File:Gneis Ollo de sapo.006 - Geolodía Monfero 2024.jpg
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Gneis ''Ollo de sapo''.
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[edit]DescriptionGneis Ollo de sapo.006 - Geolodía Monfero 2024.jpg |
Español: Gneis de la formación Ollo de Sapo. Esta es una roca metamórfica de origen magmática (es dicir, un ortogneis). En el caso de la imagen, se formó a partir de materiales ácidos expulsados por un conjunto de volcanes submarinos (de hace 475 millones de años) que se extendieron desde el norte de Galicia hasta la Sierra de Guadarrama. El nombre era conocido por los habitantes de la zona, y fue citado por Hernández Sampelayo en 1922. Isidro Parga Pondal indicó en 1964 que el nombre era debido a los porfiroclastos (cristales) azulados de cuarzo comunes en los porfiroides de bajo grado (una de las facies de la formación); también incluye grandes porfiroblastos de feldespato, que debido a su tamaño, a veces sobresalen de la matriz debido a la erosión de esta.
Foto realizada durante el Geolodía 2024 en Rego de Frai Bermuz, Monfero (A Coruña, Galicia, España).
Galego: Gneis da formación Ollo de Sapo. Esta é unha rocha metamórfica de orixe magmática (é dicir, un ortogneis). No caso da imaxe, formouse a partir de materiais ácidos expulsados por un conxunto de volcáns submariños (de hai 475 millóns de anos) que se extenderon desde o norte de Galicia ata a Serra de Guadarrama. O nome era coñecido polos habitantes da zona, e foi citado por Hernández Sampelayo en 1922. Isidro Parga Pondal indicou en 1964 que o nome era debido aos porfiroclastos (cristais) azulados de cuarzo comúns nos porfiroides de baixo grao (unha das facies da formación); tamén inclúe grandes porfiroblastos de feldespato, que debido ao seu tamaño, ás veces sobresaen da matriz debido á erosión de esta.
Foto realizada durante o Xeolodía 2024 en Rego de Frai Bermuz, Monfero (A Coruña, Galicia, España). |
Date | |
Source | Own work |
Author | Fernando Losada Rodríguez |
Camera location | 43° 18′ 38.95″ N, 7° 56′ 55.17″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:38, 18 May 2024 | ![]() | 6,000 × 4,000 (12.97 MB) | Drow male (talk | contribs) | Uploaded own work with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon EOS 850D |
Author | |
Copyright holder | |
Exposure time | 1/250 sec (0.004) |
F-number | f/4 |
ISO speed rating | 250 |
Date and time of data generation | 17:08, 11 May 2024 |
Lens focal length | 70 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
File change date and time | 17:08, 11 May 2024 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.31 |
Date and time of digitizing | 17:08, 11 May 2024 |
Meaning of each component |
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APEX shutter speed | 8 |
APEX aperture | 4 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire |
DateTime subseconds | 28 |
DateTimeOriginal subseconds | 28 |
DateTimeDigitized subseconds | 28 |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 6,825.9385665529 |
Focal plane Y resolution | 6,825.9385665529 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
GPS tag version | 0.0.3.2 |
Rating (out of 5) | 0 |