Bramans gypsum outcrop, Bramans, Val-Cenis, Saint-Jean-de-Maurienne, Savoie, Auvergne-Rhône-Alpes, Francei
| Regional Level Types | |
|---|---|
| Bramans gypsum outcrop | Outcrop |
| Bramans | Commune (Former) |
| Val-Cenis | Commune |
| Saint-Jean-de-Maurienne | Arrondissement |
| Savoie | Department |
| Auvergne-Rhône-Alpes | Region |
| France | Country |
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Latitude & Longitude (WGS84):
45° 13' 16'' North , 6° 45' 45'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Bramans | 400 (2017) | 1.3km |
| Aussois | 686 (2016) | 1.8km |
| Avrieux | 356 (2016) | 3.6km |
| Villarodin-Bourget | 545 (2016) | 4.3km |
| Sollières-Sardières | 174 (2017) | 6.3km |
Outcrop of gypsum (anhydrite in depth) along D1006 road on the left bank of the Arc river, downstream of Bramans, close to a small dam (Barrage de Bramans).
The outcropping Triassic evaporitic rocks of the so-called Maurienne gypsum nappe (or "Nappe des Gypses" formation) consist of a sedimentary sequence of evaporites (mainly anhydrites), marine carbonates (dolomite), and clay layers (micaschists). Anhydrite rock is the most abundant rock of the sequence. Sedimentary bedding is underlined in white anhydrite by numerous pale gray layers that are commonly folded. Due to massive recrystallization, alpine foliations are most of the time invisible. Marine carbonates consist of centimeter to meter scale beds of grey dolomite. As these carbonate beds have been strongly folded and stretched by Alpine tectonics, they form various scale blocks more or less rounded and elongated within the main anhydrite layering, called "boudins". A secondary white dolomite, in which no sedimentary structures are visible, is frequently observed around marine carbonate blocks. Sedimentary clay layers have been transformed into micaschist rich in phengite by Alpine metamorphism.
Quartz and fluorite crystals from the evaporitic sequence contain fluid inclusions.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Albite Formula: Na(AlSi3O8) |
| ⓘ Anhydrite Formula: CaSO4 |
| ⓘ Dolomite Formula: CaMg(CO3)2 |
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Gypsum Formula: CaSO4 · 2H2O |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Phengite Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| ⓘ Native Sulphur Formula: S8 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Sulphur | 1.CC.05 | S8 |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Anhydrite | 7.AD.30 | CaSO4 |
| ⓘ | Gypsum | 7.CD.40 | CaSO4 · 2H2O |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Phengite | 9.EC.15 | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Gypsum | CaSO4 · 2H2O |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Dolomite | CaMg(CO3)2 |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Anhydrite | CaSO4 |
| O | ⓘ Dolomite | CaMg(CO3)2 |
| O | ⓘ Gypsum | CaSO4 · 2H2O |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| F | Fluorine | |
| F | ⓘ Fluorite | CaF2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Mg | Magnesium | |
| Mg | ⓘ Dolomite | CaMg(CO3)2 |
| Mg | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Anhydrite | CaSO4 |
| S | ⓘ Gypsum | CaSO4 · 2H2O |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Native Sulphur | S8 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Anhydrite | CaSO4 |
| Ca | ⓘ Dolomite | CaMg(CO3)2 |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Gypsum | CaSO4 · 2H2O |
| Fe | Iron | |
| Fe | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Fe | ⓘ Pyrite | FeS2 |
Other Regions, Features and Areas containing this locality
Eurasian PlateTectonic Plate
- AlpsAccretionary Complex
EuropeContinent
- The AlpsMountain Range
France
- Auvergne-Rhône-Alpes
- Savoie
- Maurienne ValleyValley
- Savoie
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