 | Gloaguen, Eric, Branquet, Yannick, Boulvais, Philippe, Moëlo, Yves, Chauvel, Jean-Jacques, Chiappero, Pierre-Jacques, Marcoux, Eric (2007) Palaeozoic oolitic ironstone of the French Armorican Massif: a chemical and structural trap for orogenic base metal–As–Sb–Au mineralisation during Hercynian strike-slip deformation. Mineralium Deposita, 42 (4) 399-422 doi:10.1007/s00126-006-0120-4 | Journal (article/letter/editorial) | | the Saint-Aubin-des-Châteaux quarry (Armorican Hercynian belt, western France), an epigenetic hydrothermal...de Saint Amand, BP 6759, 45067 Orleans Cedex 2, France e-mail: e.gloaguen@brgm.fr P. Boulvais : J.-J....CNRS/Université de Rennes 1, 35042 Rennes Cedex, France Y. Moëlo Laboratoire de Chimie du Solide, Institut...la Houssinière, BP 32229, 44322 Nantes Cedex 3, France P.-J. Chiappero Département Histoire de la Terre...d’Histoire Naturelle, 61 rue Buffon, 75005 Paris, France Present address: E. Gloaguen BRGM, 3, avenue Claude-Guillemin |  | | Journal (article/letter/editorial) | | plagioclase contents. The Schuitdrift Gneiss yielded U-Pb zircon ages of 1 191 ± 7 and 1 187 ± 6 Ma. Introduction...Gneisses were first recognised and mapped by Du Plessis (1979) as the “Yas Granite” and “Schuitdrift Granite”...well exposed in a small defunct dimension stone quarry, situated in a small hill about 500 m west of the...Southern Farms (Figure 1, 28°33’52”S; 19°45’59”E). The quarry is easily accessed via a short track or on foot...Naros Granodiorite (~1 110 Ma, Komsberg Suite; Du Plessis, 1986; Bial et al., 2015; Macey et al., 2015; Smith |  | | Journal (article/letter/editorial) | | Amsterdam - Printed in The Netherlands I33 U-Pb ZIRCON DATING OF VOLCANIC ROCKS, CLOSE TO THE SILURIAN-DEVONIAN...SILURIAN-DEVONIAN BOUNDARY, FROM VENDEE (WESTERN FRANCE) J.J. PEUCAT’, ’ Centre Amoricain F. PARIS’ d’Etude...GCochimie-Rennes CBdex (France) Universite de Rennes Z, GRECO 7 du C.N.R.S. F-35042 Rennes Cedex (France) Universite...Universite de Poitiers, F-86022 Poitiers Cedex (France) for publication June 3, 1986) Abstract Peucat, J.J...J., Paris, F. and Chalet, M., 1986. U-Pb zircon dating of volcanic rocks, close to the Silurian-Devonian |  | | Book (volume) | | l’Institut Muséum d’histoire naturelle DE LA FRANCE ET SES COLONIES DK description physique et chimique...strüvérite et la inonazite. MINÉHALÜGIE DE IA FRANCE 4 lima paru dès le premier abord vraisemblable...0;09 1120 10,90 : ana- MlNKliALOGIK DK (i FRANCE ],A (>nOUPE DE L’APATÏTE APATITE Anjou. (T...0,3930 : 1 : 0,4339] 8 MINÉKALOGIE DE LA FRANCE Ces nouvelles données permettent de simplifier.../r"(o30), lŸ (320). (443), dü MINÉRALOGIE DE LA FRANCE — Madagascar. La région minière d’Andavakoera |  | | Journal (article/letter/editorial) | | shown, based on authors’ unpublished data. (du Plessis, 1987; Callaghan et al., 1991), a long-lived, lithospheric-scale...Moshaneng Complex (Figure 4), which has yielded a U–Pb zircon age of 2054 ± 2 Ma and is considered to relate...Mokapane (formerly Potgietersrus) (Figure 2; du Plessis, 1978). Regression through five discordant analyses...Sample JP10z was collected within the Moshaneng Quarry, where the dolerite is currently being exploited...pyroxene fraction from dolerite at the Moshaneng Quarry (Jones and McElhinny, 1966), near our sites JP9 |  | | Journal (article/letter/editorial) | | low-temperature thermochronometry (apatite and zircon fission-track dating) (Brown et al., 1990; Tinker...1992). Muir et al. (2018) report preliminary U-Pb zircon ages from the Kirkwood Formation (which underlies...more prominent towards the top of the formation. Quarry on Hartenbosch 217 north of Mossel Bay. (E) Very...some of the clasts showing in-situ fracturing. Quarry on Hartenbosch 217. (G) Cross-bedded sandstone...conglomerate showing some water escape structures in the quarry on Hartenbosch 217. SOUTH AFRICAN JOURNAL OF GEOLOGY |  | O'Hara, Matthew J., Kellogg, Cyndi M., Parker, Cyrena M., Morrison, Samuel S., Corbey, Jordan F., Grate, Jay W. (2017) Decomposition of diverse solid inorganic matrices with molten ammonium bifluoride salt for constituent elemental analysis. Chemical Geology, 466. 