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EnglishThe Cima d'Asta granitoid complex forms a high-K metaluminous calc-alkaline suite. The main pluton (MP) consists of biotite monzogranites with subordinate biotite ± hornblende tonalites and granodiorites. Fine-grained basic-intermediate rock types are present as small satellite bodies (Cima di Mezzogiorno: CM, Ponte Gardellin: PG and Arinas-Redasega: AR) around the main pluton as well as mafic microgranular enclaves (MME). The satellite bodies originated under different PH2O conditions. CM-PG and AR-MP rocks show distinct Fe/(Fe+Mg) evolution trends both in whole rock and biotite compositions. In addition, the two rock groups follow distinct redox paths. These contrasting characteristics could be related to: 1) distinct magma sources or to 2) different PH2O conditions. Mineral chemistry, trace and REE patterns as well as isotopic features strongly support an origin from a common source and favour the second hypothesis.
| Titolo: | Contrasting Fe-enrichment trends and redox paths in calc-alkaline granitoids from Cima d'Asta, southern Alps, Italy: the control of PH2O | |
| Autore/i: | Rottura A.; Del Moro A.; Caggianelli A.; Bargossi G. M.; Gasparotto G. | |
| Autore/i Unibo: | ||
| Anno: | 1995 | |
| Rivista: | ||
| Abstract: | The Cima d'Asta granitoid complex forms a high-K metaluminous calc-alkaline suite. The main pluton (MP) consists of biotite monzogranites with subordinate biotite ± hornblende tonalites and granodiorites. Fine-grained basic-intermediate rock types are present as small satellite bodies (Cima di Mezzogiorno: CM, Ponte Gardellin: PG and Arinas-Redasega: AR) around the main pluton as well as mafic microgranular enclaves (MME). The satellite bodies originated under different PH2O conditions. CM-PG and AR-MP rocks show distinct Fe/(Fe+Mg) evolution trends both in whole rock and biotite compositions. In addition, the two rock groups follow distinct redox paths. These contrasting characteristics could be related to: 1) distinct magma sources or to 2) different PH2O conditions. Mineral chemistry, trace and REE patterns as well as isotopic features strongly support an origin from a common source and favour the second hypothesis. | |
| Data stato definitivo: | 2022-04-29T17:04:13Z | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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