 | | Report (chapter) | | granulite-facies metapelites of Tidjenouine (Central Hoggar, Algeria): witness of the LATEA metacratonic evolution ABDERRAHMANE...Eburnean and Pan-African orogenies. The Tidjenouine area in the Laouni terrane belongs to the LATEA metacraton...present a detailed petrological study coupled with in situ U âPb zircon dating by laser-ablation inductively...on the basis of textural relationships, modelling in KFMASH and FMASH systems and thermobarometry. The...main metamorphic events are Eburnean in age. The PanAfrican orogeny, in contrast, is associated mainly with |  | | Book | | at researchers, students, and everyone interested in geology. The series includes peer-reviewed monographs...Science and Technology Houari Boumediene Algiers, Algeria Zakaria Hamimi Department of Geology Benha University...Science and Technology Houari Boumediene Algiers, Algeria Basem Zoheir Department of Geology Benha University...Science and Technology Houari Boumediene Algiers, Algeria ISSN 2197-9545 ISSN 2197-9553 (electronic) Springer...recitation, broadcasting, reproduction on microïŹlms or in any other physical way, and transmission or information |  | | Journal (article/letter/editorial) | | assemblages preserved in ultrahigh-temperature granulites from In Ouzzal (Hoggar, Algeria) Z. ADJERID,1,3 G...Naturelles, B.P. 92, Vieux Kouba, Alger, 16050, Algeria 2 Institut de Physique du Globe, Sorbonne Paris...Alger, 16111, Algeria 4 Univ. Paris-Diderot, Paris 7, France ABSTRACT Osumilite is reported in Palaeoproterozoic...granulites from the Khanfous area (Tekhamalt, In Ouzzal, Hoggar, Algeria). The main peak assemblages are osumilite...orthopyroxene + sillimanite + quartz biotite (K-feldspar) in silica-deficient and silica-saturated granulites |  | | Journal (article/letter/editorial) | | Zebane dyke swarm ĆŸPan-African Tuareg shield, Algeria /: prevalent mantle signature and late agpaitic...located along the western boundary of the Archaean In Ouzzal rigid terrane, but inside the adjacent Tassendjanet...at that period. No crustal contamination occurred in the genesis of the Tin Zebane swarm. Even the samples...granites: this geochemical signature is interpreted in terms of extensive differentiation effects due to...and possibly fergusonite, separated from the liquid in the swarm itself due to magmatic flow turbulence |  | | Journal (article/letter/editorial) | | Springer-Verlag 1995 Gold mineralization in the West Hoggar shear zone, Algeria K. Ferkous 1, M. Leblanc 2 10.R...M., 8 rue des Aur6s, E1 Harrach, 16000 Alger, Algeria 2 C.N.R.S., Centre G6ologiqueet G6ophysique,Un...fault of the Pharusian Belt of the Tuareg Shield (Algeria). The Amesmessa shear zone is asymmetric: strong...biotitic ultramylonites are in contact with a rigid Archean complex (In Ouzzal block), whereas there is...(pyrite, galena, native gold, sphalerite) crystallized in the deformed quartz matrix along late shear planes |  | Fezaa, Nassima, LiĂ©geois, Jean-Paul, Abdallah, Nachida, Cherfouh, El Hadi, De Waele, Bert, Bruguier, Olivier, Ouabadi, Aziouz (2010) Late Ediacaran geological evolution (575â555Ma) of the Djanet Terrane, Eastern Hoggar, Algeria, evidence for a Murzukian intracontinental episode. Precambrian Research, 180 (3) 299-327 doi:10.1016/j.precamres.2010.05.011 | Journal (article/letter/editorial) | | (575â555 Ma) of the Djanet Terrane, Eastern Hoggar, Algeria, evidence for a Murzukian intracontinental episode...GĂ©ologie de lâingĂ©nieur et PlanĂ©tologie, USTHB, Algeria Isotope Geology, Royal Museum for Central Africa...GĂ©ographie, BP 32, El Alia, Bab Ezzouar, 16111 Alger, Algeria d FacultĂ© des Sciences Biologiques et des Sciences...GĂ©ologie de lâingĂ©nieur et PlanĂ©tologie, USTHB, Algeria e SRK Consulting, 10 Richardson Street, West Perth...Article history: Received 18 September 2009 Received in revised form 25 February 2010 Accepted 5 May 2010 |  | | Journal (article/letter/editorial) | | V., Amsterdam - Printed in The Netherlands Location of extraneous argon in granulitic-facies minerals:...and