Feeder_dyke_Pinheiras

This site records the intrusion of a 133Ma basaltic feeder dyke to the Serra Geral basalts into the basement of the Parana Basin. Here it causes melting of the granitic surroundings and intensive back-veining and hybridization. The area is over a 100 m wide and some of the basaltic dykes are more than 20m wide.

Basaltic dyke in contact with homogeneous granite (instead of the regional deformed granitic gneisses).	Granite dyke intruding basalt dyke (back veining) and including angular blocks of basalt.
Hybridized contact between basalt and granite.	Hybridized contact between basalt and granite.
Felsic dykes into wide basaltic dyke split into three tips.	Basaltic dyke into granite surroundings.
Tips of basalt dykes into granite being back-veined by the granite.	Detail.
Basalt dyke with blunt tips splitting into narrow intrusions into granite.	Back-veining of granite into basalt dyke.
Blunt dyke tip in granite or may be a broken up dyke in granite magma.	Irregular intrusions of basaltic dyke into felsic.
Relations at the margin of the basaltic dyke in contact with granite: narrow basaltic dyke blunt tip.	Relations at the margin of the basaltic dyke in contact with granite: block of basalt with blunt rectangular tips.
Mingling.	Mingling.
Mingling.	Felsic intrusion forming a blob inside a basaltic dyke.