 | | 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...eummingtonitc along lamellae ]l(010) and ]1(100). Cummingtonite is believed to have partially inverted to anthophyllite...phase relationships between anthophyllite and cummingtonite have been based in part on the scarcity of reports...reports of highly magnesian cummingtonite in the literature (e.g. Boyd, 1959; Klein, 1964; Ross, Papike |  | | 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) | | long-range order of Fe2+ and Mg on the M-sites of cummingtonite-grunerite and anthophyllite may be considered...order-disorder. End-member thermodynamic properties of cummingtonite and ferroanthophyllite are derived from those...XFe ≤ 0.1. LnKD for Fe-Mg exchange between cummingtonite and anthophyllite passes through zero at XFe...marginally stable with respect to end-member cummingtonite, and the addition of Ca renders the breakdown...monoclinic cummingtonite-grunerite (predominantly C2/m, but P21/ m in low-temperature cummingtonite) and orthorhombic |  | Cannaò, E., Agostini, S., Scambelluri, M., Tonarini, S., Godard, M. (2015) B, Sr and Pb isotope geochemistry of high-pressure Alpine metaperidotites monitors fluid-mediated element recycling during serpentinite dehydration in subduction mélange (Cima di Gagnone, Swiss Central Alps) Geochimica et Cosmochimica Acta, 163. 80-100 doi:10.1016/j.gca.2015.04.024 | Journal (article/letter/editorial) | | serpentinite dehydration in subduction mélange (Cima di Gagnone, Swiss Central Alps) E. Cannaò a,⇑, S. Agostini...c a Dipartimento di Scienze della Terra, dell’Ambiente e della Vita, Università di Genova, C.so Europa...evolution of the plate-interface itself. At Cima di Gagnone, pelitic schists and gneiss enclose chlorite...Here we define the element exchange process in the Gagnone mélange by means of the B, Sr and Pb isotope analysis...from the surrounding metasediments. The whole Gagnone rock-suite is finally overprinted by retrograde |  | Müller, Wolfgang Friedrich, Schmädicke, Esther, Okrusch, Martin, Schüssler, Ulrich (2003) Intergrowths between anthophyllite, gedrite, calcic amphibole, cummingtonite, talc and chlorite in a metamorphosed ultramafic rock of the KTB pilot hole, Bavaria. European Journal of Mineralogy, 15 (2) 295-307 doi:10.1127/0935-1221/2003/0015-0295 | Journal (article/letter/editorial) | | between anthophyllite, gedrite, calcic amphibole, cummingtonite, talc and chlorite in a metamorphosed ultramafic...sequence talc ® anthophyllite ® anthophyllite/cummingtonite intercalations ® anthophyllite ® Ca-amphibole...intergrowth is about 15 µm in width, but individual cummingtonite lamellae intercalated with dominant anthophyllite...exsolves lamellae of cummingtonite //(100). With one possible exception, cummingtonite has the space group...multiplicity faults //(010), anthophyllite and cummingtonite chain arrangement faults //(100). Microstructures |  | | 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) | | domains in omphacite from eclogites from the Adula/Cima Lunga nappe. The measured mean antiphase domain...scales are considerably large. Eclogites of the Adula/Cima Lunga nappe in the Central Alps are suitable for...The Adula/Cima Lunga nappe belongs to the Penninic nappe pile of the Central Alps (Switzerland). A detailed...was compiled by Schmid et al. (1996). The Adula/Cima Lunga unit was part of the southernmost European...north to south. Published P-T values for the Adula/Cima Lunga-nappe are compiled in Table 1. The most recent |  | | Journal (article/letter/editorial) | | Universit~t Innsbruck, Austria Coexisting Cummingtonite and Calcic Amphibole in Amphibolites from the...accepted October 4, 1985 Summary The formation of cummingtonite in two Ca and Al-poor and Mg-rich amphibolites...H20 to be responsible for the formation of cummingtonite in these samples. KCam.Cu m (Mg/Fe) Cam The...(Mg/Fe) Cure with values of 0.6-0.7 is similar to Cummingtonite-Ca-amphibole pairs from amphibolites with oligoclase...chemische Beziehungen lassen vermuten, daf~ sich Cummingtonite sowohl nach kontinuierlichen Reaktionen (in |  | | Journal (article/letter/editorial) | | compositionin the H2r/m-C2/m transition in cummingtonite HnxroNc YlNc Departmentof GeologicalSciences...respectively,have P2,/m symmetry. In P2r/m cummingtonite from this study and from Hirschmann et al. (1994)...other P2r/m. P2r/m cummingtonite was first P2r/m-A/m phasetransition in cummingtonite along the identified...Jatre,1969 Ross et al., 1969 Rice et al., 1974; cummingtonite crystalswith Xr, t:Mg(Mg + Fe + Mn)l ImmegaandKlein...> 0.61 have the P2,/mstructure. This P2,/m cummingtonite have been reported in three pre- boundary is |  | | Journal (article/letter/editorial) | | Chester,Vermont.They occur with anthophyllite,cummingtonite,and talc betweenthe chloriteand actinolitezonesat...2970(3)A c = 5.316(3)A (010) in anthophylliteand cummingtonite, and form = v 2686.6(2)A3 B = 109.47(3)' prismatic...and cummingtonite;(4) from Chesterwereobtainedby usinga anthophyllite anthophyllite,cummingtonite, chesterite...accessory The crystalswere first mineral,and cummingtonite has ray intensitymeasurement. been observedas...minerals are all very close to anthophyllite and cummingtonite, and electron microprobe analysesshow too much |  | | Journal (article/letter/editorial) | | there are no grounds for assuming that any cummingtonite with a composition similar to anthophyllite...statement, in the very same year a variety of cummingtonite with cell P 2 i / m was discovered (Bown, 1966)...Robinson et a l . , 1969) who showed that this cummingtonite contains Mn and Mg in the M4 position in a 1:1...magnesiocummingtonites, Kisch (1969) described a cummingtonite with cell P 2 i / m containing about 80% of...Within the Ukrainian shield the anthophyllite-cummingtonite association occurs in xenoliths of metamorphosed |  | | Report (chapter) | | of Earth and Environmental Sciences, Università di Milano-Bicocca, Piazza della Scienza 4, 20126 Milano...samples are shown in the Lepontine Dome (A, Liro; B, Ticino; C, Isorno; D, Rovana; E, Verzasca; F, Moleno;...Southern Alps lower crustal section in the Strona di Omegna Valley. The Ivrea– Verbano Zone includes granulite-facies...Locations of studied samples are shown (1, Piana di Forno; 2, Nagarone; 3, Forno; 4, Ovasca; 5, Sambughetto;...oligoclase and titanite. Orthopyroxene changed into cummingtonite and tremolite/actinolite in the presence of |  | | Journal (article/letter/editorial) | | University of Bern, Baltzerstrasse 1, CH–3012 Bern, Switzerland ABSTRACT Kyanite eclogite in the Central Swiss...Engi 1983), a regular asymmetric model for cummingtonite–grunerite amphiboles (based on data from Ghiorso...Steep Belt (SSB) in the Central Alps of southern Switzerland (Fig. 1a) is largely made up of a composite of...and intermediate plagioclase, with additional cummingtonite (10 vol.%), omphacite (8%), ilmenite (1.7%)...which appears to be a product of alteration of cummingtonite. A few grains of ilmenite represent the only |  | | Journal (article/letter/editorial) | | see O'Hanley et al., 1992) and tremolite- or cummingtonite-bearing blackwalls, frequently nephrite, with...(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) | | 649-663, 1995 Thermodynamicsand petrology of cummingtonite* BrnNlnn W. Ev,lxs. M.q,RKS. GHronso Departmentof...Seattle,Washington98195,U.S.A. Ansrucr Natural cummingtonite encompassesvirtually the entire compositional...full range for cummingtonite is at least 400-800 'C and < I - I 5 kbar. Cummingtonite is also a critical...magma chambers. The solution properties of cummingtonite reflect the entropic and enthalpic consequencesof...sites appearsto be site dependent. Magnesio-cummingtonite from 0 to about l0o/ogrunerite is less stable |  | | Journal (article/letter/editorial) | | cecilia Viti Dipartimento di Scienze della Terra, Università degli Studi di Siena, via Laterina 8, 53100...the amphibole structure can result in C2/m cummingtonite (+ + + +), Pnma anthophyllite (+ + – –), and...a lattice parameters, respectively. Whereas cummingtonite and anthophyllite are widespread rock-forming... Barberi, F. and Innocenti, F. (1966) I fenomeni di metamorfismo termico nelle rocce peridotitico-serpentinose...dell’aureola del M. Capanne (Isola d’Elba). periodico di Mineralogia, 35, 735–768. Bernasconi, S. (1986) Aspetti |  | | Journal (article/letter/editorial) | | Samples from the Zermatt-Saas were taken from the Lago di Cignana area, described by Reinecke (1991, 1998)...POWELL 850 (a) ol opx di pyr mt chl ol opx di po chl ol opx di pyr mt ol opx di pyr hem H2O (mole %...ol opx di po 800 5 750 chl ol opx di po pyr Temperature (°C) 700 650 550 4 atg ol opx di pyr hem...ol 3 di pyr mt hem 2 atg ol atg ol dol dol pyr pyr mt 1 mt hem atg ol dol po mt atg ol opx di po atg...atg ol di po 600 chl ol opx di pyr hem chl ol opx