CroninProjects.org/ Vince/ Course/ PhysGeol/ Igneous-Rox.html

Mount Hood in northern Oregon is an active stratovolcano just east of Portland, formed because of the subduction of the Juan de Fuca Plate under the North American Plate. Photo by Vince Cronin.

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Igneous Rock and Volcanoes

Reading

Read and study chapters 4 & 5

Notes and Handouts

Notes: IgRox-MainPoints.pdf (pdf file, ~163 KB)

Decision tree for identifying igneous rocks: http://croninprojects.org/Vince/PhysGeoLab/IgRox-Table-V4.pdf (pdf file, 210 KB)

Presentation file

CroninProjects.org/Vince/Course/PhysGeol/1405IgRox-Part1-words.pdf (2.8 MB)

CroninProjects.org/Vince/Course/PhysGeol/1405IgRox-Part2-words.pdf (9 MB)

Smart Figures

4.3 — Intrusive versus extrusive igneous rocks: https://goo.gl/wnDbqk

4.5 — Mineralogy of common igneous rocks: https://goo.gl/vST3z8

4.7 — Igneous rock textures: https://goo.gl/U00Ix8

4.13 — Classification of Igneous Rocks: https://goo.gl/WiyTul

4.14 — Rocks containinformation about the processes that produced them: https://goo.gl/z8XJ1i

4.26 — Partial melting: https://goo.gl/s5Vigs

4.27 — Formation of granitic magma: https://goo.gl/P4Bffs

4.28 — Intrusive igneous structures: https://goo.gl/3sS9U5

4.29 — Sill exposed in Sinbad country, Utah: https://goo.gl/4MZelh

4.30 — Dike exposed in the Spanish Peaks, Colorado: https://goo.gl/MJHkem

5.3 — Eruption column generated by viscous, silica-rich magma: https://goo.gl/Gd11FL

5.9 — Anatomy of a volcano: https://goo.gl/Nl9iNq

5.11 — Comparing scales of different types of volcanoes: https://goo.gl/VXEa4X

5.12 — A lava flow from Kilauea volcano advances toward the village of Pahoa, Hawaii, October 28, 2014: https://goo.gl/UHGrvC

5.13 — Cinder cones: https://goo.gl/hM5KVK

5.14 — Paricutin, a well-known cinder cone: https://goo.gl/PQuC6A

5.22 — Kilauea's summit caldera: https://goo.gl/OcQxed

5.24 — Formation of a Yellowstone-type caldera: https://goo.gl/6al3WM

5.28 — Volcanic neck: https://goo.gl/XSRxzc

5.30 — Earth's zones of volcanism: https://goo.gl/MoqLrr

5.31 — Subduction-produced Cascade-range volcanoes: https://goo.gl/4To5ak

5.32 — Global distribution of large basalt provinces: https://goo.gl/NFTuK7

Vocabulary to learn

Consult your textbook or lecture notes for definitions. Remember that the best general source of definitions in geology is the AGI Glossary of Geology.

alkali feldspar	andesite	anhedral	aphanitic	Archimedes Principle
average (mean)	basalt	batholith	biotite	Buoyant force
cinder	cinder cone	color index	compositional twins	country rock
decompression melting	density	devitrification	dike	diorite
dunite	euhedral	extrusive igneous rock	feldspathoid	felsic
felsic igneous rock	felsic minerals	flux	force	gabbro
glass	granite	groundmass	hornblende (an amphibole)	ignimbrite
intermediate igneous rock	intrude	intrusive igneous rock	K-spar (potassium feldspar)	laccolith
lava	mafic	mafic enclave	mafic igneous rock	mafic mineral
magma	mass	mean (average)	muscovite	neck
obsidian	olivine	partial melting	pegmatite	peridotite
phaneritic	phenocryst	pipe	plagioclase feldspar	pluton
porphyritic	porphyry	potassium feldspar (K-spar)	pumice	pyroclastic
pyroclastic breccia	pyroxene	pyroxenite	quartz	radial dike
rhyolite	ring dike	sample standard deviation	scoria	sheeted dike
shield volcano	sill	stock	stratovolcano	subhedral
tachylyte	tephra	texture	tuff	ultramafic rock
vesicles	vesicular	volcaniclastic	xenolith	--

Study Questions

Note that any of the vocabulary words listed above is "fair game" for a question on any quiz that includes this material.

Igneous rocks and volcanoes study questions: IgRox-Volc-Questions.html (web page)

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