 | | Report (issue) | | Mica Deposits of the Blue Ridge in North Carolina GEOLOGICAL SURVEY PROFESSIONAL PAPER 577 Work done...done in part in cooperation with the North Carolina Department of Conservation and Development and in part...Administration Mica Deposits of the Blue Ridge in North Carolina By FRANK G. LESURE GEOLOGICAL SURVEY PROFESSIONAL... Work done in part in cooperation with the North Carolina Department of Conservation and Development... Geologic map of part of the Blue Ridge of North Carolina and Tennessee. 2-6. Maps showing location of |  | CORNELL, D, HUMPHREYS, H, THEART, H, SCHEEPERS, D (1992) A collision-related pressure-temperature-time path for Prieska copper mine, namaqua-natal tectonic province, South Africa. Precambrian Research, 59 (1) 43-71 doi:10.1016/0301-9268(92)90051-o | Journal (article/letter/editorial) | | pressure-temperature-time path for Prieska Copper Mine, Namaqua-Natal tectonic Province, South Africa D...pressure-temperature-time path for Prieska Copper Mine, Namaqua-Natal tectonic Province, South Africa.... Precambrian Res., 59:43-71. Prieska Copper Mine lies in highly metamorphosed gneisses of the 1100 Ma...geochronology to develop a model PTt path for the Prieska Mine region. The model envisages an orogenic cycle at...and 0.05 mm/yr uplift rate envisaged for Prieska Mine are long and slow compared with Phanerozoic examples |  | | Journal (article/letter/editorial) | | Leverburgh supracrustal belt (Fig.2) 1 Pelitic perthite garnet kyanite microcline biotite, sillimanite...clinopyroxene--garnet--plagioclase (in basic granulites) perthite--quartz (in acid granulites) (estimate based on...emplacement from Tarney, 1973) few metadolerites north of Loch Laxford (J.W.). Garnet--clinopyroxene-plagioclase...Lambert, 1974; Sutton and Watson, 1969; Beach, 1974; Coward et al., 1970) and these movements may account for...and the X-axes had steep pitches (cf., Graham and Coward, 1973; Davies et al., 1975). The early Laxfordian |  | | Journal (article/letter/editorial) | | Cordierite-sillimaniteandesine/oligoclase-micagarnet-microcline-perthite (in metapelites) hypersthene-hornblendelabrad... 1977) and the E-W striking Zambezi belt (e.g. Coward, 1980). The Mwembeshi shear zone separates the...Zambezi belt from the Pan-African mobile belts to the north (Fig. 1 ). The Okahandja and Schlesien lineaments...greenschist-facies conditions prevailed in the north of the studied area, whereas south of Mzimba amphibolitefacies...(1977). Mozambique belt and the Mwembeshi zone north to it. The end of the Pan-African orogeny in Malawi |  | | Journal (article/letter/editorial) | | The pluton has a concordant planar fabric of perthite megacrysts, and could have grown by mature diapirism...HLS has a conspicuous planar fabric of euhedral perthite megacrysts (Fig. 3) 193 Fig. 3. Megacryst fabric...contact. Note mafic mineral inclusions within perthite megacrysts. The largest megacryst was broken in...in the dyke. 195 Fig. 4b. Aplitic dyke cuts perthite fabric near southeastern boundary of the pluton...the dykes contain large xenocrysts of euhedral perthite that have random orientation. The same granite |  | | Journal (article/letter/editorial) | | samples were collected in the Mtuga and Munshiwemba mine areas. Daly et al., 1984). T he Complex has been...4 cm in length) of microcline and microcline--perthite. Granite bodies and basic dykes, now present as...503,507,508, 509 Mtuga mine ZAM511,512,513, 515,516,517,518, 519,520 Mtuga mine White (grey) granite...facies' of the Mtuga Granite, collected in the Mtuga mine area in the northern margin of the granitic intrusion...facies' of the Mtuga Granite, collected in the Mtuga mine area in the central part of the granitic intrusion |  | | Journal (article/letter/editorial) | | the Inner Dinarides and Hellenides (Nicolas and Jackson, 1972; Bebien et al., 1980; Karamata et al., 1980)...plagioclase. K-feldspar (Or93_90Ab7_lo) is microcline perthite; it is mostly kaolinised. Plagioclase is of albitic...northern part of the Fanos granite and north of the old molybdenum mine. They are fine- to medium-grained...granite plutonism in the Mid-Proterozoic of Wisconsin, USA. Contrib Mineral Petrol 74:311-328 Andronopoulos...characteristics of collision-zone