341-351 doi:10.1016/j.chemgeo.2017.06.023 | Journal (article/letter/editorial) | | range of inorganic sample types: glass, quartz, zircon, soil, and pitchblende ore. Method performance...(NH4F·xHF), where x is commonly 1, 1.5, and 2 (du Plessis et al., 2016; Rakov and Mel'nichenko, 1984). Ammonium...reference material GSP-2 (Wilson, 1998). Refractory zircon phases within the rock, as indicated by recoveries...including glass, the refractory minerals quartz and zircon, and NIST soil and AQCS uranium ore standard reference...treatment was sufficient for all samples except zircon. Additionally, the ABF decomposition and sample |  | | Journal (article/letter/editorial) | | technique d’bvaporation du Pb sur monocristaux de zircon. Ces don&es fournissent des ages minimums s’btalant...methode d’evaporation du Pb sur monocristaux. de zircon, s’btalent entre 2880 + 2 et 2846 + 22 Ma depuis... 1977; Michaluk and Moen, 1991; Keyser and du Plessis, 1993; Schutte, 1994). Where exposed, the granitoid...recent years, involving the precise dating of single zircon grains, have led to a number of studies aimed at...spillway (Michaluk and Moen, 1991; Keyser and du Plessis, 1993); iii fine- to medium-grained grey or pink |  | | Journal (article/letter/editorial) | | nonkuselonkusie@gmail.com ABSTRACT In the Bandelierkop Quarry (South Marginal Zone of the Limpopo belt) two generations...by the L1 leucosomes (Taylor et al., 2014). U─Pb zircon ages of 2714 ± 6 Ma and 2713 ± 5 Ma respectively...500 ms with a 0.5 mm thick Cu beam filter (Du Plessis, le Roux, & Guelpa, 2016). The data reconstructions...number of sections from the migmatitic Bandelierkop quarry and small euhedral plagioclase inclusions were...concluded that partial melting at the Bandelierkop Quarry produced garnet as the only ferromagnesian silicate |  | | Journal (article/letter/editorial) | | folded Palzeozoic rocks continuous with those of Brittany, and forming part of the Armorican massif. In...conglomerates; coal-bearing beds of Littry and Plessis. Visean: Regneville limestone with Chonetes comoides...which have been worked at Littry (Calvados) and at Plessis near Carentan. Andesitic lava flows are intercalated...very hard quartzites with tourmaline, futile and zircon in micaceous bands. (c) The Calymene Shales are...the same age as the Carboniferous granites of Brittany (Rostrenen, Huelgoat). 5. Hag u e mas s if is |  | | Journal (article/letter/editorial) | | quartz-filled faults cross-cut the pluton. U-Pb zircon dating of the Stolzenfels Enderbite yielded a concordia...been mapped as the “Stolzenfels Enderbite” by Du Plessis (1979, 1986), Moen and Toogood (2007) and Macey...antiperthite. Magnetite is the main accessory mineral (Du Plessis, 1979). Not all samples contain orthopyroxene....pluton is presented here, 14 of which are from Du Plessis (1986). An additional 147 analyses of Komsberg...rocks are also shown for comparison (data from Du Plessis, 1986; Macey et al., 2015; Macey, unpublished data) |  | | Journal (article/letter/editorial) | | in keeping with recently published U-Pb single zircon ages of 3.1 Ga obtained on tonalitic gneisses adjacent...the Witwaterstand basin (De Wit, 1991). Recent zircon data (De Wit et al., 1993) constraining the age...Pietersburg and Sutherland greenstone belts, give precise zircon ages of 3.1 and 2.87 Ga (Barton, 1990; Brandl and...their protoliths. If the interpretation of the zircon data is correct, it means crustal growth through...consistent Rb-Sr and Pb-Pb whole rock ages and U-Pb zircon ages between 2.7 and 2.65 Ga (Barton, 1990). These |  | | Journal (article/letter/editorial) | | of kilometers. New SHRIMP age determinations on zircon from tuff bands revealed however, that the top...