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Cara L. Donnelly, William L. To provide better constraints on the sources of the kimberlite magmas and the timing of magmatism, we have carried out in situ U—Pb dating and Sr—Nd isotopic analysis of groundmass perovskite from four of the Kuruman kimberlites Bathlaros, Elston, Helpmekaar and Zero.

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All publications more feeds BibTeX file. Abstract Pb stepwise leaching PbSL has been successfully used to date rock-forming silicates.

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BoxBeijingChina E-mail: xieliewen mail. Laser ablation inductively coupled plasma mass spectrometry LA-ICP-MS is a powerful micro-analytical tool that has been widely used in geoscience because of its ability to rapidly and precisely analyze isotopes in situ with a typical spatial resolution of 30—80 microns. Here we present a new method for U—Pb dating of zircon with a higher spatial resolution at a scale of 5.

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Manuscript received: September 26, Corrected manuscript received: November 26, Manuscript accepted: December 1, It is critical, however, to perform the data reduction in a fast, transparent and customizable way that takes into account the specific analytical procedures employed in various laboratories and the outputs of different instruments. Its main strengths are transparency, robustness, speed, and the ability to be readily customized and adapted to specific analytical procedures used in different laboratories. Microanalytical techniques are gaining a widespread use in geosciences, because they provide a fast, precise and accurate way to determine compositional variations in glasses, minerals, and rocks.

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Our services include everything from analytical support to the promotion of multidisciplinary research in many of the earth science disciplines. User Fee Structure in Canadian dollars as of June 20, The categories above refer to Canadian-based research.

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Precambrian basement rocks exposed within tectonic windows in the North American Cordillera help to define the Precambrian crustal structure of western North America and possible reconstructions of the Late Proterozoic supercontinent Rodinia. The Archean rocks are exposed in the core of an antiform and mantled by a metaquartzite that may represent the nonconformity between basement and the overlying Hauser Lake gneiss, which is correlated with the Prichard Formation of the Belt Supergroup. A structurally higher sheet of augen gneiss interleaved with the Hauser Lake gneiss yields a U-Pb zircon crystallization age somewhat greater than Ma.

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Poulton, S. GSA Bulletin ; : — U-Pb geochronology of detrital zircon from Lower Jurassic to Lower Cretaceous strata of the southern Canadian Rocky Mountains fold-and-thrust belt documents the presence of zircon ages close to the time of sediment accumulation throughout this succession.

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Climate change. Geology of Britain. U-series and U-Pb capability for carbonate geochronology has been developed in the geochronology and tracers facility to support NERC climate research, benefitting from extensive knowledge transfer from our U- Th -Pb geochronology facility.

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High-precision U-Pb dating of accessory minerals to resolve timescales of geological processes. Or Triton TIMS was purchased from Thermo Scientific in and has been reliably serving for precise isotope ratio determination since then. The amplifiers of the 10 faraday cups were initially equipped with 5 1E12 Ohm, and 5 1E12 Ohm resistors. The 5 aplifiers with 1E12 Ohm resistors have now been replaced by 1E13 Ohm resistors, together with the respective gain calibration board and new software to allow for the tau correction.

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