Extraction and purification of quartz in rock using hot-phosphoric acid for in situ cosmogenic exposure dating
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Date
2013-01-01
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Elsevier Science BV
Abstract
Quartz extraction and purification is essential for the successful measurement of Be-10 and Al-26 by AMS for exposure dating. The common procedure involves repetitive etching by ultrasonic heating and agitation in a dilute aqueous HF solution (2% w/w), which has proven adequate for quartz rich rock (i.e., granite, quartzite). We have developed an alternative method using hot phosphoric acid (250 degrees C), which preferentially dissolves silicates but not quartz. This method is particularly effective on samples with very low quartz abundance or with cryptocrystalline silica (i.e., greywacke, silcrete, chert) to enhance quartz recovery. We describe the method in detail and present data that compares the efficiency and the benefits of the two methods. © 2013, Elsevier Ltd.
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Keywords
Extraction, Purification, Quartz, Granites, Beryllium, Aluminium
Citation
Mifsud, C., Fujioka, T., & Fink, D. (2013). Extraction and purification of quartz in rock using hot-phosphoric acid for in situ cosmogenic exposure dating. Paper presented to the Twelfth International Conference on Accelerator Mass Spectrometry, Wellington, New Zealand, 20-25 March 2011. In Zondervan, A., Prior, C., Bruhn, F., & Sparks, R. (Eds), Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 294, 203-207. doi:10.1016/j.nimb.2012.08.037