File:Sandorite lamprophyre with xenoliths (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 12 (48342456782).jpg
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[edit]DescriptionSandorite lamprophyre with xenoliths (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 12 (48342456782).jpg |
Lamprophyre with xenoliths in the Precambrian of Ontario, Canada. This is part of an igneous dike composed of a rare igneous rock called lamprophyre. Such rocks are ultrapotassic, mafic to ultramafic, intrusive igneous rocks. This one is a diamondiferous spessartite lamprophyre called sandorite, with 47% silica and 5% black amphibole macrocrysts, up to 3 millimeters in size. The sandorite here has xenoliths ("xeno" = foreign; "lith" = rock), which are pieces of rock that have fallen from the walls or roof of a cooling magma chamber. At this site, they include mantle and crustal xenoliths. Spessartite lamprophyres are defined in the literature as lamprophyres having phenocrysts of hornblende amphibole or clinopyroxene in a groundmass of sodic plagioclase feldspar, with accessary olivine, biotite mica, apatite, and opaque oxide minerals. Sandorite dikes here represent the hypabyssal facies of a sandorite volcanic complex. The surrounding host rocks are 2.7 billion year old gabbros and volcanic tuffs of the Catfish Assemblage. Geologic unit and age: Sandor Dike, Neoarchean, 2.703 Ga (a zircon from a gneissic xenolith has been dated to 2.684 Ga) Locality: roadcut on the eastern side of Route 17, northeast of Wasp Lake & east of McCormick Lake, north of the town of Wawa, Ontario, southeastern Canada (48° 12’ 42.13" North latitude, 84° 50' 52.24" West longitude) See info. at: <a href="https://en.wikipedia.org/wiki/Lamprophyre" rel="noreferrer nofollow">en.wikipedia.org/wiki/Lamprophyre</a> and <a href="https://en.wikipedia.org/wiki/Xenolith" rel="noreferrer nofollow">en.wikipedia.org/wiki/Xenolith</a> |
Date | |
Source | Sandorite lamprophyre with xenoliths (Sandor Dike, Neoarchean, 2.703 Ga; Route 17 roadcut northeast of Wasp Lake & north of Wawa, Ontario, Canada) 12 |
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@N05/48342456782 (archive). It was reviewed on 9 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
9 October 2019
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current | 06:30, 9 October 2019 | 4,000 × 3,000 (10.74 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Date and time of data generation | 07:39, 13 July 2012 |
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Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 19:55, 21 July 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 07:39, 13 July 2012 |
Meaning of each component |
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Custom image processing | Normal process |
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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 | 15:55, 21 July 2019 |
Unique ID of original document | 07775FCC391D29854A5FE46BE77D7893 |