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Topic: Mafic

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	Welcome to Mafic Studios, Inc.!
		Mafic Studios is a 3D animation company based in Sudbury, Ontario, Canada.
		In March 2005, Mafic Studios created its first image for Popular Science, illustrating the feature article, on Bigelow Aerospace.
		Since then, we have illustrated nine articles, which have appeared in the March, June, July, August and September issues, with several images due to appear in the near future.
	www.maficstudios.com (292 words)

	Mafic - Wikipedia, the free encyclopedia
		In geology, mafic minerals and rocks are silicate minerals, magmas, and volcanic and intrusive igneous rocks that have relatively high concentrations of the heavier elements.
		Mafic minerals are usually dark in color and have a specific gravity greater than 3.
		In terms of chemistry, mafic rocks are on the other side of the rock spectrum from the so-called felsic rocks.
	en.wikipedia.org /wiki/Mafic (213 words)

	Mafic vs. Felsic (Site not responding. Last check: 2007-10-17)
		Mafic is used for silicate minerals, magmas, and rocks which are relatively high in the heavier elements.
		Mafic minerals are usually dark in color and have relatively high specific gravities (greater than 3.0).
		Mafic magmas are usually produced at spreading centers, and represent material which is newly differentiated from the upper mantle.
	jersey.uoregon.edu /~mstrick/AskGeoMan/geoQuerry11.html (308 words)

	Mafic Dikes of the Beartooth Mountains, Montana and Wyoming
		Mafic Dikes of the Beartooth Mountains, Montana and Wyoming
		The 1467 Ma mafic magmatic event, based on U-Pb dating of W- and NW-trending dikes in the Granite Mountains and Wind River Range, may be related to continental extension associated with development of the Mesoproterozoic Belt Basin along the northwestern margin of the Wyoming craton.
		Gunbarrel mafic magmatic event) along the western margin of North America that extends from the Teton Range in Wyoming north to the Mackenzie Mountains of Canada.
	mason.gmu.edu /~sharlan/mafic_dikes_beartooth_mountains.htm (2535 words)

	FracMan - Software and Consulting for Fractured Reservoirs
		MAFIC provides for dual porosity interaction using either quadrahedral finite elements or a 1-D approximation based on the Warren and Root pseudo-steady state approximation.
		MAFIC was designed to simplify input data requirements while providing maximum flexibility for the designation of boundary conditions.
		MAFIC is generally used for fracture networks of 10 to 10,000 fractures, although it and has been applied for networks of up to 100,000 fractures using triangular finite elements and 300,000 fractures using pipe elements.
	fracman.golder.com /software/mafic.asp (425 words)

	Mafic (Site not responding. Last check: 2007-10-17)
		Mafic is a term used in geology for silicate minerals, magmas, and rocks which have relatively high concentrations of the heavier elements.
		The term is a combination of "magnesium" and "ferric," the Latin word for iron, but mafic magmas also are rich in calcium and sodium.
		Common rock-forming mafic minerals include olivine, pyroxene, amphibole, biotite and other micas, augite and the plagioclase feldspars.
	www.aaaah.org /wiki/en/ma/Mafic.htm (108 words)

	Polybaric Petrogenesis of Mafic Layers in the Horoman Peridotite Complex, Japan (Site not responding. Last check: 2007-10-17)
		Mafic layers are scarce and are typically no more than a few centimeters thick, but a thick mafic layer, up to a few meters in thickness, occurs in a plagioclase lherzolite layer.
		In the Upper Zone, harzburgites are the dominant wallrocks of the mafic layers (Figs 3 and 4), typically forming a sequence: mafic layer-harzburgite-plagioclase lherzolite; whereas in the Lower Zone mafic layers generally occur within plagioclase lherzolite (Fig.
		Garrido, C. and Bodinier, J. Diversity of mafic rocks in the Ronda peridotite: evidence for pervasive melt-rock reaction during heating of subcontinental lithosphere by upwelling asthenosphere.
	library.iem.ac.ru /j-petr/12-4099/html/egc085_gml.html (10174 words)

	GSA Cordilleran Section Field Trip Guidebook: Independence Dike Swarm
		Cretaceous ages on several dated mafic dikes led to the uncomfortable fear that all mafic Independence dikes are Cretaceous, but several U-Pb ages near 148 Ma have recently been determined for mafic IDS dikes (Table 1; e.g., Coleman et al., 1994, 1998; R. Whitmarsh and J. Walker, unpublished).
		The mafic rocks contain layering from <1 cm to >10 cm in thickness that is especially strong near the contact with granite at the highest point on the ridge.
		Mafic dikes cut cm- to meter-scale mylonite zones in the plutons and themselves are deformed by 1 - >10 meter-wide NNE-striking reverse-sense shear zones with a varying sinistral strike-slip component.
	www.geolab.unc.edu /Petunia/IDS_Web_Site/FTG.html (8405 words)

	mafic rock
		It is derived from magnesium and ferric (iron).
		The term mafic also applies to dark-coloured minerals rich in iron and magnesium as a group.
		‘Mafic rocks’ usually refers to dark-coloured igneous rocks such as basalt, but can also refer to their metamorphic counterparts.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0046866.html (156 words)

