Writers : Yousef Zadeh, M. H.; Sabzei, M.
Refference : 28th Symposium on Geosciences and the 14th Symposium on Geological Society of Iran
Publishing Year : 1389

Abstract :

The tertiary dacitic rocks in the north of Birjand have vast expanding and abundant amphibolitic xenoliths. Plagioclase and amphibole are the most components Determination of temperature and pressure of these rocks based on Al content in amphibole indicate that dacitic rocks are formed in 784.20-803.70 °C temperature and 5.11-5.88 Kbar pressure equivalent to 5.11-5.88 Km depths and xenoliths are formed in 777.21- 844.77 °C temperature and 4.83-7.50 Kbar pressure equivalent depths. The more extensive domain of xenoliths related to host rocks indicates that those are formed at more depths during a regional metamorphism in the latter parts of amphibolite facies at first and then those are born a retrograde contact metamorphism in the course of falling in the rising magma. Microscopic evidence for example transformation of core brown hornblende to margin green hornblende is confirmed this matter.

Subject List : Geothromobarometry