Variation in XANES in biotite as a function of orientation, crystal composition, and metamorphic history

• DOI: 10.2138/am.2014.4222
• Publication Date: 2014-02-14T17:47:09Z
• Authors: K. A. Evans; M. D. Dyar; S. M. Reddy; A. Lanzirotti; D. T. Adams; N. Tailby
• Keywords: Variation (astronomy)

Microscale analysis of ferrous:ferric iron ratios in silicate minerals has the potential to constrain geological processes but proved challenging because textural information and spatial resolution are limited with bulk techniques, in-situ methods have resolution.Synchrotron methods, such as XANES, been hampered by sensitivity spectra crystal orientation matrix effects.In an attempt break this nexus, biotites from Tanzania were characterised a combination optical microscopy, electron microprobe,