Category:Igneous rocks

Category:Igneous rocks - Factbites
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Topic: Category:Igneous rocks

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	Earth 2nd Edition > Chapter 6 > Overview
		The igneous category is subdivided into two main branches: intrusive igneous rocks and extrusive igneous rocks.
		In the second, molten rock spills out on the surface as lava that produces rocks (including rhyolite, andesite, basalt, obsidian, pumice, and pyroclastic rocks), structures (volcanoes and lava flows), and some wild and exciting events, for “extrusive igneous activity” is synonymous with the word volcanics.
		Any study of igneous activity begins with a discussion of magma.
	www.wwnorton.com /college/geo/earth2/content/chapter_6/overview.htm

	Geology 1403 Lecture 6 Notes
		Know what Extrusive and Intrusive Igneous rocks are.
		Magma is extruded from a central vent or pipe.
		Recall that basaltic magmas rise to the surface at mid-ocean ridges and from new oceanic crust.
	ccollege.hccs.cc.tx.us /instru/PHYSCI/geo/cate/Lecture2000/Lecn6.htm

	Geology - What's Been Published - Alphabetically by Title Beginning: M
		Magmas and magmatic rocks : an introduction to igneous petrology
		Magma migration and resupply during the 1974 summit eruptions of Kilauea Volcano, Hawai i
		Magma production deuring granulite facies anatexis : data from " primitive" metasedimentary protoliths
	www.pitbossannie.com /ti-qe-m.html

	PIRSA Minerals - Mineral Resource Potential - Diamonds
		Both kimberlite and lamproite belong to a broader category of igneous rocks called lamprophyres.
		Diamonds are also found in placer deposits some distance from the eroded kimberlitic source rocks.
		The discovery of diamonds in lamproite, a related rock type, in Western Australia in 1979 has led to further exploration for lamproite-hosted deposits.
	www.pir.sa.gov.au /pages/minerals/commodity/diamond.htm:sectID=245&tempID=7 (956 words)

	Gneiss
		Gneisses are typically associated with major mountain building events when shales or clay rich sandstones (wackes), or felsic igneous rocks (e.g.
		This specimen is not far removed from a schist seen closeup (for example), but the megascopic banding here puts it in the gneiss category.
		In gneisses the mafic minerals (biotite and amphibole) and light minerals (quartz and feldspar) have separated into separate bands.
	csmres.jmu.edu /geollab/Fichter/MetaRx/Rocks/gneiss1.html (170 words)

	Base.doc
		Unlike the PCD's, in which the ore occurs either disseminated or in veins in the igneous intrusion and the country rocks, base metal lodes (BML) are concentrated in the country rock, and are not as disseminated.
		Their spatial distribution relative to PCD's as well as data from fluid inclusions seem to suggest that they form at T ~ 250 - 350°C, placing them in the category of "mesothermal" deposits of Lindgren.
		General characteristics of Mesothermal deposits: 1- Unlike hypothermal deposits which are characterized by replacement type textures, mesothermal deposits tend to have both replacement and open space filling textures, with the latter more common in shallower deposits.
	www.science.marshall.edu /elshazly/Econ/Base.doc (170 words)

	Enstatite Information and Resources from Very Famous Gems
		The pyroxene silicate minerals enstatite (MgSiO3) and ferrosilite (FeSiO3) form a complete solid solution series and are common rock-forming minerals found in igneous and metamorphic rocks and meteorites.
		Enstatite - Ferrosilite General Category Mineral Chemical formula (Mg,Fe)SiO3 Identification Colour Mg end member: colourless, grey, green, yellow or brown.
		The intermediate composition, (Mg,Fe)SiO3, is sometimes known as hypersthene although this name has been formally abandoned and replaced by enstatite or ferrosilite.
	www.veryfamousgems.com /013/enstatite.asp (170 words)

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Topic: Category:Igneous rocks

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