 | | Report (issue) | | 0.15 [4.31] [0.06] [100.70] (1) Mt. Cube quadrangle, Vermont, USA; by electron microprobe, H2 O content...cordierite, gedrite, chlorite, quartz. Distribution: From Norwich, Windsor Co., Vermont, and elsewhere...the Post Pond Volcanics, southwest corner of the Mt. Cube quadrangle, New Hampshire and Vermont, USA...Institute and State University, Blacksburg, Virginia, USA. Type Material: Harvard University, Cambridge, Massachusetts...National Museum of Natural History, Washington, D.C., USA, 145724, 162422{162428; The Natural History Museum |  | | Journal (article/letter/editorial) | | GRAND, ISLE: L Jirrwowwux/ lot* llMt UK* U'A VERMONT Mineral Locality Index VANDALL T. K I N G P.O....Massachusetts 01776 MASSACHUSETTS Figure J. Vermont political divisions map; adapted from U.S. Geological...of New Hampshire and Vermont (1972). 324 ROCKS & MINERALS he state of Vermont is relatively small,...quarĀ ry in the world is in Rochester (Windsor Co.), Vermont. MinĀ eral products mined "as is" for their...maintained. (The disuse of cobblestone roads prevents Vermont from being a giant mining state today, but in the |  | | Journal (article/letter/editorial) | | AmericanMineralogist,Volume65,pages 1103-lI //8, 1980 The gedrite-anthophyllite solvusand the composition limits...limits of orthoamphibote from the Post Pond Volcanics,Vermont FneNr S. Speln Department of Earth and Planetary...and low Al-Na anthophyllites) from the Post Pond Volcanics, Vermont, display a variety of textures that...to (010); exsolution is much more pronounced in gedrite than in anthophyllite, which suggeststhat the solvus...elementsbetween anthophyllite and gedrite is systematic,with gedrite enriched in Alrv, AlvI, Fe2*, Na |  | | Journal (article/letter/editorial) | | to a sequence of rocks that crop out along the Vermont-New Hampshire border (see Fig. 1). It is bounded...on the west by the Ammonoosuc Fault, post-metamorphic and post-folding in age, and on the east by the...A N D D . R U M B L E III LEGEND / j ' 0 ^ ^ Vermont New Hampshire Border Sample Location Faults \~y-\\...[ j Partridge Formatiom 5 I ā 1 Ammonoosuc Volcanics 5 1 Oal | Albee Formation Ā£ X I 3 Olivenan Gneiss...map of west-central New Hampshire and adjacent Vermont depicting the general geology of the Orfordville |  | | Report (issue) | | (OH)2:05 : (2) Orfordville Formation, Mt. Cube quadrangle, Vermont, USA; by electron microprobe, corresponds...tremolite, arfvedsonite, magnesio-arfvedsonite, gedrite, glaucophane, quartz, garnet. Distribution: Well-characterized...Well-characterized material from: in the USA, at Cummington, Hampshire Co., Massachusetts; the Homestake...Lead, Pennington Co., South Dakota; in the Jackson County Iron Formation, Wisconsin. In the Wabush Iron Formation...For the occurrence at Cummington, Massachusetts, USA. References: (1) Dana, E.S. (1892) Dana's system |  | | Report (issue) | | deposits in the Glens Falls 1Ā° x 2Ā° quadrangle, New York, Vermont, and New Hampshire by J.F. Slack-i/...16-19, 1986. The Glens Falls 1Ā° x 2Ā° quadrangle (New York-Vermont-New Hampshire) is one of a number of...and related geology of the Glens Falls 1Ā° x 2" quadrangle. Because of time limitations, only representative...geologic maps are available for most of the stops in Vermont and New Hampshire, which are published (commonly...at 15-Minute scale) as part of bulletins of the Vermont Geological Survey, and, in New Hampshire, with |  | | Journal (article/letter/editorial) | | Wonesite:a new rock-forming silicate from the Post Pond Volcanics,Vermont FneNr S. Spean'. Ronpnr M. HazpN AND...r4(Alr534SL 466)8 0ooOro(OH,F)a in the Post Pond Volcanics,Vermont. The mineral is similar