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Prabornaz Mine (Praborna Mine), Saint-Marcel, Aosta Valley, Italy

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Latitude & Longitude (WGS84): 45° 40' 45'' North , 7° 26' 57'' East
Latitude & Longitude (decimal): 45.67944,7.44944
GeoHash:G#: u0j7ce8w0
Other regions containing this locality:The Alps, Europe
Locality type:Mine
Köppen climate type:ET : Tundra
Name(s) in local language(s):Miniera di Prabornaz, Saint-Marcel, Valle d'Aosta, Italia


The manganese concentrations of Prabornaz are restricted to a 4x8 m thick quartzite unit of diverse lithologies which represent the basal part of the sedimentary cover of an ophiolite suite. Together they constituted the Piedmont Nappe which was metamorphosed up to the eclogite facies in Cretaceous times and was retrogressed in the early Tertiary.

The quartzite unit is composed of a succession of siliceous levels characterized by Mn-bearing minerals reflecting differences in chemical composition and oxygen fugacity inherited from the original sediments. The parageneses evolved during the polyphasic Alpine metamorphism passing through a pre-eclogite blue-schist facies event, the main eclogite facies event, and the several post-eclogite stages terminating in the greenschist facies.

These Mn concentrations were subsequently penetrated by several networks of cross-cutting veins and late fractures which were responsible for the mobilization of certain elements, in particular, K, Sr, and Ba.


Mineral List


65 valid minerals. 4 (TL) - type locality of valid minerals. 2 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Late Paleozoic
252.17 - 358.9 Ma



ID: 3192543
Paleozoic volcanic and intrusive rocks

Age: Paleozoic (252.17 - 358.9 Ma)

Comments: Alps

Lithology: Ophiolite complex; mafic volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Paleozoic
252.17 - 541 Ma



ID: 3158862
Palaeozoic mica

Age: Paleozoic (252.17 - 541 Ma)

Description: medium grade metamorphic

Lithology: Major:{mica schist}, Minor{marble,amphibolite,gneiss}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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

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Penfield, S.H. (1893) On some minerals from the manganese mines of St. Marcel in Piedmont Italy. American Journal of Science 46, 288-295.
Rondolino R. (1934) Sopra alcuni minerali di S. Marcel (Valle d'Aosta). Periodico di Mineralogia – Roma, 123-139.
Rondolino R. (1936) Sopra alcuni anfiboli manganesiferi di Praborna (San Marcel, Valle d'Aosta). Periodico di Mineralogia – Roma, 109-121.
Palache, C., Berman, H., and Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1021.
Bondi, M., Mottana, A., Kurat, G., and Rossi, G. (1978) Cristallochimica del violano e della schefferite di St. Marcel (Valle d'Aosta). Rendiconti della Società Italiana di Mineralogia e Petrologia, 34, 15-25.
Brown, P., Essene, E. J., and Peacor, D. R. (1978) The mineralogy and petrology of manganese-rich rocks from St. Marcel, Piedmont, Italy. Contrib. Mineral. Petrol. 67, 227-232.
Mottana, A., Rossi, G., Kracher, A., and Kurat, G. (1979) Violan revised: Mn bearing Omphacite and Diopside. Tschermaks Min. Petr. Mitt., 26, 187-210.
Martin, S. (1983) La mine de Praborna, Val d'Aoste (Italie): une série manganesifère metamorphoisée das la facies éclogite. These 3me cycle, Univ. Paris VI, xx pp.
Martin-Vernizzi, S. (1984) La mine de Praborna (Val d'Aoste, Italie: une série manganésifère métamorphisée dans le faciès éclogite. Thèse de doctorat, Université Pierre et Marie Curie, Paris, France.
Perseil, E.A. (1985) Some characteristics of manganese oxide facies in the deposit at St. Marcel-Praborna-Val d'Aosta, Italy. Miner. Deposita 20, 271-276. (in French)
Preite, D. (1985) La pagina dei Micromounts – Omfacite di Quincinetto e Praborna. Rivista Mineralogica Italiana, 9(2), 88.
Martin, S. and Kienast, J.R (1987) The HP-LT manganesiferous quartzites of Praborna, Piemonte ophiolite nappe, Italian Western Alps. Schweizerische Mineralogische und Petrographische Mitteilungen, 67, 339-360.
Perseil E.A. and Smith D.C. (1995) Sb-rich titanite in the manganese concentrations at St. Marcel-Praborna, Aosta Valley, Italy: petrography and crystal chemistry. Mineralogical Magazine: 59: 717-734.
Della Ventura, G., Mottana, A., Parodi, G.C., and Griffin, W.L. (1996) FTIR spectroscopy in the OH-stretching region of monoclinic epidotes from Praborna (St. Marcel, Aosta valley, Italy). Eur. J. Mineral., 8, 655-665.
Smith, D.C. and Perseil, E.-A. (1997) Sb-rich rutile in the manganese concentrations at St. Marcel-Praborna, Aosta Valley, Italy: petrology and crystal-chemistry. Mineralogical Magazine: 61: 655-669.
Perseil, E.-A. (1998) Evolution cristallochimique des oxydes de manganèse dans le gisement de St. Marcel Praborna (V. Aoste, Italie). Rend. Fis. Acc. Lincei, s. 9, v. 9 (1998) 4, 315-336.
Perseil, E.-A., Blanc, P., and Ohnenstetter, D. (2000) As-bearing fluorapatite in manganiferous deposits from St. Marcel - Praborna, Val d'Aosta, Italy. Canadian Mineralogist, 38, 101-117.
Piccoli, G.C., Maletto, G., Bosio, P., and Lombardo, B. (2007) Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
Tumiati, S., Martin, S., and Godard, G. (2010) Hydrothermal origin of manganese in the high-pressure ophiolite metasediments of Praborna ore deposit (Aosta Valley, Western Alps). European Journal of Mineralogy 22, 577-594.
Ciriotti, M.E., Cámara, F., Bittarello, E., and Ambrino, P. (2013) Macfallite: secondo ritrovamento italiano a Prabornaz. Micro, 11, 50-59.
Tumiati, S., Godard, G., Martin, S., Malaspina, N., and Poli, S. (2015) Ultra-oxidized rocks in subduction mélanges? Decoupling between oxygen fugacity and oxygen availability in a Mn-rich metasomatic environment. Lithos 226, 116-130.

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