 | | 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...unserpentinised peridotite (density 3.4
g / c m 3) to a depth of at least 8 km.
St. John's Island is uniquely...fracture, seems most probable.
1. Introduction
The Red Sea provides, perhaps, the finest
laboratory in the |  | | Journal (article/letter/editorial) | | High-Temperature Hydrothermal Alteration of
Peridotite, Zabargad Island (Red Sea)
by F. BOUDIER AND A. NICOLAS
Laboratoire...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., Brandstätter, 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,...igneous process. The fluids were derived from peridotite reservoirs
(fertile and depleted) and apparently...processes may have also been active in
other peridotite bodies of the world, as was earlier recognized...Zusammenfassung
Petrologie und Geochemie der Peridotite und der mit diesen vergesellschafteten Ganggesteine |  | | 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...dragged upwards by a rising peridotite diapir.
1. Introduction
Z a b a r g a d island ( 2 3 ° 3 6 . 5 ' N |  | | 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 |  | | Journal (issue) | | Titelbild
Blick auf die Nordflanke des „main peridotite hill" mit unzählige n Abraumhalden im Serpentinit...Zusammenfassung
,,
Die kleine Insel Zabargad (St. John's Island) im Roten Meer ist ein herausgehobenes
StĂĽck...auf
englischen Karten findet sie sich als „St. John's Island". Wechselhaft wie die Namen ist
auch die Geschichte...Amphibolitgängen, dahinter Metasedimente und der „main peridotite hill", die höchste Erhebung.
einmal die Firma...Phosphate Company, Cairo, und dem Geological Survey of
Egypt, Cairo, konnten wir im Jahre 1980 eine Expedition |  | 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) | | Geochemistry of
Clinopyroxenes from the Zabargad
Peridotite-Pyroxenite Association
—Centro di Studio per...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...(Piccardo et al, 1988), related to the opening of the Red Sea (Bonatti et al,
1983, 1986; Nicolas et al, 1985) |  | | Journal (article/letter/editorial) | | olite from the Greek words meaning ?.n island in the Red Sea. And during
this time certain stones were...present, the more Iron the dark- session of. The Red Sea locality, which
er the stone. When the Iron is...ancient gemologists went by to
from St. John's Island in the Red Sea determine the identity of a stone...Peridot are the Red
The usual form for cutting Peridot Sea locality (St. John's Island), Ceylon,
is the...scattered over
the sand and in the sandy stream beds.
Peridotite is a type of igneous rock
found in great abundance |  | | Journal (article/letter/editorial) | | ULTRAMAFIC
ROCKS
FROM THE CENTRAL
EASTERN
DESERT, EGYPT
M. HAMED HATHOUT
Geological Department, Faculty...Education, Menoufia University, Shebin El-Kom
(Egypt)
(Received January 8, 1982; revised and accepted...ultramafic rocks from the central Eastern Desert, Egypt. Chem. Geol., 39: 65--80.
Nine rare-earth elements...in the Qena
Quseir area, central Eastern Desert, Egypt.
On the basis of field relations, bulk-rock composition...r t l y a l t e r e d r o c k s (St. J o h n ' s Island, R e d Sea). S t r u c t u r a l l y ,
t h e |  | | Journal (issue) | | Streeter, 6808
non-commercial display space, and a large St. Estaban Street, Tujunga, Calif., or
area has been...Accessible white marl beds containing through Tooele, St. John, Lookout Pass
plentiful fossil gastropods of...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) | | 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 |  | 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) | | forming the A1 - Di pyroxenites from the Zabargad peridotite body indicate that porphyroclastic pyroxenes...HFSE anomalies. Progressive
upwelling during the Red Sea rifting produced incomplete reaction under pl-facies...deep-seated tholeiitic magmatism unrelated to the Red Sea evolution, thus representing the
earliest event...clear-cut.
In our investigation on the Zabargad peridotite massif, we have found porphyroclastic orthopyroxenes...In the northern sector of the Red Sea, the Island of Zabargad
(St. John's) exposes very fresh mantle peridotites |  | | Journal (article/letter/editorial) | | parameters for peridotite bodies from preoceanic rifts (Zabargad Island in
the Red Sea), passive ocean...margins to a mature ocean to subduction zones, peridotite bulk and
opx AI203 content and modal clinopyroxene...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...margins. In
other words, we attempt to detect if peridotite
chemistry reflects an inferred chemical evolution |  | | Journal (article/letter/editorial) | | 00100-X
Water-rock interaction on Zabargad Island, Red S e a - - A case study:
I. Application of the...3, 1995)
Abstract--Zahargad Island is an uplifted fragment of Red Sea lithosphere. The main litbo~nheric...the island is constituted by exceptionally fresh peridotite. Fractured portions of the peridotite bodies...halite).
INTRODUCTION
the floor of the Red Sea, north of the island). Motion of the
faults occurred at shallow...(Marshak et al., 1992).
Major faults within the peridotite rigid bodies were loci of
convective transport |  | | Journal (article/letter/editorial) | | this and present evidence obtained in mantle
peridotite massifs emplaced in relation to rifting
together...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...described after a summary
of the method used in peridotite analysis. Finally,
we shall address the problem...Kinematic analysis of
the early rifting in the Red Sea suggests, however, that sinistral strike-slip motion |  | | Journal (article/letter/editorial) | | wollastonite (Ca), topaz (A1), analysed olivine from St. John's Island (Mg and Fe), and pure Ti metal. The average...analyses of olivine nodules from basalts, garnet-peridotite nodules from kimberlites, and samples of tectonically...the Eifel, Germany (Frechen, I963), and fifteen peridotite xenoliths from the Bultfontein kimberlite pipe...made available by Dr. J. B. Dawson, University of St. Andrews, to whom we are most grateful. Each sample |  | | Journal (article/letter/editorial) | | (equigranular) and undeformed (protogranular) peridotite xenoliths occur in
the internal part (Balaton...four localities yield large numbers of fresh
peridotite xenoliths (Bondor6hegy, Szentb6k~illa, Szigliget...G6rce (Embey-Isztin et al.,
1990).
Compared to peridotite xenoliths from other TVR localities, the textures...It has been widely recognized that textures of peridotite xenoliths in alkali
basalts, lamprophyres, and...textures have also been identified in some of the peridotite xenoliths from the
Balaton area and G6rce (TVR |  | | Journal (article/letter/editorial) | | wurden mit der RNAA-Methode erhalten. Die Spinell-Peridotite
zeigen eine Anreieherung an leichten Seltenen...equilibrium
crystallization at 1050~
~ C, in the spinel-peridotite stability field.
REE data on whole rock and on...that this is a characteristic
feature of spinel-peridotite xenoliths which cannot be solely imputed to host...knowledges on the geodynamic evolution
of the Afar-Red Sea system.
R6sum6
Dans ce travail nous presentons...de 1050~
~ C dans le champ de stabilit6 de la peridotite h spindle.
Les donn6es sur les terres rares dans |  | | 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 (issue) | | B111/er.................... 349
SOUFRIERE VOLCANO ON ST. VINCENT...........................................in the above caption, required by the Act of
Augu st 24, 1912, as amended by the Act of March 3, 1933...down by streams to the sea, where they
were eventually deposited in layers on
the sea-bottom. This same process...became fil1ed,
and Appalachia was worn down-almost
to sea level. Eventually the shift of
weight on the earth's...were at one time washed
from Appalachia into the sea, and later
elevated into their present position. |  | | Journal (issue) | | Miller
Famous Mineral Localities—Saint John’s Island,
E gypt..........................................Harker, 42 Oxford St., Leicester LE1 5XW
South Africa: Horst Windisch, 30 van Wouw St., Groenkioof, Pretoria...MINERALS
Telephone 624-2 132
111 W. W A S H IN G T O N ST.,
TUCSO N, A R IZ O N A
85701
F. CURETON II
& SONS...by F M members. Ed.
CALVIN MITCHELL FARM
DeKalb, St. Lawrence Co., New York
by George Robinson
This famous...467-0212
Pink a p o p h y llite , St. Andreasberg, Harz; Raspberry red rhodoch ro site , “Wolf” mine, Herdorf |  | | Book | | which are mainly black on the surface,
but pink to red at a depth; the same is true of rhodonite and rhodochrosite...usually colorless, but they can be yellow, green, red, brown or opaque, in which case they are
of industrial...some colored, transparent varieties: of these the red ones are rubies, and the blue, sapphires. Other colors...this remarkable
feature.
The color is variable: red spine! - the kind most commonly used in jewelry -...crystals were obtained from St John's Island, or Zebirget, in the
Red Sea. Olivine has been found in archeological |  | | Report (article/chapter) | | olivine, forming orthopyroxene +
plagioclase-rich peridotite. Migrating liquids became progressively saturated...gabbros. Migrating liquids, which infiltrated peridotite and
formed gabbroic rocks, span a wide range...mantle rocks are embryonic ocean basins
(e.g. the Red Sea) and ocean-continent transition
zones (e.g. Iberia...Cannat 1993, 1996). There, direct outcrop of
peridotite on the ocean floor via denudation of the
mantle...Models of continental break-up (rifting) followed by sea-floor spreading (drifting) conventionally separate |  | | Journal (article/letter/editorial) | | largely based onfieldobservations in various peridotite massifs and on basalt xenoliths,
traces the successive...does, from an interconnected melt network in the peridotite matrix (shape and volume of
melt segregation...(Bonatti et al., 1983; Nicolas et al., 1985) in the Red Sea, and of
over ten harzburgite massifs (references...remarkably
constant at the Earth's surface, the rising peridotite is thought to be on average a fertile
lherzolite...integrate the results from studies on these various peridotite
occurrences to investigate partial melting and |
|