Tatui
Dykes exposed in a railway cutting south of Tatui are shonkinites similar to those of Piedade (025-00-097).
Dykes exposed in a railway cutting south of Tatui are shonkinites similar to those of Piedade (025-00-097).
Juquia is an asymmetric, zoned intrusion of 14 km2 intruded into Precambrian gneisses of the Acungui Group, which are fenitized in places.
This is a body of about 4.5 km2 elongated northwest-southeast and intruded into Precambrian granites of the Tres Corregos complex.
This carbonatite intrusion is situated only 2.3 km southeast of Itapirapua (025-00-103) and forms a plug over 500 m high surrounded by precipitous cliffs; it is about 2 km2.
The complex of Jacupiranga is an oval-shaped intrusion of 65 km2 emplaced in mica schists and granodiorites of the Precambrian Acungui Group, which are fenitized and nephelinized in places.
A stock of less than 1 km2 forms the hill of Sao Joao and is surrounded by Recent sediments which obscure the contacts. The principal rocks are biotite pulaskite and nordmarkite, the latter containing quartz; both rock types include amphibole and a diopsidic pyroxene.
The small intrusion of Jaboticabal is emplaced in Cretaceous basalts. To the west and northwest near Aparecida de Monte Alto, Taiuva and Piranji alkaline lavas up to 15 m thick intercalated in sandstones of the Bauru Group have been encountered in drill holes.