	THE GUNBARREL MAFIC MAGMATIC EVENT: A KEY 780 MA TIME MARKER FOR RODINIA PLATE RECONSTRUCTIONS (Site not responding. Last check: 2007-10-17)
		Pb dates from the eight mafic dikes and sheets are statistically indistinguishable and we have combined sixteen individual baddeleyite analyses to yield a composite U-Pb Concordia age of 780.3 ± 1.4 Ma (95% confidence level).
		Other mafic rocks that may be part of the gunbarrel event include some of the voluminous mafic sills that intrude the Belt/Purcell Supergroups in the U.S. and Canada and the northwest-trending dike at Mount Moran in the Teton Mountains of Wyoming.
		The origin of the mafic magmatism of the Gunbarrel event is not clear, but it may be related to mantle plume activity or the upwelling of asthenosphere leading to crustal extension accompanying initial breakup of the supercontinent Rodinia and development of the proto-Pacific Ocean.
	gsa.confex.com /gsa/2003AM/finalprogram/abstract_59063.htm (403 words)

	Mafic layered intrusions
		The Akanvaara and Koitelainen intrusions, ca 2440 Ma old, represent a group of cratonic mafic layered intrusions (aged from 2500 to 2440 Ma) of the Fennoscandian (Baltic) Shield.
		Cumulus phases separated mainly in a hybrid melt between the mafic main magma and the overlying buoyant acid melt.
		The contaminants are found in cumulates as fossil melt and magma inclusions in olivine, chromite, orthopyroxene and plagioclase, and as "granitic" intercumulus material.
	www.gsf.fi /info/bt395.html (677 words)

	CVO Menu - Mafic Volcanoes - Monogenetic Volcanoes
		Most mafic eruptions in the Three Sisters region have produced limited tephra deposits and lava flows that traveled typically 5-15 kilometers (3-9 miles) and rarely 15-20 kilometers (9-12 miles) from vents.
		Mount Bachelor, a 1,000-meter-high (3,500 feet) mafic shield volcano, lies at the north end of a 25-kilometer-long (15 mile) chain of scoria cones and shield volcanoes that together cover 250 square kilometers (100 square miles).
		Hundreds of mafic volcanoes scattered through the Three Sisters region are part of a much longer zone along the High Cascades of Oregon in which birth of new mafic volcanoes is possible.
	vulcan.wr.usgs.gov /Glossary/VolcanicFields/description_volcanic_fields.html (3700 words)

	Metamorphism of Ultramafic and Mafic Enclaves Within Granulites
		Mafic and ultramafic enclaves from Schirmacher Oasis preserve evidences for the earliest metamorphic event.
		Mafic enclaves comprise melanocratic pargasite-bearing gabbro, gabbroic anorthosite and ultramafic enclaves are spinel- and garnet-bearing websterite, ortho- and clinopyroxenite which occur as deformed enclaves within foliated norite.
		The study of the Songir structure reiterates the fact that greater caution should be exercised while identifying similar structures in the large and ancient Continental Flood Basalt provinces.
	www.bestindia.com /jgsi/Absts_March05.htm (1846 words)

	Petrographic and chemical-mineralogical study of mafic microgranular enclaves (Site not responding. Last check: 2007-10-17)
		The mafic microgranular enclaves (MME) associated with late hercynian granitoids from Braga - Vieira do Minho region (Centro Iberian Zone, Northern Portugal) have been studied using mineralogical and geochemical techniques.
		Mineralogical data indicate that thermal equilibrium occurred between the more mafic magma and the felsic matrix.
		The main hybridization mechanism involved is believed to be chemical diffusion resulting from compositional gradients, possibly combined with the migration of fluids.
	www.dct.uminho.pt /eng/teses/teselurdes.html (340 words)

	Atlantic Geology: Mafic intrusions on Campobello Island: implications for New Brunswick--Maine correlations.@ HighBeam ...
		Mafic intrusions on Campobello Island: implications for New Brunswick--Maine correlations.
		Late Ordovician through Early Devonian units of the Passamaquoddy Bay area are interpreted to represent sequences that evolved in arc and back-arc environments.
		The main elements of the arc are exposed on Campobello Island and include a predominantly felsic volcanic sequence to the northeast, a sequence of intercalated turbidite and mafic volcanic rocks to the southwest, and mafic dyke swarms throughout.
	www.highbeam.com /library/doc0.asp?DOCID=1G1:94126371&refid=ip_encyclopedia_hf (201 words)

