Academic literature on the topic 'Ysgol Dolgellau (Dolgellau, Wales)'

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Journal articles on the topic "Ysgol Dolgellau (Dolgellau, Wales)"

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John-Joe, Traynor. "Arenig sedimentation and basin tectonics in the Harlech Dome area (Dolgellau Basin), North Wales." Geological Magazine 127, no. 1 (January 1990): 13–30. http://dx.doi.org/10.1017/s0016756800014138.

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AbstractArenig (Ordovician) clastic sediments crop out in the Harlech Dome region (North Wales), and are placed in a single stratigraphic unit: the Allt Lwyd Formation. This unit records a marine transgression onto an erosion surface produced during late Tremadoc arc volcanicity. Four discrete petrofacies are denned, and reflect differing proportions of detritus derived from Tremadoc-type basic-intermediate igneous rocks, and the local sedimentary basement. Initial shallow marine siliciclastic sandstones and conglomerates are overlain by extensive deep water mud-rich units. These generally shallow up into a complex arc-apron deposit, with sediments derived from the eroding Tremadoc arc, as well as from similar, synchronous volcanics. Predominantly epiclastic sandstones and conglomerates were deposited in deltaic and tidal environments in an arc-apron complex, and capped by condensed mudstones and an ironstone, deposited as sea level rose across these systems. Sediments were ponded in north–south orientated troughs and derived from uplifted blocks. Facies and petrofacies distribution were controlled by syn-sedimentary north-south and northeast–southwest faults. The Allt Lwyd Formation was ponded in a fault-controlled basin (the Dolgellau Basin), one of a series of interconnected sub-basins flooded by the Arenig transgression. The sediments preserved reflect deposition during the transgression of a volcanic arc, prior to the extrusion of marginal basin-type volcanics.
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Dominy, S. C., and I. M. Platten. "Gold mineralisation and ore controls at the Clogau mine, Dolgellau, north Wales, United Kingdom." Applied Earth Science 121, no. 1 (March 2012): 12–28. http://dx.doi.org/10.1179/1743275812y.0000000012.

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Mason, J. S., R. E. Bevins, and D. H. M. Alderton. "Ore mineralogy of the mesothermal gold lodes of the Dolgellau gold belt, North Wales." Applied Earth Science 111, no. 3 (December 2002): 203–14. http://dx.doi.org/10.1179/037174502765188600.

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Platten, I. M., and S. C. Dominy. "Re-evaluation of quartz vein history in the Dolgellau Gold-Belt, North Wales, United Kingdom." Geological Journal 34, no. 4 (November 1999): 369–91. http://dx.doi.org/10.1002/(sici)1099-1034(199911/12)34:4<369::aid-gj832>3.0.co;2-g.

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Cope, J. C. W., and A. W. A. Rushton. "Cambrian and early Tremadoc rocks of the Llangynog Inlier, Dyfed, South Wales." Geological Magazine 129, no. 5 (September 1992): 543–52. http://dx.doi.org/10.1017/s0016756800021701.

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AbstractUntil recently no Cambrian rocks were known in the Llangynog area. Detailed mapping has now revealed a succession of ?Lower and Upper Cambrian rocks overlain by Tremadoc rocks. The Allt y Shed Sandstones (new) rest unconformably on the Precambrian, but have yielded no diagnostic fossils and are tentatively assigned to the Comley Series. Succeeding with faulted or unconformable contact is an Upper Cambrian Merioneth Series succession which includes in ascending order: conglomerates, sandstones and siltstones with olenid trilobites and resembling the Treffgarne Bridge Beds of the Haverfordwest area; micaceous shales and siltstones referred to the Ffestiniog Flags Formation; and black mudstones with calcareous concretions and a rich olenid fauna referred to the Dolgellau Formation. Succeeding the latter with possible disconformity is a succession belonging to the lower part of the Tremadoc Series and earlier than any rocks of that series hitherto recorded from the area.
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BOTTRELL, S. H., T. J. SHEPHERD, B. W. D. YARDLEY, and J. DUBESSY. "A fluid inclusion model for the genesis of the ores of the Dolgellau Gold Belt, North Wales." Journal of the Geological Society 145, no. 1 (January 1988): 139–45. http://dx.doi.org/10.1144/gsjgs.145.1.0139.

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BOTTRELL, S. H., and B. SPIRO. "A stable isotope study of black shale-hosted gold mineralization in the Dolgellau Gold Belt, North Wales." Journal of the Geological Society 145, no. 6 (November 1988): 941–49. http://dx.doi.org/10.1144/gsjgs.145.6.0941.

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Shepherd, T. J., S. H. Bottrell, and M. F. Miller. "Fluid inclusion volatiles as an exploration guide to black shale-hosted gold deposits, Dolgellau gold belt, North Wales, UK." Journal of Geochemical Exploration 42, no. 1 (December 1991): 5–24. http://dx.doi.org/10.1016/0375-6742(91)90058-3.

