File:Kakortokite (eudialytic nepheline syenite) Kangerdluarssaq Fjord,Greenland.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(697 × 979 pixels, file size: 453 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary[edit]

Description

Kakortokite (cut surfaces; 9.5 cm 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 billion years.

Locality: cliff outcrops on southern side of eastern end of Kangerdluarssaq Fjord (also spelled Kangerdluarsuk Fjord), far-southern Greenland.
Date
Source Kakortokite (eudialytic nepheline syenite) (Ilimaussaq Intrusion, Mesoproterozoic, 1.16 Ga; Kangerdluarssaq Fjord, far-southern Greenland) 1
Author James St. John

Licensing[edit]

w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14979712946. It was reviewed on 23 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

23 August 2014

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current00:17, 23 August 2014Thumbnail for version as of 00:17, 23 August 2014697 × 979 (453 KB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

You cannot overwrite this file.

There are no pages that use this file.

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Kakortokite_(eudialytic_nepheline_syenite)_Kangerdluarssaq_Fjord,Greenland.jpg&oldid=865414283"