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	Migmatite - Wikipedia, the free encyclopedia
		Migmatite is a rock at the frontier between igneous and metamorphic rocks.
		Migmatites are not crystallized from a totally molten material, and are not generally the result of solid-state reactions.
		Migmatites are composed of a leucosome, new material crystallized from incipient melting, and a mesosome, old material that resisted melting.
	en.wikipedia.org /wiki/Migmatite (446 words)

	Journal of Petrology
		Implications for petrogenesis of peraluminous granite and migmatite
		Vein migmatite is characterized by preservation of stratigraphic layering, and leucosomes are restricted to m-scale layers of pelite separated by m-scale layers of psammite.
		All migmatites are typified by fibrolite and biotite as the main fabric-forming phases in the mesosome (e.g.
	www.geol.umd.edu /pages/faculty/BROWN/LCP/petro.htm (13623 words)

	Tectonophysics
		Stromatic migmatites are intruded by concordant to weakly discordant, m-scale composite sheet-like bodies of granite to suggest magma transport in planar conduits through the AFZ rocks.
		In inhomogeneous migmatites, although the vol.% leucosome is variable, commonly a qualitatively higher vol.% leucosome is present in comparison with the vol.% leucosome preserved in stromatic migmatites.
		The stromatic migmatites preserve a lower vol.% leucosome, which may imply that less melt was retained in these rocks than in the inhomogeneous migmatites, consistent with the residual nature of some stromatic migmatites implied by mineral modes of melanosomes.
	www.geol.umd.edu /pages/faculty.bak/BROWN/LCP/tecto.htm (14184 words)

	Earth Science Picture of the Day (Site not responding. Last check: 2007-10-11)
		It is a mixed rock in which at least one component is igneous, sometimes injected through fractures in the host rock.
		Migmatites also occur when rocks are partially melted during metamorphism, and the molten mineral assemblage resolidifies as igneous rock.
		In this outcrop, the migmatite gneiss is cut by 2.7 billion year old granite.
	epod.usra.edu /archive/epodviewer.php3?oid=204160 (109 words)

	Topology of syntectonic melt low networks in the deep crust: inferences from three-dimensional images of leucosome ...
		The light-colored parts of the migmatite (leucosome and felsic minerals in the mesosome) are white and gray.
		The less-dense parts of the migmatite (leucosome and felsic minerals in the mesosome) are white and gray.
		The denser parts of the migmatite (melanosome and mafic minerals in the mesosome) are transparent.
	www.minsocam.org /msa/ammin/TOC/1999/ND99_Data/brown.html (1246 words)

	John Pierce Falls7 (Site not responding. Last check: 2007-10-11)
		If the temperature and pressure is great enough and begins to melt the gneiss, migmatite is produced.
		Migmatite is a transition phase between an igneous and a metamorphic rock.
		As the metamorphism continued over the next 45 million years, the some of the amphibolite was changed to granitic-pegmatite-aplite.
	www.ac.wwu.edu /~babcock/v31_2.html (226 words)

	Pennsylvania Geological Survey: Geologic Abstract - Springfield Granodiorite
		This date is similar to the age of the Arden plutonic suite, a composite pluton that intrudes the Wilmington Complex, and high T-low P metamorphism of the Wissahickon Formation and moderate pressure granulite facies metamorphism of the Wilmington Complex.
		Published isograd maps of the Pennsylvania Piedmont show an area of pelitic migmatite that lies to the south of, and is intruded by, the Springfield Granodiorite to be within the kyanite + K-feldspar metamorphic zone.
		Petrographic analysis in support of recent mapping reveals that kyanite is a late crystallizing phase and is likely associated with the growth of muscovite during higher pressure and/or lower temperature metamorphism, subsequent to attainment of peak temperatures and partial melting.
	www.dcnr.state.pa.us /topogeo/gsaabstr/springfield.aspx (375 words)

