 | | Report (issue) | | the cover—Turquois crystals from Lynch Station, Virginia; x ca.; pho tograph by Neal Ycdlin; color plates...C. A. Michael. COLD NUGGET FROM SPOTSYLVANIA COUNTY: Longest dimension approximately 13 cm., photograph...of Virginia R. V. DIETRICH* Professor of Geology and Associate Dean of Arts & Sciences, Virginia Polytechnic...Polytechnic Institute Research Division Bulletin 47 Virginia Polytechnic Institute, Blacksburg, Va. 24061 *... © R. V. Dietrich and the Research Division of Virginia Polytechnic Institute, 1970 Printed and bound |  | | Report (chapter) | | below the greenschist facies; the zeolite and prehnite-pumpellyite facies are distinguished where known...metamorphism was generally in the granulite or upper amphibolite facies. Rocks similar to those of the foreland...Laumontite PrehnitePumpellyite GS Epidote Amphibolite E Lower E < Middle Low Pressure Medium Pressure...Andalusite, Cordierite, Plagioclase (An > 10), Prehnite + Pumpellyite Plagioclase (Anl0-An30) Biotite...Saponite, Dolomite + Quartz 'White Mica' Ankerite Prehnite + Pumpellyite Greenschist Common Minerals Calc-Silicate |  | | Journal (article/letter/editorial) | | zeolite facies south of the Pyrite Belt through prehnite-pumpellyite facies to the greenschist facies in...original basaltic magmas (Pearce and Cann, 1973; Floyd and Winchester, 1975). Figure 2a and b show that...contemporaneous hercynian 'greenstones' in SW England (Floyd, 1976). In Fig. 3, all the upper, more alkalic lavas...and P2Os/Zr. Compare Pearce and Cann (1973) and Floyd and Winchester (1975) A J b .lO ~ ~ ~ J ~...occurrence of minerals such as pumpellyite and prehnite within the Y.3 Fig. 3. Ti-Zr-Y plot for the |  | | Book (volume) | | the western counties, especially the Clay Center Quarry 12 miles southeast of Toledo but in Ottawa Co....ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...townships of Washington, Virginia, Bedford, Jackson, Jefferson, Bethlehem, Monroe and Clark; on regional...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE |  | | Book (volume) | | the western counties, especially the Clay Center Quarry 12 miles southeast of Toledo but in Ottawa Co....ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...townships of Washington, Virginia, Bedford, Jackson, Jefferson, Bethlehem, Monroe and Clark; on regional...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE |  | | Journal (article/letter/editorial) | | the Pontide continental margin (Okay, 1984). Amphibolite facies metamorphic rocks within the Tavşanlı...sheared serpentinite in thrust contact with amphibolite. There is a transition from 483 484 A. P. Ö...the serpentinites close to the serpentinite– amphibolite contact, and identified as mafic segregations...during weathering or metamorphism (Winchester & Floyd, 1976). On this diagram (Fig. 3), the Kaynarca rocks...O versus Zr for the Kaynarca rocks, after 2 5& Floyd (1976). Winchester Sr K Rb Ba Th Nb Ce P Zr Ti |  | | Book (volume) | | beds, excavations, etc.Selenite roses. BRULE COUNTY AREA: in the Oacoma zone of the Pierre Fm. On Elm...gray Barite rosette up to 5 or 6 inches. CAMPBELL COUNTY MOUND CITY, W to the Missouri R., regional hillsides...gravels, etc.petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: area ridges, slopes, stream beds...Guide for Rock Hounds in the United States CUSTER COUNTY AREA: The November Mine, 1.2 mi. SE of the Needles...minesColumbite, Gold, Silver, etc.; and (2) Old Marble Quarry on the Needles Hwy. 5.5 mi. NEScheelite, and deep |  | France, Lydéric, Koepke, Juergen, Ildefonse, Benoit, Cichy, Sarah B., Deschamps, Fabien (2010) Hydrous partial melting in the sheeted dike complex at fast spreading ridges: experimental and