 | | Journal (article/letter/editorial) | | POPULATIONS FROM THE PRECAMBRIAN BASEMENT OF THE MARYLAND PIEDMONT B. GRAUERT Department of Terrestrial...Carnegie Institution of Washington, Washington, D. C. (USA) Received April 9, 1974 Revised version received...Baltimore Gneiss, the Precambrian basement in the Maryland Piedmont. Eight gneiss and migmatite samples were...a complex Grenville metamorphic history in the Maryland and Pennsylvania Piedmont, that lasted from at...gneiss complex, the Precambrian basement of the Maryland Piedmont, reflects the major metamorphic events |  | | Report (issue) | | Ridge province in West Virginia, Pennsylvania, and Maryland (Trip 3); Eocene volcanic rocks that intrude Paleozoic...metamorphic rocks of the eastern Piedmont province in Maryland and Virginia (Trip 5); the use of cosmogenic isotopes...Piedmont province near Great Falls, Virginia and Maryland (Trip 6); the nature of the boundary between rocks...strata around the Chesapeake Bay of Virginia and Maryland (Trip 9). Some of the field trips present new...Appalachian Piedmont, Northern Virginia and Southern Maryland By Michael Kunk, Robert Wintsch, Scott Southworth |  | | Journal (article/letter/editorial) | | 2927 F 3 and 2928 F 2 Ma, for the homogenous Woodstock and Mulgandinnah Monzogranite plutons in the Yule...zones. The first area is part of the K-feldspar porphyritic Woodstock Monzogranite that is located just...detail below. 3.1. The Woodstock Monzogranite — observations The Woodstock Monzogranite is a syn-tectonic...magmatic foliation defined by the alignment of K-feldspar phenocrysts was also developed at this time (Fig...127–139 Fig. 2. Geological map of the eastern Woodstock Monzogranite (location a on Fig. 1), showing the |  | | Report (issue) | | evolution of the Baltimore Gneiss anticlines, Maryland Peter D. Muller and David A. Chapin Southern and...central Virginia ee ee eee ORNS eee i FVein.) A. K. Sinha and M. J. Bartholomew OOS UNC Grice ait ...near Philadelphia; the Baltimore Gneiss domes of Maryland; and the Sauras Massif of North Carolina. Still...Melcher, G. C., Cordani, V. G., Rand, J. R., Kawashita, K., Vandoros, P., Pinson, W. H., and Fairbairn, H. W...and Member E, only locally present, is a quartz-feldspar granulite. To the east, the Gouverneur Marble |  | | Journal (article/letter/editorial) | | very slight effects to complete equilibration of K-feldspars during metamorphism. In one case, lead and...of foliated gneissic granite near Moolyella (3125 k 366my), and a better fitted isochron with an age of...in amount. becoming more common in 1543. The Woodstock outcrop occurs as a railroad cut where the railroad...were 206/207 = 1.0929 + 0.00019 and 206/204 = 16.947 k 0.0028; the errors quoted are 1 e for the population...rocks and minerals except the pegmatitic (1553) K-feldspar. Concentration data show that the amount of lead |  | | Report (chapter) | | Article Terrane is limited to the northwest by the Woodstock Fault across which lies the Late Ordovician to...consists of the Cambrian to Early Ordovician Woodstock Group and the Early Ordovician to Middle Ordovician...Mountain gold occurrence, which is located in York County in western New Brunswick (Fig. 1), is one of the...ult Fa 100 km d Me Canterbury Basin Po kio Ba k G r tho a n lith ite M ira m PM VC D3-P O3-D1...geophysical data, is proximal and parallel to the Woodstock Fault (Fig. 1). No direct contact between the |  | | Report (volume) | | members of the James Run Formation, Cecil County, northeastern Maryland, by Michael W. Higgins ---------------------The...