stripes
Occurrence number:
068-00-001
Country:
Guyana
Location:
Longitude: -59.83, Latitude: 7.67
Carbonatite:
No
The Kaituma intrusion of peralkaline quartz syenite covers about 70 km2 and appears to grade westwards into biotite granite. It comprises microcline perthite, albite-oligoclase, quartz, aegirine, arfvedsonite, biotite and accessory sphene, orthite, magnetite and apatite. Pegmatites which cut the intrusion have high radioactivity owing to the presence of euxenite, samarskite, uranothorite and titanian betafite.
Age:
2065±100 Ma was obtained on aegirine-augite by K-Ar (Snelling and McConnell, 1969, Table 3).
References:
ALLEN, P.M. 1964. The younger granite group of British Guiana. Report of 22nd Session, International Geological Congress, India, 10: 539-52.
SNELLING, N.J. and MCCONNELL, R.B. 1969. The geochronology of Guyana. Records, Geological Survey of Guyana, 6: XI, 1-26
Location: