 | | Report (issue) | | Geology of the Old Speck Mountain Quadrangle, Maine by Daniel Jeremy Milton Cambridge^ Massachusetts...Thickness ..................... ,/ Ananonoosuc volcanics .................. 20 20 General statement ...Sphene-flecked diorite from Maine. ............. A-l Gedrite from Oxford County, Maine. ............. B-l.......... Ik 2. Estimated modes of the Ammonoosuc volcanics. ...... 22 5. Estimated modes of the...the kyanite schist member of the. . . Ammonoosuc volcanics .. .............. 55 4. Composition of kyanite |  | | Report (issue) | | Related Plutonic Rocks, and Mantling AmmonoosU;c Volcanics of the Bronson Hill Anticlinorium, New England...Domes, Related Plutonic Rocks, and Mantling Ammonoosuc Volcanics of the Bronson Hill Anticlinorium, New England...gneisses, and mantling but chemically distinct Ammonoosuc Volcanics and related trondhjemite is interpreted...domes, 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) | | (GAM)-Quartzite Member of the Ammonoosuc Volcanics from southern New England, USA. Based on stratigraphic and...evidence, earlier workers interpreted the Ammonoosuc Volcanics as part of a volcanic island-arc complex...conditions (6 kbar and 580–640 °C). Within the Ammonoosuc Volcanics, a finegrained, garnet-, magnetite-, and...one or more of the amphiboles cummingtonite, anthophyllite, or hornblende. In the most recent investigations...te, hornblende–orthoamphibole, and gedrite–anthophyllite series (Robinson et al. 1971) was an extension |  | | Field Trip Notes | | West-Central Maine DISCLAIMER Before visiting any of the sites described in the New England Intercollegiate...GEOLOGICAL CONFERENCE FIELD TRIPS IN WEST- CENTRAL MAINE Andrew Griscom Daniel J. Milton, s U. So Geological...Survey U. S. Geological Survey Editors Rumford, Maine October 8-9, I960 I ! CONTENTS Page Introduction...Quadrangle, Maine Leader: Trip B. Stratigraphy and General Geology to Phillips, Maine. Leader: Trip...Mineralogy of Pegmatites of the Newry Hill Area, Newry, Maine Leader: 19 Calwell Geology of the Old Speck Mountain |  | | Report (issue) | | from the roadlog of Thompson (1972). In the Orange County copper district, the stops and descriptions in...after 1-89 exit, which is in the Ammonoosuc Volcanics (Post Pond Volcanics) of Ordovician age. 39.8 Cross...apparently intrudes Middle Ordovician (450 Ma) Ammonoosuc Volcanics, and developed a metamorphic foliation during...metamorphosed basalt and rhyolite of the Ammonoosuc Volcanics, which mantle this (and most other) Oliverian...block probably originated from an outcrop of Ammonoosuc Volcanics above, and was dislodged during construction |  | | Journal (article/letter/editorial) | | (see Fig. 1). It is bounded on the west by the Ammonoosuc Fault, post-metamorphic and post-folding in age...unconformity — [ j Partridge Formatiom 5 I — 1 Ammonoosuc Volcanics 5 1 Oal | Albee Formation £ X I 3 Olivenan...correlating the Post Pond volcanic member with the Ammonoosuc Volcanics and the black-schist member with the Partridge...truncated to the west by the post-metamorphic Ammonoosuc fault. There is an abrupt discontinuity in metamorphic...diversity of CambroOrdovician metasediments and meta-volcanics than does the Bronson Hill (Hadley, 1942). Furthermore |  | | Report (issue) | | Hill Formations ...................... 10 Ammonoosuc Volcanics and Middletown Formation ............. ............................... 31 Monson and Ammonoosuc ................................ 31 Oliverian............. 5A-B 3. Monson Gneiss and Ammonoosuc Volcanics.............. 13A-B k. Structures and...Glastonbury Gneiss, Monson Gneiss, and felsic Ammonoosuc Volcanics..................... 6. 28A-B Normative...Glastonbury Gneiss, Monson Gneiss, and fel sic Ammonoosuc Volcanics......................... 1*4 $ [QJ~ 2. |  | | Journal (article/letter/editorial) | | staurolite-kyanite-zoneamphibolites of the Ammonoosuc Volcanics near Hanover, New Hampshire. The amphibole...studied were collected from the Middle Ordovician Ammonoosuc Volcanicsin westcentralNew Hampshire.Specifically...staurolite-kyanite zolae (Thompsonet al., 1968). The Ammonoosuc Volcanics consist primarily of fine-grained amphibolites...