Cala dei Mugni (Mugni beach), Franco Promontory, Giglio Island, Isola del Giglio, Grosseto Province, Tuscany, Italyi
Regional Level Types | |
---|---|
Cala dei Mugni (Mugni beach) | - not defined - |
Franco Promontory | - not defined - |
Giglio Island | Island |
Isola del Giglio | Commune |
Grosseto Province | Province |
Tuscany | Region |
Italy | - not defined - |
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Latitude & Longitude (WGS84):
42° North , 10° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~5km
KΓΆppen climate type:
Mindat Locality ID:
266501
Long-form identifier:
mindat:1:2:266501:9
GUID (UUID V4):
92f7771b-065a-4355-815a-184281bf9161
Name(s) in local language(s):
Cala dei Mugni (Spiaggia dei Mugni), Promontorio del Franco, Isola del Giglio, Provincia di Grosseto, Toscana, Italia
At Cala dei Mugni there is a spectacular outcrop that illustrates the succession of two main deformation and metamorphic episodes, which are characteristic of the early Apennine orogenic history. The first episode is related to the HP/LT stage, the second to the retrogressive stage with a final re-equilibration in the low-grade greenschist facies during eastward-directed shearing.
Verrucano rocks exposed at Cala dei Mugni consist of ferrocarpholite, phengite, chlorite, quartz, and minor ankerite. Late, static formation of green biotite is locally observed. Fibrous ferrocarpholite crystals are commonly observed on quartz-rich segregations lying parallel to the foliation planes.
Ferrocarpholite compositions range from XMg= 0.37 to 0.41. Ferrocarpholite phenoblasts are locally replaced by fine-grained aggregates of phyllosilicates (white mica + chlorite). Further alteration of carpholite produced kaolinite. The absence of chloritoid indicates that the exhumation path did not cross the chloritoid-producing carpholite breakdown reaction, and hence, the P-T gradient must have remained relatively cool. Replacement of ferrocarpholite by late kaolinite suggests cooling during decompression within the kaolinite + quartz stability field. Finally, the presence of static green biotite in some samples reflects a late influence by the nearby pluton and a short-lived temperature increase to about 400Β°C.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
β Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
β 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
β 'Chlorite Group' |
β Ferrocarpholite Formula: Fe2+Al2Si2O6(OH)4 |
β Kaolinite Formula: Al2(Si2O5)(OH)4 |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Phengite Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
β Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 4 - Oxides and Hydroxides | |||
---|---|---|---|
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
Group 9 - Silicates | |||
β | Ferrocarpholite | 9.DB.05 | Fe2+Al2Si2O6(OH)4 |
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Phengite | 9.EC.15 | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
β | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
Unclassified | |||
β | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
β | 'Chlorite Group' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
H | β Ferrocarpholite | Fe2+Al2Si2O6(OH)4 |
H | β Kaolinite | Al2(Si2O5)(OH)4 |
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
C | Carbon | |
C | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
O | Oxygen | |
O | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
O | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
O | β Ferrocarpholite | Fe2+Al2Si2O6(OH)4 |
O | β Kaolinite | Al2(Si2O5)(OH)4 |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
O | β Quartz | SiO2 |
F | Fluorine | |
F | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Mg | Magnesium | |
Mg | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
Mg | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Mg | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Al | Aluminium | |
Al | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Al | β Ferrocarpholite | Fe2+Al2Si2O6(OH)4 |
Al | β Kaolinite | Al2(Si2O5)(OH)4 |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Si | Silicon | |
Si | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Si | β Ferrocarpholite | Fe2+Al2Si2O6(OH)4 |
Si | β Kaolinite | Al2(Si2O5)(OH)4 |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Si | β Quartz | SiO2 |
K | Potassium | |
K | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Ca | Calcium | |
Ca | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
Ti | Titanium | |
Ti | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | Iron | |
Fe | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
Fe | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | β Ferrocarpholite | Fe2+Al2Si2O6(OH)4 |
Fe | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Other Regions, Features and Areas containing this locality
Eurasian PlateTectonic Plate
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