File:Pic Géant - Gra Fajol - filons quartz.jpg
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Summary
[edit]DescriptionPic Géant - Gra Fajol - filons quartz.jpg |
English: These mountains are located on the southern margin of the vast Canigó-Carança massif, on the France-Spain frontier, above the Vallter 2000 ski station. Here, the main geological formation is composed of orthogneiss, or metagranite. This formation is derived from the granite of a deep igneous intrusion which, around 470 million years ago, in the Ordovician period, was intruded into sedimentary formations of Cambrian and older ages. During the Hercynian orogeny, around 300 million years ago, the granite was metamorphosed into gneiss. It has since been uplifted by tectonic forces and exposed at the surface by erosion.
A particular geological feature of this sector of the massif is the existence of a number of "giant quartz veins" that cut through the gneiss in a west-east direction. These quartz veins are the largest of their kind in the Pyrenees. See:
B. Laumonier et al., Notice explicative de la feuille Prats-de-Mollo-La-preste (1099) à 1/50 000; http://ficheinfoterre.brgm.fr/Notices/1099N.pdf. |
Date | |
Source | Own work |
Author | Alan Mattingly |
Camera location | 42° 26′ 16.43″ N, 2° 15′ 37.17″ E | View this and other nearby images on: OpenStreetMap | 42.437898; 2.260325 |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:56, 11 September 2023 | 4,144 × 3,093 (9 MB) | Alan Mattingly (talk | contribs) | Uploaded own work with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | PhotoFiltre 7 |
File change date and time | 13:19, 11 September 2023 |
Exif version | 2.1 |