(l97la) for the calcic amphiboles and related anthophyllite-gedriteseries. Analyses of coexisting cummingtonite...glauhornblende,glaucophane-hornblende, and anthophyllite-gedrite (Klein, 1969), cophane 514 IOHN B |  | | Journal (article/letter/editorial) | | Gedrite-Cordierite-Gneiss from Southwestern New Hampshire, USA by JOHN C. SCHUMACHER1 AND PETER ROBINSON 2 1 (Received...gedrite-cordierite-gneisses of the Middle Ordovician Ammonoosuc Volcanics, and are composed of combinations of the...Petrology, VoL 28, Put 6, pp. 1033- 1073, 1987] © Oxford Ummnty Prc» 1987 Downloaded from http://petrology...s that is part of the Middle Ordovician Ammonoosuc Volcanics. Samples used in this study were collected...the Keene gneiss dome, southwestern New Hampshire, USA (Fig. 1). The distinctive gedrite-cordierite-gneisses |  | | Journal (article/letter/editorial) | | protoliths for our samples are apparent altered mafic volcanics of Archean age. By far the most common assemblageis...assemblageis quartz + plagioclase * cordierite + anthophyllite + biotite + ilmenite, although we observed five...five samples containing coexisting anthophyllite and gedrite and severalcontaining almandine-rich garnet...Pond Volcanics of Vermont, and 50 "C lower Z and several kbar lower P than the Ammonoosuc Volcanics in...cummingtonite coexisting with cordierite and anthophyllite or gedrite provided clues to the behavior of |  | | Report (issue) | | Acknowledgments Regional geology Monson Gneiss Ammonoosuc Volcanics Partridge and Collins Hill Formations Glastonbury...relationships Lithologic character Major elements Ammonoosuc Volanics and Monson Gneiss Glastonbury Gneiss...Glastonbury dome 3-5. Photographs of 3. Ammonoosuc Volcanics and Monson Gneiss 4. Monson Gneiss showing...Gneiss, Monson Gneiss, and felsic layers of Ammonoosuc Volcanics 7. Photographs of structures and textures...of Glastonbury Gneiss, Monson Gneiss, and Ammonoosuc Volcanics Trace-element and Sr-isotope data for Glastonbury |  | | Journal (article/letter/editorial) | | gedrite-anthophyllite solvusand the composition limits of orthoamphibote from the Post Pond Volcanics,Vermont...low Al-Na anthophyllites) from the Post Pond Volcanics, Vermont, display a variety of textures that are...gedrite than in anthophyllite, which suggeststhat the solvus is steeperon the anthophyllite limb. The solvus...widest gap. Distribution of elementsbetween anthophyllite and gedrite is systematic,with gedrite enriched...in Alrv, AlvI, Fe2*, Na, Ti Ca, and Mn and anthophyllite enriched in Si and Mg. The composition timits |  | | Journal (article/letter/editorial) | | FRANCESTOWNSMALLSFALLS PERRYMTN. RANGELEY PARTRIDGE Late AMMONOOSUC Ordovician PLAGIOCLASE GNEISSES GNEISS Late MICHOCLINE...several quartzite localities at the base of the Ammonoosuc, and most recently as a possibledetachmentfault...unit ofthe Ordovician cover sequenceis the Ammonoosuc Volcanics, long thought to be Ordovician on the basis...less than 30 m to more than 1000 m, the Ammonoosuc Volcanics contain a detailed and complex stratigraphic...chemically similar to those of the underlying Ammonoosuc Volcanics (Hollocher, 1985). The Partridge has also |  | | Report (volume) | | Formation and a Dike Cutting the Standing Pond Volcanics, Southeastern Vermont John N. Aleinikoff and Paul...Elements in the Vicinity of Mount Ascutney, Windsor County, Vermont Leslie J. Cox CHAPTER 0 Carbonate-Hosted...and Heavy-Mineral Concentrates from the Orange County Copper District, East-Central Vermont John F. Slack...northeast in northern New Hampshire and west-central Maine. S.H.B. Clark describes the sediment-hosted, stratabound...t"' 45°00' ! - = - - - OGDENSBURG- ~/" / I \MAINE 44 ooo·lrun:r:;;rc~A----+--'----*="=::--:-;='-----1 |  | | Journal (article/letter/editorial) | | the evolution of natural examples. Key words: anthophyllite; ferric iron; gedrite; NCKFMASHTO; pseudosection;...act, actinolite; als, aluminosilicate; anth, anthophyllite; bi, biotite; cd, cordierite; chl, chlorite;...diagnostic distinctions between gedrite and anthophyllite (Robinson et al., 1971, 1982; Stout, 1972; Spear... chloritoid, cordierite, staurolite, talc, anthophyllite, gedrite, cummingtonite, orthopyroxene, the...presented in Fig. 1. Although both gedrite and anthophyllite were considered in the calculations, only one |  | | Report (issue) | | Formation are tentatively correlated with the Ammonoosuc Volcanics and the Monson-Fourmile Gneisses of the...northwest Maine (Harwood and Berry, 1967) and a lateral correlation with the Ammonoosuc Volcanics in the...establishing possible lithic correlation with the Ammonoosuc Volcanics and the Monson or Fourmile Gneiss in the...Rusty-weathering massive granulites that contain abundant anthophyllite(?) and tourmaline and that commonly have deep...considered to be approximately equivalent to the Ammonoosuc Volcanics of the Bronson Hill anticlinorium. The homogeneous |  | | Journal (article/letter/editorial) | | hornblendes.Due to the presenceof a solvus between anthophyllite and gedrite below ca. 600'C (Spear, 1980b)four...off-solvus anthophyllites, solvus pairs of anthophyllite and gedrite, supersolvusorthoamphiboles,and...conditions. Their gedrite contains exsolved anthophyllite and must at least have intersected the solvus...orthoamphibolesincreases,varying from a vacant A-site in anthophyllite to an almost completely filled A-site in the...threeamphiboleassemblagefrom the Tallan Lake sill, Peterborough