 | | Journal (article/letter/editorial) | | 333 [6] PETROGENESIS OF GARNET LHERZOLITE, CIMA DI GAGNONE, LEPONTINE ALPS BERNARD W. EVANS Department...received April 4, 1978 Garnet lherzolite at Cima di Gagnone has chemical and mineralogical properties similar...lower Pennine Adula/Cima Lunga Nappe (Alpe Arami, Monte Duria). The Cima di Gagnone occurrence encloses...ultramafic lenses. The ultramafic rocks at Cima di Gagnone, including the garnet lherzolite, are interpreted...not inconsistent with conditions inferred for Gagnone and Arami eclogites. These conditions could have |  | | Journal (article/letter/editorial) | | Magnesiocummingtonite in Ultramafic Schists, Cima di Gagnone, Ticino, Switzerland J a c k M. Rice and Bernard W. Evans...kyanitezone rocks of the Lepontine AIps, Ticino, Switzerland. It forms prisms and needles that extend...from Switzerland. Geological Relations I n the vicinity of Cima di Gagnone, Ticino, Switzerland, more...which separate the lower Pennine nappes from the Cima Lunga Series (Preiswerk, 1932; Preiswerk et al....talc, and opaque ore pelitic rocks, diopside and forsterite in calcite-dolomite marbles, almandine-hornblende-andesine |  | | Journal (article/letter/editorial) | | garnet peridotite formed at high H2O activity, Cima di Gagnone (Central Alps) Received: 17 June 2002 / Accepted:...investigated. In the garnet peridotite at Cima di Gagnone (CDG), a weak foliation carrying a distinct...und Petrographie, ETH-Zentrum, 8092, Zürich, Switzerland E-mail: volkmar.trommsdorff@erdw.ethz.ch Tel.:...Geologisches Institut, ETH-Zentrum, 8092, Zürich, Switzerland Editorial responsibility: J. Hoefs prograde...geodynamic processes of the earth’s upper mantle. Forsterite-rich olivine dominates mantle composition and |  | Hughes, Lewis, Burgess, Ray, Chavrit, Déborah, Pawley, Alison, Tartèse, Romain, Droop, Giles, Ballentine, Chris J., Lyon, Ian (2018) Halogen behaviour in subduction zones: Eclogite facies rocks from the Western and Central Alps. Geochimica et Cosmochimica Acta, 243. 1-23 doi:10.1016/j.gca.2018.09.024 | Journal (article/letter/editorial) | | ~585 °C (Pelletier and Müntener, 2006). The Lago di Cignana region (Fig. 1, Locality 5) contains excellent...calcareous and siliceous sediments (Reinecke, 1998). Lago di Cignana is one of two Alpine regions that have occurrences...(Bearth, 1967). Previous P-T paths published for Lago di Cignana suggest peak conditions of 2.7-2.9 GPa and...2.3. The Central Alps (Cima di Gagnone) In the Central Alps, the Adula-Cima Lunga unit contains metre...bodies that correspond to the three massifs of Cima di Gagnone (Fig. 1, locality 7), Alpe Arami (Fig. 1, locality |  | | Journal (article/letter/editorial) | | olivine from garnet peridotites (Central Alps, Switzerland) ANNE-CHANTAL RISOLD1, VOLKMAR TROMMSDORFF1*...und Petrographie, ETH Zentrum, CH-8092 Zürich, Switzerland * Corresponding author, e-mail: trommsdorff@erdw...et Pétrographie, Perolles, CH-1700 Fribourg, Switzerland Abstract: Olivine with oriented ilmenite inclusions...Alpine garnet peridotites at Alpe Arami (AA), Cima di Gagnone (CdG) and Monte Duria (MD) are composed of...ilmenite (Trommsdorff et al., 2001). In the Cima di Gagnone region, this breakdown occurred during the |  | | Journal (article/letter/editorial) | | an eclogite-metarodingite suiteat Cima di Gagnone,Ticino, Switzerland BrRNnnoW. EveNs Departmentof GeologicalSciences...Technische Hochschule ETH-Zentrum.CH -8092Zilrich. Switzerland eNn Wor-RRe*rRrcHrrn M ineralog isch-P etrog...in the PenninicAdula-Cima Lunga Nappe around the summit of Cima di Gagnone,Ticino, Switzerland.The mafic...possibleoceanicorigin for the ultramafic-mafic rock suite at Cima di Gagnone. An eclogite faciesgarnet lherzolite assemblageis...serpentinization, the mafic-ultramafic rock suite at Cima di Gagnone must, at an early stage in its metamorphic |  | | Journal (article/letter/editorial) | | two peridotite samples from Alpe Arami (AA), Switzerland, were analyzed by infrared (IR) spectroscopy...H2O content of 6 ppm reported in garnet from Cima di Gagnone peridotite, which originated as abyssal peridotite...Central Swiss Alps. The rocks belong to the Adula–Cima Lunga unit, which is part of Penninic nappe pile...uncertain whereas those from Cima di Gagnone, another occurrence of GBU in the Adula–Cima Lunga unit, are thought...also present in Ti-poor peridotitic garnet (Cima di Gagnone; Padrón-Navarta & Hermann, 2017) and in eclogitic |  | | Journal (article/letter/editorial) | | of Bern, Baltzersstrasse 1-3, CH-3012 Bern, Switzerland 2Department of Earth Sciences University of Basel...Basel, Bernoullistrasse 30, CH-4056 Basel, Switzerland The area of the Central Alps (Fig. 1) is delimited...lying, despite two young, regional culminations (Ticino and Toce domes), whereas two steep belts delimit...Adula nappe (e.g. Trescolmen) and the Cima Lunga unit (e.g. Gagnone), but we have recently found eclogite...classical localities of Cima di Gagnone and Alpe Arami which belong, respectively, to the Cima Lunga unit and |  | | Journal (article/letter/editorial) | | cases on the location of the anthophyllite + forsterite field in the phase diagram for MSH—assuming (not...those occurring in metaperidotite at Cima di Gagnone, Ticino, Switzerland (Rice et al. 1974; Pfeifer 1978...cummingtonites of metaperidotite such as at Cima di Gagnone contain on average 3 and 4.3% tremolite in...transformation in metamorphosed ultramafic rocks, Ticino, Switzerland. Transactions of the American Geophysical...alpine Deformation und Metamorphose in der nördlichen Cima-Lunga Einheit, Zentralalpen (Schweiz). Schweizerische |  | | Journal (article/letter/editorial) | | magnesian phases exhibit a Mg/Si ratio higher than forsterite. In contrast, the centre of the capsule was enriched...explained by separating the bulk into several domains of dierent bulk compositions. Results indicate that small...Sonneggstrasse 5, ETH Zentrum, 8092 ZuÈrich, Switzerland E-mail: roland.stalder@erdw.ethz.ch Tel.: +41-1-6323179...phase must be stable in an assemblage containing forsterite and enstatite, i.e. in a mantle bulk composition...with Mg/Si-ratios higher than forsterite cannot occur with forsterite and enstatite as long as a hydrous |  | Shen, Tingting, Hermann, Jőrg, Zhang, Lifei, Padrón-Navarta, José Alberto, Chen, Jing (2014) FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle. Contributions to Mineralogy and Petrology, 167 (4) doi:10.1007/s00410-014-0992-8 | Journal (article/letter/editorial) | | in olivine associated with antigorite, diopside (Di) and magnetite (Mag) magnetic separation after crushing...voltage, 20 nA beam current. Natural jadeite (Si), forsterite (Mg), haematite (Fe), albite (Na, Al), rutile...Kitamura et al. 1987); (2) garnet peridotites at Cima di Gagnone, Central Alps (Risold et al. 2001) with a peak...defects. The FTIR spectra of olivines from Cima di Gagnone, Dabie Shan and Almirez Massif all display...olivine have also been described from Almirez, Cima di Gagnone and Dabie shan (see above) that are all related |  | | Journal (article/letter/editorial) | | GILIO4 1 Dipartimento di Scienze della Terra, Ambiente e Vita, Università di Genova, C.so Europa 26...scambelluri@dipteris.unige.it 2 Dipartimento di Scienze della Terra “A. Desio”, Università di Milano, Via S. Botticelli...Istituto di Geoscienze e Georisorse, CNR, Via G. Moruzzi 1, 56124 Pisa, Italy 4 Dipartimento di Scienze...Scienze della Terra e dell’Ambiente, Università di Pavia, Via A. Ferrata 1, 27100 Pavia, Italy Abstract: The...localities (Betic Cordillera, Spain; Central Alps, Switzerland) indicate that rocks record comparable subduction |  | | Journal (article/letter/editorial) | | Sciences, University of Bern, CH-3012 Bern, Switzerland Research School of Earth Sciences, Australian...1998; López Sánchez-Vizcaíno et al., 2005) and Cima di Gagnone in the Swiss Central Alps (Scambelluri et al...metamorphic conditions of Cerro del Almirez and Cima di Gagnone correspond