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Evidence for post-depositional diffusional loss of hydrogen in quartz phenocryst fragments within ignimbrites

  • Tamás Biró , István János Kovács EMAIL logo , Dávid Karátson , Roland Stalder , Edit Király , György Falus , Tamás Fancsik and Judit K. Sándorné
Published/Copyright: June 1, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 6

Abstract

Ignimbrite-hosted quartz phenocryst fragments contain much lower hydroxyl defect concentration than quartz in igneous rocks. Pre-eruptive and post-depositional loss of hydrogen were hypothesized as the main processes for lowering the initial magmatic concentrations of hydroxyl defects. The aim of this study was to examine the hydroxyl defect concentration of quartz phenocryst fragments from various vertical positions above the base of pyroclastic density current (PDC) deposits. It aims to record the vertical variations of hydroxyl defect concentrations to have an insight into potential post-depositional hydrogen loss of PDC deposits. Ignimbrite-hosted quartz phenocryst fragments were examined from two different ignimbrites in the Bükk Foreland Volcanic Area (North Hungary). Unpolarized micro-FTIR measurements on 23–35 unoriented crystal fragments from each sample were performed representing four different vertical positions of each site. Present results imply that hydroxyl defect concentrations show a pronounced decrease upward from the base of the deposits. The initial ~12 ppm hydroxyl defect concentration decreases to <3 ppm within <10 m from the base. Ignimbrites with contrasting degree of welding are characterized by different hydroxyl defect concentrations of quartz phenocryst fragments at the same height above the base. Thus, post-depositional dehydration is supposed to be the main factor causing the observed vertical decreasing trend. The modeling of post-depositional dehydration by considering typical ignimbrite emplacement temperatures (300–700 °C) and thicknesses (20–50 m) revealed that neither different cooling rates or different crystal diameters could cause the observed decrease in hydroxyl defect concentrations in ignimbrites. Other factors, such as contrasting pre-depositional thermal history, presence of melt- and fluid inclusion, and crack density of crystals could also play an important role in affecting the final hydroxyl defect concentrations.

Keywords: Quartz; FTIR spectrometry; water; ignimbrites; diffusion

Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html

Acknowledgments

We thank Zsolt Bendő for SEM-CL photography. This research was founded by the K115472 and K119740 Grant of the Hungarian Scientific Research Fund to D.K and I.K., respectively. This study was also supported by a Bolyai Postdoctoral Fellowship to I.K. and the 5.1. project of the Geological and Geophysical Institute of Hungary. We thank N.B. Casanova for her constructive editorial handling and Sylvie Deomouchy and Henrik Skogby whose suggestions helped us to improve significantly of our manuscript.

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Received: 2016-5-19
Accepted: 2017-2-10
Published Online: 2017-6-1
Published in Print: 2017-6-27

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5861
Keywords for this article
Quartz; FTIR spectrometry; water; ignimbrites; diffusion

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  9. Special collection: Water in nominally hydrous and anhydrous minerals
  10. Evidence for post-depositional diffusional loss of hydrogen in quartz phenocryst fragments within ignimbrites
  11. Special collection: Martian rocks and minerals: Perspectives from rovers, orbiters, and meteorites
  12. Visible to near-infrared MSL/Mastcam multispectral imaging: Initial results from select high-interest science targets within Gale Crater, Mars
  14. Multi-stage formation of REE minerals in the Palabora Carbonatite Complex, South Africa
  16. Spin orientation in solid solution hematite-ilmenite
  18. Constraints on aluminum and scandium substitution mechanisms in forsterite, periclase, and larnite: High-resolution NMR
  20. Shock-induced P-T conditions and formation mechanism of akimotoite-pyroxene glass assemblages in the Grove Mountains (GRV) 052082 (L6) meteorite
  22. The spin state of Fe3+ in lower mantle bridgmanite
  24. Reaction pathways and textural aspects of the replacement of anhydrite by calcite at 25 °C
  26. Majorite-olivine–high-Ca pyroxene assemblage in the shock-melt veins of Pervomaisky L6 chondrite
  28. Cu and Fe diffusion in rhyolitic melts during chalcocite “dissolution”: Implications for porphyry ore deposits and tektites
  30. Field-based accounting of CO2 sequestration in ultramafic mine wastes using portable X-ray diffraction
  32. NanoSIMS study of seismically deformed zircon: Evidence of Y, Yb, Ce, and P redistribution and resetting of radiogenic Pb
  34. Study on structure variations of incommensurately modulated labradorite feldspars with different cooling histories
  36. Carbocernaite from Bear Lodge, Wyoming: Crystal chemistry, paragenesis, and rare-earth fractionation on a microscale
  38. Magma mush chemistry at subduction zones, revealed by new melt major element inversion from calcic amphiboles
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