County, Ontario. CanadianMineralogist, 18, 275-284. James |  | | Journal (article/letter/editorial) | | microstructures in 17 orthoamphibole samples (anthophyllite and gedrite) has been carried out using transmission...lattice fitting program, EPLAG, for intergrown anthophyllite and gedrite indicate that the combination of...Fe/Mg ratio. AEM analysesof exsolved pairs of anthophyllite and gedrite indicate that edenite and tschermakite...Princeton,New Jersey08544, structures between anthophyllite and gedrite have also U.S.A. been studied extensively...of immiscibility between the orthoamphiboles anthophyllite and gedrite were first observed in the early |  | | Report (issue) | | GEOLOGIC RADON POTENTIAL OF EPA REGION 1 Connecticut Maine Massachusetts New Hampshire Rhode Island Vermont...GEOLOGIC RADON POTENTIAL OF EPA REGION 1 Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and...Preliminary Geologic Radon Potential Assessment of Maine Linda C.S. Gundersen andR. Randall Schumann 83...aerial radioactivity, and indoor radon data by county. Because of constraints on the scales of maps presented...The reports are available in county formats and State summaries. The county reports typically contain both |  | | Journal (article/letter/editorial) | | Pyriboles that consist of mixed double chains (anthophyllite), alternating double and triple chains (chesterite)...decreasein the jimthompsonite relative to the anthophyllite. These chemical variations can be explained...(dM) and regular octahedral (rM) sites of the anthophyllite and the jimthompsonite, the differing proportions...Chesterite-like lamellae have been reported in anthophyllite (Cresseyet al., 1980), and triple-chain lamellae...silicates.This locality, well known for cordierite-anthophyllite and the site of sulfide mineralization, representsa |  | | Book (volume) | | Mineralogy by Vandall T. King and Eugene E. Foord Maine Geological Survey DEPARTMENT OF CONSERVATION Walter...Resources Information, Maine Geological Survey Walter A. Anderson, State Geologist Maine Geological Survey...DEPARTMENT OF CONSERVATION 1994 Copyright ©1994 by the Maine Geological Survey, Department of Conservation. All...photograph: Fluorapatite, Pulsifer quarry, Auburn, Maine (2.2 cm specimen), Harvard Mineralogical Museum...Wendell E. Wilson, ©1985. The laws and policies of Maine and the United States prohibit discrimination in |  | | Report (issue) | | ...........................................122 Maine ..................................................early-formed tremolite has been partially replaced by anthophyllite, serpentine, and talc. Introduction The United...New Hampshire (175)) is less common, as is anthophyllite (Balmat, New York (180-183), and Dalton, Massachusetts...Blackwall chlorite rock Tremolite rock 14 anthophyllite, or hornblende. Finally, the outer edge of the...serpentinites, particularly tremolite-actinolite, anthophyllite, phlogopite, chromian magnetite, and hematite |  | | Journal (article/letter/editorial) | | 2005, 17, 57-68 Metamorphic evolution of anthophyllite/cummingtonite-cordierite rocks from the upper...assemblage containing sillimanite, staurolite and anthophyllite, which are found as microinclusions in cordierite...matrix by a medium to low-pressure assemblage of anthophyllite, cordierite and garnet. The second type is represented...uppermost unit of the Ordenes Complex, in which the anthophyllite-cummingtonite rocks are located, appears to...process. Key-words: metamorphic evolution, anthophyllite, cummingtonite, cordierite, low-Ca amphibolites |  | | Journal (article/letter/editorial) | | orthoamphibolecompositionalvariation and the nature of the anthophyllite-gedritesolid solution series have received considerablestudy...t945-1972. Rabbitt, J. C. (1984) A new study of the anthophyllite series. American Mineralogist, 33, 263-323....comparisons of gedrite and hornblende, and the anthophyllite-gedrite solvus. American Mineralogist, 56, 1005-1041...extreme Al and Na conrenr rn the metamorphosed Ammonoosuc Volcanics, sillimanitestaurolite zone, central Massachusetts...gedrite-anthophyllite solvus and the composition limits of orthoamphibole from the Post Pond Volcanics, Vermont |  | | Journal (article/letter/editorial) | | Institute of Technology, Cambridge, Massachusetts 02139, USA Abstract. Equilibria between plagioclase, calcic...Amphibolites and calc-silicates from the Ammonoosuc and Post Pond Volcanics, New Hampshire and Vermont, and the...from the staurolite isograd come from the Ammonoosuc Volcanics on the north and west flank of the Mascoma...associated minerals in some schists from Vermont, USA and south Westland, New Zealand, with inferences...equilibria of amphibolites from the Post Pond Volcanics, Vermont. Carnegie Inst Washington Yearb 76:613-619 |
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