(1986) and Clendenin (1989), not confirmed by zircon ages from intercalated tuff layers 128 SW GriquatowniF...sub-basins and correlation is not confirmed by zircon ages from intercalated tuff layers. Half-arrowsand...Transvaal were described in detail by Page and Du Plessis (1986). The Mooiplaas mine is situated in the southwestern...cement production plant is located next to the quarry activities. Mined are partly dolomitized giant |  | | Journal (article/letter/editorial) | | the result of a considerably younger event. U-Pb zircon SHRIMP ages on sedimentary as well as volcanic...Cape Conductive Belt (De Beer and Meyer, 1984; Du Plessis and Thomas, 1991). The interface between the Namaqua-Natal...limit of the Namaqua Orogeny. Despite many bulk zircon and whole-rock age determinations published in...Gg=granite gneiss, Mig=migmatitic paragneiss (zircon), Q=quartzite (zircon). Lithostratigraphic unit Wilgenhoutsdrif... It displays Table 2. Samples used in the U-Pb zircon investigation. Sample No. Lithostratigraphic unit |  | | Journal (article/letter/editorial) | | Jansen (19821 gives a maxtmum of 6000 m. and du PlessIs ( 1987) a figure of 7000 m or (quoted in a paper...T%zkelI(1975); De Bruiyn (1971a. 1971b. 1972a. 1972b); Du Plessis (1972a. 1972b): Jansen (1969,1970a, 1970b. 1975a...in the MainBasin. and correlates sequences. Du Plessis ( 19871 studied rocks lying to it with the Wilge...Sterk River Formation grades laterally into the du Plessis supported Jansen’s original theories of Alma Formation...berg Formation In the southwest. These in turn Plessis and Walraven (19901 suggest a pull-apart grade |  | | Journal (article/letter/editorial) | | Thrust (BWT) (Figures 1 and 2; Du Plessis and Clendenin, 1988; Du Plessis, 1990). Duplication is accentuated...of earlier D2 structures along the BWT (e.g. Du Plessis and Clendenin, 1988). Notably, Martin (1990), observed...the Kaapvaal Craton as inferred from precise U-Pb zircon ages from volcanoclastic sediments. Sediment. Geol...and Armstrong, R.A., (2006). Precise SHRIMP U-Pb zircon age constraints on the lower Waterberg and Soutpansberg...South African Journal of Geology, 109, 139–156. Du Plessis C.P., (1990). Tectonics along the Thabazimbi-Muchison |  | | Journal (article/letter/editorial) | | 362±370 Ó Springer-Verlag 1997 ARTICLE G. du Plessis á G.J. Jonck á R. Kruger Potential low-grade iron...in the Editorial handling: P.G. Eriksson G. du Plessis (&) á R. Kruger Geology, Iron Ore Business, Iscor...lens-shaped bodies of serpentinite and chromitite (Du Plessis 1996). Intrusive pegmatite veins and diabase dykes...Strongly magnetic Liberation Pyrrhotite Hematite Zircon 6.69 1.32 1.01 Weakly magnetic Garnet Quartz...Geological Society South Africa pp 461±467 Du Plessis G (1996) Iron ore geology, strategic business plan |  | Beukes, N.J., de Kock, M.O., Vorster, C., Ravhura, L.G., Frei, D., Gumsley, A.P., Harris, C. (2019) The age and country rock provenance of the Molopo Farms Complex: implications for Transvaal Supergroup correlation in southern Africa. South African Journal of Geology, 122 (1) 39-56 doi:10.25131/sajg.122.0003 | Journal (article/letter/editorial) | | Molopo Farms Complex in South Africa, and an U-Pb zircon date of 2 056 ± 10 Ma from a highly altered and...core intersections are U-Pb LA-ICP-MS detrital zircon age data from quartzite samples of both the floor...floor and roof country rock. The roof rock detrital zircon age populations are comparable to those of the...glacial units (Gumsley et al., 2017). Detrital zircon data from the Postmasburg Group (Beukes et al....post-Bushveld Thabazimbi-Murchison Lineament (Du Plessis and Walraven, 1990), which is represented by the |  | JAGUIN, J., GAPAIS, D., POUJOL, M., BOULVAIS, P., MOYEN, J.