 | | Journal (article/letter/editorial) | | AMERICAN MINERALOGIST OPTICALLY POSITIVE CORDIERITE FROM NEW HAMPSHIRE L. C. CoNaNr, Cornell Uniaersity,Ithaca...While making a study of the garnet deposits of New Hampshire, granite specimenswere collected from fresh...for state highway No. 9 in the town of Stoddard, Cheshire County, about 2j miles west of the Antrim town...granite led to the discovery of optically positive cordierite. Since anomalouscordierite has been reported...deemedworth while to note this occurrence. The cordierite is found in a conspicuously porphyritic granite |  | | Journal (article/letter/editorial) | | New Hampshire Mineral Locality Index Downloaded by [University of Newcastle, Australia] at 15:01 05...Grafton County. Rob Lawrence photo, courtesy Bob Whitmore. 242 ROCKS & MINERALS lthough New Hampshire...reading Jackson (1844) on the mineralogy of New Hampshire that even at this early date there was already...activity produced new localities, renewed some old localities, and resulted in new minerals being discovered...at 15:01 05 January 2015 LOCATIONS BY COUNTY Belknap County Alton area: arsenopyrite, galena, quartz |  | | Journal (article/letter/editorial) | | somemetamorphicrocks in the amphibolite and granulite facies. Two new occurrences,one from granulite faciesmetapeliticgneiss...mafic metavolcanicor metasedimentaryrocks rich in cordierite and gedrite (Robinson and Jaffe, 1969;Gable and...stabilizedthem in the presenceof quartz. New occurrences Two new occurrencesof zincian hercynite are described...Adirondacks. New 00n3-00,/.X / 79/0708-0736$02.00 York, the secondin amphibolite facies cordierite + amphibole...five km northeast of the town of Colton, New York (Stoddard, 1976a).Spinel-bearingrocks contain the assemblage: |  | | Journal (article/letter/editorial) | | contain alumi nous minerals (almandinic garnet, cordierite, tourmaline, muscovite) that are thought to be...aluminous granitic rocks, require the presence of cordierite, muscovite, almandine, or the aluminum silicate...category (Table I ) includes almandine-rich garnet, cordierite, the aluminum silicate polymorphs (mainly andalusite... Mg)3AI6B3Si603, 6 �6 (Fe, Mg)2Al.Si,O,s Cordierite } l.3-I.Sb Fe,Mg,Mn garnet Tounnaline Andalusite/...garnets are not particularly Mn rich (Miller & Stoddard 1 98 1 , Allan & Clarke 1981, Phillips et a1 1 |  | | Journal (article/letter/editorial) | | orthoamphibole-cordierite rocks, Old Woman Mountains, SE California, USA EDWARD F. STODDARD 1 AND CALVIN...27695-8208, USA 2Department of Geology, Vanderbilt University, Nashville, TN 37235, USA Abstract Proterozoic...addition to amphiboles, mineral assemblages include cordierite, biotite, garnet, Ca-rich plagioclase, and ilmenite_+rutile...occur locally in Al-rich enclaves associated with cordierite. Orthoamphiboles commonly exhibit complex microstructures...KEYWORDS: amphibolite, amphibole, orthoamphibole, cordierite, Old Woman Mountains, California. Introduction |  | | Journal (article/letter/editorial) | | SEPTEMBER.OCTOBER, 1961 PHASE RELATIONS IN CORDIERITE-GARNET-BEARING KINSMAN QUARTZ MONZONITE AND THE...ENCLOSING SCHIST, LOVEWELL MOUNTAIN QUADRANGLE' NEW HAMPSHIRE* , ' By Fnao Benr...Ansrnecr is found in porThe assemblage biotite-cordierite-garnet-microcline-plagioclase-quartz tions of...the southeastern part of the sunapee quadrangle, New Hamsphire. Adjacent pelitic schists of the Littleton...Thompson, and using Heald,s analyses of biotite, cordierite, and $arnet. Mineral assemblages of the kinsman |  | | Journal (article/letter/editorial) | | gold zone consistsof nodular sillimanitegneiss,cordierite-anthophyllite(zincianstaurolite-kyanite)gneiss...a narrow(100 m) sequenceof contrasting rocks(cordierite-anthophyllite gneiss,nodularsillimanite gneiss...andminorFe-Zn-Pb-Cusulfides;it is surroundedby cordierite-kyanite-biotiteand cordierite-anthophyllite gneisses.Nodular...sequenceconsistingof nodular