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Table 5 Shared features between Madagascar geothermal areas and global analogues
Region | North | Central | West | |||
|---|---|---|---|---|---|---|
Area | Ambilobe | Ambanja | Itasy | Antsirabe | Miandrivazo | Morondava |
Age of volcanism | Miocene | Miocene–Pleistocene | Mesozoic | |||
Heat source | Shallow Moho | Shallow Moho and fossil magma chamber | Shallow Moho | |||
Lithology | Sedimentary sequences, magmatic to metamorphic basement | Volcanic rocks and deposits, magmatic to metamorphic basement | Neogene deposits, volcanic rocks, magmatic to metamorphic basement | Mesozoic and Permian sedimentary sequences, magmatic to metamorphic basement | ||
Structural setting or regime | Normal faulting Dextral/sinistral strike-slip faults | Graben | Pull-apart basin | Half-graben | Normal faulting | Horst-graben structure in passive margin basin |
Dominant geologic control | Quaternary faulting | Miocene-quaternary active faulting | Faults/fractures | |||
Analogue | Walker Lane, Great Basin, USA | Gediz Graben, Western Turkey | Walker Lane, Great Basin, USA | Main Karoo Basin, South Africa | ||