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Phase transitions and decomposition relations in calcic plagioclase
| Content Provider | Semantic Scholar |
|---|---|
| Author | Grove, Timothy L. Ferry, John M. Spear, Frank S. |
| Copyright Year | 1983 |
| Abstract | A subsolidus temperature-composition diagram for the calcic portion of NaAlSi 3 O 8 -CaAl 2 Si 2 O 8 is derived from: (a) compositions of plagioclase crystallized under a range of metamorphic conditions; (b) TEM observations of coexisting andesine and bytownite; and (c) TEM and crystallographic studies from the literature. Proposed existence of two tricritical points: one tricritical point is a consequence of the C1 (super -) I (super -) transition; the other tricritical point is a consequence of the I1 (super -) P1 (super -) transition. The C1 (super -) I1 (super -) spinodal is responsible for two-phase intergrowths in labradorites and for BOeggild intergrowths (An 45 -An 65 ). The I1 (super -) P1 (super -) spinodal is responsible for Huttenlocher intergrowths (An 66 An 87 ).--Modified journal abstract. |
| Starting Page | 41 |
| Ending Page | 59 |
| Page Count | 19 |
| File Format | PDF HTM / HTML |
| Volume Number | 68 |
| Alternate Webpage(s) | http://ees2.geo.rpi.edu/MetaPetaRen/Publications/PDFpapers/Grove%20et%20al%20Plag.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |