Kakortokite (eudialytic nepheline syenite) (Ilímaussaq Intrusion, Mesoproterozoic, 1.16 Ga; Kangerdluarssaq Fjord, Greenland) 9

            Kakortokite from the Precambrian of Greenland.

Kakortokite is a rare intrusive igneous rock.  The name traditionally applies to eudialytic nepheline syenites found in southern Greenland.  The most conspicuous minerals in this sample are reddish eudialyte (Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2) and black-colored arfvedsonite amphibole (NaNa2((Fe+2)4Fe+3)Si8O22(OH)2).  The light-colored material is a mix of nepheline, alkali feldspar, and sodalite.  Sodalite is often bluish-colored, but not in this specimen.  The sodalite component glow orangish under black light (ultraviolet light).
 
Geologic unit: Ilímaussaq Intrusion (Ilímaussaq Complex; Ilímaussaq Alkaline Complex), an 8 x 17 kilometer-sized intrusion in the 1.12-1.35 billion year old Gardar Igneous Province, developed in a failed rift zone.

Age: late Mesoproterozoic, 1.16 Ga

Locality: eastern end of Kangerdluarssaq Fjord (also spelled Kangerdluarsuk Fjord), far-southern Greenland

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Taken on: July 22, 2024

Tags:

kakortokite

eudialytic

syenite

eudialyte

arfvedsonite

amphibole

Greenland

Ilimaussaq

Alkaline

Complex

Intrusion

Kangerdluarssaq

Fjord

Precambrian

Proterozoic

Mesoproterozoic

Kangerdluarsuk

sodalite

alkali

feldspar « less

Sets appears in: • Syenite & Syenitic Rocks • Greenland Rocks more » • Mesoproterozoic Rocks, Minerals, Fossils • Nepheline Syenite • Kakortokite (eudialytic nepheline syenite) « less

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