Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.222..235w&link_type=abstract
Earth and Planetary Science Letters, Volume 222, Issue 1, p. 235-241.
Physics
Monalbite, Albite, Jadeite, Transmission Electron Microscope, Dabie Mountains, Uhp Metamorphism
Scientific paper
Natural ``monalbite'' (MA) has been observed on a submicron-scale in jadeite along with high albite (HA) and low albite (LA) in jadeite quartzite in the Dabie ultrahigh-pressure (UHP) metamorphic terrane, China. Transmission electron microscope (TEM) observation of inclusions in jadeite crystals has revealed mineral phases with C2/m and C1¯ structures. The cell parameters of the C2/m crystal structure correspond to those of MA, whereas the cell parameters of C1¯ structure are identical to those of HA and LA. The existence of the C2/m structure shows that the jadeite underwent partial change to MA on a submicron-scale during retrograde metamorphism. Albite transformation twinning of HA suggests the transformation of MA into HA. MA occurrence provides powerful evidence of high-temperature metamorphism during exhumation, probably above 930 °C. The preservation of MA may be due to the armouring by the jadeite and implies a very rapid cooling (quenching) during retrogression.
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Han Yujing
Meng Dawei
Wu Xiuling
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