Extension & Magmatism in Rifts

flood basalts

Gently dipping flood basalts in the Turkana Rift

normal fault

Large normal fault in the Turkana Rift

columnar jointed basaltic plug

Columnar jointed basaltic plug

tufa deposits

Tufa deposits, Lake Turkana; lavas dip toward rift in background

Turkana Raft

Turkana raft

tufa cone

Large tuff cone (1 km across)and lava flows, S end of Lake Turkana

folded lavas

Folded lavas from Teleki’s volcano

geyser

Geysers at Lake Bogoria

border fault lake malawi

Livingston Mountains Border Fault, Lake Malawi

strike-slip fault

Strike-slip fault surface near Lake Rukwa

mylonite

Mylonite from Livingstone Mountains Border Fault

cross-cutting dikes

Cross-cutting dikes (few m wide) in Precambrian Basement, East Greenland VRM

dense dike swarm

Dense dike swarm in Precambrian Basement (cliff is 500 m high), East Greenland VRM

greenland flexure zone

East Greenland Flexure Zone with dark lavas dipping seaward, fed by dikes cutting Precambrian Basement

volcanic rifted margin

Schematic cross-section of a Volcanic Rifted Margin (Karson, 2016)