Rahmani, A., 1990. Location of extraneous argon in granulitic-facies A paired microprobe-laser probe...investigated minerals from the In Ouzzal granulitic unit (Sahara, Algeria). As excess 40Ar frequently occurs...laser probe technique in an attempt to determine the location of the excess component in the minerals. Combining...found to be located on the rim of the biotite and in the microcracks of the pyroxene and garnet which |  | | Journal (article/letter/editorial) | | spinelâquartz parageneses in AlâMg granulites from In Hihaou, In Ouzzal, Hoggar K . OU Z EG A NE AN D S ... Algiers, Algeria A B S TR A CT Quartz AlâMg granulites exposed at In Hihaou, In Ouzzal (NW Hoggar)...Grt+Crd+SilÂSpl+Qtz and (8) Grt+SilÂSpl+Qtz. Minerals in quartz AlâMg granulites display compositional variations...textures and the evolution of the mineral assemblages in the quartz AlâMg granulites indicate a clockwise...temperature of at least 900 °C. Key words: granulite; In Ouzzal, Hoggar; PâT path; ultrahigh-temperature metamorphism |  | | Journal (article/letter/editorial) | | compositions in rhyo-ignimbrites in the In Hihaou (In Zize) Magmatic Center, central Ahaggar, Algeria Serge...Cedex 05, France Abstract. The 620 M.y.-old in Hihaou (In Zize) magmatic complex located at the north-western...north-western boundary of the Archaean In Ouzzal block (western Ahaggar), is composed of massive alkaline...granophyric and granitic body. The whole is preserved in a cauldron structure. Extrusive rocks are strongly...within the upper parts of plutonic complexes and in the surrounding rocks, by means of large-scale hydrothermal |  | Audibert, N., Bertrand, P., Hensen, B. J., Kienast, J.-R., Ouzegane, Kh. (1993) Cordierite-K-feldspar-quartz-orthopyroxene symplectite from southern Algeria: new evidence for osumilite in high-grade metamorphic rocks. Mineralogical Magazine, 57 (387) 354-357 doi:10.1180/minmag.1993.057.387.20 | Journal (article/letter/editorial) | | 354 SHORT COMMUNICATIONS observed in close association with the sodiumzippeite on several specimens...Botallackite was also recorded within the mine, but not in association with sodium-zippeite. Gypsum, johannite...earlier draft of this paper and for access to specimens in the NHM collections and Dr. G. Ryback for assistance...analytical instrumentation. References Alwan, A. K. and Williams, P. A. (1980) Mineral. Mag., 43,665-7...bestimmenden Mineralogie, Vienna. [Not seen: quoted in Frondel (1958)] James, C. C. (1947) Trans. Roy. Geol |  | | Journal (article/letter/editorial) | | 5005, Australia Received 20 February 2007; received in revised form 30 May 2007; accepted 4 June 2007 Available...commonly occur in MgâAl-rich rock compositions that are unfortunately relatively rare in nature. These...for extracting information from mineral assemblages in conjunction with mineral chemistry, e.g. the aluminium...been proposed for the generation of UHT conditions in the deep crust. The two fundamental types of orogenic...proposed to be potential sites for UHT metamorphism. In contrast to current geodynamic models that are typically |  | | Journal (article/letter/editorial) | | 18, 345â358 Ultra-high-temperature metamorphism in Central Brazil: the Barro Alto complex R. DE MORAES...conditions are recorded by parageneses that occur in some lenses of quartz-bearing rock (metagranite,...(recording the former presence of melt with quartz in excess), which is replaced by either orthopyroxene+sillimanite...around the [Sa] invariant point, which appears only in a petrogenetic grid with inverted topology. The topology...regional granulite facies terranes have peak conditions in the range 7.5±1 kbar and 800±50 °C (Bohlen, 1987) |  | | Report (chapter) | | discovered in Al âMg granulites from the Khanfous area (In Ouzzal metacraton, Hoggar, Algeria) Z. ADJERID1...ADJERID1, K. OUZEGANE2, G. GODARD3 & J. R. KIENAST4 1 Ecole Normale SupeÌrieure, B.P. 92, Vieux Kouba, 16500...Khanfous area from the Archaean In Ouzzal granulite terrane (Western Hoggar, Algeria) preserves exceptional thermal-peak...