The Central Indian Ridge is mantled with flows of low-potassium basalt of uniform composition. Gabbro, anorthosite, and garnet-bearing lherzolite are exposed in cross fractures, and lherzolite is the bedrock at the center of the ridge. The lherzolites are upper-mantle rock exposed by faulting.
Additional publication details
Lherzolite, anorthosite, gabbro, and basalt dredged from the Mid-Indian Ocean Ridge