natural observations. Contributions to Mineralogy and Petrology, 160 (5) 683-704 doi:10.1007/s00410-010-0502-6 | Journal (article/letter/editorial) | | typical granoblastic, hornfelsic lithologies in amphibolite- to granulite-facies and relate them to reheated...Dubois 1983; Lippard et al. 1986; Amri et al. 1996; Floyd et al. 1998; Selbekk et al. 1998; Beccaluva et al...Spray 1991; Spray and Dunning 1991; Twinning 1996; Floyd et al. 1998; Selbekk et al. 1998; Gillis and Coogan...composed of albitized plagioclase (An03), actinolite, prehnite, pumpellyite, titanite, and some magnetite (Fig...Plm ? Cpx) are localized in the prehnite reaction zones (see ‘‘Prehnite breakdown reaction’’ part for further |  | | Report (issue) | | ^ Anne Arundel County 43 Baltimore County 45 Howard County - Montgomery County 88 Prince Georges...Georges County Virginia 74 . 120 129 Arlington County 129 Fairfax County 131 Fauquier County 139...139 Loudoun County 143 Prince William County 149 Diabase quarries of northern Virginia 155 CAPTIONS...forming a ridge north of Route 7 near Dranesville, Virginia. Figure 7. Locations of mineral deposits in...mines in the Soldiers Delight region, Baltimore County, Maryland. Adapted from Pearre and Heyl , 19.60 |  | | Journal (issue) | | yth ANNUAL JEWELRY GEM &MINERAL SHOW Featuring Virginia Minerals, Mines and Localities BE A PROSPECTOR...14,1977 VIRGINIA BEACH CIVIC CENTER (THE DOME) 19TH AND PACIFIC AVENUE VIRGINIA BEACH, VIRGINIA Rocks&...Minerals from Virginia Richard S. Mitchell 230 Mineral and Fossil Collecting Sites in Virginia Palmer C....Pseudomorphs in Virginia R. V. Dietrich 244 The Geology of Virginia W. Cullen Sherwood 250 Prehnite—Apophyllite...Minerals of Virginia J. Alexander Speer Minerals from the Old Sulphur Mine, Louisa County, Virginia Richard |  | | Journal (article/letter/editorial) | | assemblages that decrease in grade from granulite–amphibolite facies immediately in contact with overlying...typical of mid-ocean ridge basalts (MORB; e.g. Floyd, Lees & Parker, 1976; Kirby, 1979). Previous studies...rocks (Fig. 1; Flett & Hill, 1912; Green, 1964c; Floyd, Exley & Styles, 1993): the mantle units (Lizard...amphibolites: Leake & Styles, 1984; Roberts et al. 1993; Floyd, Exley & Styles, 1993) and later, thrust emplacement-related...dolerite dykes of the Lizard Complex (Kirby, 1979; Floyd, 1984; C. A. Cook, unpub. Ph.D. thesis, Univ. Durham | | | Journal (article/letter/editorial) | | assemblages that decrease in grade from granulite–amphibolite facies immediately in contact with overlying...typical of mid-ocean ridge basalts (MORB; e.g. Floyd, Lees & Parker, 1976; Kirby, 1979). Previous studies...rocks (Fig. 1; Flett & Hill, 1912; Green, 1964c; Floyd, Exley & Styles, 1993): the mantle units (Lizard...amphibolites: Leake & Styles, 1984; Roberts et al. 1993; Floyd, Exley & Styles, 1993) and later, thrust emplacement-related...dolerite dykes of the Lizard Complex (Kirby, 1979; Floyd, 1984; C. A. Cook, unpub. Ph.D. thesis, Univ. Durham |  | | Journal (article/letter/editorial) | | exhumation), took place under epidote-amphibolite then amphibolite facies conditions. The last stage partly...recorded a transition from greenschist- to epidote-amphibolite facies overprinted by greenschist alteration...sphene) and epidote, with rare K-feldspar and prehnite. Metamorphic deformation and recrystallization...crystals parallel to the schistosity. In contrast, prehnite occurs in decussate aggregates that may engulf...beam current 10 nA (biotite, chlorite, feldspars, prehnite), 20 nA (amphibole, epidote, ilmenite, titanite) |  | | Book | | S. Igneous Rocks of South-West England P. A. Floyd, C. S. Exley and M. T. Styles 6. Quaternary of...Bridgland