ESCI 2010 Lecture Notes - Lecture 16: Pillow Lava, Igneous Rock, Magma Chamber
14 Mar 2016
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Document Summary
Occurrence in main earthquake belts: high heat flow, nature of igneous activity, heat moves relatively easily to the surface, intrusive igneous activity vs. extrusive igneous activity (volcanoes) Gases: mainly steam, in terms of volume, the most important one is steam, co2 and gaseous form of sulfur are toxic o. Related to explosive and violent escape as gas: pahoehoe (ropy lava) Large content of gas that remains mostly in lava. Gas escapes in tranquil matter from lava flow. Because upper surface of lava flow takes on an appearance of a series of ropes so that the ropes are extended at right angles to main flow direction, that: pillow lava. Leading edge of a lava flow is cooled by sea water. Cooling results in the formation of a skin. Skin breaks eventually and lava moves on downslope. Takes on appearance of a jumbled mass of pillows: there is a common association between gaseous content and the form a lava flow takes.