---------------------The Baltimore Complex, Maryland and Pennsylvania, by Michael W. Higgins -------------------...Cretaceous) to replace the Monmouth Formation in Maryland, by James P. Minard, Norman F. Sohl, and James...Arizona -----Generalized geologic map of Cecil County, Md., showing members of the James Run Formation...map showing extent of the Baltimore Complex in Maryland and Pennsylvania _._____ Map showh:tg reference |  | | Journal (article/letter/editorial) | | &SAllY (•) (• CLARKS LAKE i•) (•) EAGLELAKE (•) • WOODSTOCK O Q GASPE MARINER [] I• EVANDALE [] ALMA RENCONTRE...Intrusion closeto ore Sally Mtn Catheart Clarks Lake Woodstock Gasp• Evandale (Hampstead) Eagle Lake Mariner...monzonitefor thesetwo deposits. Appalachians. The Woodstock porphyry copper mentionedby Potter (1970, 1973)...porphyritictexturesfound at Catheart, Sally, RencontreEast, and Woodstock,the in- The core of nearly all Appalachianorogenporphyry...both orogenssulfide If volcanicsaccompaniedthe Woodstock, Eagle occurs sparsely as a fracture filling and |  | Chi, G, Watters, S, Davis, WJ, Ni, P, Castonguay, S, Hoy, D (2008) Geologic, geochemical, and geochronological constraints on the genesis of gold mineralization at Poplar Mountain, Western New Brunswick, Canada. Exploration and Mining Geology, 17 (1-2) 101-130 | Journal (article/letter/editorial) | | located along the southern segment of the regional Woodstock fault zone. The PMVC consists of three principal...ted alteration is characterized by enrichment of K, Rb, Cs, Ca, Sr, Ba, As, Sb, W, C, and S. Fluid inclusion...were focused along structures related to the Woodstock fault. The Poplar Mountain gold occurrence might...segment sud de la zone de faille régionale de Woodstock. Les trois unités principales du CVPM sont, de...minéralisation est caractérisée par un enrichissement en K, Rb, Cs, Ca, Sr, Ba, As, Sb, W, C, et S. Les inclusions |  | | Book | | UNIVERSITY MARYLAND F, J. PETTIJOHN JOHNS HOPKINS BALTIMORE, UNIVERSITY MARYLAND J. C., REED...COLORADO and KENNETH MARYLAND BALTIMORE, N. WEAVER GEOLOGICAL SURVEY MARYLAND INTERSCIENCE PUBLISHERS...OWENS, James P., 14528 Bauer Drive, Rockville, Maryland 20853. PETTIJOHN, RANKIN, DOE, Bruce, Isotope...Department of Geology, Johns Hopkins University, Maryland 21218. Doucias Baltimore, W., Eastern States...Geology, Johns Hopkins University, Baltimore, Maryland 21218. GWINN, Vinton E., Department of Geology |  | | Journal (article/letter/editorial) | | in G rear Britain FORMATION OF HALLOYSITE FROM FELDSPAR: LOW TEMPERATURE, ARTIFICIAL WEATHERING VERSUS...products, which first appear as tiny bumps on the feldspar surface, start to develop mainly at exposed edges...weathering continues, the bumps grow outward from the feldspar surface to form tapered projections, which then...tubes that are inclined at a high angle to the feldspar surface. Etch pits of triangular outline on the...sheets formed on artificially weathered plagioclase feldspar do not develop into hollow tubes, but instead |  | | Journal (article/letter/editorial) | | regime. Results for the nearby Clutha, Albion and Woodstock mines are similar. This study suggests that gold...transected by thrust faults including: Albion (AF), Woodstock (WF), Lily (LF) and Kaap River (KRF) faults, and...major shear zones including the Lily, Albion, Woodstock and Kaap River faults (Figure 1), which act as...fluids have been related to spodumene, albite and K-feldsparbearing pegmatite intrusions (e.g. Harris...7161250) and along road and rail sections N of Woodstock Mine (GR 308140 to 7159150) (Figure 1). Along |  | | Book (volume) | | greater variety of minerals are found in Oxford County, alone, than anywhere else on Earth of comparable...than Maine's, as well. An area smaller than Oxford County in Murmansk Ob last, Kola