Internal Ligurian Units are considered deformed and metamorphosed fragments of the Ligure-Piemontese oceanic basin. In this paper, we report on the temperature and pressure conditions of the metamorphic peak for four Internal Ligurian Units, estimated using different geothermometers and geobarometers based on the white mica and chlorite compositions. These minerals were formed during the D1 deformation phase in the pre-Oligocene. The results indicate that the Portello and Gottero units are both characterized by metamorphic conditions pertaining to low blueschists facies, while the Colli-Tavarone and Bracco-Val Graveglia Units show a lower metamorphic imprint that produces assemblages of prehnite-pumpellyite facies. The estimated geothermal gradient for the metamorphic peak achieved by the analyzed Internal Ligurian Units during the D1 phase is 7–15 °C/Km, which is indicative of deformation in a subduction setting. Under these conditions, the D1 phase developed in these units as a result of underplating at the base of the accretionary wedge during the closure of the Ligure-Piemontese basin. These data indicate a close geodynamic correlation among the Internal Ligurian Units and the ophiolite-bearing units of the Alps.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Albite

ⓘ 'Pumpellyite Subgroup'

ⓘ Quartz

ⓘ Zircon

9 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Albite

Formula: Na(AlSi₃O₈)

References:

Sanità, Edoardo, Di Rosa, Maria, Marroni, Michele, Meneghini, Francesca, Pandolfi, Luca (2024) Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) Minerals, 14 (1) doi:10.3390/min14010064

ⓘ Amesite

Formula: Mg₂Al(AlSiO₅)(OH)₄

References:

ⓘ Calcite

Formula: CaCO₃

References:

ⓘ Chamosite

Formula: (Fe²⁺)₅Al(Si,Al)₄O₁₀(OH,O)₈

References:

ⓘ Chamosite var. Daphnite

Formula: (Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈

References:

ⓘ 'Chlorite Group'

References:

ⓘ Clinochlore

Formula: Mg₅Al(AlSi₃O₁₀)(OH)₈

References:

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

ⓘ Muscovite var. Illite

Formula: K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂

References:

ⓘ Prehnite

Formula: Ca₂Al₂Si₃O₁₀(OH)₂

References:

ⓘ 'Pumpellyite Subgroup'

Formula: Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A

References:

ⓘ Quartz

Formula: SiO₂

References:

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
ⓘ	Muscovite var. Illite	9.EC.15	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
ⓘ		9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Chamosite	9.EC.55	(Fe²⁺)₅Al(Si,Al)₄O₁₀(OH,O)₈
ⓘ	Clinochlore	9.EC.55	Mg₅Al(AlSi₃O₁₀)(OH)₈
ⓘ	Chamosite var. Daphnite	9.EC.55	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
ⓘ	Amesite	9.ED.15	Mg₂Al(AlSiO₅)(OH)₄
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
Unclassified
ⓘ	'Chlorite Group'	-
ⓘ	'Pumpellyite Subgroup'	-	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
H	ⓘ Chamosite	(Fe²⁺)₅Al(Si,Al)₄O₁₀(OH,O)₈
H	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
H	ⓘ Chamosite var. Daphnite	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
H	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
O	ⓘ Calcite	CaCO₃
O	ⓘ Chamosite	(Fe²⁺)₅Al(Si,Al)₄O₁₀(OH,O)₈
O	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
O	ⓘ Chamosite var. Daphnite	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
O	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
O	ⓘ Quartz	SiO₂
O	ⓘ Zircon	Zr(SiO₄)
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Mg	Magnesium
Mg	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
Mg	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Mg	ⓘ Chamosite var. Daphnite	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
Al	ⓘ Chamosite	(Fe²⁺)₅Al(Si,Al)₄O₁₀(OH,O)₈
Al	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Al	ⓘ Chamosite var. Daphnite	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
Al	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Si	Silicon
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Amesite	Mg₂Al(AlSiO₅)(OH)₄
Si	ⓘ Chamosite	(Fe²⁺)₅Al(Si,Al)₄O₁₀(OH,O)₈
Si	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Si	ⓘ Chamosite var. Daphnite	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
Si	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Si	ⓘ Quartz	SiO₂
Si	ⓘ Zircon	Zr(SiO₄)
K	Potassium
K	ⓘ Muscovite var. Illite	K_0.65Al_2.0[Al_0.65Si_3.35O₁₀](OH)₂
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Fe	Iron
Fe	ⓘ Chamosite	(Fe²⁺)₅Al(Si,Al)₄O₁₀(OH,O)₈
Fe	ⓘ Chamosite var. Daphnite	(Fe,Mg)₅Al(Si,Al)₄O₁₀(OH)₈
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

[1]Sanità, Edoardo, Di Rosa, Maria, Marroni, Michele, Meneghini, Francesca, Pandolfi, Luca (2024) Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) Minerals, 14 (1) doi:10.3390/min14010064

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Mineral List

Rock Types Recorded

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

References

Internal Ligurian Units, Genoa, Liguria, Italy i
Regional Level Types
Internal Ligurian Units Formation
Genoa Metropolitan City
Liguria Administrative Region
Italy - not defined -