Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.
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Transcript of Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.
![Page 1: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/1.jpg)
Igneous rocks
Geology of National Parks and Monuments
Prof. Kurt Friehauf
![Page 2: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/2.jpg)
Basalt• Mafic• Fine-grained• Black• May have
bubble holes like Swiss cheese
• Volcanic
![Page 3: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/3.jpg)
Obsidian• Volcanic glass• Smooth with
sharp edges• Forms by quick
cooling• Can be mafic or
felsic• Volcanic
![Page 4: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/4.jpg)
Pumice• Froth of volcanic
glass• Light weight
commonly floatsin water
• Rough surface• Forms as foam
when lava slops around
• Volcanic
![Page 5: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/5.jpg)
Scoria• Mafic• Red color due to
oxidation of iron in mafic lava
• Rough, commonly bubbly
• Volcanic
![Page 6: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/6.jpg)
Rhyolite• Felsic• Fine-grained• Pink/tan/white
color• May contain
pumice fragments
• Volcanic
![Page 7: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/7.jpg)
Andesite Tuff
• Intermediate• Fine-grained with
chunks of other rocks
• Green/gray• Forms by
explosive eruption
• Volcanic
![Page 8: Igneous rocks Geology of National Parks and Monuments Prof. Kurt Friehauf.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649dc85503460f94abdcb3/html5/thumbnails/8.jpg)
Granite• Felsic• Coarse-grained
can see crystals• Pink/tan/white
with dark specks• Plutonic (forms
deep within earth, not volcanic)