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| characteristics of crustal anatexis during the formation of migmatite at the Southern Sierra Nevada, California Received:...pelite unit at mid-crustal levels that produced a migmatite complex in conjunction with the intrusion of part...Ma. Field relations suggest that this pelitic migmatite formed and then abruptly solidiļ¬ed prior to substantial...California Institute of Technology, Pasadena, CA 91125, USA E-mail: lzeng@ccsd.org.cn Tel.: +86-10-68992875 Fax:...Sciences, University of Arizona, Tucson, AZ 85721, USA L. Zeng Key Laboratory for Continental Dynamics, |
 | Chen, Yingtao, Zhang, Guowei, Lu, Rukui, Luo, Tingting, Li, Yang, Yu, Wenxin (2020) Formation and evolution of Xianshuihe Fault Belt in the eastern margin of the Tibetan Plateau: Constraints from structural deformation and geochronology. Geological Journal, 55 (12). 7953-7976 doi:10.1002/gj.3908 | Journal (article/letter/editorial) |
| evolution of the XSF, the Oligocene-Miocene migmatite zone and Miocene granites of the Zheduoshan batholith...limited by the Zircon UāPb geochronology of migmatite zone formed under the compression system. During...at https://publons.com/publon/10. 1002/gj.3908. zone of Anninghe, Daliangshan, Xiaojiang, and other faults...units: granite pluton the Tibetan Plateau. and migmatite zone (Li & Zhang, 2013).The granite pluton is mainly...pegmatites. The hightemperature metamorphic migmatite zone is distributed east of the In the Late Indosinian |
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| melting in the Little Cottonwood Contact Aureole (UT, USA): implication for xenocryst formation A. WOHLERS1...formation in the Little Cottonwood contact aureole (UT, USA). Melt was produced by muscovite and biotite dehydration...on a centimetre to decimetre scale. In the migmatite zone, melt extraction from the pelites resulted...macroscopic evidence for deformation in the migmatite zone, individual quartz grains found in quartzofeldspathic...metapelitic rocks of the Big Cottonwood (BC) formation, USA. Melt inļ¬ltration into the quartzite ļ¬rst resulted |
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| conspicuous asymmetric structure with a migmatitic zone flanked in the north and west by amphibolite facies...in the northern schist zone to 5-11 kbar and ~650-750 Ā°C in the migmatite zone in the south of the complex...Range fault zone and thrusting and exhumation focused within the southern migmatite zone and splay faults...faults of the Contact fault zone. The T/P ratios in the southern migmatite zone indicate that the thermal...(Alaska); accretionary prism; thermobarometry; migmatite; AC CE P TE D MA NU SC R exhumation process; |
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| CONTROLLED BY THE BREAKDOWN OF TOURMALINE IN THE MIGMATITE ZONE OF THE AOYAMA AREA, RYOKE METAMORPHIC BELT...tourmaline-out isograd located near the schistāmigmatite boundary of the Aoyama area, Ryoke metamorphic...amount of boron-bearing melts or fluids from the migmatite zone. Tourmaline-bearing pegmatite veins observed...considered to have been extracted from the migmatite zone. The behavior of boron in muscovite and tourmaline...Keywords: boron, tourmaline, partial melting, migmatite, muscovite, PāT path, high-grade metamorphism |
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| metamorphic zonation ranging from biotite to migmatite zones occurs in the Sierra Albarrana area (Variscan...in this area is related to a major ductile shear zone whose central part is localized immediately to the...~400Ā°C (biotite zone) to 500Ā°C (stauroliteāgarnet zone) up to 650ā700Ā°C (migmatite zone). We have not detected...the lower-grade part of the stauroliteāandalusite zone. The low-pressure metamorphism of the Sierra Albarrana...shear zone during peak PāT conditions. Channelized fluid flow within the major ductile shear zone may have |
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| tourmaline (tourmaline-out isograd) in three anatectic migmatite regions of the Ryoke metamorphic belt, SW Japan...reported. The breakdown of tourmaline in the migmatite zones and release of boron into the melts, followed...extraction of the boron-bearing melts from the migmatite zones occurred throughout the Ryoke metamorphic...schists, the degree of partial melting at the migmatite front of the Aoyama area is estimated to be 12...WORDS: Borosilicate, breakdown, leucogranite, migmatite, partial melting. Leucogranites formed by partial |
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| tourmaline (tourmaline-out isograd) in three anatectic migmatite regions of the Ryoke metamorphic belt, SW Japan...reported. The breakdown of tourmaline in the migmatite zones and release of boron into the melts, followed...extraction of the boron-bearing melts from the migmatite zones occurred throughout the Ryoke metamorphic...schists, the degree of partial melting at the migmatite front of the Aoyama area is estimated to be 12...WORDS: Borosilicate, breakdown, leucogranite, migmatite, partial melting. Leucogranites formed by partial |
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| 2001, 19, 61Ā±75 Tourmaline breakdown in the migmatite zone of the Ryoke metamorphic belt, SW Japan T ...`tourmaline-out isograd') is deĀ®ned in the migmatite zone of the Ryoke metamorphic belt, Japan. The trend...tourmaline-out isograd lies close to the schistĀ±migmatite boundary, these effects might have enhanced melt...melt generation and segregation in the migmatite zone of the Ryoke belt. The evidence for the breakdown...absence of any borosilicates throughout the migmatite zone suggest that boron was effectively removed |
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| samples used in this study were taken from the migmatite front of this area and have interboudin partitions...calculations applied to the migmatite samples, which assume average migmatite compositions to be the residue...of melt extraction of 12 ā 14 wt.% from the migmatite zone. The similarity of the estimated melting degree...Keywords: Degree of partial melting; Leucogranite; Migmatite; Trace element; REE 1. Introduction Estimation...the degree of partial melting in the pelitic migmatite zones is important for understanding how much |
 | VILĆ, M., PIN, C., LIESA, M., ENRIQUE, P. (2007) LPHT metamorphism in a late orogenic transpressional setting, Albera Massif, NE Iberia: implications for the geodynamic evolution of the Variscan Pyrenees. Journal of Metamorphic Geology, 25 (3) 321-347 doi:10.1111/j.1525-1314.2007.00698.x | Journal (article/letter/editorial) |
| biotite, andalusite-cordierite, sillimanite and migmatite). LPHT metamorphism and magmatism occurred in...the low-grade part of the andalusite-cordierite zone reached peak metamorphic conditions of 2.8 kbar...transition between andalusitecordierite zone and the sillimanite zone reached peak metamorphic conditions...well-documented example of a continental collision zone with widespread LPHT metamorphism and intense crustal...low-grade metamorphic rocks (chlorite-muscovite zone) to upper amphibolite facies rocks (VilaĢ, 2003) |
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| unmigmatized upper sillimanite zone through an incipient migmatite zone (in which granitic leucosomesfirst...leucosomesfirst appear) and a cordierite migmatite zone (in which cordierite appearswith evidenceof renewedmelting)...renewedmelting) to a garnet-cordieritemigmatite zone (in which new growths ofcoexisting garnet and cordierite appear)...amphibolite facies.In particular, the development of migmatite leucosomesaccompanied by growth ofcordierite or...have been less,but temperaturesin the highest grade zone might have attained those indicative of granulite |
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| process through intermediate stages of patch migmatite and diatexite. The average degree of partial melting...questions: (1) What is the nature of the protolithā migmatiteāgranite transition and the process that creates...the remains of a north-dipping Archaean subduction zone (Calvert et al., 1995). The UāPb ages of syntectonic...that the dextral strike-slip, Nottaway River Shear Zone is the only major fault to displace the migmatites...outside the migmatite zone, to maximum values of 0Ā·075ā0Ā·165 for rocks from the migmatite zone. Using the |
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| been called a migmatite zone (White 1966a; Offler & Fleming 1968). The migmatite zone has a NNW trend...the N. There is a close association between the zone and a number of granitic bodies such as the Palmer...CHLORITE ZONE 3 BIOTITE ZONE rnnn ANDALUSITE ' STAUROLITE ZONE Ulm E 7 i SILLIMANITE ZONE |gg8 MIGMATITE...(Murray Bridge). by both authors. It is shown that migmatite formation commenced early in the structural history...any published material in which the timing of migmatite formation relative to the deformation history |
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| 06520-8209, USA Peabody Museum of Natural History, Yale University, New Haven, CT 06511, USA Institute...Science, Rice University, Houston, Texas 77005, USA. 2 Present address: Department of Earth Sciences...thrust slice (Canaan Mountain Formation), northeast USA (Chu et al., 2016), which preserve sharp chemical...abundance of partial melt (leucosome; Fig. A.1a) in migmatite (Fig. 2), is greatest in the central part of the...schists with few or no leucosomes (Fig. 3a). The migmatite consists of quartz + plagioclase + K-feldspar |
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| +5) was present beneath this 1.9-1.7 Ga orogenic zone, as is the case in such environments today. However...proven relics of Archean crust beyond the border zone of the Ketilidian, and the eNd= 0 value appears...the form of sediments transported to the orogenic zone on oceanic crust. The Archean component comprised...Geosciences, University of Arizona, Tucson AZ 85721, USA Offprint requests to: either author that a reasonable...CONTINENTS IN 1.8-1.2Ga CONFIGURATION +. Northern Border Zone in which the Archean crust is overlain by sediment-basalt |
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| Geology, University o f Wyoming, Laramie, Wyo. (USA) Received September 17, 1973 Revised version received...basis for geothermal calculations: (1) a surface zone of intermediate metamorphic rocks containing granitic...downward into ~2) a more felsic migmatite zone, (3) a lower crustal zone of approximately andesitic composition...from this model rule out a seismic low-velocity zone in the crust produced by thermal effects. 1. Introduction...Precambrian rocks largely composed o f migmatite (included with migmatite are granite gneiss and augen gneiss |
 | Otamendi, Juan E., Barzola, MatĆas G., Tibaldi, Alina M., Cristofolini, Eber A., Ćlvarez-Valero, Antonio M., Demichelis, Alejandro H. (2019) Petrological and geochemical variations of a turbidite-like metasedimentary sequence over the metatexite to diatexite transition within the Pampean Orogen, Argentina. International Journal of Earth Sciences, 108 (4) 1361-1385 doi:10.1007/s00531-019-01711-z | Journal (article/letter/editorial) |
| and meltāresiduum separation. We report on a migmatite terrane developing from turbidite successions...migmatites are the low-temperature part of the migmatite terrane where the alternating metapelite and metagreywacke...melting the metagreywacke. The majority of the migmatite terrane consists of stromatic metatexites in which...by migmatization. Metatexite zone acts as melt transfer in the migmatite terrane. In the stromatic migmatites...anatectic melt-rich component from granulite-facies migmatite sequences toward shallow crustal levels. Turbidite |
 | Gray, C. M., Kemp, A. I. S., Anderson, J. A. C., Bushell, D. J., Ferguson, D. J., Fitzherbert, J., Stevenson, M. D. (2002) Delamerian Glenelg tectonic zone, western Victoria: Geology and metamorphism of stratiform rocks. Australian Journal of Earth Sciences, 49 (2) 187-200 doi:10.1046/j.1440-0952.2002.00922.x | Journal (article/letter/editorial) |
| (2002) 49, 187ā200 Delamerian Glenelg tectonic zone, western Victoria: geology and metamorphism of stratiform...Australia. 2 The Cambro-Ordovician Glenelg tectonic zone of western Victoria is a distinctive metamorphicā...Southwest of the central batholith, biotite to migmatite zones contain mainly quartzo-feldspathic rock...metagreywacke, quartzo-feldspathic schist and migmatite), plus less common metaquartzite and calc-silicate...and migmatite zones exclusively, with a regional concentration of pegmatites adjacent to the zone boundary |
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| Lower migmatite zone (L ā MZ), the Middle metagabbro zone (M ā MZ), and the Upper amphibolite zone (U ā...metamorphic rocks. Structural relationships of the migmatite and related rocks suggest that a small ā scale...granitoid magma in the OIA (Beard, 1995). The mafic migmatite and related granitoid occur in the Middle Unit...of an OIA setting (e.g. Hayasaka, 1991). The migmatite zone of the unit records morphologic and lithologic...morphologic and structural relationships of the mafic migmatite together with petrologic 340 Y. Suda data |
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| metapelitic sequences forming the crystalline core zone of the Himalayan orogen in the Sutlej valley (NW...conditions increase upwards from the staurolite zone at the base, through the kyanite-in and sillimanite-in...Mexico, 200 Yale Blvd. NE, Albuquerque, NM 87131, USA E-mail: zsharp@unm.edu Editorial responsibility:...core zone of this orogen. Introduction Along the entire Himalayan range, the crystalline core zone of...(LH) along the Early Miocene Main Central Thrust Zone (MCTZ). In most Himalayan sections, the HHCS is |
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| ā4.2, ā4.4 and ā7.6&, respectively) in the migmatite zone, close to the intrusion. Relict clinopyroxene...typically magmatic d18O values up to the anatectic zone, where the values are lower and more heterogeneous... Canary Islands, represents the hypabyssal root zone of an ocean island volcano, exposure of which can...2000), showing sample localities and principal migmatite orientations. NNE to NE trending dykes are ubiquitous...within each zone of the aureole, including samples from the hydrothermally metamorphosed zone, the PX2 intrusion |
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| / / * ! Andoluiite Zone Y//X Cordiertte-Orthoclose Zone V///A Migmntit*. Zone v/A Cooma Granite...and assemblages. The zone furthest from the granite has been termed the chlorite zone. The rocks are psammites...Binjura Beds to greenschist facies in the chlorite zone slightly pre-dates the main metamorphism associated...Cooma granite. The western boundary of the chlorite zone appears to correspond to the contact of the Binjura...Towards the granite, the chlorite zone gives way to the biotite zone and at approximately three miles |
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| a regional scale intracontinental ductile shear zone (15e20 km wide) bounded by the Main Central Thrust...South Tibetan Detachment System at the top. The migmatite zone in the centre has the highest grade of metamorphism...Zircons extracted from samples of metasediment, migmatite, biotite granite and in situ partial melt (tourmaline...melting in the mid-crustal intracontinental shear zone and the emplacement of the magma into the upper...when the partial melts were generated as the migmatite zone was exhumed. Ć 2018, China University of Geosciences |
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| Mountain.___________________________________ . Migmatite of McCall_______..______--_-_-_-______-._-__-_-_-____...in the migmatite of McCall. _ _ __ 6. Atypical rock rich in potassium feldspar in the migmatite of McCall...basalt to the west) ; leucocratic quartz dioritic migmatite (2 to 10 miles wide) ; quartz dioritic gneiss...feldspar, essentially zero to a few percent in the migmatite and quartz dioritic gneiss, increases to nearly...content of the plagioclase, averaging An3o in the migmatite, increases to AnĀ«o in the quartz dioritic gneiss |