	MYRMEKITE 27 OF 50
		Evidence to support this hypothesis include: (1) zoned plagioclase and myrmekite in high-grade gneisses, migmatites, and granodiorite, (2) presence of myrmekite and absence of graphic textures in pegmatites, and (3) relatively-calcic plagioclase inclusions in large orthoclase crystals and absence of plagioclase in the ground mass in leucosomes.
		Furthermore, the presence of myrmekite in the metasedimentary wall rocks and migmatites as well as in the pluton provides the basis for proposing that none of the rocks in the Cooma Complex reached melting temperatures and that metasomatic fluids modified the mineralogy and chemical compositions of these rocks.
		2) beyond the migmatite zone progressively into the pluton eliminates the hypothesis that the zoning is due to cooling during crystallization from a melt.
	www.csun.edu /~vcgeo005/cooma.htm (2740 words)

	GemRocks: Migmatite
		OTHER NAMES: Migmatites have an extremely complicated nomenclature: Several terms based on appearances and/or hypothesized geneses have been introduced into the geological literature -- for a summary, see Dietrich and Mehnert (1961).
		Most names given to migmatites used as gemrocks are based on the locality from which they have been recovered plus or minus some adjective, such as flamboid, which directs attention to their flamboyant appearances.
		Migmatites from the complex that includes the so-called Morton and Montevideo gneisses of the Minnesota River Valley region are probably the most widely seen migmatites on a worldwide basis.
	www.cst.cmich.edu /users/dietr1rv/migmatite.htm (678 words)

	PROTEROZOIC ROCKS OF THE UNCOMPAHGRE PLATEAU, WESTERN COLORADO AND EASTERN UTAH (Site not responding. Last check: 2007-10-11)
		Ambiguous zircon morphology leaves it unclear whether the 1,741-Ma date for the migmatite represents the age of migmatization or age of the protolith.
		The pluton intrudes migmatite, and pluton and migmatite fabrics are concordant.
		We interpreted the pluton intrusion to be synkinematic with final phases of folding of migmatite.
	gsa.confex.com /gsa/2001RM/finalprogram/abstract_5785.htm (370 words)

	Gneiss Domes, Migmatites, Crustal Flow
		We are investigating the relationships and feedbacks of decompression, partial melting, and extensions, with a focus on migmatites in metamorphic core complexes.
		Migmatites are commonly found in domal structures, and migmatization and flow of partially molten crust are fundamental processes in the dynamics of doming.
		Christian Teyssier as a kinematic indicator in the transition zone between the diatexite migmatite core and the detachment zone of the Okanogan complex, Washington.
	www.geo.umn.edu /orgs/whitney/gneiss_domes.html (497 words)

	RECOVERING FLOW FABRICS IN DIATEXITE: LOW-FIELD ANISOTROPY OF MAGNETIC SUSCEPTIBILITY (AMS) IN THE NAXOS MIGMATITE ... (Site not responding. Last check: 2007-10-11)
		Migmatite foliation, defined by thin biotite layers, outlines a broad dome (12x4 km) containing at least one km-scale subdome partially wrapped by an entrained marble layer.
		The planar and linear magnetic fabric obtained from AMS, and the somewhat systematic spatial variation of these data in the sampled subdome, indicates that AMS is a sensitive indicator of rock fabric in diatexite.
		Therefore, the AMS technique significantly contributes to the study of migmatites by tracking flow planes and directions in order to better understand the dynamics of partially molten crust and the development of gneiss domes.
	gsa.confex.com.cob-web.org:8888 /gsa/2005AM/finalprogram/abstract_97473.htm (501 words)

	Department of Geology- The University of Iowa
		Migmatite complexes and leucogranites make up a large component of the middle crust now exposed in the southern half of the Greenland Caledonides.
		A popular view is that this melting is contemporaneous with extensional detachment faults that unroof the migmatite complexes.
		The leucogranites are 430-424 million years old, and they intrude Neoproterozoic to Paleozoic sedimentary sequences in the upper plate of the detachments (above the migmatite complexes).
	www.uiowa.edu /~geology/people/faculty/gilotti/projects.html (1027 words)

