Revision 1 10110 words 1 Significance of tridymite distribution during cooling and 2 vapor-phase alteration of ignimbrites 3 4

10110 words 1 Significance of tridymite distribution during cooling and 2 vapor-phase alteration of ignimbrites 3 4 YULI HELED, MICHAEL C. ROWE, ISABELLE CHAMBEFORT, 5 COLIN J.N. WILSON 6 7 8 9 10 11 12 13 14 SCHOOL OF ENVIRONMENT, UNIVERSITY OF AUCKLAND, AUCKLAND, NEW ZEALAND, 1142. 15 GNS SCIENCE, WAIRAKEI RESEARCH CENTRE, TAUPO 3384, NEW ZEALAND 16 SCHOOL OF GEOGRAPHY, ENVIRONMENT AND EARTH SCIENCES, VICTORIA UNIVERSITY OF 17 WELLINGTON, WELLINGTON 6140, NEW ZEALAND 18 19 20 21 22 *Corresponding author: Tel (+64) 9 923 6681; Michael.rowe@auckland.ac.nz 23 24 25 26