 | | Journal (article/letter/editorial) | | African Plate: Evidence from Gharyan Lherzolite Xenoliths (Northern West Libya)1 Mohamed M. Hamdya, *, Youngwoo...Environment, Faculty of Science, Science, Al Mergab University, Al Khums, Libya *e-mail: mohamed.hamdy@science.tanta...Ma) of the NNW-SSE extending Gharyan Cenozoic volcanics (Northern West Libya) contains numerous fresh lherzolite...(hercynite–picotite–Al-rich chromite spinels with Cr# = 0.08–0.11) refer to the fertile nature of Gharyan peridotites...with high contents of Na2O, and enrichment of the Al-spinel in TiO2. The estimated pre-eruptive temperature |  | | Journal (article/letter/editorial) | | 2010: pp. 0–0 International J.D. Keppie etGeology al. Review J. Duncan Keppiea*, J. Dostalb and J. B...and Tibesti-Gharyan swells that consist of Precambrian rocks overlain by Cenozoic volcanic rocks. The...collision between Africa and Europe. The Cenozoic volcanic rocks in the Hoggar generally range from Oligocene...their identification are not unique (e.g. Foulger et al. 2005; Foulger and Jurdy 2007). However, two of the...and from approximately 670 km depth (Montelli et al. 2004, 2006). However, such low-velocity zones may |  | | Report (chapter) | | petrological evidence from the Gharyan lherzolite xenoliths, NW Libya L. BECCALUVA1, G. BIANCHINI1, R...G75 0QF, UK 3 Geology Department, Al-Fateh University, Tripoli, Libya Abstract: The Neogene– Quaternary...alkali-basalt – hawaiite lavas of the Gharyan volcanic field (NW Libya) contain mantle xenoliths. These mostly...and brown spinel destabilized in a higher Cr/(Cr þ Al) black vermicular aggregate (sp2) generally associated...sub-lithospheric component. The relatively low 3He/4He of the Gharyan xenoliths (5.3–6.5 Ra) indicates that this component |  | | Journal (article/letter/editorial) | | compositions; SC Tatsumi et al., 1999; Downes et al., 2005; Pilet et al., 2008). These alkaline melts...non-alkaline magmatic series can occur (Marks et al., 2008). As an example, fractionation of small amounts...contents during fractional crystallization (Marks et al., 2008). Very incompatible element with similar geochemical...twins, namely Nb/Ta and Zr/Hf (Weyer et al., 2003; Pfander et al., 2007). Recent studies however pointed...ratios increase during differentiation (e.g., Marks et al., 2008), implying that the partition coefficients |  | Cucciniello, C., Tucker, R. D., Jourdan, F., Melluso, L., Morra, V. (2016) The age and petrogenesis of alkaline magmatism in the Ampasindava Peninsula and Nosy Be archipelago, northern Madagascar. Mineralogy and Petrology, 110 (2) 309-331 doi:10.1007/s00710-015-0387-1 | Journal (article/letter/editorial) | | Bobaomby (Cap d’Ambre) and Massif d’Ambre primitive volcanic rocks. These geochemical features are broadly...(92–84 Ma; Cucciniello et al. 2010, 2011a, 2013; Melluso et al. 2005; Storey et al. 1995) and is characterized...Precambrian basement (e.g., Melluso et al. 2001; Cucciniello et al. 2013 and references therein). The second... and (iii) Pleistocene – Recent (e.g., Tucker et al. 2008 and references therein). The igneous rocks...Ankaizina district; e.g., Melluso and Morra 2000; Buchwaldt et al. 2005; C. Cucciniello et al. Cucciniello |  | Melluso, L., Tucker, R.D., Cucciniello, C., le Roex, A.P., Morra, V., Zanetti, A., Rakotoson, R.L. (2018) The magmatic evolution and genesis of the Quaternary basanite-trachyphonolite suite of Itasy (Madagascar) as inferred by geochemistry, Sr-Nd-Pb isotopes and trace element distribution in coexisting phases. Lithos, 310. 