ĂŸ quartz and sapphirine ĂŸ orthopyroxene ĂŸ quartz, in quartz-rich AlâMg granulites. Reaction textures coupled...Khanfous area, as well as the entire northern In Ouzzal metacraton, experienced ultrahigh-temperature |  | | Journal (article/letter/editorial) | | e and sapphirine parageneses in Archaean rocks from the Hoggar, Algeria J. R. Kienast Laboratoire de...Paris, France and K. Ouzegane U.S. T.H.6. - I.S. T.,6.f.9, Dar el Beida, Alger, Algeria An orthopyroxene-sillimanite...association occurs in AI-Mg rich granulites within Archaean aluminous metapelites at In Hibaou (NW Hoggar)...Hoggar). Sapphirine is characteristically present in those rocks as a reaction product of a high pressure...geothermometers and geobarometers to the observed parageneses in the two metamorphic events gives the following P-T |  | | Journal (article/letter/editorial) | | g AlâMg granulites from Ihouhaouene, In Ouzzal, Hoggar, Algeria: an example of phlogopite stability at...phlogopite, K-feldspar, plagioclase and variable quartz from Ihouhaouene (In Ouzzal, Algeria), display...decompression path is obtained from the paragenetic analysis in the FMAS system. However, according to current KFMASH...interpreted as the effect of the high content of F in phlogopite which should shift its stability limit...consequences of this shift on the phase relationships in the KFeMASH system are investigated and it is concluded |  | | Journal (article/letter/editorial) | | early CO2 fluids in the ultrahigh-temperature granulites of Ihouhaouene (In Ouzzal, Algeria) Michel Cuney...inclusion studies in rocks from the Lower Proterozoic granulites from western Hoggar (Algeria) provide new... CO2 inclusions represent the main fluid trapped in the Ihouhaouene ultrahigh-temperature (over 1000...of CO2 with minor amounts of CH4 and N2 detected in some inclusions (b 4 mol% CH4). Carbonic fluid densities...to 0.57 g/cm3. The highest densities are recorded in superdense carbonic inclusions presenting evidence |  | | Journal (article/letter/editorial) | | carbonatites (In Ouzzal Proterozoic granulites, Hoggar, Algeria) S . F OU RC A DE , 1 J . - R. K I EN A ST...ST 2 A N D K . O UZ E G AN E 3 1 GeÌosciences Rennes, University of Rennes 1, Campus de Beaulieu, 35042...B.P. 9, Dar el Beida, Algiers, Algeria A B S TR A CT The In Ouzzal granulitic unit (IOGU ) consists...metamorphism. Most of the isotopic variation in the marbles is explained in terms of pregranulitic features. Metasomatic...with respect to these elements, a relative depletion in Nb, Ta, Hf, Zr and Ti. The isotopic compositions |  | | Journal (article/letter/editorial) | | study of phase relations involving osumilite in the system K,O-Fe0-Mg0-AI2O3-SiO2-H2O at high pressure and...cordierite (Crd), osumilite (Osu), sillimanite (Sil), K-feldspar (Kfs), quartz (Qtz) and a water-undersaturated...liquid (Liq) have been determined experimentally in the system KFMASH (K20-Fe0-Mg0-A1203-Si0,-H,0) under...KFMASH system in the presence of quartz, orthopyroxene and liquid. Osumilite has been found in various mineral...assemblages from 950 to 1100°C and 7.5 to 11 kbar. In the temperature range 1OOO-1100" C, the pair 0s-Grt |  | | Journal (article/letter/editorial) | | Evolution of the Precambrian In-Ouzzal block (Central Sahara, Algeria) H. Haddoumâ, P. Choukroune**b...to constrain the evolution of the Precambrian In-Ouzzal block situated on the eastern side of the West...rocks which can be compared with those described in Archaean supracrustal terrains. (ii) The entire block...second phase. (iv) The major tectono-metamorphic event in the area is related to a 2.0 Ga-old (Ebumian) orogeny...erased by the Eburnian event. 