File:Kakortokite (eudialytic nepheline syenite) (Ilímaussaq Intrusion, Mesoproterozoic, 1.16 Ga; Kangerdluarssaq Fjord, Greenland) 2.jpg
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Summary
| Description |
English: Kakortokite (cut surface; 9.5 centimeters tall) - magmatically layered kakortokite from Greenland’s Precambrian-aged Ilímaussaq Complex.
White = nepheline Black = arfvedsonite amphibole Red = eudialyte Kakortokite is a rare intrusive igneous rock. The name is traditionally applied to eudialytic nepheline syenites found in southern Greenland. The attractive sample shown here principally contains three minerals: whitish nepheline ((Na,K)AlSiO4), blackish arfvedsonite amphibole (NaNa2((Fe+2)4Fe+3)Si8O22(OH)2), and reddish eudialyte (Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2). Notice that the amphibole and the eudialyte show layering. Magmatic layering is expected to occur in the lower portions of old magma chambers, and this kakortokite sample is indeed from the floor rocks of an old igneous intrusion. Geologic unit: Ilímaussaq Intrusion (Ilímaussaq Complex; Ilímaussaq Alkaline Complex), an 8 x 17 km intrusion in the 1.12-1.35 b.y. Gardar Igneous Province, developed in a failed rift zone. Age: late Mesoproterozoic, 1.16 Ga Locality: cliff outcrops on southern side of eastern end of Kangerdluarssaq Fjord (also spelled Kangerdluarsuk Fjord), far-southern Greenland |
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| Source | https://www.flickr.com/photos/47445767@N05/14999616221/ |
| 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@N05/14999616221. 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. |
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| current | 08:19, 19 June 2022 | | 678 × 979 (644 KB) | Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14999616221/ with UploadWizard |
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