Liu Yu1, Stoppa F.2
(1. College of Zijin Mining, Fuzhou University, Fuzhou 350108, China；
2. Dipartimento Scienze della Terra, Università G. d’Annunzio, Chieti 66013，Italy)
Fig. Morphology of apatite from Vulcano island, Italy.
Abstract: Volatile compositions in apatite can indicate magma evolution and eruptive-chamber modelling. The volatile in apatites from Vesuvio and Volcano islands was studied with SEM\EDS, EPMA, XRD and IR and Raman spectroscopy. It is found that main substitution among F-OH-Cl ions occurs in structural channel, and there is little substitution for the Ca sites and tetrahedral sites. The apatite from Volcano Island contains less S and much Cl, and with a small cell parameter ratio c/a, indicating the condition of lower pressure and higher temperature. On the other hand, channel ions in the apatite from Vesuvio are mainly OH-F, crystallized from a higher pressure and lower temperature zoned magmatic chamber, in which Cl volatile enrichs in the upper chamber meanwhile F in the lower part.
Key words: apatite ; volatile ; structural channel ; substitution
E-mail: liuyu@fzu.edu.cn
ACTA MINERALOGICA SINICA Vol. 31, No. 2, 2011, Page 180-184
