logging in or signing up Igneous Rocks kcollazo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 6995 Category: Education License: All Rights Reserved Like it (3) Dislike it (3) Added: April 02, 2009 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Igneous Rocks : Igneous Rocks Igneous Rocks : Igneous Rocks A rock is a group of minerals bound together. The three types of rocks are igneous, sedimentary, and metamorphic. Igneous Rocks : Igneous Rocks Igneous rocks form when magma cools and hardens. Photo used with permission from Mike Jarvis, Naperville Central HS, Naperville, IL Igneous from the Latin meaning “Fire formed”, is a rock type that forms from the solidification of a molten mineral solution. Slide 4: All igneous rocks have a random fabric of fused mineral grains. Igneous Rocks : Igneous Rocks Intrusive (Plutonic) rocks form inside the Earth (underground) when magma cools slowly to create large crystals. (Intrusive = Inside) Extrusive (Volcanic) rocks form on the Earth’s surface (above ground) when lava cools quickly to create small crystals. (Extrusive = Exit/outside) Intrusive: Large crystals : Intrusive: Large crystals Extrusive: Small crystals Which is which? How do you know? Igneous Rocks : Igneous Rocks There are two types of magma Felsic = Light color, high in silica, viscous (thick and slow), low in iron, calcium or magnesium Felsic = Feldspar + Silica Mafic = Dark color, low in silica, not viscous (thin and watery), high in iron, calcium and magnesium Mafic = Magnesium + Iron (Fe) Felsic: Light overall color : Felsic: Light overall color Mafic: Dark overall color Which is which? How do you know? Igneous Rocks : Igneous Rocks Texture refers to the crystal size. Textures are divided into two main types: Fine-grained = crystals are too small to see (basalt) Coarse-grained = crystals are easily visible (granite) Coarse Grained: Large crystals : Coarse Grained: Large crystals Fine Grained: Small crystals Which is which? How do you know? Igneous Rocks : Igneous Rocks Other types of textures: A glassy texture occurs when rock freezes instantly. There are no crystals (obsidian). A porphyritic texture is a rock with large crystals surrounded by fine-grained crystals (ryolite). A vesicular texture is a rock that has many holes in it (pumice). Slide 12: Volcanic Glass/Obsidian: may be felsic, but is usually mafic. Even when felsic it appears dark nonetheless because the small % of mafic minerals in the rock form a homogenous solution with the felsic minerals tinting the overall color to dark. Notice the conchoidal fracture. Glassy Texture: Porphyritic Texture: : Porphyritic Texture: Rhyolite: Light colored (felsic), fine grained (volcanic) igneous rock Pumice: Fine grained, felsic, vesicular volcanic igneous rock. : Pumice: Fine grained, felsic, vesicular volcanic igneous rock. Scoria: Fine grained, mafic, vesicular volcanic igneous rock. Vesicular Texture: Igneous Rocks : Igneous Rocks Rocks can be grouped into families: Granite family = felsic, light, contains quartz, feldspar, & muscovite. (granite, rhyolite, obsidian, pumice) Gabbro family = mafic, dark, contains feldspar, olivine, biotite. (gabbro, basalt, scoria) Diorite family = intermediate composition and color. (diorite, andesite, obsidian) Igneous Rocks : Igneous Rocks Let’s try some examples, tell me if the following rock samples are: 1. Felsic or Mafic 2. Fine grained or Coarse grained 3. Intrusive or Extrusive Be sure to tell me how you knew. Basalt : Basalt Mafic = Dark color Fine grained= Small crystals Extrusive = Small crystals = Formed on surface Diorite : Diorite Felsic = Light color Coarse grained= Large crystals Intrusive = Large crystals = Formed underground Gabbro : Gabbro Mafic = Dark color Coarse grained= Large crystals Intrusive = Large crystals = formed underground Pumice : Pumice Felsic = Light color Fine grained= Small crystals Extrusive = Small crystals = Formed above ground Scoria : Scoria Mafic = Dark color Fine grained= Small crystals Extrusive = Small crystals = Formed above ground Slide 22: Remember: Safety First!!! Intermission