sillimanite gneiss, cordierite-anthophyllite-biotitegneiss,and garnetgahnit...; o lOO Cordierite-anthophyllite-biotite rocks Cordierite-kyanite-biotite and cordierite-anthophyllite-biotite |  | | Journal (article/letter/editorial) | | 1971, 1972; Spear, 1980; Crowley and Spear, l98l; Stoddard and Miller, 1990). These studies primarily made...hysical Sciences, PrincetonUniversity,Princeton,New Jersey08544, structures between anthophyllite and...orthoamphiboles, revealing complicated lamellar morphologies, new lamellar orientations, and structural defectsthat...in the Ammonoosuc Volcanics in southwesternNew Hampshire and have been studied in detail by Robinson and...near Surry Mountain, New All the orthoamphibole samplesdescribedbelow were Hampshire. The rock came from |  | | Journal (article/letter/editorial) | | southwestNew Hampshire Tnnny Pr.aNr* Dartmouth College,Department of Earth Sciences,Hanover, New Hampshire 03755...in southwest New Hampshire. Chamberlain and Lyons extended K-feldSouthwest New Hampshire is characterizedby...characterizedby abunspar-cordierite isogradsacrosssynorogenicplutons of the dant igneous and high-grademetamorphic...high-grademetamorphic rocks formed New Hampshire Plutonic Series(Fig. l) on the basis of during the Acadian (Devonian)...study the interplay between magmatism and the cordierite, sillimanite, and garnet and that the few sammetamorphism |  | | Journal (article/letter/editorial) | | TX 75275, USA The Enrico Fermi Institute s, The University of Chicago, Chicago, IL 60637, USA Abstract...metamorphic minerals in the order staurolite > cordierite > biotite > muscovite> garnet, tourmaline, and...absorption spectrophotometry (AA) at the University of New Mexico (J. Husler, analyst, see Appendix). Li20 concentrations...amounts (Guidotti 1970; von Knorring et al. 1979; Stoddard 1979; Novak and Holdaway 198l). Nonetheless, Zn...shows that such an a p p r o a c h would provide no new information, and in the case o f tetrahedral vacancies |  | | Journal (article/letter/editorial) | | Kerala Khondalite Belt show compositional bands of cordierite, spinel, sillimanite and biotite alternating...quartz-feldspar rich bands. Reaction textures involving cordierite and garnet show evidence for decompression. Mineral...(1981). Hercynite spinel in association with cordierite was reported by Santosh (1987) from granulitefacies...occurrence of Zn-enriched spinel in association with cordierite and sillimanite from the granulite facies supracrustals...the form of large flakes associated with coarse cordierite patches. Geologic Framework Petrology Southern |  | | Journal (article/letter/editorial) | | spatially associated with Mg-rich alteration zones, shed new light on the use of zincian spinel composition as...tremolite, forsterite, cummingtonite, sapphirine, cordierite, enstatite, and clinohumite. The composition...trémolite, forstérite, cummingtonite, sapphirine, cordierite, enstatite, et clinohumite. La composition du...of zinc-bearing silicates such as staurolite (Stoddard 1979) and biotite (Atkin 1978) during metamorphism...spinel from 22 locations in Colorado, by providing new petrological information and compositions of zincian |  | Heimann, A., Spry, P. G., Teale, G. S., Jacobson, C. E. (2006) CORONAS, SYMPLECTITIC TEXTURES, AND REACTIONS INVOLVING ALUMINOUS MINERALS IN GEDRITE - CORDIERITE - GARNET GNEISS FROM EVERGREEN, FRONT RANGE, COLORADO. The Canadian Mineralogist, 44 (5) 1025-1044 doi:10.2113/gscanmin.44.5.1025 | Journal (article/letter/editorial) | | REACTIONS INVOLVING ALUMINOUS MINERALS IN GEDRITE – CORDIERITE – GARNET GNEISS FROM EVERGREEN, FRONT RANGE,... Iowa 50011–3212, U.S.A. ABSTRACT Gedrite – cordierite – garnet gneisses metamorphosed to the upper...hercynite (hc), staurolite (st), corundum (crn), cordierite (crd), and relict sillimanite (sil), associated...