geol ch.9 - Lecture 9 Igneous Rocks and Volcanoes I....

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Lecture 9 – Igneous Rocks and Volcanoes I. Definitions a. Magma – molten rock (lava on surface) b. Igneous rocks form – magma solidifies as lava c. Igneous rocks are either felsic or mafic d. Igneous rocks are classified by: i. Site of emplacement (above/below surface) ii. Chemical makeup (mostly silica) II. Igneous Rock Types a. Extrusive or Volcanic i. Above surface b. Intrusive or Plutonic i. Below surface III. Extrusive a. Subaerial (open air) b. Submarine (on seafloor or underwater) c. Subglacial (beneath glaciers) IV. Magma Chemistry a. High – Felsic – Rhyolite b. Med – Intermediate – Andesite c. Low – Mafic – Basalt V. Volcanic Products a. Gases i. H2O, CO2, SO2, H2S, HCl, F ii. Major contributions to Earth’s atmosphere b. Solids i. Airborne – tephra or pyroclastics ii. On surface – lava and pyroclastic flow VI. Volcano Classification a. Vent shape i. Round/hole ii. Fissure/crack b. Chemical composition i. Silica content ii. Gas content VII. Type of Volcanoes
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This note was uploaded on 04/09/2008 for the course GEOL 1301 taught by Professor Karlsson during the Fall '07 term at Texas Tech.

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geol ch.9 - Lecture 9 Igneous Rocks and Volcanoes I....

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