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Plutone della Bregaglia
- Origin of the Name
- Rank
- lithostratigraphic Group
- Status
- informal term
- Age
- Oligocene
- In short
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The Bregaglia Intrusion forms a large plutonic body between the Val Bregaglia in the north and the Tonale Fault in the south; it extends with a narrow tail of about 40 km westward along the Tonale Fault (Insubric Fault). It comprises mainly calc-alkaline tonalite and granodiorite, derived from a primitive mantle melt and channeled from the base of the continental crust into the Periadriatic Fault System. The base of the pluton overlying the Gruf Complex shows evidence of synmagmatic folding and thrusting indicating contemporaneous late stage N–S shortening. Crystallization and emplacement of the Bregaglia Intrusion took place between 32 and 28 Ma. A smaller body related to the Bregaglia Intrusion crops out northwest of Sondrio (Triangia Pluton), where it intrudes the subvertical Tonale Nappe and its contact with the adjacent root zone of the Campo Nappe Complex.
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Aplite di Zocca
- Name Origin
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
- In short
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Filoni aplitici e pegmatitici.
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Microgranito del Monte Rosso
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
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Granodiorite dell'Alpe Cameraccio
- Name Origin
- Rank
- lithostratigraphic Formation
- Status
- local name (informal)
- In short
- Granodiorite massicco a grana fine, senza megacristalli.
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Minestronite
- Rank
- petrographic facies
- Status
- incorrect name (though informally used)
- In short
- Brecce di gabbri, di serzzo e di rocce incassanti, cementate da ghiandone.
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Granodiorite della Bregaglia (ghiandone)
- Rank
- lithostratigraphic Formation
- Status
- informal term
- Nomenclatorial Remarks
- <p>Ghiandone auct.</p>
- In short
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Porphyrischer («klotziger») Granodioritischer Kern der Bergell-Intrusion.
- Age
- early Oligocene
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Granodiorite della Val Màsino
- Name Origin
- Status
- valid formal name
- Nomenclatorial Remarks
- ghiandone auct., Bergellergranit, Disgraziagranit [sic]
- In short
- Granodiorite con porfiroblasti di K-feldspato, talora orientati, da la parte centrale ed orientale del plutone della Val-Màsino-Bregaglia-Iorio.
- Age
- early Oligocene
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Melirolo-Augengneis
- Name Origin
-
Melirolo (TI), Val Morobbia
- Status
- informal term
- In short
- Granodiorite ad orneblenda, con "occhi" di plagioclasio. Südliche Randfazies des Iorio-Tonalites.
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Tonalite della Bregaglia (serizzo)
- Rank
- lithostratigraphic Formation
- Status
- informal term
- Nomenclatorial Remarks
- serizzo auct., Hornblendegneiss (Théobald 1866 S.254), Syenit (Théobald 1866 S.256), gneiss anfibolico (porphiroide) (Melzi 1893 S.110)
- In short
- Tonalitische (quarzdioritische) Hülle der Bergell-Intrusion, die von der Bergell-Granodiorit intrudiert und vergneist wurde.
- Age
- early Oligocene
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Quarzdiorite del Monte Bassetta
- Name Origin
- Status
- valid formal name
- Nomenclatorial Remarks
- serizzo auct., Bergell-Tonalit, Masino-Tonalit
- In short
- Diorite quarzosa epidotica, orientata, con passagi a tonaliti o gabbri al bordo meridionale e sud-orientale del plutone di Val Màsino-Bregaglia-Iorio.
- Age
- early Oligocene
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Tonalite di Sòrico
- Name Origin
- Status
- local name (informal)
- In short
- Tonaliti e dioriti epidotiche, simili al serizzo, ma più laminate, con frequenti inclusi basici e di rocce incassanti.
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Tonalite di San Iorio
- Name Origin
- Status
- local name (informal)
- Nomenclatorial Remarks
- Horneblendegneiss auct.