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Physical Geology / Non lab

by: Staranna Taylor

Physical Geology / Non lab Geo-1200-090

Marketplace > Geology > Geo-1200-090 > Physical Geology Non lab
Staranna Taylor


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About this Document

These notes discuss the different classifications of igneous rocks. The many different types and how to understand Bowen's reactions.
Physical Geology
McLean Rufus
Class Notes
Geology, rocks, Physical Geology
25 ?




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This 4 page Class Notes was uploaded by Staranna Taylor on Tuesday February 9, 2016. The Class Notes belongs to Geo-1200-090 at a university taught by McLean Rufus in Spring 2016. Since its upload, it has received 7 views.


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Date Created: 02/09/16
Wednesday, February 10, y Geology  Igneous Rocks Three types of Igneous Rocks 1. Extrusive Rocks­ Come out of lava­  Ex: Basalt, RhyoLite, Obsidian. 2. Intrusive Rocks ( Plutonic)­ such as granite, never made to the surface. Ex: Granite, Diorite, Gabbro. 3. Pyroclastic Rocks­ ash, pumice ( Pyro)­ meaning  fire. Ex: Ash, Pumice, Tuff,  Volcanic Breccia. Example of these Three  igneous rocks. During this magma there  is a gas, liquid and solid  faze.  Igneous Rocks are classified during two things. •  Textures: 1 Wednesday, February 10, y •   Aphanitic­ Microscopic to barely visible with eye or had lens.  •  Phaneriti : Coarse grained visible up to 2.5 cm ( inch).  •  Popphyriti : Large in fine ground mass.  • Ex: Large crystals. •  Porphyriti  Ground mass , large crystals called Phenocrysts­ which means the result of slow  cooling.   •  Vesicula : Gas bubbles. • Ex: Pumice, sometime Basalt.  • Get a glassy texture from the fracturing of the obsidian.  •  Pegmatiti : Texture: Very Large, Contains Beryllium < 2.5 cm up to 2 meters or even bigger. Ex: Get minerals and sapphires and Rubies, famous for gemstones.  Another way to classify Rocks is by  Chemical Composition ! Felsic Rocks Intermediate Mafic Ultramafic  Pink to light Grey Salt and Pepper color “  Black Dark Green to Black White and Black” Granite Andesite  Besalt Komatite  Felsic Rock:  Extrusive ( Rhyolite), Intrusive ( Granite) Mantle is Intrusive Rock. 2 Wednesday, February 10, y •  Igneous Rocks are composed primarily of Silicate minerals.  • Pumice can be so light with gas bubbles it can float on water, have  volcanic eruption in a  ocean is an example.  • Andesite Porphyry : found in mountain ranges. • Diorite: Salt and pepper look • Basalt­ Look up on slideshow on Moodle • • Decompression Melting: The rock decompresses.Partial melting begins, mantle rock starts to rise then Basaltic Magma rises to generate new oceanic crust, rising and then begins to melt.  ­  The liquid portion that melts goes to the top of the magma chamber and separates form the  body of material at the bottom. The lower temperature that is melted will rise to the surface  and leave the other material behind this is known as partial melting. ­ Role of Heat­ Temperature increases as you go within the Earths upper crust ( known as the  Geothermal Gradient­ average between 20 degrees and 30 degrees celsius per kilometer.  ­ Roles of Volatiles­ are (primarily water) causing rocks to melt at lower temperatures. 3 Wednesday, February 10, y Bowen's Reaction Series­ The order of crystal formation form the  magma as cooling occurs. ­  He discovered that what he started with was completely different from what he saw next in  his reaction and how it kept changing in other words discontinuous reactions were occurring.  ­ OPAB ( Old People Are Boring) Acronym for remembering the order for the discontinuous  reaction of Bowen’s reaction. ­  Magma Differentiation  ­  partial melting separate of magma into a fraction.   4


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