Peninsula, Russia, has...clear to slightly blue topazes. However, San Diego County, California, is arguably the most important gem-pegmatite...Museum der Stadt Bern, Bern, Germany, 143 p. Vlasov, K. A., Kuz'menko, M. Z., and Es'kova, E. M., 1966, The...Lovozero alkali massif, translated by D. G. Fry and K. Syers; edited by S. I. Tomkeieff and M. H. Battey: |  | | Journal (article/letter/editorial) | | northwest part of the Bass Lake quadrangle, Mariposa county, california. The mineral is not zoned, but does...the ilmenite occurs gives: qtartz, 43 percent; K-feldspar, 23 percent; plagioclase, 30 percent; ferromagnesian...features of interest. PenecpNnsrs Ilmenite cutting K-feldspar was noted in a sample of the adamellite; this...MineraL. Petrog. Mitt., Neues FolgeB, 12-15. Ouonr, K., aur S. Hnsnoewa (1955) Chemical composition of perthite...Sons, New York. Snnnsow, E. S. (1929) Ilmenite, Woodstock, N. W. Div., and Wannamal, S. W. Div. Cont. M |  | | Journal (article/letter/editorial) | | (Fig. 1) is a major contributor to Australia’s feldspar production, and adjacent pegmatites have been...Australia Marble Bar S Yi CD Y T SH Nullagine K Phanerozoic Greenstone sequences Mt. Bruce Supergroup...Corunna Downs, CH = Chiratta, D = Dampier, H = Harding, K = Kurrana, ME = Mount Edgar, MU = Muccan, P = Pippingarra...Mallina Basin Greenstone belt Sn-Nb-REE Sn K-Feldspar Whim Creek Grp. Granitoid-gneiss terrane Nb-Ta-Be... and sills of simple mineralogy (i.e., quartz-feldspar-mica ± tourmaline ± garnet) that have accompanied |  | | Journal (article/letter/editorial) | | They also applied the same two-stage model to K-feldspar Pb's which represent the initial isotopic composition...composition of Pb in acid intrusive rocks. For K-feldspar Pb's, the scatter was much greater, and the discrepancies...large number of individually complex systems. The K-feldspars represent Pb from only one or two individual...generations of minerals in the rock. Lead isotopic data on K-feldspars from the South African rocks is very limited...However, let us examine the consequences if these K-feldspar Pb's truly reflect the initial isotopic composition |  | | Journal (article/letter/editorial) | | of the Molong Geanticline. In the Wellington-Woodstock region, intermediate and mafic volcanism characterizes...sericite, and carbonate. Albite is common on primary feldspar sites but oligoclase relics are present in scattered...are: albite (both as new growths, and on primary feldspar sites), quartz, chlorite, epidote, and carbonate...mica sphene carbonate hydrogarnet biotite 9 k-feldspar 7 Relict phases clinopyroxene hornblende _...both in the matrix and within albite on primary feldspar sites. Carbonate occurs in small amounts in the |  | | Book (volume) | | Duane L. Leavitt The Bennett Pegmatite, Oxford County, Maine . ........................................permanent photographic exhibits in the northeastern USA. The Shaubs have been active in ornithological research...tourmalinebearing Himalaya pegmatite at Mesa Grande, San Diego County, California. Most recently, Gene was gratified...Maine's treasure chest; Gems and minerals of Oxford County, second edition: Quicksilver Publications, West...Resources, Olympia, Washington Woodstock Historical Society, Woodstock, Maine Yale University Library |  | | Journal (volume) | | 11:30 10. Gilbert Riley: Deformation of quartz and feldspar in a Precambrian granulite .......... .11:50 Poster...magnetite deposits in the Mineville District, Essex County, New York was studied for rare earth abundances...for SiO, A1 20 31 Ti0 21 FeO, MgO, MnO, CaO, Na 2O, K 2 O, P 2 O 5 , BaO, Cr 2O 3 , Ni, Nb, Zr, Y, Sr, Rb...phyllitic beds and stacking of