File:Syenite (Cuttingsville Complex, mid-Cretaceous, 97 Ma; near Cuttingsville, Vermont, USA) 2.jpg
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[edit]DescriptionSyenite (Cuttingsville Complex, mid-Cretaceous, 97 Ma; near Cuttingsville, Vermont, USA) 2.jpg |
English: Syenite (hornblende syenite) from the Cretaceous of Vermont, USA.
Igneous rocks form by the cooling and crystallization of hot, molten rock (magma and lava). If this happens at or near the land surface, or on the seafloor, they are extrusive igneous rocks. If this happens deep underground, they are intrusive igneous rocks. Most igneous rocks have a crystalline texture, but some are clastic, vesicular, frothy, or glassy. Syenite is an intrusive igneous rock. It is similar to granite and gabbro in that is has phaneritic texture, with all or almost all crystals between 1 millimeter and 1 centimeter in size each. Phaneritic texture forms as a result of relatively slow cooling of magma deep underground. Syenite has a chemical composition between that of granite's felsic chemistry and gabbro's mafic chemistry. Syenite is an example of an intermediate igneous rock, which has 52 to 65% silica (= SiO2 chemistry) (intermediate has also been defined as 55 to 65% silica). Intermediate igneous rocks are sometimes light-colored, sometimes dark-colored, and sometimes have medium colors. The mineral content of syenite is dominated by feldspar with little to no quartz. Syenite is defined as alkali feldspar-rich, with little to no plagioclase feldspar. The minor plagioclase feldspar component is often intergrown with the alkali feldspar to form perthite. In the syenite seen here, the whitish-gray component is perthitic alkali feldspar. The black crystals are hornblende amphibole and biotite mica. Minor minerals in this material include pyrite, magnetite, titanite/sphene, apatite, and zircon. Geologic unit: Cuttingsville Complex, mid-Cretaceous, 97 Ma Locality: unrecorded locality near Cuttingsville, southern Vermont, USA (but likely from an old quarry at Granite Hill, in the southwestern part of the Cuttingsville Complex, ~1.5 to 1.7 km southwest of the town of Cuttingsville) Some info. synthesized from: Eby & McHone (1997) - Plutonic and hypabyssal intrusion of the Early Cretaceous Cuttingsville Complex, Vermont. in: Guidebook to field trips in Vermont and adjacent New Hampshire and New York. New England Intercollegiate Geological Conference, 89th Annual Meeting, 1997: B2-1 to B2-17. Eggleston (1918) - Eruptive rocks at Cuttingsville, Vermont. American Journal of Science 45: 377-410. |
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Source | https://www.flickr.com/photos/47445767@N05/51616122631/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51616122631. It was reviewed on 19 June 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
19 June 2022
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current | 08:20, 19 June 2022 | ![]() | 2,977 × 2,794 (4.42 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51616122631/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 13:43, 21 October 2021 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 20:36, 21 October 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:43, 21 October 2021 |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
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Focal plane resolution unit | inches |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 16:36, 21 October 2021 |
Unique ID of original document | A926689E18E5099386C347B04A14B14F |