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As a result, we have lowered our fees for all service levels. Under these new conditions 50% signal washout is achieved in 100ms with 99.9% washout reached in 3. New advances in in-situ U-Pb geochronology of unconventional minerals We have been using well-characterized geological settings to test the viability in-situ U-Pb geochronology of U-bearing minerals such as: Andraditic garnet, uraninite, cassiterite, columbite-tantalite. New Monocle software for Iolite3.5 incorporated into routine mapping applications The recently published description of Monocle by Kamber et al (2017) provides a new way forward for trace-element and geochronology studies. March 2017 Laser-milling of garnet for spatially-controlled Lu-Hf and Sm-Nd geochronology In collaboration with colleagues from University of Albama, we are refining a process to liberate domains (e.g., cores) from garnet in doubly-polished thick (100um) sections guided by major, minor, and trace-element mapping. In-situ Pb-Pb isotope measurements in galena The lab has established and verified a methodology to measure Pb-Pb isotopes in galena with a grand weighted mean precision of 0.05-0.1%. Installation and commissioning of Bruker M4 Tornado micro-XRF This new CFI and NBIF suppored instrument provides fast elemental mapping capabilities and EDS-based quantitation of materials at much higher sensitivity that electron-beam instruments.A suite of potential primary and secondary standards for columbite-tantalite dating has been recently established. The goal is to refine this process to help transform the robustness of Lu-Hf and Sm-Nd studies involving garnet-wholerock isochrons. The method is incredibly flexible, being applicable to 1mm diameter grains exposed in polished thin sections are liberated and mounted to exposed a flat cleavage face. The instrument has a Rh X-ray tube with polycapillary focusing to 20 um, dual SDD detectors (130-140 e V resolution), a large stage and vacuum mode to enhance light element performance.For collaborative projects we encourage PIs to be on-hand if possible to help direct the acquisition of LA-ICP-MS data.

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Images (click on images for a larger version): installed M4 Tornado; mosaic of polished thick(60 um) section; multi-element map of sample; distribution of apatite and zircon revealed by P (Ca not shown) and Zr; overlay of element map in Geostar with reflected mosaic of an area containing several 50-100 um apatite grains (green in element map). An array of CL photomicrographs collected within a conventional DSLR (operated high ISO800 and 5sec exposure with noise reduction) are collected, automatically stitched using Microsoft Image Composite Editor (ICE), and enhanced in Photoshop.

the stitched CL image is then imported into offline Geostar software and used to guide the locations of ablation targets.

This is sufficient to map the distribution of large accessory minerals (e.g., 50 um diameter) we routinely use for geochronology (see below).

The elemental maps can be exported (as .jpg) and used as image overlays in the laser software (Geostar v7).

Detection limiits are lowest for transition metals (10s of ppm).

The instrument is available for use on a cost-recovery basis with technical support from lab staff. Resurrection and integration of cold-cathode CL system (Nuclide Corporation Luminoscope: This cold-cathode optical CL system allows us to rapidly collect true-colour CL mosaics over larger areas.

For obvious targets it is acceptable to simply circle the areas of interest.

For small targets, detailed reflected light images (e.g., taken using a 10x objective) or SEM/BSE images are required to help guide the identification of target grains.

The existing Spectra CIROS CCD ICP-IOES is also housed in this lab. A fee structure is listed at the bottom of this page.

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