magmatism. In: Coward MP, Ries AC (eds) Collision tectonics. Geol Soc |  | | Book | | position of the Outer Hebrides Thrust in southern North Uist. (D 3197) , Geology of the Outer Hebrides...Island form a 210 km long archi pelago on the north western seaboard of Scotland. The islands take the...and once formed part of an extensive Precambrian North Atlantic craton, along with similar rocks in Greenland...is correlated with the Scourie dykes of mainland north-west Scotland. In southern South Harris a suite...Geology (North Sheet) Quaternary Geology (North Sheet) Hydrogeology (Scotland) Aeromagnetic (North Sheet) |  | | Report (issue) | | under a cooperative agreement with the State of North Carolina and the Tennessee Valley Authority Physical...under a cooperative agreement with the State of North Carolina and the Tennessee Falley Authority UNITED...Production of sheet and punch mica, 1912-14, in North Carolina, the Southeastern States, and the entire United...data for mica specimens, arranged by lot and by mine or prospect-_-___--_-___-_-.___---___-_____--_ Results..._______________ 13. Test data for mica (not identified by mine), taken from the production line of the Colonial |  | Bergh, S.G., Corfu, F., Priyatkina, Nadezhda, Kullerud, K., Myhre, P.I. (2015) Multiple post-Svecofennian 1750–1560 Ma pegmatite dykes in Archaean-Palaeoproterozoic rocks of the West Troms Basement Complex, North Norway: Geological significance and regional implications. Precambrian Research, 266. 425-439 doi:10.1016/j.precamres.2015.05.035 | Journal (article/letter/editorial) | | zoic rocks of the West Troms Basement Complex, North Norway: Geological significance and regional implications...b s t r a c t The West Troms Basement Complex, North Norway, consist of Meosarchaean, Neoarchaean and...Bergh et al., 2010; Myhre et al., 2011). In the north, on Ringvassøya and adjacent islands, 2.92–2.83...Vanna Group (Bergh et al., 2007). In these domains north of the Kvalsund shear zone, the Palaeoproterozoic...supracrustal belt. View is on horizontal surface toward north. Gray shaded units in Fig. 5a and c are supracrustal |  | | Report (chapter) | | coarse-grained granite (perthite, hedenbergite, amphibole, biotite, +_fayalite) to peralkaline (perthite, aegirine-augite...fine-grained granite (perthite, biotite, chlorite, _+amphibole); K5', medium-grained granite (perthite, amphibole...granite (perthite, oligoclase, amphibole, biotite); K7, fine- to coarse-grained granite (perthite, oligoclase...fine-grained granite (perthite, oligoclase, biotite, chlorite); K9, granite porphyry (perthite, oligoclase, biotite...astrophyllite); K 11, coarse-grained granite (perthite, amphibole, biotite); K 12, finegrained granite |  | | Journal (article/letter/editorial) | | were controlled by the development of a north-westerly and a north-easterly lineament which are followed...The structure of the Lewisian gneiss complex in north-west Scotland is related to a composite tectonic...character tapering northward a nd flanked to north-west and north-east by outward-dipping tracts of strongly...foliat ed 6 l.axfordian pegmatite: micr ocline-perthite, quartz (plag ioclase, biotite etc.) Most of...quartzofeldspathic matrix. In certain tracts, notably along the north-west coast, they contain abundant stringers and |  | Basta, Fawzy F., Maurice, Ayman E., Bakhit, Bottros R., Azer, Mokhles K., El-Sobky, Atef F. (2017) Intrusive rocks of the Wadi Hamad Area, North Eastern Desert, Egypt: Change of magma composition with maturity of Neoproterozoic continental island arc and the role of collisional plutonism in the differentiation of arc crust. Lithos, 288. 248-263 doi:10.1016/j.lithos.2017.07.011 | Journal (article/letter/editorial) | | Intrusive Rocks of the Wadi Hamad Area, North Eastern Desert, Egypt: Change of Magma Composition... Atef, Intrusive Rocks of the Wadi Hamad Area, North Eastern Desert, Egypt: Change of Magma Composition...MANUSCRIPT Intrusive Rocks of the Wadi Hamad Area, North Eastern Desert, Egypt: Change of Magma Composition...post-collisional calc-alkaline granitoids in the north ANS have a geodynamic interest as they MA represent...late Neoproterozoic intrusive rocks exposed in the north Eastern Desert of Egypt, in the Wadi Hamad area |  | | Journal (article/letter/editorial) | | 1180/0026461046840207 # 2004 The Mineralogical Society north of Assynt, to the Achall valley near Ullapool, but...