Journal Highlight: Towards a protocol for the trace element analysis of glass from rhyolitic shards in tephra deposits by laser ablation ICP-MS

Skip to Navigation

Ezine

  • Published: Nov 5, 2014
  • Author: spectroscopyNOW
  • Channels: Atomic
thumbnail image: Journal Highlight: Towards a protocol for the trace element analysis of glass from rhyolitic shards in tephra deposits by laser ablation ICP-MS
LA-ICP-MS analysis of rhyolitic glass shards was carried out using small ablation craters with calibration by a silicon internal standard to allow for interferences from calcium-rich phenocrysts and avoid issues related to the ablation of the mounting resin.



Towards a protocol for the trace element analysis of glass from rhyolitic shards in tephra deposits by laser ablation ICP-MS

Journal of Quaternary Science, 2014, 29, 627-640
Nicholas J. G. Pearce

Abstract: Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is used widely to analyse single volcanic glass shards from Quaternary tephra deposits for stratigraphic correlation. As yet, no generally accepted protocol for these analyses exists and published methods report significant differences in crater size and calibration strategies. Using Ca as the "internal standard" (CaI.S.), and not SiI.S., for the analysis of rhyolitic glass can cause significant problems, because of ablation of (i) Ca-rich phenocrysts, notably "ubiquitous" plagioclase, but also calcic-amphibole, apatite and allanite or (ii) mounting epoxy resin which can contribute to the Ca internal standard signal. Using CaI.S. can cause underreporting of many elements which concentrate in Ca-rich phenocrysts, making their ablation difficult to recognize, but when using SiI.S., no such underreporting occurs. Additionally, larger ablation craters (50 µm diameter) potentially incorporate even small volumes of phenocryst material, whereas smaller craters (<20 µm diameter) more frequently miss phenocrysts. Thus, for the LA-ICP-MS analysis of rhyolitic glass shards, smaller ablation craters should be employed and calibrated using SiI.S., allowing recognition and removal of analyses incorporating Ca-rich phenocrysts and avoiding issues related to the ablation of the mounting resin.

  • This paper is free to view for all users registered on spectroscopyNOW.com until the end of December 2014.
    After this time, you can purchase it using Pay-Per-View on Wiley Online Library.

Social Links

Share This Links

Bookmark and Share

Microsites

Suppliers Selection
Societies Selection

Banner Ad

Click here to see
all job opportunities

Most Viewed

Copyright Information

Interested in separation science? Visit our sister site separationsNOW.com

Copyright © 2017 John Wiley & Sons, Inc. All Rights Reserved