Fig. 5.3 Photograph shows a fissure in the axial graben of the East Pacific Rise segment at
12°50
0 N, 2606 m depth. The fissure is about 1 m wide and more than 10 m deep. Fissures and
fractured crust are pathways for magma extrusion on the sea floor. (Copyright IFREMER,
Cyathem cruise 1982, Cyana dive Cy82-09.)
Fig. 5.4 Lau Basin showing a columnar dyke complex taken during the Starmer I cruise by the
submersible Nautile (from Lagabrielle et al. 1994). The dolerite dykes are located in the North
Fiji back-arc basin (Lau Basin), at the intersection of a triple-junction between two spreading
ridge segments and a fracture zone near 16°40
0 S–174°W. (Copyright IFREMER, Starmer I cruise
1989, Nautile dive PL07)
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5 Earth’s Mantle Melting and Volcanism
12°50
0 N, 2606 m depth. The fissure is about 1 m wide and more than 10 m deep. Fissures and
fractured crust are pathways for magma extrusion on the sea floor. (Copyright IFREMER,
Cyathem cruise 1982, Cyana dive Cy82-09.)
Fig. 5.4 Lau Basin showing a columnar dyke complex taken during the Starmer I cruise by the
submersible Nautile (from Lagabrielle et al. 1994). The dolerite dykes are located in the North
Fiji back-arc basin (Lau Basin), at the intersection of a triple-junction between two spreading
ridge segments and a fracture zone near 16°40
0 S–174°W. (Copyright IFREMER, Starmer I cruise
1989, Nautile dive PL07)
114
5 Earth’s Mantle Melting and Volcanism