Page 24 - Volcanic Textures A Guide To The Interpretation of Textures In Volcanic Rocks

Fig. 9 Recommended composition and texture symbols for graphic logging of volcanic deposits.

Deep submarine volcanic sequences contain deposits hyaloclastite and peperite, and can develop pillowed and
from both intrabasinal and extrabasinal (subaerial) or lobate forms. Most clastic deposits, both volcaniclastic
basin-margin (shallow marine) eruptive centers, and are and non-volcanic, are emplaced by water-supported
normally mixtures of volcanic and non-volcanic mass flows and by fallout from suspension in the water
deposits. They include the products of both effusive and column. Water-supported mass flows are a particularly
explosive eruptions. Syn-volcanic sills, dykes and important means by which subaerially and shallow
cryptodomes may be just as common as lava flows. subaqueously erupted pyroclasts are transported to deep
Intrusions and lava flows are associated with submarine depositional settings, and by which
12