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Chapter 11 - Chapter 11 Flood Basalt and Igneous Provinces...

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Chapter 11 Flood Basalt and Igneous Provinces Definitions Large igneous province o By definition, large igneous provinces are voluminous emplacements of predominantly basaltic extrusive (and intrusive) rock whose origins lie in processes other than 'normal' seafloor spreading. origin and example Continental flood basalt o origin and example o These plateaus all have several features in common. o One is that basalt constitutes almost the entire rock suite. o A second is that the eruptions were mostly subaerial, with only local subaqueous conditions. o A third characteristic is that each plateau was apparently formed within a very short period of time, possibly less than 1 million years. o the only flood basalt to occur on land in historic time: the Laki eruption in Iceland of 1783-84. Laki, Iceland: 1783-84 approx. 14.7 km 3 poured like hot water o remember that Mt. St. Helens tossed out 1 km 3 of material. only flood basalt witnessed in historical time volatile rich: F and SO 2 – damage to crops, starvation Columbia River Plateau (USA) approx. 175,000 km 3 erupted from fissures
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