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Your access to the NCBI website at gov has been temporarily blocked due to a possible misuse/abuse situation involving your site.This is not an indication of a security issue such as a virus or attack.The reproducibility is 2–4% (2RSD) for Pb, only slightly greater than long-term data for zircon reference materials.We show in a rutile provenance study from young orogens (Bhutan Himalaya and Canadian Cordillera) that the sensitivity of our analytical set-up allows dating of ~ 90% of rutiles in a sediment using a 50 μm laser ablation spotsize within samples containing rutile as young as 10–20 Ma, and obviates the requirement for U concentration pre-screening, thus reducing or eliminating rutile selection bias.LA-MC-ICPMS was used to analyse Pb isotopes in rutile from granulite-facies rocks from the Reynolds Range, Northern Territory, Australia.The resultant ages were compared with previous U–Pb zircon and monazite age determinations and new mica (muscovite, phlogopite, and biotite) Rb–Sr ages from the same metamorphic terrane.Even small rutile crystals are extremely resistant to isotopic resetting. 3 °C/Myr, the estimates for monazite and other high temperature geochronometers, which have been revised upwards in recent years.The new rutile ages, together with the other geochronological data from the region, support the interpretation that the Reynolds Range underwent prolonged slow cooling on a conductive geotherm, under nearly steady-state conditions.

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The mean of 12 isochron ages is 1544 ± 8 Ma (2 SD), with isochron ages for single crystals having uncertainties as low as ±1.3 Myr (2 SD).

The of monazite ⩽0.1 mm in diameter, but significantly higher than the Rb–Sr system in muscovite (550 °C), phlogopite (435 °C) and biotite (400 °C).

Rutile crystals ranging in size from 3.5 to 0.05 mm with ⩽20 ppm Pb were ablated with a 300–25 μm diameter laser beam.

Crystals larger than 0.5 mm yielded sufficiently precise Pb ratios to correct for the presence of common Pb, and individual rutile crystals often exhibited sufficient Pb isotopic heterogeneity to allow isochron calculations to be performed on replicate analyses of a single crystal.

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