stripes
Occurrence number:
175-00-003
Country:
Uruguay
Region:
Maldonado
Location:
Longitude: -55.25, Latitude: -34.78
Carbonatite:
No
Pan de Azucar is an upstanding plug which consists of a central nordmarkite 2 km in diameter, surrounded by a ring of syenite. A smaller 2 km diameter intrusion lies 1 km to the northwest. A geological sketch map is given by Bossi and Fernandez (1963, Fig. 3). The central nordmarkite consists of tabular orthoclase, albite, quartz and arfvedsonite. The syenites of the ring dyke are also arfvedsonite-bearing.
Age:
Cambrian (J. Bossi, personal communication, 1985).
References:
J. Bossi, personal communication, 1985.
BOSSI, J. and FERNANDEZ, A. 1963. Evidencias de diferenciacion magmatica hacia el final del Gondwana Uruguayo. Boletim da Universidade do Parana, Geologia, 9: 1-20
Location: