stripes
Occurrence number:
171-00-006
Country:
Ukraine
Location:
Longitude: 32, Latitude: 49.33
Carbonatite:
No
This sill of metamorphosed lamproite is located in the junction zone of the Ukrainian crystalline shield and the Dnieper-Donetz basin and is related to a deep, north-south-trending fault (lineament) and the peripheral ring fracture of the circular Kirovograd structure. The rock extends over some hundreds of square metres and is a microporphyritic phlogopite-amphibole-pseudoleucite lamproite. The mineralogy is microcline, K-arfvedsonitic and pargasitic amphibole and phlogopite with accessory rutile, Mn-ilmenite (5.3-10% MnO), apatite, titanite and magnetite.
Age:
A K-Ar determination gave an age of 1370 Ma (Geiko et al., 1991).
References:
GEIKO, Yu.V., ORLOVA, M.P. and FILONENKO, V.P. 1991. Pseudoleucitic lamproites of the Ukraine. Transactions of the All-Union Mineralogical Society, 5: 52-6.
Location: