 | | Journal (article/letter/editorial) | | Amsterdam - Printed in The Netherlands [21 St. John's Island (Red Sea)" a new geophysical model and its implications...New gravity and magnetic data from the northern Red Sea reveal the extent of the large gravity anomaly...presence of significant magnetic anomalies over St. John's Island. Spectral transformation and three-dimensional...4 g / c m 3) to a depth of at least 8 km. St. John's Island is uniquely located, not only at a passive...fracture, seems most probable. 1. Introduction The Red Sea provides, perhaps, the finest laboratory in the |  | | Journal (article/letter/editorial) | | Hydrothermal Alteration of Peridotite, Zabargad Island (Red Sea) by F. BOUDIER AND A. NICOLAS Laboratoire Tectonophysique...France INTRODUCTION Zabargad Island on the Egyptian margin of the Red Sea has been intensively studied...be related to the early stage of rifting of the Red Sea (Bonatti et al, 1983,1986; Nicolas et al, 1985...intrusions observed along the Arabian margin of the Red Sea (Sebai et al, 1987; Coleman & MacGuirre, 1988)...that time continuous between the two sides of the Red Sea. This interpretation fits the Zabargad data well |  | Kurat, G., Palme, H., Embey-Isztin, A., Touret, J., Ntaflos, T., Spettel, B., Brandst�tten, F., Palme, C., Dreibus, G., Prinz, M. (1993) Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt. Mineralogy and Petrology, 48 (2) 309-341 doi:10.1007/bf01163106 | Journal (article/letter/editorial) | | Peridotites and Associated Vein Rocks of Zabargad Island, Red Sea, Egypt* G. Kurat 1, H. Palme 2, A. Embey-Isztin...March 31, 1993 Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies,...ofporphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; it took place under a variety of p-T conditions...Meet, Agypten Auf der Insel Zabargad (St.John's Island) im Roten Meer befinden sich drei PeridotitK6rper...Welt sehr/ihnlich. Die am st~irksten verarmten Peridotite scheinen aueh die st/irksten metasomatischen |  | | Journal (article/letter/editorial) | | granulite gneisses of Zabargad island: implications for the early stages of the Red Sea rifting JoEl R . L a n...Previous geochronological results obtained on Zabargad island and AI Lith and Tihama-Asir complexes (Saudi Arabia)...mantle diapir during the early opening of the Red Sea rift. In contrast, Sm-Nd and Rb-Sr internal isochrons...Afro-Arabian shield. During early stages of the Red Sea rifting in the Miocene, these Precambrian granulites...peridotite diapir. 1. Introduction Z a b a r g a d island ( 2 3 ° 3 6 . 5 ' N , 3 6 ° 1 2 ' E ) is located |  | | Journal (article/letter/editorial) | | R.S.E., A.R.S.M., Director Geological Survey of Egypt; and H. F. HAEWOOD, M . S C , Ph.D., A.I.C., Lecturer...Dr. Hume on the igneous and metamorphic rocks of Egypt, and in the course of his kind criticism of the...from the region in the South-Eastern Desert of Egypt, where this type of rock is most GKOT,. MAG. 192O...Nos. 2 to 5 were obtained from the region in S.E. Egypt where these rocks are most conspicuously developed...Khrug. The majority of the gneisses occurring in Egypt may be classed either as granite-gneisses (crushed |  | Vannucci, R., Shimizu, N., Bottazzi, P., Ottolini, L., Piccardo, G. B., Rampone, E. (1991) Rare Earth and Trace Element Geochemistry of Clinopyroxenes from the Zabargad Peridotite--Pyroxenite Association. Journal of Petrology, Special_Volume (2) 255-269 doi:10.1093/petrology/special_volume.2.255 | Journal (article/letter/editorial) | | lherzolites and pyroxenites from the island of Zabargad (St. John's Island, Red Sea) were analysed for rare earth...northern sector of the Red Sea, where the island of Zabargad (St. John's Island) crops out, exposing a...a very fresh uplifted fragment of sub-Red Sea upper mantle (Bonatti et al., 1981, 1986; Nicolas et al...depleted lherzolites and local enrichments of plagioclase occur widely (Bonatti et al, 1986), and rare...rare gabbroic dykelets consisting of calcic plagioclase, cfinopyroxene, and sparse Ti-rich phlogopite are |  | | Journal (article/letter/editorial) | | refer to standard and specimen respectively. St. John's Island olivine (9.8% Fa) was counts I 1Onto ,...olivine compositions. Typical spectra from St. John's Island standard and a pallasite are shown in Fig...pallasite olivines. The 6°Ni/S4Fe ratio for the St. John's Island olivine standard was measured at the beginning...mass numbers 54 and 60 on olivine from (1) St. John's Island, and (2) the Marjalabti pallasite. The mass...Ekremseter Quarry, Norway (I.S. Sanders) 2. St. John's Island olivine 3. Allivalite, Rhum, Scotland (Camb |  | | Book | | Sheet Gem Deposits: 115 119 The Zabargad Island, Egypt, Peridot Deposits 9. Diamond Pipes: 129 The...respectively. The classic peridot of Zabargad Island, Egypt and the new find at Argyle in Western Australia...Australian opal mining. Photographs of Zabargad Island were generously provided by Dr. Peter Bancroft...of all placer deposits are found on the tropical island of Sri Lanka (formerly Ceylon), without doubt,...coast of India. It has commonly been called the "island of gems" because of the large and spectacular array | | | Book | | Sheet Gem Deposits: 115 119 The Zabargad Island, Egypt, Peridot Deposits 9. Diamond Pipes: 129 The...respectively. The classic peridot of Zabargad Island, Egypt and the new find at Argyle in Western Australia...Australian opal mining. Photographs of Zabargad Island were generously provided by Dr. Peter Bancroft...of all placer deposits are found on the tropical island of Sri Lanka (formerly Ceylon), without doubt,...coast of India. It has commonly been called the "island of gems" because of the large and spectacular array |  | | Book (volume) | | J. Boast Nuclear Materials Corporation Cairo, Egypt Department of Geology University of South Carolina...187 187 188 188 189 190 194 197 200 201 202 The Red Sea Region E.M. EI Shazly I. Introduction ..........Cover in the Red Sea Region ..................... C. Contribution of DSDP Drilling to Red Sea Stratigraphy............................. ......... III. The Red Sea .............................................................................. B. Petrology of Red Sea Rocks .. .. .. .. .. .. .. .. .. .. .. ...... |  | | Journal (article/letter/editorial) | | ferrobasalt by fractional crystallization of olivine, plagioclase and clinopyroxene. Hybrid magmas with ferrobasaltic...ferrobasalt and uplift of ultramafic rocks to above the sea-level which is suggested by detritat ultramafics...serpentinites - Evidence of a fossil transform fault On the island of Tviberg (Fig. 1) there is evidence for the existence...and a corresponding increase in the content of plagioclase. Individual patches of diorite may have both...dykes are exposed on the SE and W coast of the island. The dykes strike E-W to NE-SW and have shallow |  | Vannucci, R., Shimizu, N., Piccardo, G. B., Ottolini, L., Bottazzi, P. (1993) Distribution of trace elements during breakdown of mantle garnet: an example from Zabargad. Contributions to Mineralogy and Petrology, 113 (4) 437-449 doi:10.1007/bf00698314 | Journal (article/letter/editorial) | | HFSE anomalies. Progressive upwelling during the Red Sea rifting produced incomplete reaction under pl-facies...from granular spinel-bearing to granoblastic plagioclase-bearing assemblages, being preserved only in...deep-seated tholeiitic magmatism unrelated to the Red Sea evolution, thus representing the earliest event...In the northern sector of the Red Sea, the Island of Zabargad (St. John's) exposes very fresh mantle peridotites...Zabargad Island represents an uplifted fragment of the continental lithosphere of the northern Red Sea (Bonatti |  | | Journal (article/letter/editorial) | | bodies from preoceanic rifts (Zabargad Island in the Red Sea), passive ocean margins (Iberian and Spitsbergen...suggest that peridotites from a preoceanic rift (Red Sea) and from passive margins equilibrated in the mantle...asthenospheric upwelling beneath preoceanic, northern Red Sea-type rifts than beneath mid-ocean ridges. Subduction...correlate with variations of zero- 298 age depth below sea level of the top of the crust, and of residual geoid...mantle-derived samples from: (a) a preoceanic rift (central Red Sea); (b) passive oceanic margins in the North Atlantic |  | | Journal (issue) | | Convention plans may be obtained from Jack Streeter, 6808 St. Estaban Street, Tujunga, Calif., or from the secretary...civilian passenger car) , is possible through Tooele, St. John, Lookout Pass and Simpson Springs to the foot...conclusion supported by deep 1nas1on of the Bonneville sea cliff near the_ ~~er Bed, and comparitively shallow...that any careful of a deeply-incised Bonneville sea cliff coll~or can ~ e. an ample and ~tt· confirmed...passed the ".ast sand dunes which rise above the sea level as high as 2, 71 S ft. These dunes form )and |  | | Journal (article/letter/editorial) | | an inhomogeneous lithosphere in the case of the Red Sea and Kenya Rift and show that in these situations...example is the lherzolite massif of Zabargad Island in the Red Sea because this massif was intruded during...massifs are entirely or partly composed of plagioclase lherzolites; a detailed comparative study has...Kinematic analysis of the early rifting in the Red Sea suggests, however, that sinistral strike-slip motion...as in the Pyrenees and in the Gibraltar Arc. Plagioclase lherzolites, in which high-temperature flow operated |  | | Book | | less. The “absorption spectrum” produced except red and green light and through when white light passes...through a gem¬ the filter a true emerald appears red while stone can be viewed using an instrument imitation...colour. A ruby coloured by radiation chromium and a red almandine garnet although these may fade with time...colour, for example. Pyrope of the stone for a red ray, which is refracted garnet is moderately magnetic...which is refracted separated from non-magnetic red spinel. most. Diamond has a dispersion of 0.044 |  | | Book | | F. HUME, the Pioneers of the E astern Desert of Egypt 1\1:ultum non multa Plinius ]1-1,nior CONTENTS...OF SUEZ AND THE NORTHERN RED SEA . . . . . 