- F. (2012) THE MURCHISON GREENSTONE BELT (SOUTH AFRICA): A GENERAL TECTONIC FRAMEWORK. South African Journal of Geology, 115 (1) 65-76 doi:10.2113/gssajg.115.1.65 | Journal (article/letter/editorial) | | Rennes 1, Campus de Beaulieu, 35042 Rennes CEDEX, France. e-mails: justine.jaguin@univ-rennes1.fr, denis...Geochronological data are reported in Table 1. The La France Formation is a small area in the south-centre part...in the vicinity of the Sb-Au mines (Malati Pump quarry, Athens Shaft, Gravelotte, e.g. Pearton and Viljoen... Method: (A) Pb-Pb zircon evaporation; (B) U-Pb zircon LA-ICPMS; (C) U-Pb zircon ID-TIMS. References:..., 1997), the Baderoukwe orthogneiss (concordia zircon age of 2969 ± 12 Ma, Jaguin et al., to be published) |  | | Journal (article/letter/editorial) | | Namaqua-Natal Province Hartbees River Thrust Microbeam zircon dating Augrabies Granite Gneiss Karama’am Granite...times deduced from Lu–Hf isotopic compositions of zircon cores and xenocrysts, cluster around 1710 Ma for...region, which is situated 152 Table 1A U–Pb zircon data by laser ablation muliticollector ICPMS. Data...Bever Donker, 1980; the Narries Formation of Du Plessis, 1979; the Blouputs Formation of Praekelt, 1984;...1973; Praekelt, 1984; the Witwater gneiss of Du Plessis, 1979; Praekelt, 1984). The Bladgrond Terrane consists |  | | Journal (article/letter/editorial) | | Geochronology The majority of isotopic ages (single-grain zircon Pbevaporation) determined from samples of the Rooiberg...Waterberg Group sedimentary rocks, Rhodes and Du Plessis (1976) described the Rooiberg Group as a 3-kmthick...more than 5 km (Von Gruenewaldt, 1968, 1972; Du Plessis, 1976; Clubley-Armstrong, 1977). This volume is...D. thesis, University of Orange Free State. Du Plessis, M.D., 1976. The Bushveld Granites and associated...The Okwa basement complex, western Botswana: U–Pb zircon geochronology and implications for Eburnean processes |  | | Journal (article/letter/editorial) | | minerals including hematite, pyrite, pyrrhotite, zircon, molybdenite and galena. SiO2 content varies between...(Vearncombe et al., 1987; Vearncombe, 1988; Du Plessis, 1990; Vearncombe et al., 1992; Poujol et al.,...Pyrrhotite X Quartz X Scheelite X Talc X Zircon X X X X (Figure 7a and b). Swarms of inclusions...images of quartz, phenakite, hematite, pyrrhotite, zircon and molybdenite inclusions in sectioned emeralds...Euhedral pyrrhotite (Po) inclusions in emerald. (e) Zircon (Zr) with small inclusion of apatite (f) Elongated |  | | Journal (article/letter/editorial) | | VAN DER WESTHUIZEN AND D. FREI Microbeam U-Pb Zircon dating of the Makwassie Formation and underlying...pervasive 2.3 to 2.0 Ga alteration. In situ U-Pb zircon dating promises a panacea, but the effects of lead...reliably dated by the laser ablation ICPMS U-Pb zircon method on four samples with a combined age of 2720...by Yonsei University user 525 MICROBEAM U-PB ZIRCON DATING OF THE MAKWASSIE FORMATION AND UNDERLYING...affects whole rock dating as well as conventional zircon dating based on multigrain samples, e.g. 207 206 |  | Möller, V., Klemd, R., Joachimski, M., Barton, J.M. (2014) Hydrothermal controls on iron and lead mineralization on the farms Leeuwbosch and Cornwall, Thabazimbi District, South Africa. Ore Geology Reviews, 63. 40-63 doi:10.1016/j.oregeorev.2014.04.009 | Journal (article/letter/editorial) | | sequence, the siliciclastic 2642.2 ± 2.3 Ma old (zircon U–Pb age, Walraven and Martini, cited in Eriksson...Thabazimbi (Fig. 2) (Anhaeusser and Poujol, 2004; Du Plessis and Clendenin, 1988). The Black Reef Formation...Ma (SHRIMP U–Pb ages for zircon; Martin et al., 1998) and 2550 ± 3 Ma (zircon Pb-evaporation; Walraven...pinches out towards the northeast (Fig. 2; Du Plessis and Clendenin, 1988). To the east and north of... Ages of 2054 ± 4 and 2051 ± 8 Ma (SHRIMP U–Pb zircon ages; Dorland et al., 2006) were reported for lavas |  | | Journal (article/letter/editorial) | | DOKLADY EARTH SCIENCES Vol. 311, No. 3, 2011 SIMS zircon U-Pb geochronology and Sr-Nd isotopes of Ni-Cubearing...Australia—Michael F. Gazley, Julie K. Vry, Ettienne du Plessis, and Monica R. Handler A model of boiling for fluid...Pulak Sengupta, Sanjoy Sanyal, and D. Mukhopadhyay Zircon U-Pb and muscovite 40Ar/39Ar geochronology of the |
|
