Piston cylinder experiments were carried out, aimed at determining Ti solubility in andradite in upper mantle conditions (P=1.5-2.0 GPa, T= 1200-1300°C). Starting materials were Ti undersaturated and Ti- saturated (with respect to 1 atm) synthetic andradites. From unreversed experiments at 1.5 and 2.0 GPa, the maximum Ti contents in andradites were determined as 1.0-1.4 atoms per formula unit (a.p.f.u.), compared with 1.5 1.9 a.p.f.u. at 1 atm. Oxygen fugacity was not controlled in experimental runs. The main mechanism controlling the entry of Ti in the garnet structure at high pressure appears to be schorlomitic substitution, whereas some morimotoitic substitution may occur in Ti- undersaturated andradites.
Solubility of Ti in andradite under upper mantle conditions: preliminary results
Andrea Orlando;
2001
Abstract
Piston cylinder experiments were carried out, aimed at determining Ti solubility in andradite in upper mantle conditions (P=1.5-2.0 GPa, T= 1200-1300°C). Starting materials were Ti undersaturated and Ti- saturated (with respect to 1 atm) synthetic andradites. From unreversed experiments at 1.5 and 2.0 GPa, the maximum Ti contents in andradites were determined as 1.0-1.4 atoms per formula unit (a.p.f.u.), compared with 1.5 1.9 a.p.f.u. at 1 atm. Oxygen fugacity was not controlled in experimental runs. The main mechanism controlling the entry of Ti in the garnet structure at high pressure appears to be schorlomitic substitution, whereas some morimotoitic substitution may occur in Ti- undersaturated andradites.| File | Dimensione | Formato | |
|---|---|---|---|
|
prod_209571-doc_68997.pdf
solo utenti autorizzati
Descrizione: Solubility of Ti in andradite under upper mantle conditions: preliminary results
Tipologia:
Versione Editoriale (PDF)
Licenza:
NON PUBBLICO - Accesso privato/ristretto
Dimensione
383.38 kB
Formato
Adobe PDF
|
383.38 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
