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Standard Chemical-based Tephra Extraction Methods Alter Volcanic Glass Shard Geochemistry..pdf

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Preview of Standard chemical-based tephra extraction methods alter volcanic glass shard geochemistry.
🔗 Source: eprints.whiterose.ac.uk
📊 Size: 434 KB
👤 Author: Cooper, CL, Savov, IP and Swindles, GT
⬇️ Downloads: 193

Summary

Standard chemical-based tephra extraction methods significantly alter the geochemistry of volcanic glass shards, particularly for basaltic and andesitic compositions. This study, led by Claire L. Cooper, Ivan P. Savov, and Graeme T. Swindles, tested ten samples of volcanic glasses from basalt to rhyolite using three common extraction methods: acid digestion (HCl, HNO3, H2SO4), base digestion (KOH), and density separation. The major element geochemistry of each sample was analyzed and compared to a control group. Key findings include:

- Basaltic and andesitic glasses are highly susceptible to chemical alteration, especially to concentrated corrosive materials used in acid and base digestion techniques.
- Alkali oxides (K2O, Na2O, CaO, MgO) and SiO2 are most susceptible to variation, while Al2O3 and FeO are the most stable.
- Felsic glasses are less susceptible to alteration by both acidic and alkaline digestions.
- The preferential preservation of rhyolitic over basaltic tephra in sediment records may be due to geochemical alteration during extraction methods.
- The study has important implications for interpreting the geochemistry of volcanic glasses in tephrochronology and volcanology.

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Standard tephra extraction methods alter volcanic glass shards' geochemistry.

Technical Information

  • File Format: PDF
  • File Size: 434 KB
  • Pages: 26
  • Language: EN
  • Author: Cooper, CL, Savov, IP and Swindles, GT
  • Total Downloads: 193
  • Last Updated: 4 days ago

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