(Johnson and Parsons, 1979; Elliott and Johnson, 1980; Coward, 1983, 1985). West of the Assynt Culmination lies...the Sole Thrust has been a cause of some debate (Coward, 1985; Halliday et al., 1987) and this has not...patterns from Peach et al. (1907), modified after Coward (1983) and Krabbendam and Leslie (2004). MT Moine...pre-date thrusting can be seen at the roadside on the north shore of Loch Assynt (NC 240239), where an offshoot |  | Tao, Yan, Bi, Xianwu, Li, Chusi, Hu, Ruizhong, Li, Yubang, Liao, Mingyang (2014) Geochronology, petrogenesis and tectonic significance of the Jitang granitic pluton in eastern Tibet, SW China. Lithos, 184. 314-323 doi:10.1016/j.lithos.2013.10.031 | Journal (article/letter/editorial) | | Sciences, Indiana University, Bloomington, IN 47405, USA University of Chinese Academy of Sciences, Beijing...which is situated in the southern margin of the North Qiangtang block in eastern Tibet, may provide critical...information about the source and derivation of the North Qiangtang block during Gondwana breakup and dispersion...Longmu Co–Shuanghu collisional suture between the North and South Qiangtang blocks. The Jitang granitoids...meta-sedimentary rocks from the Indian craton as well as the North Qiangtang block. The results from this study indicate |  | | Report (volume) | | of the Aubrey Peak Wilderness Study Area, Mohave County, Arizona By JAMES G. EVANS, RANDALL H. HILL, WILLIAM...of the Aubrey Peak Wilderness Study Area, Mohave County, Arizona I james G. Evans . . . [et al.] p. em...areas-westcentral Arizona and part of San Bernardino County, California; ch. D)(U.S. Geological Survey bulletin...Peak Wilderness Study Area (AZ-020-{)54), Mohave County, Arizona. CONTENTS Summary Dl Abstract Dl Character...of Aubrey Peak Wilderness Study Area, Mohave D2 County, Arizona 2. Map showing mineral resource potential |  | Bloem, Erik J.M., Dalstra, Hilko J., Ridley, John R., Groves, David I. (1997) Granitoid diapirism during protracted tectonism in an Archaean granitoid-greenstone belt, Yilgarn Block, Western Australia. Precambrian Research, 85 (3) 147-171 doi:10.1016/s0301-9268(97)00034-x | Journal (article/letter/editorial) | | subdivided into six major tectonic provinces: the North-Western Gneiss Terrain; the South-Western Gneiss...subdivided into the South-Western Gneiss Terrain, the North-Western Gneiss Terrain, the Murchison Province,...trend of roughly increasing metamorphic grade from north to south. Abbreviations: G.B.=greenstone belt. R...1: Deformed granitoid I:--I Greenstone belt x Mine ‘j, o Mineral lineation+plunge \ Trend main Foliatiorwdip...which, in places, contain olivine and pyroxene. North of Southern Cross, serpentine is present and the |  | | Journal (article/letter/editorial) | | on the basis of fabric and lithology (Fig. 1). North and South Marginal zones consist of remnants of...location of Beitbridge within the Limpopo Belt. A = North Marginal Zone, B = Central Limpopo Belt, C = South...granulites from the North Marginal Zone (Hickman, 1978). Petrofabric analysis from the North Marginal Zone...complex than this since Sm-Nd mineral ages from the North Marginal Zone indicate that some granulite facies...-SillimaniteQuartz-Biotite:t Perthite (ii) Cordierite-Garnet-Sillimanite-Quartz-BiotitePlagioclase:t Perthite (iii) Cor |  | Seddik, Amany M.A., Darwish, Mahmoud H., Azer, Mokhles K., Asimow, Paul D. (2020) Assessment of magmatic versus post-magmatic processes in the Mueilha rare-metal granite, Eastern Desert of Egypt, Arabian-Nubian Shield. Lithos, 366. 105542pp. doi:10.1016/j.lithos.2020.105542 | Journal (article/letter/editorial) | | Pasadena CA 91125 Jo ur na lP re -p ro of USA 1 Corresponding Author: Prof. Mokhles K. Azer (mokhles72@yahoo...crystals of orthoclase and perthite with fewer crystals of microcline. The perthite crystals show various...plagioclase inclusions are observed within the perthite crystals (Fig. 4a). Quartz occurs as rounded to...oxides and Nb-Ta oxides are accessory K-feldspars (perthite, orthoclase and microcline) occur as subhedral...the margins of K-feldspar crystals (Fig. 4f). Perthite is the dominant Kfeldspar and shows a variety |  | | Journal (article/letter/editorial) | | frequently show oblate finite-strain geometries (e.g., Coward 1976; Choukrone and Gapais 1983; O’Hara 1990; Bailey... 