Other
Scientific paper
Jan 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..21..217m&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 21, Issue 3-4, p. 217-238.
Other
16
Scientific paper
The stability relations among minerals of the zircon-thorite group and the effect of related oxides on them have been studied under both “ry” and hydrothermal conditions. The problem of “hydrous” zircons and its relation to the metamict state has been investigated both experimentally and theoretically. From the data it appears that hydrous zircons and thorites do not involve OH- substitution for O2- with omission of Si4+, but rather are formed by strong water adsorption in metamictized zircon and thorite. The phase equilibrium involved in the thorite-huttonite polymorphism has been studied and it is concluded that huttonite is the only stable polymorph of ThSiO4. Zircon dissociates at 1550±50°C to ZrO2+SiO2. The Alkemade triangles in the ternary systems ZrO2-ThO2-SiO2 and ZrO2-UO2-SiO2 have been determined and a not-impossible diagram is presented for the system ThO2-UO2-SiO2. The extent of solid solution between ZrSiO4-ThSiO4, ZrSiO4-“USiO4” and ThSiO4-“USiO4” is discussed in connexion with the composition of natural zircon and thorite. The application of the experimental data to natural mineral assemblages is discussed.
Mumpton F. A.
Roy Rahul
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