Geob lect 2.docx

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Department
Geographical Biogeosciences
Course
GEOB 103
Professor
Carles Ferrer- Boix
Semester
Spring

Description
Geob 103, Lecture 2 01/14/2014 The formation of Magma & igneous rocks Rock ­▯ Liquid ­> Rock         (Melting)     (Solidification) Igneous processes involve melting rocks to form magma and solidification of this magma to form a new  rock.  Igneous products form more magma, crystallizes below surfaces or erupts as lava and other materials.  Igneous rocks can be formed Surfaces: called extrusion (synonym to volcanic rock) Lava Pyroclastic deposits (Philippines)   Belo surface Intrusive Cooling  Composition of rocks Cooling of molten material Each mineral in magma crystalizes at a particular temperature ­> crystallization temp. Magma: High content of Silica: a compost of silicon and oxygen.  Magma also has gas which is why some rocks are full of holes.  Lava has no gas Based on the content of silica we have 2 types of rocks Ultramafic: More iron less silicon Mafic: stands for magnesium and iron.  Between these two types are intermediate rocks Felsic: Feldspar and silicon. Not a fixed amount of silicon. A gradual transition betwee
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