Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Dedova

stripes

Occurrence number: 
136-13-016
Country: 
Russia
Region: 
Kuznetsk-Minusinsk
Location: 
Longitude: 88.58, Latitude: 54.92
Carbonatite: 
No

The Dedova alkaline massif, which forms a small mountain, cuts plagioclase porphyries of Lower Cambrian age. It is composed of leucocratic trachytic textured gabbro, theralite and nepheline syenite. The last forms two bodies the larger of which forms an elongate lens-like intrusion situated along the western boundary of the gabbro while the smaller is a dyke. Theralite lies between the nepheline syenite and gabbro. The nepheline syenite is a foyaite consisting of alkali feldspar, nepheline, titanaugite and accessory titanite, apatite and Ti-Fe oxides. The nepheline syenite of the dyke is an albitized ferrohastingsite-nepheline syenite in which a varied suite of accessory minerals has been found including yttrium-bearing garnet, lavenite, zircon, eudialyte, orthite, Fe-Ti oxide minerals and sulphides.

Age: 
K-Ar on nepheline from the nepheline syenite dyke gave 316±17 Ma (Andreeva, 1968; Osokin et al., 1974).
References: 

ANDREEVA, E.D. 1968. Alkaline magmatism of Kuznetsk Alatau. Nauka, Moscow. 169 pp.
OSOKIN, E.D., LAPIN, A.V., KAPUSTIN, Yu.L., POHVISNEVA, E.A. and ALTUHOV, E.N. 1974. Alkaline provinces of Asia. Siberian-Pacific group.In L.S. Borodin (ed) Principal provinces and formations of alkaline rocks. 91-166. Nauka, Moscow.

Map: 
Fig. 2_161. Dedova (after Andreeva, 1968, Fig. 2).
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith