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Pizzo Paglia pegmatite dyke, Leggia Valley, Leggia, Grono, Moesa, Mesolcina Valley (Misox), Grischun (Grisons; Graubünden), Switzerland

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Latitude & Longitude (WGS84): 46° 13' 58'' North , 9° 13' 1'' East
Latitude & Longitude (decimal): 46.23293,9.21711
GeoHash:G#: u0nx18rwq
Other regions containing this locality:The Alps, Europe
Köppen climate type:Dfc : Subarctic climate
Name(s) in local language(s):Filone pegmatitico del Pizzo Paglia, Val Leggia, Leggia, Grono, Moesa (Moesano), Val Mesolcina (Valle Mesolcina; Misox), Graubünden (Grisons; Grischun; Grigioni), Schweiz (Suisse; Svizzera)


LCT pegmatite dyke at 2385 m, discoverd in summer 2009.

The pegmatite body is both hosted in amphibolite rocks and migmatite gneiss of the Bellinzona-Dascio Zone, Southern Steep Belt of the Central Alps. The dyke outcrops for 20 m and can attain 3-4 m in thickness. The lower portion (lower end) of the dyke is concordant with the foliation of leucocratic migmatite gneiss. Here, the pegmatite reaches the maximum width (3-4 metres) due to the coalescence with a lateral pegmatite dyke. The border-wall zone of the pegmatite is coarse-grained (up to 10 cm) and consists of idiomorphic white perthitic K-feldspar, albite, large aggregates of silvery muscovite and subordinate brownish vitreous quartz masses. The core zone has giant texture (up to metre) and consists of huge euhedral perthitic K-feldspar projecting into large masses of brownish to smoky vitreous quartz. In the intermediate-core zone of the pegmatite large euhedral crystals of red almandine-spessartine crystal with trapezohedral habit occur. They are associated with sky-blue to greenish, vitreous, centimetre-sized hexagonal prisms of beryl, prisms of black schorl, and greyish millimetre-sized zircon. The upper portion (upper end) of the pegmatite, hosted by black amphibolite rock, narrows and reaches one metre in width. In this section the coarse-grained (centimetre-sized) texture is characterized by white perthitic K-feldspar, albite, and quartz. Centimetre-sized primary miarolitic cavities lined with albite, K-feldspar, quartz, and acicular prisms of black schorl also occur. This pegmatite portion hosts black centimetre-sized prisms of schorl which diffuse along the exocontacts and permeate the amphibolite.


Mineral List


7 valid minerals.

Rock Types Recorded

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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

Unknown
Ma



ID: 2346840
Metamorphe Gesteine, meist Metasedimente

Age: Anthropocene ( Ma)

Lithology: Gneiss and mica schist

Reference: Geological Institute. Geological Map of Switzerland 1:500,000. isbn: 3906723399. University of Bern. [49]

Late Paleozoic
252.17 - 358.9 Ma



ID: 3192871
Paleozoic intrusive rocks

Age: Paleozoic (252.17 - 358.9 Ma)

Comments: Alps

Lithology: Intrusive igneous 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 - Proterozoic
252.17 - 2500 Ma



ID: 3131167
basement

Age: to Permian (252.17 - 2500 Ma)

Description: medium grade metamorphic

Lithology: 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



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References

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Guastoni, A. (2012) LCT (lithium, cesium, tantalum) and NYF (niobium, yttrium, fluorine) pegmatites in the Central Alps. Proxies of exhumation history of the Alpine nappe stack in the Lepontine Dome. Ph.D. Thesis. University of Padova, Dept. of Geosciences, 159 pp.
Guastoni, A., Pennacchioni, G., Pozzi, G., Fioretti, A. M., Walters, J.M. (2014) Tertiary pegmatite dikes of the Central Alps. The Canadian Mineralogist, 52, 2, 191-219.

 
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