in optical, chemical...coexistswith phlogopite,talc, chlorite,cordierite, gedrite,anthophyllite, qvartz and plagioclase(An,o-ro)...Fe)uAlrSiuOro(OH)o has been discoveredin the Post Pond Volcanics,Vermont. The mineral is similar optically and...the Ordovician Post Pond Volcanics in the southwestcorner of the Mt. Cube Quadrangle, New Hampshire and |  | | Journal (article/letter/editorial) | | five-amphibole assemblage from blueschists in northern Vermont EucBNr A. Svrcr,rx, Davro R. VnnlnN Department...four-amphibole assemblagescommonly contain anthophyllite, gedrite, hornblende, actinolite, and cummingtonite in various...the Tillotson Peakareain north-central Vermont, near Tillotson Pond (seeFig. 4 in Bothner and Laird, 1987...five-amphiboleassemblagefrom Tillotson Pond area, northern Vermont Glaucoohane Tetrahedral Total Octahedral...been recognizedin our samplesfrom around Tillotson Pond. most cases,the highly calcic cummingtonite lamellae |  | | Journal (article/letter/editorial) | | Georgia Blue Ridge amphibolite unit with hornblende* gedrite * kyanite * staurolite TnoNrl.sS. Hnr,rvrs. Hl...amphibolites containing kyanite, staurolite, and gedrite have Mg-rich, olivine-normative basaltic compositions...assemblageis in reaction relation with gedrite + anorthite, hornblende + gedrite + kyanite, hornblende * corundum...coexistenceof hornblende * kyanite + staurolite + gedrite * plagioclase(Anr*-Anrr) in mafic rocks indicatesunusual...The Laurel Creek Mafic-Ultramafic Complex, Rabun County, Georgia Blue Ridge, is located approximately 5 |  | | Journal (article/letter/editorial) | | Copyright Ā© 1998 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/98 $19.00 1 .00 Pergamon...National Laboratory, Livermore, California 94550, USA Department of Geology and Geophysics, University...University of Wisconsin, Madison, Wisconsin 53706, USA 2 (Received July 29, 1997; accepted in revised form March...increasingly partition 18O in the order: hornblende ,, gedrite , cummingtonite # anthophyllite. The observed fractionations...coexist macroscopically in many rocks, including gedrite, anthophyllite, actinolite, cummingtonite, hornblende |  | | Journal (article/letter/editorial) | | protoliths for our samples are apparent altered mafic volcanics of Archean age. By far the most common assemblageis...samples containing coexisting anthophyllite and gedrite and severalcontaining almandine-rich garnet. T...50 'C higher I and similar P to the Post Pond Volcanics of Vermont, and 50 "C lower Z and several kbar...kbar lower P than the Ammonoosuc Volcanics in southwesternNew Hampshire. Analysesof coexistingcordierite...coexisting with cordierite and anthophyllite or gedrite provided clues to the behavior of this mineral |  | | Journal (article/letter/editorial) | | assemblages consisting of hornblende, cummingtonite, gedrite, anthophyllite, chlorite, garnet, epidote, clinopyroxene...staurolite-kyanite zone amphibolites in the Mt. Cube quadrangle, Vermont. The amphibolites there contain lowvariance...are similar to the amphibolites in the Mt. Cube quadrangle, Vermont (Spear, 1982) in metamorphic grade and...mineral assemblages from the Uvete area and Mt. Cube quadrangle. GEOLOGICAL SETTING AND CONDITIONS OF METAMORPHISM...