You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Igneous Rocks kcollazo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 6995 Category: Education License: All Rights Reserved Like it (3) Dislike it (3) Added: April 02, 2009 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Igneous Rocks : Igneous Rocks Igneous Rocks : Igneous Rocks A rock is a group of minerals bound together. The three types of rocks are igneous, sedimentary, and metamorphic. Igneous Rocks : Igneous Rocks Igneous rocks form when magma cools and hardens. Photo used with permission from Mike Jarvis, Naperville Central HS, Naperville, IL Igneous from the Latin meaning “Fire formed”, is a rock type that forms from the solidification of a molten mineral solution. Slide 4: All igneous rocks have a random fabric of fused mineral grains. Igneous Rocks : Igneous Rocks Intrusive (Plutonic) rocks form inside the Earth (underground) when magma cools slowly to create large crystals. (Intrusive = Inside) Extrusive (Volcanic) rocks form on the Earth’s surface (above ground) when lava cools quickly to create small crystals. (Extrusive = Exit/outside) Intrusive: Large crystals : Intrusive: Large crystals Extrusive: Small crystals Which is which? How do you know? Igneous Rocks : Igneous Rocks There are two types of magma Felsic = Light color, high in silica, viscous (thick and slow), low in iron, calcium or magnesium Felsic = Feldspar + Silica Mafic = Dark color, low in silica, not viscous (thin and watery), high in iron, calcium and magnesium Mafic = Magnesium + Iron (Fe) Felsic: Light overall color : Felsic: Light overall color Mafic: Dark overall color Which is which? How do you know? Igneous Rocks : Igneous Rocks Texture refers to the crystal size. Textures are divided into two main types: Fine-grained = crystals are too small to see (basalt) Coarse-grained = crystals are easily visible (granite) Coarse Grained: Large crystals : Coarse Grained: Large crystals Fine Grained: Small crystals Which is which? How do you know? Igneous Rocks : Igneous Rocks Other types of textures: A glassy texture occurs when rock freezes instantly. There are no crystals (obsidian). A porphyritic texture is a rock with large crystals surrounded by fine-grained crystals (ryolite). A vesicular texture is a rock that has many holes in it (pumice). Slide 12: Volcanic Glass/Obsidian: may be felsic, but is usually mafic. Even when felsic it appears dark nonetheless because the small % of mafic minerals in the rock form a homogenous solution with the felsic minerals tinting the overall color to dark. Notice the conchoidal fracture. Glassy Texture: Porphyritic Texture: : Porphyritic Texture: Rhyolite: Light colored (felsic), fine grained (volcanic) igneous rock Pumice: Fine grained, felsic, vesicular volcanic igneous rock. : Pumice: Fine grained, felsic, vesicular volcanic igneous rock. Scoria: Fine grained, mafic, vesicular volcanic igneous rock. Vesicular Texture: Igneous Rocks : Igneous Rocks Rocks can be grouped into families: Granite family = felsic, light, contains quartz, feldspar, & muscovite. (granite, rhyolite, obsidian, pumice) Gabbro family = mafic, dark, contains feldspar, olivine, biotite. (gabbro, basalt, scoria) Diorite family = intermediate composition and color. (diorite, andesite, obsidian) Igneous Rocks : Igneous Rocks Let’s try some examples, tell me if the following rock samples are: 1. Felsic or Mafic 2. Fine grained or Coarse grained 3. Intrusive or Extrusive Be sure to tell me how you knew. Basalt : Basalt Mafic = Dark color Fine grained= Small crystals Extrusive = Small crystals = Formed on surface Diorite : Diorite Felsic = Light color Coarse grained= Large crystals Intrusive = Large crystals = Formed underground Gabbro : Gabbro Mafic = Dark color Coarse grained= Large crystals Intrusive = Large crystals = formed underground Pumice : Pumice Felsic = Light color Fine grained= Small crystals Extrusive = Small crystals = Formed above ground Scoria : Scoria Mafic = Dark color Fine grained= Small crystals Extrusive = Small crystals = Formed above ground Slide 22: Remember: Safety First!!! Intermission