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hornblende

The Columbia Encyclopedia, Sixth Edition | 2008 | Copyright

hornblende see amphibole .

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"hornblende." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 9 Feb. 2010 <http://www.encyclopedia.com>.

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Related newspaper, magazine, and trade journal articles from HighBeam Research

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	Relationships between hornblende K-Ar ages, chemical composition and hydrogen... Magazine article from: Journal of the Geological Society Jappy, T G; Leake, B E; Fallick, A E September 1, 2001 700+ words ...below Ar closure temperature for hornblende, erratically reset the ages...shown by a negative correlation of hornblende 6D and age and a wide scatter of...some samples. Z is controlled by hornblende chemical composition. High Mg...
	[sup.40]Ar/[sup.39]Ar dates on hornblende, muscovite, and biotite from the Mica... Magazine article from: Canadian Journal of Earth Sciences Ghent, Edward Villeneuve, Michael January 1, 2006 700+ words ...Ar dates on muscovite, biotite, and hornblende from some of the same samples dated...de la muscovite, de la biotite et du hornblende, effectuees a partir de quelques echantillons...Ar dates on muscovite, biotite, and hornblende in an attempt to set further constraints...
	Studies in the area of mineral science reported from University of Tokyo. Newspaper article from: Mining & Minerals September 25, 2009 700+ words ...unusual R chondrite that includes abundant hornblende amphibole. LAP04840 shows a texture...13.5% orthopyroxene, 13.3% hornblende, 6.2% plagioclase, 6.0% Fe...scientists in Hongo, Japan report. "Hornblende replaces olivine and pyroxene in both...
	Studies from Indiana University in the area of mineralogy and petrology... Newspaper article from: Mining & Minerals September 12, 2008 700+ words ...common igneous minerals (especially hornblende) increase significantly with increasing...contents. For some minerals (e.g., hornblende and augite), REE partitioning can...melting, lower or mid to upper crustal hornblende-present basalt fractionation, and...
	A precise late neoproterozoic U-Pb zircon age for the syntectonic perelle... Magazine article from: Journal of the Geological Society Samson, Scott D; D'Lemos, Richard S January 1, 1999 700+ words ...older than ^sup 40^Ar/^sup 39^Ar hornblende dates for the pluton, consistent with...largely undeformed, zoned plagioclase and hornblende surrounded by quartz pools which display...recrystallized feldspar porphyroclasts and hornblende prisms wrapped by elongate aggregates...
	Pre-eruptional magmatic zircon, neogene alboran volcanic province, SE Spain Magazine article from: Journal of the Geological Society Zeck, H P; Whitehouse, M J July 1, 2002 700+ words Hornblende-biotite- (?)pyroxene dacite from...quartz, plagioclase, biotite and hornblende, major phenocryst phases, also show...of its magma. Cerro Morron de Mateo hornblende-biotite-(?)pyroxene dacite...
	How old is it? How do we know? A review of dating methods--Part Three:... Magazine article from: Perspectives on Science and Christian Faith Young, Davis A. June 1, 2007 700+ words ...and around 475[degrees]C for hornblende, it is possible to estimate the depths at which a given biotite- or hornblende-bearing rock attained these temperatures...kilometers. The K-Ar cooling age for hornblende will normally be older than the...
	Inception of a Devonian subduction zone along the southwestern Gondwana margin:... Magazine article from: Canadian Journal of Earth Sciences Kato, Terence T. Sharp, Warren D. Godoy, Estanislao March 1, 2008 700+ words ...boulders include omphacite, garnet, and hornblende that indicate eclogite-facies conditions...amphibole + epidote assemblages. Relict hornblende from an early garnet amphibolite assemblage...white micas that partially replace the hornblende and are in textural equilibrium with...
	Isotopic constraints on the thermal history of the Wind River Range, Wyoming:... Magazine article from: Canadian Journal of Earth Sciences Keane, Stephen D. Hall, Chris M. Essene, Eric J. Cosca, Michael A. DeWolf, Charles P. Halliday, Alex N. October 1, 2006 700+ words ...and [sup.40]Ar/[sup.39]Ar hornblende ages have been obtained from three locations...Calculated cooling rates based on monazite-hornblende pairs of 3.4 [+ or -] 1.0 [degrees...Ar/[sup.39]Ar ages between hornblende (2652 [+ or -] 11 Ma) and biotite...
	Magmatic vs. hydrothermal origin of fluorites from Vlastejovice, Bohemian Massif Magazine article from: Journal of the Czech Geological Society Ackerman, Lukás January 1, 2005 700+ words ...Abundant violet to colourless fluorite with hornblende and garnet were formed during pegmatite...garnet (grossular-andradite), Ca-hornblende, titanite, allanite and enormous quantities...0.72 wt. %) were described from hornblende (Zcek - Povondra 1991) and titanite...

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Related entries from encyclopedias, dictionaries, and thesauruses

	hornblende—hornfels facies Book article from: A Dictionary of Earth Sciences hornblende—hornfels facies A set of metamorphic mineral assemblages produced...and typically characterized by the development of the mineral assemblage hornblende — plagioclase in rocks of basic igneous composition. Other...
	hornblende Book article from: A Dictionary of Earth Sciences hornblende An important rock-forming silicate mineral and member of the amphiboles...amphiboles; it is the general name given to a group of amphiboles (the hornblende series) with similar properties, which includes hastingsite Ca 2 (Mg...
	Gneiss Book article from: World of Earth Science ...concentrations of biotite, garnet, hornblende, mica, and other minerals . These...quartzofeldspathic, pelitic, calcarous, or hornblende gneiss. Quartzofeldspathic gneiss forms...marbles (metamorphosed limestones). Hornblende gneiss contains a large fraction of...
	Popp, Georg Book article from: World of Forensic Science ...contents were a variety of minerals , particularly that of hornblende. The principal suspect in the case was a man named Karl Laubach...extracted bits of coal and grains of several minerals, including hornblende, from under her fingernails. Georg Popp was able to obtain...
	gneiss Book article from: A Dictionary of Earth Sciences ...result of the separation of dark minerals (e.g. biotite , hornblende , and pyroxenes ) and the light-coloured quartzofeldspathic...strictly by adding a qualifying prefix, e.g. biotite gneiss, hornblende gneiss, or pelitic gneiss.