• journal_title：Journal of the Geological Society
• Contributor：Sandra McLaren ; W.James Dunlap ; Roger Powell
• Publisher：Geological Society of London
• Date：2007-
• Format：text/html
• Language：en
• Identifier：10.1144/0016-76492006-180
• journal_abbrev：Journal of the Geological Society
• issn：0016-7649
• volume：164
• issue：5
• firstpage：941
• section：Short Communication

Several descriptions of argon diffusion in K-feldspar have been developed, including the quantitative multiple-diffusion-domain (MDD) and multipath models and the qualitative ‘recrystallization’ model. These models remain contentious and the natural range in behaviour remains poorly understood. Feldspars from the Klokken syenite intrusion show a systematic relationship between ⁴⁰Ar/³⁹Ar age and microtexture suggesting that the loss of argon from different feldspars operates via different mechanisms such that the existing models represent only end-member scenarios. The MDD model can yield reliable thermal history information only for feldspars with pristine microtexture, with this model best viewed as a cipher for the real (but unknown) domain structure in such samples.