1. Introduction The In-Ouzzal granulitic block is isolated between two branches |  | | Journal (article/letter/editorial) | | 1525-1314.2005.00573.x Calculated phase equilibria in K2O-FeO-MgO-Al2O3-SiO2-H2O for silica-undersaturated...Silica-undersaturated, sapphirine-bearing granulites occur in a large number of localities worldwide. Such rocks...559â578]. FMAS equilibria are signiïŹcantly displaced in PâT space from silicate melt-bearing KFMASH equilibria...univariant silica-undersaturated KFMASH equilibria result in a PâT projection that is topologically more complex...corundum) occur down to c. 900 C in KFMASH, some 100 C lower than in silica-saturated compositions, and |  | | Journal (article/letter/editorial) | | Springer-Verlag 1983 Deformation and Related Radiochronology in a Late Pan-African Mylonitic Shear Zone, Adrar des...fracturation of the crystals and dispersion of the fragments in the ductile matrix. An equilibrium grain size was...the initial size of the zircons and of the strain. In order to establish an accurate radiochronology of...zircons. In agreement to previous U - Pb, Rb - Sr and S m - Nd data, the present results show that in the...the Iforas as in the western Hoggar, a main granulite facies metamorphism occurred 2,120_+20 Ma ago. U/Pb |  | PEUCAT, J.-J., CAPDEVILA, R., DRARENI, A., CHOUKROUNE, P., FANNING, C. M., BERNARD-GRIFFITHS, J., FOURCADE, S. (1996) Major and trace element geochemistry and isotope (Sr, Nd, Pb, O) systematics of an Archaean basement involved in a 2.0 Ga very high-temperature (1000oC) metamorphic event: In Ouzzal Massif, Hoggar, Algeria. Journal of Metamorphic Geology, 14 (6) 667-692 doi:10.1111/j.1525-1314.1996.00054.x | Journal (article/letter/editorial) | | basement involved in a 2.0 Ga very high-temperature (1000 °C) metamorphic event: In Ouzzal Massif, Hoggar...Hoggar, Algeria J . - J . P E U CAT, 1 R . CA P DE V I LA , 1 A . D R AR E NI , 2 P . CH O UK R OU NE , 1*...USTHB, Institut des Sciences de la Terre, Algiers, Algeria 3 Research School of Earth Sciences, ANU, Canberra...CT The In Ouzzal granulitic massif is composed mainly of various meta-igneous rocks which, in spite of...of Rb, U, Th, Cs and some K and Sr mobility, can be dated and generally classified according to their |  | | Journal (article/letter/editorial) | | relationships in the Precambrian AI-Mg-rich granulites from In Ouzzal, Hoggar, Algeria P. BERTRAND,' K H . O...O U Z E G A N E 2 A N D J . R. K I E N A S T 3 Laboratoire de Petrologie Physique, Universite Paris-7...21nstitut des Sciences de la Terre, U.S.T.H.B., Alger, Algeria Laboratoire de Petrologie Mdtamorphique, Universite...ABSTRACT The Al-Mg-rich granulites from the In Ouzzal craton, Algeria, show a great diversity of mineral reactions...continuous equilibria as predicted by phase relationships in the Fe0-Mg0-A1,03SiO, system. The sequence of mineral |  | | Journal (article/letter/editorial) | | petrogenetic grid for aluminous granulite facies metapelites in the KFMASH system P. M C D ADE AND S . L . HA R LE...petrogenetic grid for Mg±Al rich metapelites containing K-feldspar, sillimanite and quartzofeldspathic melt that...observations of commonly associated mineral assemblages in natural lithologies the [Spr, Spl], [Qtz, Spl], [Bt...Further, more subtle differences in topology result from the treatment of H2O in the chemographic projection...Complex and Rauer Group, East Antarctica, and In Ouzzal, Algeria. Key words: metapelitic granulites; petrogenetic |  | MARIGNAC, CH., SEMIANI, A., FOURCADE, S., BOIRON, M.-C., JORON, J.-L., KIENAST, J.-R., PEUCAT, J.-J. (1996) Metallogenesis of the late Pan-African gold-bearing East Ouzzal shear zone (Hoggar, Algeria) Journal of Metamorphic Geology, 14 (6) 783-801 doi:10.1111/j.1525-1314.1996.00056.x | Journal (article/letter/editorial) | | late Pan-African gold-bearing East Ouzzal shear zone (Hoggar, Algeria) C H . M A RI G NA C , 1 A. S E MI...Marignac@mines.u-nancy.fr) 2 ORGM, Boumerdes, Algeria 3 GeÌosciences Rennes, France 4 CREGU, Nancy, France...France A B S TR A CT In the W Hoggar (Algeria), the major transcurrent NâS East Ouzzal shear zone (EOSZ)...contrasting Precambrian domains: the Archaean In Ouzzal block to the west (orthogneisses with subordinate...subordinate metasediments, reworked and granulitized in the c. 2 Ga Eburnean event) and a Middle Proterozoic |
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