stripes
Occurrence number:
136-01-005
Country:
Russia
Region:
Aldan
Location:
Longitude: 120.37, Latitude: 57.9
Carbonatite:
No
Olivine-diopside ultrabasic lamproites have been discovered in a massif of phlogopite pyroxenites. The lamproites are porphyritic rocks with large (1-2 cm) fresh olivines set in a medium-grained mesostasis of phlogopite admixed with a small amount of diopside. A gradual transition from the Khani lamproite to the intrusive phlogopite pyroxenites can be observed. Such transitions are accompanied by a reduction in the overall amount of olivine concomitant with an increase in the content of diopside.
Age:
K-Ar determinations on phlogopite from lamproite gave 1818±25 and 1870±25 Ma (Bogatikov et al., 1991).
References:
BOGATIKOV, O.A., RYABCHIKOV, I.D., KONONOVA, V.A. et al. 1991. Lamproite. Nauka, Moscow. 320 pp.
Location: