 | | Report (volume) | | ...................................... . In amphibolite. ...................... r ............................. 85 35 Corundum (emery) in amphibolite at Chester, Mass...........' . In anorthosite --...-........................... Origin of emery in amphibolite at Chester, Mass.................. * 81 86 92...corundum localities in the United States. ....... II. Outcrop of peridotite at Buck Creek, Clay County, N. C...peridotite area, showing the relation of the amphibolite dikes...........................-.--.......--- |  | | Journal (article/letter/editorial) | | Building 420, Beltsville, Maryland Gneissic Amphibolite at Las Palmas, Puerto Rico, and Its Significance...chert and spilite, and locally small blocks of amphibolite. A detailed structural and metamorphic study...study of a relatively large block of gneissic amphibolite at Las Palmas reveals that the rock has undergone...serpentinite. The first event recorded by the amphibolite is amphibolite facies regional metamorphism. Foliation...but metamorphosed mafic dikes cut the gneissic amphibolite. As the metamorphic grade decreased further, |  | Zhao, Lei, Zhai, Mingguo, Zhou, Xiwen, Santosh, M., Ma, Xudong (2015) Geochronology and geochemistry of a suite of mafic rocks in Chencai area, South China: Implications for petrogenesis and tectonic setting. Lithos, 236. 226-244 doi:10.1016/j.lithos.2015.09.004 | Journal (article/letter/editorial) | | online 12 September 2015 Keywords: Mafic magmatism Zircon U–Pb geochronology Geochemistry Arc root Cathaysia...granulite, garnet-bearing amphibolite, biotite-bearing amphibolite, and amphibolite from the Chencai region...Cathaysia Block of South China, that mostly record amphibolite to granulite facies metamorphism. U–Pb dating...granulite and biotite-bearing amphibolite show broadly coeval magmatism, and amphibolite- to granulite-facies...metamorphism during 435–438 Ma. The garnet-bearing amphibolite also records metamorphism at 436 Ma and the magmatic |  | Dlamini, N., Hofmann, A., Belyanin, G., Xie, H., Kröner, A., Wilson, A., Slabunov, A. (2017) Supracrustal gneisses in southern Swaziland: a basalt-sandstone assemblage of the upper Mozaan Group deformed in the Neoarchaean. South African Journal of Geology, 120 (4) 477-498 doi:10.25131/gssajg.120.4.477 | Journal (article/letter/editorial) | | assemblage of ductilely deformed supracrustal rocks (amphibolite and quartzite) and granitoid gneisses intruded...sandstones from the Mozaan Group. LA-ICP-MS U-Pb analysis of zircon grains from grey quartzite define source...to, albeit ~40 Ma younger than previous detrital zircon studies of the Mozaan Group. The age of 2.83 Ga...during partial melting. The chemistry and U-Pb zircon ages suggest that augen gneiss and granite are...three deformational events (D1, D2 and D3) at amphibolite and retrograde greenschist facies grade. The |  | | Report (chapter) | | May 21, 2018 The granulite- to eclogite- and amphibolite-facies transition: a volume and mass transfer...de Abstract: This study is focused on a specific outcrop in the Bergen Arcs, Norway where the transition...and the hydrated eclogite and amphibolite is exposed. In this outcrop the foliation in the granulite...continuous as it passes through eclogite- and amphibolite-facies rocks, presenting a challenge to understanding...increases from granulite to the eclogite and to the amphibolite. During hydration and metamorphism, the density |  | Franceschelli, Marcello, Puxeddu, Mariano, Cruciani, Gabriele, Dini, Andrea, Loi, Marilisa (2005) Layered amphibolite sequence in NE Sardinia, Italy: remnant of a pre-Variscan mafic silicic layered intrusion?. Contributions to Mineralogy and Petrology, 149 (2) 164-180 doi:10.1007/s00410-004-0642-7 | Journal (article/letter/editorial) | | Cruciani Æ Andrea Dini Æ Marilisa Loi Layered amphibolite sequence in NE Sardinia, Italy: remnant of a...Abstract A banded amphibolite sequence of alternating ultramafic, mafic (amphibolite) and silicic layers...Sardinia) and shows similarities with leptyno-amphibolite complexes. The ultramafic layers consist of amphibole...in many mafic silicic layered intrusions. Some amphibolite showing a strong Ti-, Pdepletion and REE-depletion...al. (2002) and Franceschelli et al. (2003). An outcrop at Monte Plebi, NE Sardinia, has attracted attention |  | | Journal (article/letter/editorial) | | granulite facies and the transitional zone to amphibolite facies in the western part of the Aldan granulite...rocks: lower temperature rocks (conditions of amphibolite facies) are characterized by higher DREE values...granulite (outcrops 1365, 1564, 1585) and amphibolite (outcrop 1559 for comparison) facies in the upper...the upper reaches of the Aldan River [13]. In outcrop 1365, we studied highK charnockite nebulites (chgn...1365ya). The zircon crystallized from the last melt portion has an age of 1960 ± 8 Ma. The zircon from charnockites |  | Weber, Bodo, González-Guzmán, Reneé, Manjarrez-Juárez, Román, Cisneros de León, Alejandro, Martens, Uwe, Solari, Luigi, Hecht, Lutz, Valencia, Victor (2018) Late Mesoproterozoic to Early Paleozoic history of metamorphic basement from the southeastern Chiapas Massif Complex, Mexico, and implications for the evolution of NW Gondwana. Lithos, 300. 177-199 doi:10.1016/j.lithos.2017.12.009 | Journal (article/letter/editorial) | | PT 15 19 20 Abstract 21 In this paper, U-Pb zircon geochronology, Lu-Hf and Sm-Nd isotope systematics...rutile in 30 titanite and clinopyroxene in amphibolite further indicate a previous metamorphic event...conditions. U-Pb zircon ages from felsic orthogneiss boudins hosted in deformed amphibolite and 32 migmatite...suggested by recrystallized zircon from a banded gneiss. Zircon from folded amphibolite samples yield 35 mainly...Similar ages between igneous- and metamorphic- zircon suggest 37 a coeval formation during a high-grade |  | Li, Ruibao, Pei, Xianzhi, Yang, Shuanhai, Wei, Liyong, Li, Zuochen, Yang, Gaoxue, Xu, Duoxun, Liu, Mannian, Kou, Ting (2016) Mid-Neoproterozoic Tadong amphibolites at the junction of the East Kunlun and Western Qinling Orogens – a record of continental rifting during the break-up of Rodinia. International Geology Review, 58 (4) 455-470 doi:10.1080/00206814.2015.1089423 | Journal (article/letter/editorial) | | The mineral assemblage of the TDA exhibits amphibolite facies metamorphism, and the protolith is basic...spectrometry (LA-ICP-MS) zircon U–Pb age and geochemical data of TDA. LA-ICP-MS U–Pb zircon age determination... Most samples exhibit high Nb/Ta (16.6–17.4), Nb/La (0.70–0.94), and positive ΔNb (ΔNb = 1.74 + log (Nb/Y)...Rodinia. In this paper, we report new geochemical and zircon U–Pb geochronological data for the Tadong amphibolites...Group (Pt1J) mainly includes strongly deformed amphibolite, mica-schist, and paragneiss, with some deformed |  | | Journal (article/letter/editorial) | | consists of an association of garnetiferous amphibolite and calc-silicate that was intruded at 3388 ±...deformation of the greenstones and granitoids under amphibolite facies conditions (7 kbar and 600 to 650°C) took...Kröner and Tegtmeyer (1994) reported a 3.52 Ga U-Pb zircon age for banded TTG gneisses infolded with Dwalile...Major element contents of nine granitoid and one amphibolite sample were determined using the Panalytical...hand-picking. The grains were mounted along with the TEM-2 zircon reference material (416.8 Ma, Black et al., 2004) |  | | Journal (article/letter/editorial) | | shown that the rocks correspond to the epidote–amphibolite facies (T = 400– 450°C, P = 3–4 kbar) and are...consists of the foliated uniform amphibolite in the footwall and gneiss–amphibolite unit in the hanging wall...increases in the same direction as well. Garnet amphibolite from the upper reaches of the Kholodny Klyuch...chosen as an object of isotopic dating. Garnet amphibolite occurs in the hanging wall of the metamorphic...metamorphic complex and intercalates with common amphibolite and quartzitic gneiss (Fig. 3). The metamorphic rocks |  | | Journal (article/letter/editorial) | | form separate bodies closely associated with amphibolite in the Lechana area. They occur as inclusions...inclusions within ~2.65 Ga tonalite gneiss. Amphibolite is massive, has a stratiform occurrence and is folded...hosite intruding along the fold limbs. Rare amphibolite xenoliths occur in gabbro-leucogabbro-anorthosite...by the ~2.0 Ga (2013 ± 18 Ma) U-Pb zircon overgrowth age. Amphibolite exhibit prominent granoblastic polygonal...serpentinized and host widespread magnetite-rich layers. Amphibolite and associated gabbro have conspicuous sulphide |  | Sajeev, K., Jeong, Jaehoon, Kwon, Sanghoon, Kee, Weon-Seo, Kim, Sung Won, Komiya, T., Itaya, T., Jung, Hyung-Sup, Park, Youngdo (2010) High P–T granulite relicts from the Imjingang belt, South Korea: Tectonic significance. Gondwana Research, 17 (1) 75-86 doi:10.1016/j.gr.2009.07.001 | Journal (article/letter/editorial) | | formation, and all of them have undergone high-grade amphibolite to granulite facies regional metamorphism (e...Demilitarized Zone with North Korea, a SHRIMP U–Pb detrital zircon provenance study by Cho et al. (2005) suggests...precise peak metamorphic age using SHRIMP U–Pb zircon overgrowth rims shows ca. 253 Ma (Cho et al., 2005)...a P–T evolution from eclogite to retrograde amphibolite facies (Ree et al., 1996; Cho et al., 2007),...oceanic basalt affinity (Ree et al., 1996). The amphibolite outcrop is observed as lenses or blocks within the |  | Behera, B.M., Waele, B.D., Thirukumaran, V., Sundaralingam, K., Narayanan, S., Sivalingam, B., Biswal, T.K. (2019) Kinematics, strain pattern and geochronology of the Salem-Attur shear zone: Tectonic implications for the multiple sheared Salem-Namakkal blocks of the Southern Granulite terrane, India. Precambrian Research, 324. 32-61 doi:10.1016/j.precamres.2019.01.022 | Journal (article/letter/editorial) | | shear zone. The shear zone was a greenschist to amphibolite facies shear zone being characterized by mylonitic... We have constrained the deformation events by zircon U-Pb SHRIMP geochronology on igneous intrusions...of quartz grains (Fig. 10c). 3.3. Zircon U-Pb geochronology Zircon has a high closure temperature (>...applied zircon geochronology to date charnockite and granite in the Salem-Namakkal blocks. Zircon U-Pb geochronology...Spectrometry at Curtin University in Perth, Australia. Zircon of all shapes and sizes were handpicked and mounted |  | | Report (issue) | | crystalline terrane. The mica schist and gneiss and amphibolite southwest of Newland pass northward through a...predominate is in almost direct contact with amphibolite and mica schist lacking granitic layers. (STOP...blastomylonite (STOP 4). The mica schist and amphibolite have a crystalloblastic texture, except in a...retrogressive metamorphism they have been converted to amphibolite and metagabbro. Near the northern edge of the...Ridge thrust sheet in having less mica schist, amphibolite, and migmatite, different structural and petrographic |  | | Report (issue) | | crystalline terrane. The mica schist and gneiss and amphibolite southwest of Newland pass northward through a...predominate is in almost direct contact with amphibolite and mica schist lacking granitic layers. (STOP...blastomylonite (STOP 4). The mica schist and amphibolite have a crystalloblastic texture, except in a...retrogressive metamorphism they have been converted to amphibolite and metagabbro. Near the northern edge of the...Ridge thrust sheet in having less mica schist, amphibolite, and migmatite, different structural and petrographic |  | | Journal (article/letter/editorial) | | 29 August 2014 Keywords: 40 Ar/39 Ar dating U–Pb zircon dating Limpopo Complex Fluids in the crust a b...petrography, of amphibole and mica, and further incudes zircon U–Pb geochronology on a post peak metamorphic trondhjemite...Hout River Shear Zone. The main population of U–Pb zircon dates from the trondhjemite, dating its intrusion...White triangles: zircon dates with Hf model ages (Zeh et al., 2009). Black diamonds: zircon dates (Barton...2 S/29◦ 36 45.9 E). Black diamond (11): U–Pb zircon from Petronella Trondhjemite (23◦ 20 42.4 S/29◦ |  | Janoušek, V., Vrána, S., Erban, V., Vokurka, K., Drábek, M. (2008) Metabasic rocks in the Varied Group of the Moldanubian Zone, southern Bohemia - their petrology, geochemical character and possible petrogenesis. Journal of GEOsciences, 53 (1) 31-64 | Journal (article/letter/editorial) | | Bohemia). The amphibolites are dominated by amphibolite-facies mineral assemblages of mainly tschermakitic...rocks subjected to a high-grade (up to upper amphibolite-facies) metamorphic overprint (Floyd and Winchester...gneisses and subordinate carbonate rocks, in the amphibolite-facies Varied Group, particularly at the contact...Kaplice area (Kröner et al. 1988). The Variscan amphibolite-facies metamorphism has been dated con18 ventionally...numerous intercalations of marble (± dolomite), amphibolite, calc-silicate gneiss, graphitic gneiss and quartzite |  | Beard, Brian L., Medaris, L. Gordon, Johnson, Clark M., Jelínek, Emil, Tonika, J., Riciputi, Lee R. (1995) Geochronology and geochemistry of eclogites from the Mariánské Lázně Complex, Czech Republic: Implications for Variscan orogenesis. Geologische Rundschau, 84 (3) 552-567 doi:10.1007/bf00284520 | Journal (article/letter/editorial) | | Tepl&Barrandian microplate and consists of metagabbro, amphibolite and eclogite, with subordinate amounts of serpentinite...