(ged), cordierite, garnet (grt), and quartz (qtz) (“matrix” association) by a shell of cordierite such...Zincian hercynite – cordierite symplectites occur within the inner part of the cordierite shell, whereas staurolite |  | | Journal (article/letter/editorial) | | bodies of amphibole gneiss, amphibolite, and cordierite-orthoamphibole rock are widespread, some of them...muscovite-quartz, biotite-sillimanite-K feldspar, and cordierite-K feldspar. The spinel-bearing rocks that outcrop...outcrop in the cordierite-K feldspar zone. The spinel is present along the contact with cordierite-orthoamphibole...Representative analyses of spinel, biotite, chlorite, cordierite, muscovite, and garnet are given in Tables 3-5...Plagioclase Microcline Spinel Biotite Garnet Cordierite Sillimanite Chlorite Muscovite a Tourmaline Fe-sulphides |  | | Journal (article/letter/editorial) | | Aluminous Enclaves in Gedrite-Cordierite-Gneiss from Southwestern New Hampshire, USA by JOHN C. SCHUMACHER1...ABSTRACT The aluminous enclaves occur in gedrite-cordierite-gneisses of the Middle Ordovician Ammonoosuc...and spinel (Sp), which are set in a matrix of cordierite (Crd) or plagioclase (Plag). Generally, where...from gedrite (Ged) and rare hornblende (Hbl) by cordierite. The enclaves are interpreted to have formed...(1) enclaves of cordierite surrounding aluminous minerals; and (2) enclaves of cordierite and plagioclase |  | | Journal (article/letter/editorial) | | r-ocnrn Geology Department, Union College,Schenectady,New York 12308, U.S.A. Ansrru,cr The study area extendsfor...metamorphosedrocks in the metamorphic high of southern New England, in which Acadian (Devonian) metamorphism...sillimanite-muscovite grade through sillimanite-garnet-cordierite-orthoclase grade. Over this metamorphic interval...characterizedfor common amphibolites in the high- in southern New England have been subdivided into six grade metamorphic...Znne YI, sillimanite + orthoclase + garnet * cordierite with late Precambrian rocks also exposedin the |  | | Journal (article/letter/editorial) | | orthoamphiboles coexist with quartz, the most Al-rich with cordierite or staurolite, the most Fe-rich with garnet,... the most Mg-rich with talc, chlorite or cordierite, the most Ca-rich with hornblende, and the most Ti-rich...Vermont section of the Mt. Cube Quadrangle, New Hampshire and Vermont, the PostPond Volcanic Member of...the southwestcorner of the Mt. Cube Quadrangle, New flampshire and Vermont (seelocation map, Fig. l)...southwesterncorner of the Mt. Cube Quadrangle, New Hampshire and Vermon! showing the location of the study |  | | Journal (article/letter/editorial) | | strongly into staurolite during metamorphism (Stoddard, 1979). With increasing temperature the staurolite...by several authors (Loomis, 1972; Atkin, 1978; Stoddard, 1979). M1 metamorphic parageneses Contact metamorphic...except for scarce inclusions of orthopyroxene in cordierite, suggesting that these minerals may not belong...assemblage Hc Qtz, occurring with garnet and cordierite/orthopyroxene, is diagnostic for very high-T...(a) Sketch of garnet and cordierite. The secondary garnet is replacing cordierite along the former contacts |  | | Journal (article/letter/editorial) | | and ferromagnesian reactant phases such as Fe-cordierite (Richardson 1968; Harris 1981), garnet (Shulters...of muscovite + quartz (Atkin 1978; Loomis 1972; Stoddard 1979: Tuccillo et al. 1992). A genetic relationship...high-temperature conditions in the granulite facies (Stoddard 1979; Clarke and Powell 1991; Sengupta et al....muscovite, ilmenite and graphite. Neither garnet nor cordierite occur in the Her-bearing samples. Figure 2 shows...the sillimanite-spinel segregations described by Stoddard (1979), that did not form after andalusite. Because |  | | Journal (article/letter/editorial) | | and Space Sciences, State University of New York, Stony Brook, New York 11794 1 Department of Geology and...granulite facies in the Adirondacks of northern New York