	Whitney - Shuswap Complex images
		Christian Teyssier in the field in Naxos, examining the deformed sedimentary rocks that structurally overlie the dome.
		We are currently working on migmatites domes in British Columbia (Thor-Odin dome of the Shuswap Complex) and Washington (Okanogan dome of the Okanogan-Kettle complex).
		The dark pink (magenta) area in the core has abundant migmatites (diatexite), the ligher pink (transition zone) is migmatitic but with a lower % of melt/leucosomes (metatexite), and the purple region is comprised of high-grade metamorphic rocks mantling the dome.
	www.geo.umn.edu /orgs/whitney/shuswap.html (913 words)

	page 2 (Site not responding. Last check: 2007-10-11)
		The feldspar and the quartz that was present end up melting first and then the mafic materials stayed behind and formed this really foliated pattern in the rock, see next picture.
		The migmatite started to melt during the orogenic process but it never melted all the way to be completely metamorphosed.
		The light areas of the quartz and feldspar are called lucosomes and the dark areas made up of the biotite and the hornblende are called melanosomes.
	www.uwm.edu /Dept/Geosciences/558/Group2/page2.html (263 words)

	IngentaConnect Modelling mid-crustal migmatite terrains as feeder zones for gran... (Site not responding. Last check: 2007-10-11)
		Modelling mid-crustal migmatite terrains as feeder zones for granite plutons: the competing dynamics of melt transfer by bulk versus porous flow
		The common association of mid-crustal migmatites with an upper-level granite pluton could indicate that the migmatites are a feeder zone for the pluton.
		The MT number is strongly dependent on the melt content of the melt-rich zone (MRZ), the diameter of the MRZ and typical particle size in the MRZ.
	www.ingentaconnect.com /content/rse/tes/2005/00000095/F0020001/art00007 (235 words)

	Voice of Nigeria (Site not responding. Last check: 2007-10-11)
		It consists of high-grade metamorphic rocks which comprise a variety of gneisses, migmatites, schists, quartzites and marbles.
		The gneisses and migmatites are ubiquitous and are so intimately mixed together that they are hardly separable on the field.
		Both the quartzites and the marbles form relatively minor concordant layers within the gneiss-migmatite units, although the former being resistant to erosion, commonly features as prominent ridges.
	www.voiceofnigeria.org /nigeria/mineralRes1.html (396 words)

	Jason B. Saleeby (Site not responding. Last check: 2007-10-11)
		Zeng, L., Li, H., Xu, Z. and Saleeby, J.B., 2004, Limited migration of leucosome in a migmatite and effects of progressive partial melting on strain partitioning, Acta Geologica Sinica, vol.
		Zeng, L., Saleeby, J., and Ducea, M., 2005, Geochemical characteristics of crustal anatexis during the formation of migmatite at the southern Sierra Nevada, California: Contrib.
		Zeng, L., Saleeby, J.B., and Ducea M., 2005, Geochemical of crustal anatexis during the formation of migmatite at the southern Sierra Nevada batholith: Contrib.
	www.gps.caltech.edu /faculty/saleeby (1359 words)

	Pomona College Geology Department (Site not responding. Last check: 2007-10-11)
		I am interested in understanding partial melting in the crust during orogenesis because partial melting plays a significant role in processes such as deformation, pluton generation and emplacement, and thermal evolution of the crust.
		Deformation in orogenic belts is affected by the presence of partial melts because this is related to strain partitioning and localization of shear zones.
		Role of migmatitic units during crustal deformation: example from the Nason Ridge Migmatitic Gneiss, Cascades Core, WA.
	www.geology.pomona.edu /Fac_Pages/Zuluaga_page.htm (841 words)

