TY - JOUR
T1 - The high-pressure stability of talc and 10 Å phase
T2 - potential storage sites for H2O in subduction zones
AU - Pawley, A. R.
AU - Wood, B. J.
PY - 1995/1/1
Y1 - 1995/1/1
N2 - The pressure-temperature conditions of the reactions governing the high-pressure stability of talc were investigated in experiments on the bulk composition Mg3Si4O10(OH)2 + H2O at 2.9-6.8 GPa, 650-820°C, using piston-cylinder and multianvil apparatus. The reaction talc = enstatite + coesite + vapor was bracketed between 800 and 820°C at 2.90-2.95 GPa and between 770 and 780°C at 3.77-4.02 GPa. The lower-pressure bracket, which is just above the quartz-coesite phase transition, is consistent with some of the previous brackets on the reaction talc = enstatite + quartz + vapor and with the position of the talc dehydration reaction calculated using THERMOCALC v2.4. This revised version of THERMOCALC incorporates new compressibility and thermal expansivity data for talc. -from Authors
AB - The pressure-temperature conditions of the reactions governing the high-pressure stability of talc were investigated in experiments on the bulk composition Mg3Si4O10(OH)2 + H2O at 2.9-6.8 GPa, 650-820°C, using piston-cylinder and multianvil apparatus. The reaction talc = enstatite + coesite + vapor was bracketed between 800 and 820°C at 2.90-2.95 GPa and between 770 and 780°C at 3.77-4.02 GPa. The lower-pressure bracket, which is just above the quartz-coesite phase transition, is consistent with some of the previous brackets on the reaction talc = enstatite + quartz + vapor and with the position of the talc dehydration reaction calculated using THERMOCALC v2.4. This revised version of THERMOCALC incorporates new compressibility and thermal expansivity data for talc. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0029518686&partnerID=8YFLogxK
U2 - 10.2138/am-1995-9-1015
DO - 10.2138/am-1995-9-1015
M3 - Article
AN - SCOPUS:0029518686
SN - 0003-004X
VL - 80
SP - 998
EP - 1003
JO - American Mineralogist
JF - American Mineralogist
IS - 9-10
ER -