✦ LIBER ✦
Order-disorder relations in natural and heated rhomb porphyry plagioclases
✍ Scribed by A. B. Harnik; Gorica Šoptrajanova
- Book ID
- 104745593
- Publisher
- Springer
- Year
- 1973
- Tongue
- English
- Weight
- 266 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0010-7999
No coin nor oath required. For personal study only.
✦ Synopsis
Several plagioclase samples from core and rim of rhomb porphyry phenocrysts of the Oslo region were heated under dry conditions at 1050 ~ C for 1, 10, 97, and 811 hours. X-ray powder photographs show that the structurally disordered to intermediate core and rim plagioclases crystallized under similar conditions. Between the slope of the [(2 0131--2 01~1) vs. heating timeJ-curve and the potassium content in solid solution of these plagioclases exists the relation: the lower the K content, the steeper is the slope.