Igneous Rocks of South-West England P. A. Floyd Department of Geology, University of Keele. c....847761-SW 850766) Trevone Bay (SW 890762) Clicker Tor Quarry (SX 285614) Polyphant (SX 262822) Tintagel Head-Bossiney...Greystone Quarry (SX 364807) Pitts Cleave Quarry (SX 501761) Trusham Quarry (SX 846807) Ryecroft Quarry (SX...686814) C3 De Lank Quarries (SX 101755) C4 Luxulyan Quarry (Golden Point, Tregarden) (SW 054591 ) C5 Leusdon |  | | Report (issue) | | California 93740 USA Yildirim Dilek Department of Geology Miami University Oxford, Ohio 45056 USA Special Paper...Place, P.O. Box 9140 Boulder, Colorado 80301-9140, USA 2011 Copyright © 2011, The Geological Society...Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA. GSA provides this and other forums for the presentation...Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA www.geosociety.org Printed in U.S.A. GSA Books Science...California 93740, USA Yildirim Dilek Department of Geology, Miami University, Oxford, Ohio 45056, USA Mélanges |  | | Journal (article/letter/editorial) | | Ma), synchronous with the main greenschist-to-amphibolite retrograde metamorphism recorded in the metabasite...coronitic amphibole and late chlorite overgrowth. (G) Prehnite-calcite vein cutting across matrix amphibole....granulite facies assemblage and lack of pervasive amphibolite retrogression (sample NG353 and NG421); and (ii)...(ii) evidence of retrograde amphibolite replacement (samples SZ290, EG354D). In the following sections...Texturally-late veins also occur, dominantly consisting of prehnite and albite with minor chlorite and epidote (Fig |  | | Journal (article/letter/editorial) | | Zeolites and prehnite have been found in North Carolina in a wide variety of excava tions for power...sedimen tary rocks from south central Georgia to Virginia. In the North Carolina Piedmont, most zeolites...sites for zeolite crystallization. Zeolites and prehnite have been found in North Carolina in a wide variety...Nello Teer quarry, Durham Diabase sill (Triassic) X X Western Rowan Co., (Woodleaf quarry) Diortte...metasedimentary & metavolcanic rocks X X North quarry, west of Winston Salem, Forsyth Co. Foliated granite |  | | Journal (article/letter/editorial) | | Sciences, California State University, Fresno, CA, USA Published online: 03 Feb 2015. Click for updates...Sciences, California State University, Fresno, CA, USA Downloaded by [ECU Libraries] at 08:02 21 April...(csch) M SA 39° ci fi GO B. 39° Sonoma County Map Fig. 4 c E. GO GO Fz? 38° Ksb shown in...lawsonite–albite facies. Fb on Fig. 2 primarily prehnite–pumpellyite facies with some lawsonite–albite...or higher grade metamorphism; the remainder are prehnite–pumpellyite or zeolite grade (Blake et al. 1984 |  | | Journal (article/letter/editorial) | | Alabama P.O. Box 0 Tuscaloosa, Alabama 35486 85° • County Seat ALABAMA'S MINERAL INDUSTRY began in 1818...iron furnace was built near Russellville, Franklin County, utilizing local brown iron-ore (goethite) deposits...Tennessee River Valley area near Huntsville, Madison County, the first such mineralogical description in the...1831 along tributaries of the Coosa River (Chilton County). Utilization of mineral resources in Alabama has...iron ore, clay, marble, bauxite, and Figure 1. County map of Alabama. Courtesy U.S. Geological Survey |  | | Journal (article/letter/editorial) | | the numerous tungsten mines in the Darwin, Inyo County, California, area."