di pyr atg ol di pyr mt atg ol dol po 500 atg |  | | Journal (article/letter/editorial) | | Compositions of actinolite. hornblende and cummingtonite, together with pyroxene and plagioclase, are...Both zoning patterns and FeMg partition with cummingtonite suggest that Fe/Mg of the calcic amphiboles...reactions for amphibole formation are constructed. Cummingtonite formed at lower chemical potential of CaO than...and clinopyroxenederived local systems. Both cummingtonite and actinolite were formed because of kinetic...Key-words: actinolite; arnphibolitization; cummingtonite; disequilibrium; hornblende; metagabbro INTRODUCTION |  | | Journal (article/letter/editorial) | | Compositionand temperaturedependenceof Fe-Mg ordering in cummingtonite-gruneriteas determinedby X-ray diffraction Mlnc...preferencefor M3 relative to Ml in heattreated cummingtonite-grunerite, but no significant preferenceis observed...projection of the Mdssbauer data of natural cummingtonite and grunerite collected by Hafner and Ghose...orthoamphibole of the samecomposition, indicating that cummingtonite molar volumes may also be appropriate for end-member...are no detectablevariations in cell volume of cummingtonite attributable to changes in ordering state. |  | | Journal (article/letter/editorial) | | could be actually magnesiocummingtonite (or cummingtonite, according to the revised nomenclature by Leake...micro-analyser with a special effort to find cummingtonite, which is similar in optical characteristics...in Zone IV of some metaperidotites could be cummingtonite instead of anthophyllite, but the P–T conditions...for the formation of protoanthophyllite, like cummingtonite, are thought to be not significantly different...quantitative analyses. r Fo + T 12 Atg + Fo + Di Tr OS Zone III TM Zone II Fo + Ath En 4 Fo90 |  | | Journal (article/letter/editorial) | | EMILE ARGAND 11, CH-2007 NEUCHÂTEL, SWITZERLAND 3 ISTITUTO DI GEOSCIENZE E GEORISORSE, CNR, VIA MORUZZI...other high-pressure terranes, such as Cima di Gagnone, Alps, Switzerland (Rice et al., 1974; Evans et al....eclogite–metarodingite suite at Cima di Gagnone, Ticino, Switzerland. American Mineralogist 64, 15–31...Widespread occurrence of magnesio-cummingtonite, Cima di Gagnone, Ticino, Switzerland. Contributions to Mineralogy |  | | Journal (article/letter/editorial) | | peridotite (Cima di Gagrone) from Evans and Trommsdorff(1983); square with diagonal at right top, Cima di Gagrronefrom...Alpine recrystallized garnet peridotite from Cima di Gagnone, Switzerland.The X. content of theseclinohumite...paragenesisincludesolivine, chlorite, tremolite, cummingtonite, orthopyroxene, and magrresite,and the estimated...Y. (197E)Petrogenesisof gamet lherzolite, Cima di Gagnone, I*ponrine Alps. Earth and Planerary Science |  | | Journal (article/letter/editorial) | | clinohumite, pyroxene, chromite, anthophyllite ⁄ cummingtonite, Cl-rich lizardite, carbonates and a new type...chum, clinohumite; oa, orthoamphibole; cum, cummingtonite; Ca-am, Ca-amphibole; chl, chlorite; ta, talc;...magnesite, clinohumite, chromite, anthophyllite ⁄ cummingtonite and Ca-phlogopite. Olivine with lower brightness...end-members. It could be either anthophyllite or cummingtonite, although Na-gedrite was observed as inclusions...and carbonation at low-P. The anthophyllite ⁄ cummingtonite and orthopyroxene inclusions in porphyroblastic |  | | Journal (article/letter/editorial) | | sample with intermittent grinding lite and Mg-cummingtonite. Apparently the same thing is true for Al-tremolites...the garnet therzolite occurrence at Cima di Gagnone, Switzerland, reported by Evans and Trommsdorff (1978)...tremolite suggests that the peridotite boudins at Cima di Gagnone have roughly followed a P - T path that leads...(1978) Petrogenesis of garnet lherzolite, Cimi di Gagnone, Lepotine Alps. Earth Planet Sci Lett 40 : 333 |  | | Journal (article/letter/editorial) | | Dunite-Harzburgite Complex in Western Japan 7 Hd Di /'x A A ~ Hd Di Fs s @ exso[ution IctmeUae inOpx 9 intergrown...quadrilateral enstatite (En); ferrosilite (Fs); diopside (Di); hedenbergite (Hd). (A) Clinopyroxenes in clinopyroxenebearing...similar to those of olivine--anthophyllite (or cummingtonite) pairs in some regional or contact metamorphosed...magnesiocummingtonite in ultramafic schists, Cima di Gagnone, Ticino, Switzerland. Contrib. Mineral. Petrol. 48, 245-251 |
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