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Price, Cynthia G., and Peter W. Abrahams. "Copper tolerance in a population of Silene vulgaris ssp. maritima (A. & D. Love) at Dolfrwynog Bog near Dolgellau, North Wales." Environmental Geochemistry and Health 16, no. 1 (March 1994): 27–30. http://dx.doi.org/10.1007/bf00149590.

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Dissertations / Theses on the topic "Ysgol Dolgellau (Dolgellau, Wales)"

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Bottrell, S. H. "The origin of the gold mineralization of the Dolgellau district, North Wales : The chemistry and role of fluids." Thesis, University of East Anglia, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372217.

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The mineralized veins of the Dolgellau Gold Belt, their host shales (the Clogau Shales and Maentwrog Formation) and the underlying Cambrian/Pre-Cambrian' sequence of the Harlech Dome with its associated igneous rocks have all been studied by a combination of geochemical, fluid inclusion and stable isotope techniques. This has enabled the characterization of the fluids associated with the metamorphic and mineralizing events in the Dome and estimation of the pressure-temperature conditions of these events. Fluid inclusion studies. show the metamorphic fluid in the "Lower Formations" (those below the Clogau Shale) to be an aqueous Na-K-Cl brine while in the Clogau Shales it is an immiscible pair of CH4-H2O fluids with Na-K-Cl dissolved in the aqueous-rich phase. This implies that conditions were far more reducing in the Clogau Shales during metamorphism due to the presence of graphite in the shale. Geothermometry and geobarometry using the immiscible fluid pair in the Clogau Shales gives metamorphic conditions of 300-3650C, 3.0-3.3 Kb. The mineral ized-vein inclusions also contain an immiscible CH4-H20 pair which yeild conditions for the mineralizing event of 245- 3200C, 1.6 Kb at the maximum temperature. Both metamorphic and mineralized vein samples show late-stage calcic and weakly saline aqueous inclusions. Oxygen isotopes show widespread resetting of carbonate and mica minerals, probably an effect of the late stage fluids noted above, while quartz retains a metamorphic value. Isotopic temperature estimates for metamorphic and mineralizing conditions are consistent with those from fluid inclusionson the basis of the fluid inclusion evidence a model has been proposed for the genesis of the ores of the Gold Belt. This model postulates that an oxidized metamorphic fluid from the Lower Formations was introduced into the Clogau Shale. Here it underwent reaction with its new host and became more reduced as some of the introduced water reacted with graphite in the shale to produce methane with consequent deposition of the ores. The stable isotope data and theoretical consideration of the fluid inclusion and geochemical data all support this model. They also suggest that a basic/ultrabasic igneous lithology was the source of the gold-mineralizing fluid
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Naden, Jonathan. "Gold mineralisation in the Caledonides of the British Isles with special reference to the Dolgellau gold belt, North Wales and the Southern Uplands, Scotland." Thesis, Aston University, 1988. http://publications.aston.ac.uk/14384/.

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Two aspects of gold mineralisation in the Caledonides of the British Isles have been investigated: gold-telluride mineralisation at Clogau Mine, North Wales; and placer gold mineralisation in the Southern Uplands, Scotland. The primary ore assemblage at Clogau Mine is pyrite, arsenopyrite, cobaltite, pyrrhotine, chalcopyrite, galena, tellurbismuth, tetradymite, altaite, hessite, native gold, wehrlite, hedleyite, native bismuth, bismuthunite and various sulphosalts. The generalised paragenesis is early Fe, Co, Cu, As and S species, and later minerals of Pb, Bi, Ag, Au, Te, Sb. Electron probe micro-analysis (EPMA) of complex telluride-sulphide intergrowths suggests that these intergrowths formed by co-crystallisation/replacement processes and not exsolution. Minor element chemical variation, in the sulphides and tellurides, indicates that antimony and cadmium are preferentially partitioned into telluride minerals. Mineral stability diagrams suggest that during gold deposition log bf aTe2 was between -7.9 and -9.7 and log bf aS2 between -12.4 and -13.8. Co-existing mineral assemblages indicate that the final stages of telluride mineralisation were between c. 250 - 275oC. It is suggested that the high-grade telluride ore shoot was the result of remobilisation of Au, Bi, Ag and Te from low grade mineralisation elsewhere within the vein system, and that gold deposition was brought about by destabilisation of gold chloride complexes by interaction with graphite, sulphides and tellurbismuth. Scanning electron microscopy of planer gold grains from the Southern Uplands, Scotland, indicates that detailed studies on the morphology of placer gold can be used to elucidate the history of gold in the placer environment. In total 18 different morphological characteristics were identified. These were divided on an empirical basis, using the relative degree of mechanical attrition, into proximal and distal characteristics. One morphological characteristic (a porous/spongy surface at high magnification) is considered to be chemical in origin and represent the growth of `new' gold in the placer environment. The geographical distribution of morphological characteristics has been examined and suggests that proximal placer gold is spatially associated with the Loch Doon, Cairsphairn and Fleet granitoids. Quantitative EPMA of the placer gold reveals two compositional populations of placer gold. Examination of the geographical distribution of fineness suggests a loose spatial association between granitoids and low fineness placer gold. Also identified was chemically heterogeneous placer gold. EPMA studies of these heterogeneities allowed estimation of annealing history limits, which suggest that the heterogeneities formed between 150 and 235oC. It is concluded, on the basis of relationships between morphology and composition, that there are two types of placer gold in the Southern Uplands: (i) placer gold which is directly inherited from a hypogene source probably spatially associated with granitoids; and (ii) placer gold that has formed during supergene processes.
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Books on the topic "Ysgol Dolgellau (Dolgellau, Wales)"