50-64 doi:10.1016/j.lithos.2018.04.003 | Journal (article/letter/editorial) | | Pleistocene-Holocene volcanic field in central Madagascar, located to the west of the ED Ankaratra volcanic complex...flows, covering an area of ab. 400 km2. The last volcanic episodes PT probably dated ca. 6000-7100 y BP;...volcanism (Woolley, 2001; Tucker et al., 2008; Cucciniello et al., 2011, 2016, 2017), which crops out...the island (Nicollet, 1984; Piqué et al., 1999; Cucciniello et al., 2016, 2018). The changing ages and...(Tucker et al., 2014; Melluso et al., 2016; Cucciniello et al., 2018). The central field of alkaline |  | | Book | | geology of North Africa, this book deals with Egypt, Libya, Algeria, Tunisia and Morocco. In great detail the...and revised version of ‘The Geology of Egypt and Libya’ by the same author (Balkema, 2001). Ed Tawadros...consulting and major oil companies in Egypt, Canada, Libya, Argentina and other countries. With a rich research...xv xvii xix PART 1 1.1 1.2 1.3 1.4 1.5 Egypt Libya Algeria Tunisia Morocco TECTONIC FRAMEWORK OF NORTH...assemblages 5.2.3.2 Ophiolite assemblages 5.2.3.3 Volcanic-arc assemblages 83 83 86 87 87 91 91 92 92 92 |  | Cucciniello, Ciro, Melluso, Leone, le Roex, Anton P., Jourdan, Fred, Morra, Vincenzo, de’ Gennaro, Roberto, Grifa, Celestino (2017) From olivine nephelinite, basanite and basalt to peralkaline trachyphonolite and comendite in the Ankaratra volcanic complex, Madagascar: 40 Ar/ 39 Ar ages, phase compositions and bulk-rock geochemical and isotopic evolution. Lithos, 274. 363-382 doi:10.1016/j.lithos.2016.12.026 | Journal (article/letter/editorial) | | trachyphonolite and comendite in the Ankaratra Volcanic Complex, Madagascar: 39Ar/40Ar ages, phase compositions...trachyphonolite and comendite in the Ankaratra Volcanic Complex, Madagascar: 39Ar/40Ar ages, phase compositions...trachyphonolite and comendite in the Ankaratra Volcanic Complex, Madagascar: 39Ar/40Ar ages, phase T...del Sannio, Italy Abstract D The Ankaratra volcanic field covers an area of ~3800 km2 in central Madagascar...emplaced at different ages (Miocene to Recent). The volcanic products include ultramafic-mafic (olivine-leucite |  | Melluso, Leone, Guarino, Vincenza, Lustrino, Michele, Morra, Vincenzo, de' Gennaro, Roberto (2017) TheREE-and HFSE-bearing phases in the Itatiaia alkaline complex (Brazil) and geochemical evolution of feldspar-rich felsic melts. Mineralogical Magazine, 81 (2) 217-250 doi:10.1180/minmag.2016.080.122 | Journal (article/letter/editorial) | | nepheline syenites, quartz-syenites, granites, high-field-strength elements, rare-earth elements, Itatiaia...accessory phases, 2005; Gomes et al., 2011; Motoki et al., 2010; Geraldes et al., 2013; Fig. 1a). The alkaline...at ∼85–90 Ma (Morbidelli et al., 1995; Thompson et al., 1998; Guarino et al., 2013). The earliest intrusions...basin (133 ± 2 Ma; Renne et al., 1992; Turner et al., 1994; Janasi et al., 2011), but the most abundant...activity postdates them by over LEONE MELLUSO ET AL. FIG. 1. (a) Alkaline provinces of southeastern |  | | Report (volume) | | fertile spinel lherzolites from the Viliga Volcanic Field in NE Russia SEGHEDI , I., NTAFLOS , T. & PÉCSKAY...petrological evidence from the Gharyan lherzolite xenoliths, NW Libya PERINELLI , C., ORLANDO , A., CONTE...reaction (Coltorti et al. 2000), (2) in situ melting (Chazot et al. 1996; Yaxley et al. 1997), (3) decompressional...phlogopite (e.g. Grégoire et al. 2000; Moine et al. 2001; Coltorti et al. 2007a). Another revolution is...wedges (e.g. Smith et al. 1999; Grégoire et al. 2001; McInnes et al. 2001; Ishimaru et al. 2007). Most of |
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