stripes
Occurrence number:
121-00-012
Country:
Niger
Region:
Timia
Location:
Longitude: 8.7, Latitude: 18.17
Carbonatite:
No
This is a circular intrusion 15 km in diameter composed of a central biotite granite around which is a coarse-grained amphibole-biotite granite. The latter rock consists of perthite, quartz, sometimes in micrographic intergrowth, ferrohastingsite and/or riebeckite, biotite and accessory fluorite, magnetite and zircon.
Age:
A Rb-Sr whole-rock isochron gave 435±8 Ma (Karche and Vachette, 1978).
References:
BLACK, R., JAUJOU, M. and PELLATON, C. 1967. Notice explicative sur la carte geologique de l'Air à l'échelle du 1/500 000. Direction des Mines et de la Geologie. Republique du Niger, 1-57.KARCHE, J.-P. and VACHETTE, M. 1978. Age et migration de l'activité magmatique dans les complexes paléozoïques du Niger. Consequences. Bulletin de la Société Géologique de France, 20: 941-53.
Location: