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| 4 5 Mineral reactions at a peridotite-gneiss contact, Jotunheimen, Norway I W. L. G R I F F I N S Mi...forms reaction zones between olivine-rich and plagioclase-rich layers in the Jotunheimen complex. These...Acm, to yield low-A1 pyroxenes, spinel, and plagioclase. The uplift must be Precambrian, and suggests...crop out over large areas in Jotunheimen, central Norway. These occurrences, and others extending over ~5o...complex spinel-bearing reaction zones at the peridotite-gneiss contacts (see fig. 2 in Battey, I96o). Most |
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| (1974) 9 by Springer-Verlag 1974 The Olivine-Plagioclase Reaction: Geological Evidence from the Seiland...Northern Norway P. M. Gardner and B. Robins Geologisk Institutt Avd. A, University of Bergen, Norway Received...were developed in the marie cumulates of northern Norway at different times during Caledonian almandine...Introduction Subsolidus reaction of olivine and plagioclase at moderate and high pressures to give assemblages...in basic and ultrabasic assemblages m a y be plagioclase, spinel, or garnet, depending on the pressure-temperature |
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| olivine and plagiodase, and between pyroxenes and plagioclase, commonly produce corona assemblages of lower...by the cooling of dry olivine -F plagioclase and pyroxene + plagioclase assemblages from igneous temperatures... The formation of such coronas by regional or contact metamorphism, or by metasomati~m~, is unlikely;...and plagioclase (upper), clinopyroxene and plagioclase (middle) and orthopyroxene and plagioclase (lower)...gabbroic rock, olivine grains are separated from plagioclase by a two-shell corona (Fig. 1). The inner shell |
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| Exsolution of plagioclase from clinopyroxene in a pyroxenite from Jotunheimen, Norway M. H. BATTEY Geology...websterite from Jotunheimen shows evidence of plagioclase exsolving from clinopyroxene to form both internal...all the phases mentioned. From the ratio of plagioclase to clinopyroxene the initial clinopyroxene probably...rocks of the Jotunheim massif in Central Southern Norway. This massif is tectonically emplaced and nearly...between olivine and plagioclase in anorthosites and at a peridotite-gneiss contact in the Jotun rocks |
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| Kvesjöen, in the Norwegian Caledonides, at the contact between a lens of ultramafic rock (Fo–En-rock)...from excess Al2O3. Subsequent desilication of plagioclase then results in the formation of paragonite and...Kvesjöen, dans les Calédonides norvégiennes, au contact entre une lentille de roche ultramafique (roche...l’excédent en Al2O3. Une désilication subséquente du plagioclase a donné lieu à la formation de paragonite et...systematic zoned sequences of assemblages at the contact between rocks of contrasting compositions. Therefore |
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| of eclogites and dolerites, Kristiansund area, Norway* W. L. G R I F F I N & A. R A H E I M Grif[in...of eclogites and dolerites, Kristiansund area, Norway. Lithos 6, 21---40. Amphibolite-facies gneisses...corona-forming reactions leading to omphacite-garnet-plagioclase associations. Pyroxene-garnet pal rs formed by...plag + qtz), ornph,acite loses Na and AI as plagioclase (Anm. zo) exaolves it, perthite-like textures...address : Institute of Geology, Blindern, Oslo 3, Norway. A. Rdheim, Department of Geology and Geophysics |
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| mineral assemblage orthopyroxene + clinopyroxene + plagioclase + olivine + green spinel. These granulites are...between olivine and plagioclase imply that the reaction Abstract. olivine + plagioclase = Al-orthopyroxene...a free fluid phase. Studies in mantle-derived peridotite xenoliths (Roedder 1965; Murck et al. 1978; Green...samples contain the assemblage orthopyroxene§ plagioclase + olivine _+ green spinel + titanomagnetite and...but ranges up to 2 cm. Wherever olivine and plagioclase occur in close proximity to one another, a zone |
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| between clinopyroxene and plagioclase in the Jotun Nappe Complex, Norway, illustrate the effects of...symplectite of epidote + quartz adjacent to plagioclase, and a less well-organized intergrowth of amphibole...but the similarity of A1/Si ratios in reactant plagioclase and product symplectite indicates approximate...solution, it is necessary to use a reactant plagioclase composition which takes into account aluminous...consist of two layers, hornblende adjacent to plagioclase and zoned amphibole + quartz adjacent to clinopyroxene |
 | ENGVIK, A. K., TVETEN, E., BINGEN, B., VIOLA, G., ERAMBERT, M., FEITO, P., DE AZAVEDO, S. (2007) P-T-t evolution and textural evidence for decompression of Pan-African high-pressure granulites, Lurio Belt, north-eastern Mozambique. Journal of Metamorphic Geology, 25 (9) 935-952 doi:10.1111/j.1525-1314.2007.00736.x | Journal (article/letter/editorial) |
| DE AZAVEDO4 1 Geological Survey of Norway, N-7491 Trondheim, Norway (ane.engvik@ngu.no) 2 Institute of...of Geosciences, University of Oslo, N-0316 Oslo, Norway 3 National Directorate of Geology of Mozambique...mineral assemblage garnet + clinopyroxene + plagioclase + quartz ± magnesiohastingsite. Garnet porphyroblasts...occur in the form of monomineralic and composite plagioclase ± orthopyroxene ± amphibole ± biotite ± magnetite...immediately post-peak metamorphism. Formation of plagioclase + orthopyroxene-bearing coronas surrounding garnet |
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| Metasomatic reaction bands at the Mt. Hochwart gneiss-peridotite contact (Ulten Zone, Italy): insights into fluid-rock...2009 Abstract We investigated the contact zone between peridotite lenses and host gneisses located on...Zone, Alto Adige -Südtirol) where metasomatic contact bands occur. The country rocks are gneisses consisting...ultramafic body consists of a hectometre-sized garnet peridotite and harzburgite lens. The reaction zone shows...tremolite-anthophyllite-talc-rich rocks from the host gneiss towards the peridotite. In some cases, lenses of serpentine |
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| Horizon (AUH), a coarser-grained and unfoliated peridotite, occurs within sillimanite gneisses in northwest...olivine domains. Recrystallization of the AUH peridotite during postpeak M2 infiltration of silica-rich...in four different structural levels: (1) at the contact of the leucogneiss core with the overlying Lower...Horizon (AUH) within the Lower Series; (3) at the contact between the Lower and Upper Units (Moni and Saggri...technique (Spicuzza et al. 1998a). Biotite, plagioclase, and chlorite separates, which might react appreciably |
 | Tumiati, Simone, Thöni, Martin, Nimis, Paolo, Martin, Silvana, Mair, Volkmar (2003) Mantle–crust interactions during Variscan subduction in the Eastern Alps (Nonsberg–Ulten zone): geochronology and new petrological constraints. Earth and Planetary Science Letters, 210 (3) 509-526 doi:10.1016/s0012-821x(03)00161-4 | Journal (article/letter/editorial) |
| fluids caused isotopic disequilibrium between the peridotite minerals, preventing accurate age determinations...often carry slices, lenses or boudins of garnet peridotite. This particular type of rock is of remark- ...[1^3]). The characteristic association of garnet peridotite with high-grade granulites and migmatites (e...the crust. One example is represented by the peridotite^ migmatite association in the Ulten zone (Upper...metric to hectometric, sometimes garnetbearing, peridotite^pyroxenite bodies as well as small boudins of |
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| there are inclusions of dunites, serpentinites, plagioclase peridotites, pyroxenites, allivalites, troctolites...clinopyroxenltes (green and black), and garnetclinopyrbxene-plagioclase (eclogitic) rocks in the Quaternary alkaline...wehrlites, clinopyroxenltes, garnetpyroxene-plagioclase rocks, and fassaitic eclogites have been described...lherzolites, garnet clinopyroxenites, garnet diopside-plagioclase (eclogitic) rocks, and also megacrysts of pyrope...without pyr ope, eclogites, garnet clinopyroxene-plagioclase (eclogitic) rocks, grospydites, granulites, garnet |
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| .. ..................... Corundum in biotite, contact on saxonite .............................. U 1.......--..... 23 25 26 28 29 80 31 Corundum in gneiss. .........^.....................'. .......^......91 ILLUSTRATIONS. Page. PLATE I. Outcrop of peridotite at Buck Creek, Clay County, N. C......... II...Mont ...... VI.i Map showing location of the peridotite rocks and corundum localities of North Carolina.......... ........... VII. General view of the peridotite formation at Corundum Hill, Macon County, N. |
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| rocks through lower crustal gabbro to mantle peridotite. The Berit metaophiolite of SE Turkey exhibits...rocks contain garnet (Grt)+clinopyroxene (Cpx)+plagioclase (Pl)+corundum (Crn)±orthopyroxene (Opx)±kyanite...kyanite-rich granulite, a plagioclase-rich non-coronitic granulite, and a plagioclase-rich coronitic granulite...grew at the expense of garnet, sapphirine and plagioclase. Peak conditions were followed by isobaric cooling...cooling of ~150°C. Hornblende-plagioclase thermometry results for host amphibolite (Hbl+Pl±Crn±Grt ± relict |
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| scenario would require crustal extension and so peridotite emplacement by long-distance thrusting would...(1979) made the distinction between two types of gneiss from the Kobipoto Mountains found as boulders in...Tehoru Formation Fufa & Wahai Beds Latimor Peridotite Manusela Mtns Limestone Banda Sea Volcanics...granites and sheared amphibolites. 3.1.1 The peridotite-granite association Peridotites, typically serpentinised...central and southern Kaibobo Peninsula. Some peridotite outcrops display foliations that commonly dip |
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| ......................................... In peridotite.... .................... ................................................................. In gneiss ..-....--......'-.......--...:.............-..... In metamorphosed zone between harzburgite and gneiss .......... 58 In mica-schist .............................................................. In contact zones and inclusions....._.-......-..--._....-...rocks ...--..-..-.-.--._--------.---.._ Origin in peridotite ................_..........--.......----.-.- |
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| A. Prince and G. N. Hanson Observations on the contact metamorphism of the Biwabik Iron-Formation, Bast...sequence of basalts overlain by flysch dunite and peridotite. and the age of the area of southwestern and...volcanic-mélange sequences also. The presence of peridotite, dunite, and (or) serpentinite may be diagnostic...in the Tyee Formation, the potassium feldspar/plagioclase ratio is less CHEMICAL EVOLUTION OF GEOSYNCLINAL...of quartz with minor potassium feldspar and plagioclase in a matrix of quartz and clay. Column 2. As |
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| Survey, a description of the Corundum and the Peridotite Deposits of Western North Carolina, pre¬ pared...Topographic forms. Superficial aspects . Ecology of the peridotite areas. 61 62 64 Chapter III.—-Petrography of...County, North Carolina. Elf dunite. Elf amphibole-peridotite. Elf troctolite. Elf amphibolite. Elf gabbro...area. Buck Creek dunite. Buck Creek amphibole-peridotite. Buck Creek troctolite and olivine-gabbro. Corrosion...Glenville. Harzburgite on Big Ridge. Amphibole-peridotite of Shoal Mountain. Vicinity of French Broad River |
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| of Feldspars Alkali Feldspars . . . . . . . Plagioclase Feldspars . . . . . Phase Relations for Natural.... . . e-Plagioclase.............. Structural Aspects of Heating. Experiments on Plagioclase . . . . ...Feldspars Plagioclase. Powder Techniques General. Alkali Feldspars and Celsian . Plagioclase and Reedmergnerite...Expansion, Compression and Phase Transformations Plagioclase Feldspars . . . . . . . . General . . . . . ...Feldspars and K-Exchanged Plagioclase General . . . . . . . . K-Exchanged Plagioclase Ternary Feldspars Ba |
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| the model predicts that weathering fronts for plagioclase and Kfeldspar would be restricted to the upper...rates of 10-12.4 mol/m2/sec. K-feldspar and plagioclase dissolution rates are 10-14.6 and 10-14.3 mol/m2/sec...Africa (chris.hatton@mweb.co.za) We analysed 103 peridotite mantle xenoliths from 15 kimberlite pipes located...peridotites from a ~2m high peridotite-gabbro section from the Horoman Peridotite Complex, Japan. Trace elements...addition of a melt producing a highly fertile peridotite suit. Gabbros represent added melts having higher |
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| respectively. Thrusting of the basement-cover contact is insignificant, and the folds, which are completely...basementcover contact. Excluding D4 transcurrent faults, the continuity of the basement-cover contact in the...involved in thrusting. Most of the basement-cover contact has been carefully mapped, and, with minor exceptions...exceptions, is an intact depositional contact. The basement has been deformed into structures that resemble...infinite half-space (analogous to the basement-cover contact) to buckle. Instead, relief is produced by penetrative |