4 9 2 2 2 1 2 3 1 2 1 1 ! Accessories are perthite (ca. An , Or ; see Fig. 3b), sericite, zircon...propagation effects lead to flattening strains (e.g., Coward 1976). Glazner and Bartley (1991) report pronounced... Shikoku, SW Japan. J Struct Geol 12 : 431—441 Coward MP (1976) Strain within ductile shear zones. Tectonophysics...fluid-rock interactions, Linville Falls fault, North Carolina. J Struct Geol 15 : 849—863 Nicolas A, Poirier |  | | Journal (article/letter/editorial) | | collision and terrane accretion ending at ~2.7 Ga (Coward and Fairhead 1980; Light 1982; McCourt and Vearncombe...(described below in section 4.1.2) were obtained at the North M East National Ion Microprobe Facility using...and was collected from an outcrop located ~500 m north of the Elands River AN along the R33 road. Both...coarse-grained muscovite, amphibole, diopside, perthite, AN and ilmenite with minor amounts of rutile...2015). CE The zircon in the sample occurs within perthite and diopside that are in AC textural equilibrium |  | | Journal (article/letter/editorial) | | observations of Odell ( 1975 ) and geophysical data of Coward (1983) and Stuart and Zengeni ( 1987 ) support...towns. zones, the Tuli-Sabi Shear Zone in the north and the Palala Shear Zone in the south (Mason, 1973)...indicate a systematic change in composition from north to south or from east to west in the studied area... does not show a systematic change either from north to south or east to west in the studied area, probably...observed in the studied area include K-feldspar, perthite, and plagioclase. Kfeldspar is almost constant |  | Wu, Kaiyang, Zhong, Yun, Yuan, Yajuan, Wan, Zhifeng, Xia, Bin, Wu, Tengfei (2022) Early Cretaceous Granitoids Magmatism in the Nagqu Area, Northern Tibet: Constraints on the Timing of the Lhasa–Qiangtang Collision. Minerals, 12 (8) 933 doi:10.3390/min12080933 | Journal (article/letter/editorial) | | ) Oklahoma Geological Survey, Norman, OK 73019, USA; victorwu@ou.edu Correspondence: yuanyajuan@m.scnu...from north to south, and theseQaidam Songpan–Ganzi, Qiangtang, Lhasa and Himalaya blocks from north to...Bangong–Nujiang and Yarlung Zangbo suture zones from north to south, respectively (Figure 1a) [31]. The Qiangtang...Bangong–Nujiang and Yarlung Zangbo suture zones from north to south, respectively (Figure 1a) [31]. The Qiangtang...accretionary complex) by thrust faults on both the north and south sides (Figure 1d) [33]. There are reported |  | | Journal (article/letter/editorial) | | Botswana have been summarized by previous workers (Coward and James, 1974; Litherland, 1975; Key, 1976; Key...rock is monzogranitic and consists of microcline, perthite, plagioclase, quartz, biotite and sporadic calcic...craton has been a matter of debate for many years (Coward et al., 1976; Nisbet et al., 1981; Wilson, 1990;...Proterozoic mineralisation and tectonics at Renco mine (Northern Marginal Zone, Limpopo belt, Zimbabwe)...belt, Rhodesia. Precambrian Res. 3, 253 /271. Coward, M.P., James, P.R., 1974. The deformation patterns |  | Belyanin, G. A., Rajesh, H. M., Sajeev, K., Van Reenen, D. D. (2012) Ultrahigh-temperature metamorphism from an unusual corundum+orthopyroxene intergrowth bearing Al–Mg granulite from the Southern Marginal Zone, Limpopo Complex, South Africa. Contributions to Mineralogy and Petrology, 164 (3) 457-475 doi:10.1007/s00410-012-0747-3 | Journal (article/letter/editorial) | | Craton to the south and the Zimbabwe Craton to the north (Fig. 1a). It is subdivided into three zones, the...steep inward-dipping shear zones at *2.68 Ga, the North Limpopo Thrust Zone and the Hout River Shear Zone...from each other by thin rims of quartz, small perthite grains, or myrmeckites, are characterized by uniformly...antiperthites (A) separated from each by quartz, perthite (P), or myrmeckite (m) 123 Contrib Mineral...Zimbabwe, and relevance to gold mineralization at Renco Mine. S Afr J Geol 107:377–396 Bohlen SR (1987) Pres |
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