U pb dating of zircon by la icp ms eva mendes dating

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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.

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.

A single polished thin section (60 micron thick recommended) can be mapped for element abundances and phase proporations in roughly 1.5 hours at 30 micron resolution using a 40k V 500u A beam.

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

The main disadvantage is the lower resolution of the images - but this will continue to improve with planned hardware upgrades to the microscope objectives and digital camera head.

Three views of a detrtial zircon sample are shown below (transmiited light, reflected light, and cold-cathode true colour CL). Winter 2015 - Synthesis of glass reference standards using high-T flux-free fusion We have begun experimenting with the creation of matrix-matched glasses using powdered minerals as starting materials.

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