+ + + + sph ~~ + rut + + + + + + il + + mt + + py Abbreviations: qtz = quartz; pl = plagioclase; |  | | Report (issue) | | Related Plutonic Rocks, and Mantling AmmonoosU;c Volcanics of the Bronson Hill Anticlinorium, New England...Related Plutonic Rocks, and Mantling Ammonoosuc Volcanics of the Bronson Hill Anticlinorium, New England...and mantling but chemically distinct Ammonoosuc Volcanics and related trondhjemite is interpreted to indicate...related plutonic rocks, and mantling Ammonoosuc Volcanics of the Bronson Hill Anticlinorium, New England...Mountain, and Waits River Formations.... Ammonoosuc Volcanics and Related Rocks . . . . . . . . . . . . . . |  | | Journal (article/letter/editorial) | | MassachusettsInstituteof Technology,Cambridge,Massachusetts02139, USA Abstract. The exchange equilibrium between plagioclase...localities in the metamorphosed Post Pond Volcanics, New Hampshire and Vermont; and (2) analyses from numerous...numerous literature sources. The first of the Post Pond Volcanics localities is a roadcut along U.S. Route...Route 5 in the south-west corner of the Mt. Cube Quadrangle, Vt. Phase relations of the amphibolites and data...ilmenite +_garnet + cummingtonite + ant'hophyllite+ gedrite + staurolite. Temperature estimates based on 160/180 |  | | Journal (article/letter/editorial) | | examples. Key words: anthophyllite; ferric iron; gedrite; NCKFMASHTO; pseudosection; whiteschist. Mineral...cummingtonite; di, diopside; ep, epidote; g, garnet; ged, gedrite; gl, glaucophane; H2O, aqueous ļ¬uid; hb, hornblende;...ky, kyanite; law, lawsonite; liq, silicate melt; mt, magnetite; mu, muscovite; oam, orthoamphibole; opx...is one of the diagnostic distinctions between gedrite and anthophyllite (Robinson et al., 1971, 1982;... Na has to be included in the model system if gedrite is involved, or if coexisting orthoamphibole and |  | | Journal (article/letter/editorial) | | type locality is the Carlton quarry near Chester, Vermont (Clements and Robinson 1996; Gait and Veblen 1996;...the alteration of orthohombic amphibole. WHO VERMONT MINERALS Named for James B. Thompson, Jr. and David...by the rocks and minerals of New Hampshire and Vermont. Later, at Massachusetts Institute of Technology...significant contribution to the geological map of Vermont. It was here, no doubt, that he developed his love...the Post Pond Volcanics, Vermont, associated with phlogopite, talc, chlorite, cordierite, gedrite, anthophyllite |  | | Journal (article/letter/editorial) | | Plagioclase Orthoclase Hornblende Cummingtonite Gedrite Anthophyllite Biotite Garnet Augite Orthopyroxene...Tracy etal., 1976), pink or tan. In Zones I-IV, gedrite is pink to pinkish most garnet in the amphibolites...57-690/o,pygardlessof the presenceof magnetite. Gedrite in antho- rope l1-310/0,grossular2-20o/o,and spessartine2-160/o...anthophyllite. The occurrence of the three-phasefield with gedrite, cummingtonite, and garnet in Massachusettsis further...Fig. 87), which requiresa three-phasefield with gedrite and garnet below the tie line. Reaction 3 can be |  | | Journal (article/letter/editorial) | | te and the orthoamphiboles, anthophyllite and gedrite. The clinoamphibole model in NCMASH is adopted...end-members anthophyllite, ferroanthophyllite and gedrite, are used; for the others, they are based on the...ged, gedrite; gl, glaucophane; hb, hornblende; hem, hematite; ilm, ilmenite; law, lawsonite; mt, magnetite;...Table 2. Natural data of coexisting gedrite and anthophyllite. Gedrite Reference 1 2 2 3 4 4 4 4 4 5 5 5...of end-members in NCMASH is anthophyllite and gedrite and the ļ¬ctive end-members orthomagnesiopargasite |  | | Journal (article/letter/editorial) | | glaucophane from eclcgite assemblagesin northern Vermont have been studied using transmission and analytical...ferromagnesianamphiboles and in the orthoamphibole (gedrite-anthophyllite) systemhasbeenwidely reported,and...localityknown as Eclogite Brook in north-central Vermont (seeFig. 