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Williams, E. Lloyd. Ysgol Dolgellau, Ffordd Penycefn, Dolgellau, Gwynedd LL40 2YW: Report on the inspection under section 10 of the School Inspection Act 1996 : school number: 661/3041 : date of inspection: 23-26 June 2003 = Ysgol Dolgellau, Ffordd Penycefn, Dolgellau, Gwynedd LL40 2YW : adroddiad ar yr arolwg o dan adran 10 Deddf Arolygu Ysgolion 1996 : rhif yr ysgol: 661/3041 : dyddiad yr arolwg: Mehefin 23-26 2003. Cardiff: Estyn, 2003.

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Hill, Mary. School in a valley. Harlow: Longman, 1994.

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Elliott, Tony. Machreth Primary School, Llanfachreth, Dogellau, Gwynedd LL40 2DY: Inspection under section 10 of the School Inspections Act 1996 : school number: 661/3037 : date of inspection: 16/03/98-18/03/98 = Ysgol Gynradd Machreth, Llanfachreth, Dolgellau, Gwynedd LL40 2DY : arolygiad o dan Adran 10 o Ddeddf Arolygiadau Ysgolion 1996 : rhif ysgol: 661/3037 : dyddiad arolygiad 16/03/98-18/03/98. Cardiff: Welsh Office, 1998.

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Wynne, Rolant N. Llanelltyd Primary School, Llanelltyd, Dolgellau LL40 2TA: Inspection under section 10 of the School Inspections Act 1996 : school number: 661/2197 : date of inspection: 24/2/98-26/2/98 = Ysgol Gynradd Llanelltyd, Llanelltyd, Dolgellau LL40 2TH : arolygiad dan adran 10 Deddf Arolygu Ysgolion 1996 : rhif yr ysgol: 661 2197 : dyddiad arolygiad: 24/2/98-26/2/98. Cardiff: Welsh Office = Swyddfa Gymreig, 1998.

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Elliott, Tony. Ysgol Ieuan Gwynedd, Rhydymain, Dolgellau, Gwynedd, LL40 2YW: Arolygiad dan Adran 9 o Ddeddf Addysg (Ysgolion) 1992 : rhif ysgol 573/2215 : dyddiad arolygiad 1995. (Cardiff): (Welsh Office), 1995.

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Selleck, Dorothy. Yr Ysgol Gynradd Ganllwyd, Dolgellau, Gwynedd, LL40 2TG: Arolygiad dan Adran 9 o Ddeddf Addysg (Ysgolion) 1992 : rhif ysgol 573/2191 : dyddiad arolygiad: Mehefin 6ed - Mehefin 7fed, 1995. (Cardiff): (Welsh Office), 1995.

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Marshall, Jean. Ysgol y Ganllwyd, Y Ganllwyd, Dolgellau, Gwynedd LL40 2TG: Inspection under section 10 Inspection of Schools Act 1996 : school number: 661/2191 : date of the inspection: 15-16 January 2002 = arolygiad dan adran 10 Deddf Arolygu Ysgolion 1996 : rhif yr ysgol: 661/2191 : dyddiad arolygiad: 15-16 Ionawr 2002. Cardiff: Estyn, 2002.

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Inspectorate, Great Britain Welsh Office Education Department. Inspection under section 9 of the Education (Schools) Act 1992: Ysgol y Gader ... Dolgellau = Arolygiad dan adran 9 o Ddeddf Addysg (Ysgolion) 1992 : Ysgol y Gader ... Dolgellau. Cardiff: Welsh Office, 1993.

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Assefa, Desta Dimtse. Public participation in forest management in Dolgellau Forest District Lake Vyrnwy Wales. Wolverhampton: University of Wolverhampton, 2001.

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Great Britain. Welsh Office. Education Department. Inspectorate. Report by H.M. Inspectors assisted by a social services inspector on Ysgol Hengwrt, Dolgellau, Gwynedd: Inspected during Autumn Term 1990. Cardiff: Welsh Office, 1990.

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