to 50 to 80 km depth (Evans and...of Geological Sciences, University of Bern, Switzerland, and a JEOL JXA8200 superprobe housed at the...91–0.93 and 0.92–0.95, respectively, with the forsterite content of olivine slightly higher in 4.0 GPa |  | | Journal (article/letter/editorial) | | shear deformation experiments on Fe-free olivine (forsterite) using multi-anvil apparatus at P = 11 GPa and...two deformation experiments on single-crystal forsterite at P = 2.1–7.5 GPa and T = 1,100–1, 404 ◦ C using...reported that the dominant slip direction of forsterite changes from b = [100] to [001] between P = 3...peridotites from Mount Higashi Akaishi, Japan7 , Cima di Gagnone, Switzerland8 and Val Malenco, Italy9 . Our...Deformation fabrics of the Cima di Gagnone peridotite massif, Central Alps, Switzerland: Evidence of deformation |  | Hermann, Jörg, Fitz Gerald, John D., Malaspina, Nadia, Berry, Andrew J., Scambelluri, Marco (2007) OH-bearing planar defects in olivine produced by the breakdown of Ti-rich humite minerals from Dabie Shan (China) Contributions to Mineralogy and Petrology, 153 (4) 417-428 doi:10.1007/s00410-006-0155-7 | Journal (article/letter/editorial) | | Spain) and from a garnet peridotite (Cima di Gagnone, Switzerland). Note that all spectra display a strong...et al. (2001) for garnet peridotites from Cima di Gagnone, Central Alps. These rocks were subducted during...spectrum we recorded from an olivine sample from Cima di Gagnone (Berry et al. 2005) that derives from the sample...presence of Ti-clinohumite layers in olivine. The Cima di Gagnone olivine grains also contain palisades of ilmenite...Dabie Shan, BK Buell Park kimberlite, CdG Cima di Gagnone, AM lmirez Massif, Exp experimental result |  | Pellegrino, Luca, Malaspina, Nadia, Zanchetta, Stefano, Langone, Antonio, Tumiati, Simone (2020) High pressure melting of eclogites and metasomatism of garnet peridotites from Monte Duria Area (Central Alps, N Italy): A proxy for melt-rock reaction during subduction. Lithos, 358. 105391 doi:10.1016/j.lithos.2020.105391 | Journal (article/letter/editorial) | | Tumiati3 1 Dipartimento di Scienze dell’Ambiente e della Terra, Università degli Studi di Milano-Bicocca, ...Piazza della Scienza 4, 20126 Milano, Italy Istituto di Geoscienze e Georisorse-C.N.R. U.O.S. of Pavia, Via...Pavia, Italy 3 Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Mangiagalli 34...e- Abstract Pr In the Monte Duria area (Adula-Cima Lunga unit, Central Alps, N Italy) garnet peridotites...et al., 2010). The rn Monte Duria area (Adula-Cima Lunga nappe, Central Alps, Italy) is a unique terrane |  | | Journal (article/letter/editorial) | | Cannaò ⁎ Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, Via S. Botticelli...deserpentinized rocks (Cerro del Almirez, SE Spain and Cima di Gagnone, Central Alps) have been related to interaction...34 Mg2SiO4 + 51 H2Oantigorite +20 brucite = 34 forsterite +51 H2O. (vi) Mg48Si34O85(OH)62 = 14 Mg2SiO4...Mg2SiO4 + 20 MgSiO3 + 31 H2Oantigorite = 14 forsterite +20 enstatite +31 H2O. Reaction (v) occurs at about 450...9 H2O 20 chrysotile/lizardite = antigorite +6 forsterite +9 H2O. (iii) 17 Mg3Si2O5(OH)4 = Mg48Si34O85(OH)62 |  | | Journal (article/letter/editorial) | | Dipartimento di Scienze della Terra e Geologico-Ambientali, UniÕersita´ di Bologna, Piazza di Porta S. Donato...increase was also noted in rodingites from Cima di Gagnone by Evans et al. Ž1979., and seems to be a peculiarity...harzburgites. These olivine types are mainly forsterite in composition, ranging only in rare cases to...Trommsdorff Ž1983. in meta-peridotites from Cima di Gagnone in the Central Alps. 4.1.4. Serpentine The...conditions for the development of enstatite plus forsterite from the breakdown of antigorite, according to |  | | Journal (article/letter/editorial) | | ultramafic rocks contain garnet, enstatite, diopside, forsterite, and subordinate clinohumite, magnesite, chromite...Maowu harzburgite consists of coarse-grained forsterite (60–70 vol%) and enstatite (25–35 vol%), with...chromite inclusions and exsolved lamellae in forsterite from upper mantle samples may have formed as...previous sections is characterized by: (1) a forsterite-rich (Fo93) composition; (2) a topotaxial relationship...Fe2O3 content is difficult to accommodate in the forsterite structure at low pressure. If the original “olivine” |  | | Journal (article/letter/editorial) | | underwent medium- and high-grade metamorphism contain forsterite-enstatite-spinel assemblages (Frost, 1975; Irving...