5 in Bothner and Laird, 1987). They belong...unravel the complicated polymetamorphic history of Vermont. From their analysis, they have identified four...metamorphism affecting the Paleozoic rocks of Vermont (seeLaird and Albee, l98lb, Table 3, p. 160-16l) |  | | Journal (article/letter/editorial) | | clinopyroxenes. The thermodynamics of orthoamphibole (gedrite) is also adjusted to resolve an unrelated inconsistency...calculated occurrence of Ca-poor hornblende (clino-gedrite) in banded-iron formation. Clinogedrite has never...been documented in rocks and is metastable to gedrite in natural systems, which suggests that the interplay...following section. The interplay of hornblende and gedrite The only chemical distinction between the clinoamphibole...clinoamphibole, hornblende, and the orthoamphibole, gedrite, is in terms of the occupation of the M4 site in |  | | Journal (article/letter/editorial) | | J. metamorphic Geol., 1996, 14, 739ā753 Gedriteāgarnetāsillimanite-bearing granulites from Amessmessa...Ouzzal unit, Hoggar) contain the peak assemblage gedrite+garnet+sillimanite+quartz that was used to estimate...granulites from the north of In Ouzzal. Key words: gedrite; granulite; Hoggar, In Ouzzal; Precambrian; PāT...elongated (Haddoum, 1992; Haddoum et al., 1994). The gedriteāgarnetāsillimanite-bearing granulites, which are...metabasic rocks. Only a few occurrences of the gedriteāsillimanite association have been reported in the |  | | Journal (article/letter/editorial) | | mechanismsin the orthoamphibolesanthophyllite and gedrite EucBNn A. Snnnr,rx.x Dalro R. Vnsr,pN Department...in 17 orthoamphibole samples (anthophyllite and gedrite) has been carried out using transmission and analytical...program, EPLAG, for intergrown anthophyllite and gedrite indicate that the combination of Ab and Aa between...analysesof exsolved pairs of anthophyllite and gedrite indicate that edenite and tschermakite substitutions...place between 460 and 520 "C. thophyllite and gedrite, which have led to a rather complete delineation |  | | Journal (article/letter/editorial) | | Mineral. v. 9B, p. 1-228. Spear, F. S., 1980, Th e gedrite-anthophyllite solvus and the composition limits...limits of orthoamphibole from the Post Pond Volcanics, Vermont: Am. Mineral., v. 65, no. 11, p. 1103-1118...of amphibolites from the Post Pond Volcanics, Mt. Cube Quadrangle, Vermont: Jour. Petrol. v. 23, no..... 2 3 , . 7 5 , 1 8 . B g , 0 , 0 , O FL,,'RI-GEDRITE 80 L A L A N D M O O R E H O U S E (1989) 2 01...215 0.215 0.000 0.004 0.004 0.228 0.306 FERRI-GEDRITE 80 LAL AND MOOREHOUBE (1969) LOWER BOUND = SUM |  | | Journal (article/letter/editorial) | | Institute of Technology, Cambridge, Massachusetts 02139, USA Abstract. Equilibria between plagioclase, calcic...calc-silicates from the Ammonoosuc and Post Pond Volcanics, New Hampshire and Vermont, and the Littleton Formation...middle garnet-oligoclase zone come from a quarry on Mt. Finish near Lebanon, New Hampshire and have been...the staurolite isograd come from the Ammonoosuc Volcanics on the north and west flank of the Mascoma dome...this locality is slightly higher than that of the Mt. Finish Quarry, these two areas are believed to represent |  | | Journal (article/letter/editorial) | | kyanite, sillimanite, staurolite, cordierite and gedrite (i.e. aluminous orthoamphibole). Whereas the presence...greenstones and amphibolites from Vermont, which occur as dykes or volcanics of dominantly tholeiitic affinity...staurolite, cordierite, garnet, anthophyllite, gedrite, biotite or phlogopite, muscovite, phengite or...Orthoamphibole Anthophyllite Ferroanthophyllite Gedrite Hornblende Tremolite Ferrotremolite Tschermakite...with I =24 kJ to simulate ged,oa anthophyllite-gedrite solvus; 5 Ideal mixing on sites with I =120ā0.15T |
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