dismembered quartz/feldspar veins. Microprobe and microscope work revealed...weakly foliated Mount Holly quartz-feldspar gneiss. A distinctive feldspar augen gneiss and biotite rich gneiss |  | | Journal (article/letter/editorial) | | the Tottenhamdeposits, whichare hosted Potassium feldspar wasalsoanalyzed in an attemptto de- measured possibly...rocks, non-shoshonitic O-W = Orange-Wellington Belt; K - Kiandra Belt FIG.1. Mapshowing thelocation of deposits...intrusions intothe Ordovician Fairbridge Volcanics. A K-Ar PbSIGNATURES OF MINERALIZATION, LACHLANFOLD BELT...hasbeenmeasured in a groupof samples fromthree Woodstock copperdistrictlocatedin the EarlyOrdovicianoftheGoonumbla...END•VOUR26 PORPHYRY J e •KE COWAL DEPOSES / I P•K HILL / = COPPERH•LL /* / • with the Allibone(1992) |  | | Journal (issue) | | and Leslie Hindman Auctioneers, Chicago, Illinois, USA (4.02 ct gem); photo by Orasa Weldon. Accredited...Edward Boehm, RareSource, Chattanooga, Tennessee, USA; Alan T. Collins, King’s College London; John L....Emmett, Crystal Chemistry, Brush Prairie, Washington, USA; Emmanuel Fritsch, University of Nantes, France;...E. Post, Smithsonian Institution, Washington DC, USA; Andrew H. Rankin, Kingston University, Surrey; George...Rossman, California Institute of Technology, Pasadena, USA; Karl Schmetzer, Petershausen, Germany; Dietmar Schwarz |  | | Report (issue) | | George Washington University Washington, D.C. 20052 USA Louise Corriveau Geological Survey of Canada GSC-Québec...Skidmore College Saratoga Springs, New York 12866 USA Mervin J. Bartholomew Department of Earth Sciences...Tennessee 38152 USA Memoir 197 3300 Penrose Place, P.O. Box 9140 ■ Boulder, Colorado 80301-9140, USA 2004 MWR197...Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA. Copyright is not claimed on any material prepared...Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA www.geosociety.org Printed in U.S.A. GSA Books Science |  | | Book | | Deposits of the Caribbean . INTRODUCTION . . oP A ha e k GEOLOGIC SETTING . . . PORPHYRY COPPER DEPOSITS CONCLUSIONS...cited ume contains from 35% to 65% potassuim feldspar and at least 10% quartz. A term used in this volume...Rocks N Porphyry with Stocks Sulfides 200 K,0 INDEX K,0x 109 SiQ,-42.5 150 100 50 60 100 180...further east than Paramillos Sur. If potassium-argon (K-Ar) dating is to be believed, the erratic distribution...: sar eras Peres ID, K 4,‘ ; MME Den» i. iG oe fly 23 3 a oe my |  | | Journal (article/letter/editorial) | | from this unit, which is characterised by large K-feldspar phenocrysts which, along with biotite crystals...percentage of the rock and it contains abundant K-feldspar phenocrysts. Blocks of the grey granodiorite...complex. It contains abundant phenocrysts of K-feldspar and it is easily distinguished from the other...indicated by the presence of subhedral to euhedral K-feldspar phenocrysts and plagioclase crystals, and coarse-grained...quartz; (Pl) plagioclase; (Bt) biotite; and (Kf) K-feldspar. 2.4. Biotite granodiorites Two biotite granodiorite |  | | Journal (article/letter/editorial) | | from this unit, which is characterised by large K-feldspar phenocrysts which, along with biotite crystals...percentage of the rock and it contains abundant K-feldspar phenocrysts. Blocks of the grey granodiorite...complex. It contains abundant phenocrysts of K-feldspar and it is easily distinguished from the other...indicated by the presence of subhedral to euhedral K-feldspar phenocrysts and plagioclase crystals, and coarse-grained...quartz; (Pl) plagioclase; (Bt) biotite; and (Kf) K-feldspar. 2.4. Biotite granodiorites Two biotite granodiorite |
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