during the Grenville orogeny about one billion...reconnaissance survey of the geology of northern New York State (Emmons, 1842). The Adirondacks have been...McLelland & Whitney, 1977, 1980; Jaffe et al, 1978; Stoddard, 1976, 1980; Sack, 1980; Newton, 1983) to give...General geologic map of the Precambrian of upper New York State modified from Isachsen & Fisher (1970) |  | Rahmani Javanmard, Somayeh, Tahmasbi, Zahra, Ding, Xing, Ahmadi Khalaji, Ahmad, Hetherington, Callum J. (2018) Geochemistry of garnet in pegmatites from the Boroujerd Intrusive Complex, Sanandaj-Sirjan Zone, western Iran: implications for the origin of pegmatite melts. Mineralogy and Petrology, 112 (6) 837-856 doi:10.1007/s00710-018-0591-x | Journal (article/letter/editorial) | | Geosciences, Texas Tech University, Lubbock, TX, USA Somayeh Rahmani Javanmard Rahmani.somaye@gmail.com;...peraluminous Stype granitoids (e.g. Miller and Stoddard 1981; Černý and Hawthorne 1982; du Bray 1988;...rocks, including spotted schists, cordierite-andalusite and cordierite-sillimanite hornfelses, are only...loosened and the contents dried on a heating plate. A new aliquot of HF-HNO3 solution was added to the Teflon...signature, has been attributed to the introduction of a new magma with a different REE composition (Samadi et |  | | Journal (article/letter/editorial) | | Incorporated, 21 Lynn Morse Drive, Painted Post, New York 14870, U.S.A. 1 Abstract The enrichment of...coefficients for Fe, Mg, and Mn between garnet, cordierite, tourmaline, and peraluminous, B-bearing hydrous...with decreasing temperature. The Mn content of cordierite increases with decreasing temperature. The composition...decreasing temperature for garnet, tourmaline, and cordierite. The precipitation of garnet alone results in...decrease of MnO/FeO in the melt. Crystallization of cordierite and tourmaline results in a decrease of MgO/FeO |  | | Journal (article/letter/editorial) | | Geology, RensselaerPolytechnic Institute, Troy, New York 12180, U.S.A. Ansrn-Lcr Four geobarometersfor...Spear, ano 1982andunpub.data;Selverstoneetal.,1984;Stoddard, -RZln K*,: AH, - fA& + (p - l)AV2, (2b) 1985;...(10) 71-49H Our unpublished data, west-central New Hampshirez4 -9.87 -4.45 3750 + 500 520 ( 1 1 )A...-0.04 -4.03 -4.10 (15) 74-C-2488 6200+ 1000 Stoddard (1985;zoze 690 +O.44 -3.99 -1.93 -5.25 (16)...Kretz, l98l; Spear,1982;Selverstone et al., 1984; Stoddard, 1985;Thompson and l-eclair,1987). In addition |  | Driouch, Youssef, Debat, Pierre, Ganne, Jérôme, Béziat, Didier, Kriegsman, Leo M., Martignole, Jacques (2017) The Cordierite-Orthoamphibole Rocks of the Variscan Dome of Gavarnie-GèDre-Héas: The Gedrite of Gèdre (Hautes Pyrénées, France) The Canadian Mineralogist, 55 (2) 245-281 doi:10.3749/canmin.1600032 | Journal (article/letter/editorial) | | 245-281 (2017) DOI: 10.3749/canmin.1600032 THE CORDIERITE-ORTHOAMPHIBOLE ROCKS OF THE VARISCAN DOME OF...Pyrenees, harbors a small (1 m3) but special cordierite and orthoamphibole-bearing enclave embedded within...characteristics: (1) its mineral composition is unique with cordierite (Crd) þ gedrite (Ged) þ biotitess (Bt) þ staurolite...more akin to other described occurrences. The cordierite-orthoamphibole enclave records a succession of...of the Variscan Central Pyrenees. Keywords: cordierite-orthoamphibole assemblage, gedrite, Gèdre, Pyrenees |  | | Journal (article/letter/editorial) | | Epidote phenocrysts in dacitic dikes, Boulder County, Colorado Bernard W. Evans and Joseph A. Vance...AJ-20, University of Washington, Seattle, WA 98195, USA Abstract. Epidote (Ps21%) crystallized early as...rhyodacitic dikes in the vicinity of Ward, Boulder County, Colorado. Other unusual phenocryst phases are...which is composed of upper amphibolite-facies cordierite and sillimanite-bearing gneisses. The dike magmas...Ward and Gold Hill 7.5 minute quadrangles, Boulder County (Gable and Madole 1976; Gable 1980), in the northern |
|
