 | Horton, J. Wright, Peper, J.D., Marr, J.D., Burton, W.C., Sacks, P.E. (1993) Preliminary geologic map of the South Boston 30 x 60 minute Quadrangle, Virginia and North Carolina. Open-File Report Vol. 1993 (93-244) US Geological Survey doi:10.3133/ofr93244 | Report (issue) | | of the South Boston 30 X 60 Minute Quadrangle, Virginia and North Carolina by J. Wright Horton, Jr.1...Report 93-244 Prepared in cooperation with the Virginia Division of Mineral Resources This report is preliminary... 1 U.S. Geological Survey, Reston, VA 22092 2 Virginia Division of Mineral Resources, P.O. Box 3667,...quadrangle (Figure 1) is located in south-central Virginia and northernmost North Carolina. It covers an...Brunswick, Charlotte, Halifax, Lunenburg, and Mecklenburg Counties, Virginia, and parts of Granville, Person |  | | 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 (volume) | | ................................ 49 Individual quarry areas.................................................. 51 Baltimore County .................................... 51 Howard County.......................CHAPTER III. GRANITES OF VIRGINIA ...................................... The Virginia Piedmont region ......the Falls Church area.. Yellow-green and pink epidote granite Unakite............... 69 70 70 70 71...77 77 CONTENTS. 5 CHAPTER III. GRANITES OP VIRGINIA Continued. PageScientific discussion Continued |  | | Journal (volume) | | average values for the NiO content of amphibole in epidote amphibolite facies is 878 p.p.m., in amphibolite...of the sulphide phase. In t r u s ion No 10. An epidote-tremolite rock with a sulphide dissemination. It...conclusive proof is, however, lacking. In addition to epidote and tremolite, the rock contains sphene, quartz...the former predominating. Sometimes labradorite, epidote and sericite occur in varying quantities. 24...is the predominant mafic mineral. Labradorite, epidote and chlorite are also present. In some specimens |  | | Report (issue) | | joint fractures at the Molly Hughes, Comstock - Virginia and Republic properties (C. E . Cairnes, 1934:...llage ofActinolite in Elzevir Township, Hastings County . 31 F /1 5 Chemi cal analysis of a light greenish...actino l ite from Westmeath Township , Renfrew County: Si0 2 56 . 70 , Al 0 3 1. 62 , Fe o 3 . 06 , FeO...Township of St . Francis (Beauceville ) , Beauce County : Si0 52 . 30 , Al 2 o 1 . 30 , FeO 6 . 75, 2 3...syenites near Montreal in H oche laga County, and Beloeil in Rouville County (G. C . Hoffmann, 1 888 - 9 : Geol |  | | Report (volume) | | ............................................. Virginia......................................................................................... West Virginia.................................................See Bauxite and Halloysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found...commercial quantity or quality. Asphalt. Colbert County, small quantity has been shipped from near Leighton;...following localities : Bibb County, Pratts Ferry; Calhoun County, near Tampa; Clay County, T. 20 S., R. 7 E.; |  | | Report (volume) | | .........Prof. George H. Perkins, Burlington. Virginia...........Dr. Thomas L. Watson, Charlottesville...Washington....... Prof. Henry Landes, Seattle. West Virginia... .Dr. I. C. White, Morgantown. Wisconsin......See Bauxite and Hallpysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found...commercial quantity or quality. Asphalt. Colbert County, small quantity has been shipped from near Leighton;...following localities: Bibb County, Pratts Ferry; Calhoun County, near Tampa; Clay County, T. 20, Pv. 7 E.; Jefferson |  | Hodges, C.A., Cox, D.P., Singer, D.A., Case, J.E., Berger, B.R., Albers, J.P. (1984) U.S. Geological Survey-INGEOMINAS mineral resource assessment of Colombia. Open-File Report Vol. 1984 (84-345) US Geological Survey doi:10.3133/ofr84345 | Report (issue) | | consists mainly of illite, adularia, chlorite, epidote, and calcite. Deposits occur most commonly within...around these deposits characterized by chlorite-epidote-pyrite and Fe-rich carbonates. Using wet chemical...geologic map of the Silver City Mining region, Grant County, New Mexico: U.S. Geological Survey Geophysical...Alteration Diopside-hedenbergite+grossular-andradite+epidote. amphibole±chlorite±ilvaite. Late stage Ore Controls...tmorillonite. Igneous rocks may be altered to epidote pyroxene garnet or to potassic and phyllic assemblages |  | | Report (volume) | | California--Bldg. 3, Rm. 3128,345 Middlefield Rd. • RESTON, Virginia--National Center, Rm. 1C402, 12201 Sunrise Valley...USAK USPA CNBC NRWY 28 Model 7a--Con. ~') Kenbridge Kylmakoski Lainijaur Lappuattnet Laukunkawges...white. Biotite is absent. Veinlets of actinolite, epidote, and hematite have hard, white alteration haloes...alteration plagioclase------- albite or oligoclase + epidote or calcite Rocks are hard and dull greenish gray...gray. Veinlets of pyrite or chlorite and epidote lack prominent alteration haloes. hornblende and biotite------- |  | | Book | | former Editorial Assistants Betty Weinman and Virginia Lee Fisk got back into harness and together with...outward to the propyllitic assemblage—chlorite-epidote-carbonatepyrite. This outer envelope or zone may...suggestions which im¬ proved the quality of this review. Virginia B. Meyer assisted in editorial matters and prepared...and ore de¬ posits of the Jerome area, Yavapai County, Arizona: U.S. Geol. Survey Prof. Paper 308, 185...and Henderson molybdenite de¬ posits, Clear Creek County, Colorado, with a section on a com¬ parison of |  | | Book | | Comprehensive Example: The Cree de District, Colorado, USA 4.11. Summary 4.12. Recommended Reading .!CHAPTER...culminating with the Creede vein type deposit (Colorado, USA) as a comprehensive example. The second part of the...Intrusions related to flood basalts Duluth Complex, USA Nori!' sk-Tanakh, Siberia Ni-sulfide Ni-Cu sulfide...Bushveld Complex, South Africa Stillwater Complex, USA Great Dyke, Zimbabwe Sudbury Complex, Canada Chromite...Cu-sulfide Asbestos Union Bay, Alaska, USA Duke Island, Alaska, USA ' ,hosted in the ultramafic zone of |  | | Report (issue) | | a c t u r e s a t t h e Molly Hughes, Comstock-Virginia and R e p u b l i c p r o p e r t i e s (C.E....i n o l i t e from Westmeath Township, Renfrew County: SiO, 56.70, Al,O, 1.62, Fe,O, 3.06, Fe0 7.19,...9-10, ranges 11-111, Shipton Township, Richmond County, a t 45046'25ftN, 71 057'12'fW. E l e c t r o n...r a n c i s ( B e a u c e v i l l e ) , Beauce County: Si0, 52.30, A1,0, 1.30, Fe0 6.75, N i O t r a...a r Montreal i n Hochelaga County, and B e l o e i l i n Rouville County (G.C. Hoffmann, 1888-9: Geol |  | | Report (Issue volume) | | chlorite or actinolite, plagioclase, and commonly epidote. In the gneiss zones metamorphism reaches amphibolite...structures. Quartz, plagioclase, biotite, hornblende, epidote, and usually microcline are characteristic minerals... are amygdaloidal. Calcite, quartz, chlorite, epidote, and locally native copper or chalcocite occur...variable amounts of quartz, garnet, biotite and epidote and quartz-plagioclase-biotite gneiss with variable...lesser amounts of quartz, biotite, garnet, and epidote. Relict pillows occur in some bands but other hornblende |
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