesday, 15 August, 12 200 microns 200 microns Wednesday, 15 August, 12 http://www.eos.ubc.ca/research/pcigr/ChemLab/ ChemPhoto5.htm http://www.carleton.ca/iggrc/101.htm Wednesday, 15 August, 12 http://www.eos.ubc.ca/research/pcigr/Instrumentation.htm#TIMS TIMS: Thermal Ionization Mass Spectrometry Wednesday, 15 August, 12 http://www.eos.ubc.ca/research/pcigr/Instrumentation.htm#TIMS TIMS: Thermal Ionization Mass Spectrometry Wednesday, 15 August, 12 In Situ U-Pb Analysis: SHRIMP • • SHRIMP = Sensitive High Resolution Ion Microprobe • Developed at ANU in Australia in 70s and been upgraded and modified since. • • Very expensive instruments (usually >$2 million). • Great when ultra-high precision not needed, when doing large volumes of analyses (e.g., detrital zircon dating), or when you need spatial resolution (e.g., inheritance patterns, overgrowths on grains). • Typically use TIMS/SHRIMP in tandem....
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