--+7, and 367 + 4 Ma. Samples of eclogite and amphibolite do not define a whole rock Sm-Nd isochron, even...(1991); lenses of feldspathic gneiss in garnet amphibolite are not shown for the sake of clarity. Investigated...Sample Localties arble,Calc-SilicateRock, Epidote Amphibolite 1-~ Gneiss N Eclogiticrocks R Metagabbro...Stosch and ZEV N4 .J Amphibolite GarnetAmphibolite with Titanite Garnet Amphibolite with Rutile A N 50 |  | Borges, Caio César Aguiar, Toledo, Catarina Labouré Bemfica, Silva, Adalene Moreira, Chemale, Farid, Jost, Hardy, Lana, Cristiano de Carvalho (2017) Geochemistry and isotopic signatures of metavolcanic and metaplutonic rocks of the Faina and Serra de Santa Rita greenstone belts, Central Brazil: Evidences for a Mesoarchean intraoceanic arc. Precambrian Research, 292. 350-377 doi:10.1016/j.precamres.2017.02.017 | Journal (article/letter/editorial) | | Pb zircon crystallization ages between 2845 and 2785 Ma and initial 123 +2.41. Inherited zircon crystals...granodioritic intrusions of crustal derivation with U-Pb zircon 127 crystallization ages between 2792 and 2707...predominantly of tonalitic orthogneisses with U-Pb zircon crystallization age of 3.14 Ga and 131 minimum...The tonalitic orthogneisses present U-Pb 137 zircon crystallization ages between 3040 and 2930 Ma (Jost...2013) and the diorite stock 138 presents U-Pb zircon crystallization age of 2934±5 Ma (Pimentel et al |  | | Report (issue) | | detailed geologic mapping, Nd isotopic evidence, and zircon geochronology .................... 45 Brendan R...upper Tallulah Falls Formation and Poor Mountain Amphibolite ...............................................Brendan R. Bream STOP 9 (ALTERNATE) Poor Mountain Amphibolite Migmatite at Houston House....... 136 Scott D...82° 35° SC ar 36° Dwt NC t tt. e SM Te P LA n Ce tra an 36° S MW tF ga 33° 86° rr ... ar ev Br P MW GA Te BC SM 34° AL n an La Tu Tu gi F. ure AL GA AL ar ua m ne Sq |  | | Report (volume) | | B____.____________-_._-----________-___-._______ Amphibolite __________________________________________ Chlorite...ferrohornblende___--------__------_---_-----_----10. Outcrop in contact zone of Beverly Syenite, showing ellipsoidal..._ 13. Broken plagioclase amphibolite bed in augen gneiss.__.__--14. Outcrop of augen gneiss.________...pattern representing "Salem Gabbro-Diorite with amphibolite schist"). An important goal of the present study...DISTRIBUTION AND NAME Exposures of gneiss, schist, and amphibolite form a belt 1 to iy2 miles wide that extends |  | | Journal (article/letter/editorial) | | on the basis of limited isotopic-age data and outcrop location relative to inferred, ophiolitedecorated...island-arc is dated at ~ 830 Ma based on U - P b zircon ages of 847 + 14 and 823 + 11 Ma for ophiolitic...Tuluhah (Pallister et al., 1988 ), and U - P b zircon and Rb-Sr whole rock ages of 839 + 23 Ma and 821...village of Nuqrah (Calvez et al., 1983). A U - P b zircon age of 750 to 709 Ma reported by Pallister et al...1985; Stoeser and Stacey, 1988). Gneiss and amphibolite, which crop out widely in the southern part of |  | | Journal (article/letter/editorial) | | alluvial deposits. The general distribution of outcrop in the district is shown in text-fig. 2, together...Stipple indicates approximate distribution of outcrop. _ . _ Boundaries of Barrow's metamorphic zones...Clova, Angus, showing approximate distribution of outcrop in stipple, Barrow's metamorphic zones (after Barrow...following accessories: apatite, iron ore, garnet, zircon, sphene, sillimanite and very rare green hornblende...grain size. Accessory garnet, apatite, iron ore, zircon. 40. Area 2. Crags at Loch Wharral. Coarse banded |  | | Journal (article/letter/editorial) | | RELATIONS, PETROGRAPHY AND GEOCHEMISTRY OF ARCHAEAN AMPHIBOLITE DYKES AND MALENE SUPRACRUSTAL AMPHIBOLITES, NORTHWEST...relations, petrography and geochemistry of Archaean amphibolite dykes and Malene supracrustal amphibolites, northwest...northwest Buksefjorden. Eight varieties of Ameralik amphibolite dykes have been recognised on the basis of field...intruded by two principal varieties of Malene amphibolite dykes that are similar to two main categories...and Malene dykes are similar to the Tinissaq amphibolite dykes which intrude an older facies of Nfik gneisses |
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