	Migmatite (via CobWeb/3.1 planetlab2.tamu.edu) (Site not responding. Last check: 2007-10-11)
		Migmatite is a mixture of metamorphic and igneous rocks.
		If you look closely you can see that there is granite mixed in with the gneiss.
		The granite in the rock may have formed during metamorphism, when the temperature reached a point where the rock was partially melting
	geoinfo.geosc.uh.edu.cob-web.org:8888 /VR/inks/Migmatite.htm (47 words)

	shale, slate, phyllite, schist, gneiss, migmatite, granite
		But even with gneiss the process is not done, because if the temperature rises even higher the gneiss begins to melt.
		Such a partially melted rock is a migmatite.
		Finally the rock melts completely and we have entered the igneous realm with a magma.
	csmres.jmu.edu /geollab/Fichter/MetaRx/Barmetachanges.html (210 words)

	Rapport sur les ressources en sols du monde - 98
		Toposequence 3 with profiles 9 to 11 on gneiss and migmatite (BJ EGLI 7.
		Toposequence 2 with profiles 4 to 8 on gneiss and migmatite (BJEGLI1.
		Migmatites cover more than 60 percent of the study area.
	www.fao.org /DOCREP/005/Y3948F/y3948f16.htm (5056 words)

	New England Intercollegiate Geological Conference (Site not responding. Last check: 2007-10-11)
		Description: Detailed stable isotope, petrologic and geochemical studies of migmatites forming a localized migmatite zone in the Acadian metamorphic high of New England showed that the migmatization occurred by an anatectic partial melting process driven by infiltration of apparently F-rich isotopically-depleted magmatic fluids.
		The partial melting model is supported by trace element partitioning between migmatite leucosome and melanosome components.
		Additionally, oxygen isotope values of quartz mineral separates from migmatite leucosomes and melanosomes reveal a fractionation of oxygen isotopes between melts and residual solids during fluid-driven partial melting of pelitic rocks.
	kilburn.keene.edu /NEIGC/1996/c2.html (178 words)

	Fold (geology) - Wikipedia, the free encyclopedia
		Typical of sedimentary slump folding, migmatites and decollement detachment zones.
		This is achieved by pressure dissolution, a form of metamorphic reaction, in which rocks shorten by dissolving constituents which move to areas of lower strain.
		Folds created in this way include examples in migmatites, and areas with a strong axial planar cleavage.
	en.wikipedia.org /wiki/Fold_(geology) (1043 words)

	Marshall Point Lighthouse and Geology, Port Clyde, Maine - Figure 3 - Maine Geological Survey
		Much of the layered material is broken up into fragments of different size.
		Surrounding these blocks is migmatite, a granular quartz and feldspar rock that results from the melting in place of metamorphic rocks like these.
		The migmatite is additional evidence of the intense heat that affected these rocks which may be related to younger intrusions in the area.
	www.state.me.us /doc/nrimc/mgs/explore/bedrock/sites/mar00-3.htm (100 words)

	Nd isotope disequilibrium during crustal anatexis: A record from the Goat Ranch migmatite complex, southern Sierra ...
		Nd isotope disequilibrium during crustal anatexis: A record from the Goat Ranch migmatite complex, southern Sierra Nevada batholith, California -- Zeng et al.
		Nd isotope disequilibrium during crustal anatexis: A record from the Goat Ranch migmatite complex, southern Sierra Nevada batholith, California
		Geological and geochemical studies of a pelitic migmatite complex
	geology.geoscienceworld.org /cgi/content/abstract/33/1/53 (267 words)

	Petrogenesis of Migmatites in Maine, USA: Possible Source of Peraluminous Leucogranite in Plutons? -- SOLAR and BROWN ... (Site not responding. Last check: 2007-10-11)
		melted, the onset of which is recorded by a migmatite front.
		and larger granites in the migmatites have compositions that
		from a migmatite source similar to that exposed nearby.
	petrology.oxfordjournals.org /cgi/content/abstract/42/4/789 (499 words)

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