IRIS – Institutional Research Information System
IRIS è il sistema di gestione della ricerca dell’Università degli Studi di Milano-Bicocca.Il repository BOA è il modulo del sistema dedicato alla raccolta e alla disseminazione della produzione scientifica di Ateneo. Le pubblicazioni sono ricercabili per parola chiave attraverso il box nella barra orizzontale in alto oppure, mediante il pulsante Sfoglia, per "Afferenza", "Autore", "Titolo", "Tipologia" o "Settore scientifico-disciplinare".
IRIS contiene inoltre alcuni moduli dedicati alla registrazione dei progetti e dei contratti, e alla reportistica avanzata per le attività di valutazione della ricerca
EnglishFine-grained peraluminous synkinematic leuco-monzogranites (SKG), of Cambro-Ordovician age, occur as veins and sills (up to 20-30 m thick) in the Deep Freeze Range, within the medium to high-grade metamorphics of the Wilson Terrane. Secondary fibrolite + graphite intergrowths occur in feldspars and subordinately in quartz. Four main solid and fluid inclusion populations are observed: primary mixed CO2 + H2O inclusions + Al2SiO5 +/- brines in garnet (type 1) ; early CO2-rich inclusions (+/- brines) in quartz (type 2) ; early CO2 + CH4 (up to 4 mol%) +/- H2O inclusions + graphite + fibrolite in quartz (type 3); late CH4 + CO2 + N2 inclusions and H2O inclusions in quartz (type 4). Densities of type 1 inclusions are consistent with the crystallization conditions of SKG (almost-equal-to 750-degrees-C and 3 kbar). The other types are post-magmatic: densities of type 2 and 3 inclusions suggest isobaric cooling at high temperature (almost-equal-to 700 -550-degrees-C). Type 4 inclusions were trapped below 500-degrees-C. The SKG crystallized from a magma that was at some stage vapour-saturated; fluids were CO2-rich, possibly with immiscible brines. CO2-rich fluids (+/- brines) characterize the transition from magmatic to post-magmatic stages; progressive isobaric cooling (T< 670-degrees-C) led to a continuous decrease of f(O2), entering in the graphite stability field; at the same time, the feldspars reacted with CO2-rich fluids to give secondary fibrolite + graphite. Decrease of T and f(O2) can explain the progressive variation in the fluid composition from CO2-rich to CH4 and water dominated in a closed system (in situ evolution). The presence of N2 the late stages indicates interaction with external metamorphic fluids.
Frezzotti, M., Di Vincenzo, G., Ghezzo, C., & Burke, E. (1994). Evidence of magmatic CO2-rich Fluids in Peraluminous Graphite-Bearing Leukogranites from deep Freeze Range (Northern Victoria Land, Antarctica). CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, 117(2), 111-123.
| Citazione: | Frezzotti, M., Di Vincenzo, G., Ghezzo, C., & Burke, E. (1994). Evidence of magmatic CO2-rich Fluids in Peraluminous Graphite-Bearing Leukogranites from deep Freeze Range (Northern Victoria Land, Antarctica). CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, 117(2), 111-123. | |
| Tipo: | Articolo in rivista - Articolo scientifico | |
| Carattere della pubblicazione: | Scientifica | |
| Presenza di un coautore afferente ad Istituzioni straniere: | Si | |
| Titolo: | Evidence of magmatic CO2-rich Fluids in Peraluminous Graphite-Bearing Leukogranites from deep Freeze Range (Northern Victoria Land, Antarctica) | |
| Autori: | Frezzotti, M; Di Vincenzo, G; Ghezzo, C; Burke, E | |
| Autori: | ||
| Data di pubblicazione: | 1994 | |
| Lingua: | English | |
| Rivista: | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/BF00286836 | |
| Appare nelle tipologie: | 01 - Articolo su rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| 6) Frezzotti et al., 1994.pdf | N/A | Administrator Richiedi una copia |
Copyright © 2021