7 . r. Tectonic map of Egypt by N. A. Syagaev . . . ...Southern Area of the Red Sea Hills towards the Sudan border (Photogeological map of Upper Egypt by Hunting, 1967)...1967) 4. Border area between Sudan and Egypt 5. A. Stratigraphic correction . . . . . . B. Tectonics... . . . . a) Fault Zones crossing the Northern Red Sea. b) The Cairo Graben . . . . . . c) The northern |  | | Journal (article/letter/editorial) | | knowledges on the geodynamic evolution of the Afar-Red Sea system. R6sum6 Dans ce travail nous presentons...Danakil Alps, between the Afar Depression and the Red Sea, and it has been built along an E - - W fracture...NNW tectonic trend of the Afar Depression and Red Sea rift (Fig. 1). This transversal volcanic activity...titaniferous) and An 60 plagioclase. The groundmass consists of plagioclase (andesine-labradorite), pyroxene... Fig. 1. Sketch map of the Assab and southern Red Sea area. 1 = limits of tile escarpements; 2 = axial |  | | Journal (article/letter/editorial) | | ZjA and Z without calculating individual values of St. A modified form of this equation was used by Smith...Duke University on December 13, 2012 where Q and St are the concentration and stopping power of the /-th...fS ON fN (N — (S OO Q ON Olivine Chemical* (St. John's Is.) X.R.Fj Adopted « < — VO fN Os to O r^...samples and standards. The analyses for the St. John's Island olivine, shown in detail in Table 13, have...attempt a really serious assay', while for St. John's Island olivine, there was only enough material for |  | | Journal (article/letter/editorial) | | TEM ex- house, Virginia; anorthite from Sitkin Island; and tugtuaminations of antiphase domains indicate...and White, W.B. (1978) Vibrational structure of the St luminescencein scapolite. Physics and Chemistry of...Scapolite-cancrinitemineral association in St. John's Island, Egypt. 24th International Geological Congress...Goldsmith, J.R., and Newton, R.C. (1977) Scapolite-plagioclase relations at high pressuresand temperaturesin...equilibrium. CanadianMinHaughton, D.R. (l 97 I ) Plagioclase-scapolite eralogist,10, 854-870. Hazen, R.M. |  | | Report (chapter) | | plagioelase -4- olivine, forming orthopyroxene + plagioclase-rich peridotite. Migrating liquids became progressively...progressively saturated in clinopyroxene and plagioclase, forming interstitial clinopyroxene at olivine...olivine triple points followed by clinopyroxene • plagioclase megacrysts and gabbro veinlets within the dunite...dunite, and gabbro dykelets within plagioclase peridotites. Subsequent cooling during continued exhumation...mantle rocks are embryonic ocean basins (e.g. the Red Sea) and ocean-continent transition zones (e.g. Iberia |  | | Journal (article/letter/editorial) | | a result of smaller degrees of melting, with plagioclase lherzolites as residue. For even smaller rates...in the diapir stops at about 15 km depth in plagioclase lherzolites (except for afinalmelt extraction...(Bonatti et al., 1983; Nicolas et al., 1985) in the Red Sea, and of over ten harzburgite massifs (references...melting and melt extraction processes. Spinel and plagioclase lherzolites, in which the melting stopped earlier...the most conspicuous minerals are diopside and plagioclase; and (2) to distinguish whether these melt products |  | | Journal (article/letter/editorial) | | manganese and aluminum have been measured for St. John's olivine undergoing cation exchange with synthetic...containing relatively high concentrations of Sin, St, and Pb - these crystals were essentially "xenocrysts'"...olivine (approximately 90% forsterite) from St. John's Island, Egypt was immersed in olivine-saturated, basaltic...at an JO2 of 10 -8 atm: diffusion is o u t of St. John's olivine cube; a Microprobe data (wt.%) versus...concentration, 9.3 wt.% Fe, was evaluated on a St. John's olivine blank. In addition, the surface concentration |  | | Journal (article/letter/editorial) | | are the dominant xenolith type at Kapfenstein. Plagioclase and garnet were never observed. Rare garnet-spinel...upper mantle like the peridotites of Zabargad Island, Red Sea (Bonatti et al., 1983; Kurat et al., 1983,...example, a composite rock sample from Zabargad Island consisting of weakly deformed and strongly deformed...EITahir MA (1983) Zabargad (St. John's Island): An uplifted fragment of sub-Red Sea lithosphere. J Geol Soc...replacement phenomena from the upper mantle, Nunivak Island, Alaska. Contr Mineral Petrol 58:51-61 Frey FA |  | | Journal (article/letter/editorial) | | Bracciano, Italy (Bonaccorsi 1993) and Zabargad island, Egypt (Bonaccorsi et al. 1992). The lattice parameters...Italy), using albite as standard for Si, A1, Na, plagioclase type-glass as standard for Ca, microcline for...S, Pasero M (1992) Davyne from Zabargad (St. John's) Island: peculiar chemical and structural features |
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