Page 70 - Volcanic Textures A Guide To The Interpretation of Textures In Volcanic Rocks

environment would retain volatiles due to the high mobility than subaerial flows of equivalent
confining pressure imposed by the water column and, in compositions.
consequence, might have lower viscosity and greater
LAVA FLOWS

SECTIONS

LAVA DOMES

Fig. 26 Character and arrangement of contemporaneous volcanic facies that develop in association with the
emplacement of submarine lava flows (top) and domes (bottom). On each volcanic facies diagram, (1), (2), (3) mark
the sites of sections depicted by graphic logs in the centre diagram. Each section samples genetically related facies
that differ markedly in character, texture and internal organization. Coherent lava in one section may be the direct
correlate of bedded volcaniclastic breccia in an adjacent section.

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