—note from James H. Richardson...encountered in a railroad cut in dark-green amphibolite, one-half mile northeast of the Lockheed Reactor...on the south bank of the Etowah River, in Dawson County, Ga. Chatoyant masses of olive-gray tourmaline...parallel orientation. "Along zones where the amphibolite has been altered to blue-green chlorite there...felted needles on many of the amphibolite surfaces. Where the amphibolite has been chloritized, the hornblende |  | | Journal (article/letter/editorial) | | AJ-20, University of Washington, Seattle, WA 98195, USA z Institut ffir Kristallographie und Petrographie...Geology, University of Oregon, Eugene, OR 97403, USA Abstract. Analyses for major, minor, and trace element...facies ( T > 800 ~ C, P > 2 0 kbar) followed by amphibolite facies, sillimanite zone. Protoliths were tholeiitic...progressive metamorphism to the highest zone of the amphibolite facies (sillimanite + K-feldspar in pelites,...CaO-rich domains rich in epidote, pumpellyite, prehnite, etc. (Smith 1968), c a n n o t be excluded, the |  | Dumańska-Słowik, Magdalena, Powolny, Tomasz, Khac, Giang Nguyen, Heflik, Wiesław, Sikorska-Jaworowska, Magdalena (2020) Petrogenesis of scapolite-rich gabbro from the alkaline Cho Don complex in north-eastern Vietnam - mineralogical and geochemical implications. Lithos, 374. 105703pp. doi:10.1016/j.lithos.2020.105703 | Journal (article/letter/editorial) | | medium- to high-pressure/depth assemblages of amphibolite and granulite facies (Appleyard and Williams...contain veinlets filled with yellow-luminescent prehnite. Most of these developed at the contact between...scapolite into secondary phases (i.e., micas and prehnite). (H) Interstitial K-feldpsar accompanied by calcite...ver-Cal – vermicular calcite; Mca – mica; Prh – prehnite. Rogojine, 2002). Additionally, some crystals...the range of 200–900 nm. (G) Yellow-luminescent prehnite-rich vein penetrating through host brown-luminescent |  | | Journal (article/letter/editorial) | | calcic amphibole, albite, quartz, biotite, zoisite, prehnite and ore minerals (sulphides + ilmenite). The amphibolites...hydrous minerals (calcic amphibole, chlorite and prehnite) and accessory minerals (titanite and calcite)...which are composed of grossularite, hydrogarnet, prehnite, wollastonite, zoisite, epidote and diopside (Dubinska...Wiley & Sons, Ltd. Figure 5. The contact of amphibolite with host rocks of the Vorontsovka series (drawing...spotted structure of diopsidite; (d) relics of amphibolite in diopsidite. Copyright © 2016 John Wiley & |  | Hara, Hidetoshi, Ito, Tsuyoshi, Tokiwa, Tetsuya, Kong, Sitha, Lim, Pagna (2020) The origin of the Pailin Crystalline Complex in western Cambodia, and back-arc basin development in the Paleo-Tethys Ocean. Gondwana Research, 82. 299-316 doi:10.1016/j.gr.2020.01.007 | Journal (article/letter/editorial) | | crust and the Sukhothai Arc. re -p Keywords: amphibolite; back-arc basin; geochemistry; Paleo-Tethys;...Cretaceous upper amphibolite facies metamorphism; and (3) Eocene lower amphibolite facies metamorphism...Block (Figs. 1, 2). The complex is composed of amphibolite, basic gneiss, gabbro, and sheared diorite and...and granodiorite. The rocks record amphibolite facies metamorphism and were regarded as Precambrian protoliths...immobile in mafic rocks under greenschist to amphibolite facies conditions and provide a record of the |  | | Report (issue) | | COVER PHOTO : Gold nugget from Dukes Creek, White County, weight 5 oz., 12 dwt., approx. 2x. BACK COVER...approx. 1.5x. Lower left - Goethite from Pulaski County, approx. lx. Right - Magnetite crystal face showing........................................... -153 Prehnite .......................................................................................... 170 County Index ...........................................from Washington and Bleck ley counties to Irwin county. Some minerals described herein have never been |
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