	MYRMEKITE 51 OF 51
		The mafic magma crystallized as a fine-grained mafic tonalite containing more than 30 volume percent biotite, and locally, the felsic magma crystallized as coarse-grained felsic tonalite in small, agmatitic patches and veins in the mafic tonalite.
		This K was then precipitated as K-feldspar (microcline) that replaced deformed plagioclase crystals, (a) in xenocrysts in the mafic tonalite, (b) in patches of coarse-grained felsic tonalite in agmatite, and (c) in the larger mass of coarse-grained felsic tonalite that enclosed the large enclaves.
		In this process, (1) the quartz reacted with the mafic magma to produce amphibole rims, and (2) rims of the sodic plagioclase xenocrysts underwent Ca-metasomatism to form tiny amphibole crystals and aggregates of myrmekite grains with tiny quartz vermicules.
	www.csun.edu /~vcgeo005/ChiefLake.htm (5436 words)

	Mafic and Ultramafic rocks (Site not responding. Last check: 2007-10-17)
		When we talk about ultramafic/mafic rocks we're really talking about ophiolites - sections of the seafloor which were produced at spreading centers and then shoved up onto the continental margin (instead of being subducted like they're supposed to).
		This is actually a pretty rare occurrence, and would lead us to believe that mafic and ultramafic rocks should be fairly uncommon.
		It is clear that most of what we lump together as ophiolites is actually the "mafic" portion (basalt, diabasic dikes, and gabbro), with a much smaller percentage consisting of the upper mantle ultramafic units.
	jersey.uoregon.edu /~mstrick/AskGeoMan/geoQuerry23.html (399 words)

	Swans Island, Maine
		As the hot, mafic magma moved upwards, it melted the overlying crust (which is granitic in composition), producing granitic magma.
		In some outcrops, the mafic magma intruded into the granite when the granite was still liquid.
		The mafic magma cooled more quickly on the edges of the dike where the mafic magma was in contact with the colder rock forming a chilled margin.
	students.hamilton.edu /newfoundland/swansisland/swansisland.html (779 words)

	Search Results for mafic - Encyclopædia Britannica
		These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its...
		Olivines are found most commonly in mafic and ultramafic igneous rocks such as peridotites, dunites, gabbros, and basalts.
		The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron).
	www.britannica.com /search?query=mafic&submit=Find&source=MWTEXT (318 words)

	Mafic Studios, Inc.
		I must say, it's considerably better than flipping burgers!
		Since those tender beginnings, Mafic Studios now does business internationally, with many interesting people and companies, on some very interesting subjects.
		We specialize in RandD contracts; taking vague sketches and cutting edge conversations and massaging them into imagery to suit the client's needs.
	www.maficstudios.com /about.html (214 words)

	Magma Table (Site not responding. Last check: 2007-10-17)
		Mafic lavas erupt to form basalts, but rising mafic magmas also melt continental crust causing felsic lavas to erupt forming rhyolites.
		Often early eruptions are mostly mafic becoming more intermediate as the island arc grows.
		Mafic magmas erupted forming a chain of volcanoes extinct volcanoes
	www.trinity.edu /gkroeger/geos1304/Notes/magma_table.htm (203 words)

	VERTICALLY-LAYERED MAFIC INTRUSIONS IN THE EASTERN AND WESTERN GRENVILLE PROVINCE: ORIGIN AND IMPLICATIONS (Site not responding. Last check: 2007-10-17)
		Once subjected to orogenesis, collapsed mafic-silicic layered intrusions (MASLI) and mafic intrusions with primary vertical layering are respectively difficult to distinguish from syn-tectonic mafic-felsic sheet intrusions emplaced in steep deformation zones and from folded or tilted horizontally-layered intrusions.
		Their distinction is critical to the understanding of mafic magmatism in the Grenville Province and to the development of sound geological models to support mineral exploration.
		Late-stage mafic dykes brought up magmatic sulphides along the flanks of the body and across its fold hinge.
	gsa.confex.com /gsa/2001AM/finalprogram/abstract_20228.htm (485 words)

	USGS Western Mineral Resources:Large mafic igneous province (LIP) in Central AK (Site not responding. Last check: 2007-10-17)
		Determining the tectonic setting of the vent systems for eruption can shed light on plume vs. rift origins as well as defining the most likely pathways for magma transport.
		In the central Alaska Range, a major eruptive center for the sub-continental-scale Triassic Nikolai Greenstone mafic LIP is very well exposed and hosts PGE, Ni and Cu mineralization in magmatic sulfides.
		Because of the extent of the flood basalt and the abundance of layered intrusions in the Amphitheater Mountains, the Nikolai LIP in this region has the potential to host world-class deposits of PGE and/or Ni-Cu, because it is a huge magmatic system with high flow volume.
	minerals.usgs.gov /west/projects/lipdel.shtml (532 words)

	IngentaConnect Lamprophyre-derived high-K mafic enclaves in Variscan granitoids ... (Site not responding. Last check: 2007-10-17)
		Lamprophyre-derived high-K mafic enclaves in Variscan granitoids from the Mecsek Mts.
		Variscan magnesio-potassic microcline megacryst-bearing quartz monzonite and monzogranite contain several chromite-bearing high potassic mafic enclaves of various sizes in Mórágy Hills (South Hungary).
		Mafic enclaves became more lamprophyric and the acidic one enriched in K and Mg.
	www.ingentaconnect.com /content/schweiz/njma/2004/00000180/00000002/art00002 (243 words)

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