(1979) Serpentinite und Rodingite der Cima Sgiu (SW Aduladecke, Ticino). Schweiz Mineral Petrogr Mitt 59:319-347...eclogite-metarodingite suite at Cima di Gagnone, Ticino, Switzerland. Am Mineral 64:15-31 Evans BW, Trommsdorf |  | | Journal (article/letter/editorial) | | performed on the stability of tremolite plus forsterite in the system H 2 0 - C a O - M g O - SiO2 from...maximum stability of tremolite in the presence of forsterite is about 825~ at 5 kbar. Addition of A120 3 to...upper-thermal stability of amphibole in the presence of forsterite in this system is : Ca2MgsSisOzz(OH)2 q- MgzSiO...the maximum thermal stability of tremolite plus forsterite to be about 810 ~ C ( + 30 ~ C). A direct determination...2 (alumino-tschermakite). In the presence of forsterite the upper stability of alumino-tschermakite is |  | | Journal (article/letter/editorial) | | during diffusion creep of Fefree olivine (i.e. forsterite) (Miyazaki et al., 2013). Furthermore, olivine...B-type fabric in a peridotite mylonite from the Cima di Gagnone massif (Swiss Alps), which recorded de- formation...the presence of water during deformation in the Cima di Gagnione massif. In contrast, Drury et al. (2011)...Acknowledgements We thank Dr. Karsten Kunze (ETH-Zürich, Switzerland) and Dr. Bjarne Almqvist (ETH-Zürich) for their...Cordier, P., 2004. Shear deformation experiments of forsterite at 11 GPa - 1400 ◦ C in the multianvil apparatus |  | | Journal (article/letter/editorial) | | range of 8 14 kbar. In the presence of excess forsterite and water, the garnet- to spinel-peridotite transition...intersects the dehydration curve for amphibolc+forsterite at an invariant point estimated to lie at 855_+...phases of a n h y d r o u s peridotites, i.e., forsterite, orthopyroxene, clinopyroxene, anorthite, spinel...and 11.518.5kbar with a mixture of synthetic forsterite and garnet ((Mg2.gCao.6)A12Si3012), two hydrous...orthopyroxene, ctinopyroxene, garnet, spinel, and forsterite. Application of Schreinemaker's analysis to these |  | | Journal (article/letter/editorial) | | peridotites studied are typical of mantle phases: forsterite-rich olivine, enstatite-rich orthopyroxene, diposide-rich...garnet peridotite formed at high H2O activity, Cima di Gagnone (Central Alps). Contributions to Mineralogy...of the garnet-peridotite of Alpe Arami (Ticino, Switzerland). Leidse Geologische Mededelingen, 42, 61–130...Deformation fabrics of the Cima di Gagnone peridotite massif, Central Alps, Switzerland: evidence of deformation |  | Nagaya, Takayoshi, Wallis, Simon R., Kobayashi, Hiroaki, Michibayashi, Katsuyoshi, Mizukami, Tomoyuki, Seto, Yusuke, Miyake, Akira, Matsumoto, Megumi (2014) Dehydration breakdown of antigorite and the formation of B-type olivine CPO. Earth and Planetary Science Letters, 387. 67-76 doi:10.1016/j.epsl.2013.11.025 | Journal (article/letter/editorial) | | into Tremolite (Tr = olivine + tremolite), Diopside (Di = olivine + antigorite + diopside), and Talc (Tlc...neoblastic olivine shows a distinctly higher Fo (forsterite) content (>92 mol.%) than the porphyroclastic...dehydration reaction of antigorite: Antigorite = 18 Forsterite + 4 Talc + 27 H2 O The stability range of the...Tlc = Talc, Fo = Forsterite, Tr = Tremolite, Anth = Anthophyllite, En = Enstatite, Di = Diopside, Atg...Val Malenco, Italy (Jung, 2009); CDG = Cima di Gagnone, Switzerland (Skemer et al., 2006); AK = Almklovdalen |
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