GEOL 212 Lecture Notes - Lecture 44: Siberian Traps, Paleogene, Central Atlantic Magmatic Province
26 Dec 2017
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Mazama about 6000 years ago: note: it is a resurgent caldera - i. e volcanic activity has returned to it, valles caldera in jemez mts. of nm encompasses over. Is large enough that it is difficult to visualize on the ground either from the outside or the inside. Active lava tube from usgs: lava tubes: Tubes formed when an active lava flow skins over then the liquid lava flows out, leaving the hardened outer surface roofing a tube. Effusive eruptions: these produce low-viscosity (i. e. highly liquid) basaltic lava. Arenal volcano from smithsonian institution: central vent eruptions: arenal in costa rica. Fissure eruption at puu o"o, hi: fissure eruption: Copious amounts of basaltic lava erupting through a fissure rather than a point source. Columbia river flood basalts, or from iavcei 2017: flood basalts: Very large fissure eruptions that transform landscape on map scale, building up a thick plain or plateau of basalt. Columbia plateau flood basalts (right see map), deccan traps.
