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spreadingvulcanismmblock faultingIIupliftIFigure 14. Hypothesized sequence of events startingwith uplift and block faulting,ranging over igneous and hydrother--mal activity, lithospheric thinning,leading finally to seafloor spreading.338
SEDIMENTARY STRUCTURE OF THE NORTHERN RED SEAPREPARATION OF Al: 1,000,000 BATHYMETRIC CHARTOFTHE/UORTHERNREDSEAANDSTUDYOFTHEMORPHOSTRUCTURAL FRAMEWORK BY CARTOGRAPHICANALYSISA. FERRAGNE, R. GRIBOULARD, R. PRUD'HOMME,J-M. RATEL AND M. VIGNEAUXInstitut de Geologie du Bassin dAquitaineUniversite de Bordeaux I35 1, Cours de la Liberation33405 Talence Cedex, FranceABSTRACTContinuous analysis of the northern Red Sea domain has been made for the marine and thecontinental areas. Al: 1,000,000-scale bathymetric chart has been drawn on the basis of relevantGEBCO plotting sheets, correlated with marine charts from the Service Hydrographique de laMarine. The morphology is described in the structural framework of this domain, with a threedimensionalvisualization of the seafloor relief. The orientation and deep variations of the axialvalley are shown, with the presence of submarine deeps. The main characteristics of the marginalshelf are indicated both in the morphology and the lithological and sedimentary structure. Theevident dissimilarities between the Gulfs of Suez and Aqaba, because of their genetic differences,are perfectly illustrated. Cartographic analysis, by a filter effect, allows the elaboration of asynthetic morphostructural sketch. The essential part of the ante-opening regional geologicalstructure (structure at 3WN, Zabargad transitional zone, at 20'N A1 Nadj fault zone) is revealed;this part controls the evolution of the marine domain. The role of rifting structures, such astransform faults, is confmed. The Aqaba Gulf Fault appears clearly as a sinistral zone. The maindeeps bordering the median axis of the rift are observed to cross transversal structures. Throughthe investigation of depth variability by morphostructural analysis, a domain with differentmorphostructural characteristics can be defined, particularly with regard to regional geologicalevolution.339
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Intergovernmental Oceanographic Com
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of the IOC Marine Pollution Monitor
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PageMARGINAL SEASSTORM SURGES IN TH
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Marine PollutionAt present, marine
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THE INDIAN OCEAN --- AN ENVIRONMENT
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The subtropical anticyclonic gyre i
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GEOLOGICALBecause of its asymmetric
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RADIOACTIVE AND THERMAL WASTESIn co
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RESEARCH AND MONITORING ACTIVITIESM
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2-5, Mn 3-7, Zn 8-31, Fe 35-94, Pb
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Localized problems, both short-term
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HOLEMAN, J.N. (1968). The sediment
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UNEP/UNIDO (1982a). Industrial sour
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0-5-24 -I I I I I I I I I 11--25- A
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I*in '0( U N '0- '0 '0 N , p d'0I I
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C'EO IIFigure 6. Observations of oi
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Table 2.Ranges of Dissolved heavy m
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d.2 W2n2 n z0U.IzIO N m mENmIYEE*Ed
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Table 6. Population and related dat
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PROBLEMS IN THE PHYSICAL OCEANOGRAP
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B2: How does the Agulhas Current in
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0Q0mbWbvx(U49
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Figure 6 Average wind stress curl f
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THE DESTRUCTION OF THE TETHYS AND P
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part of the Seychelles-Mascarene bl
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Much of the old Tethys seafloor has
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when there was little or no movemen
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scouring of the sediments by cold b
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CANDE, S.C. and MUTTER, J.C. (1982)
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SHACKLETON, N.J. and KENNETT, J.P.
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0EYNz 10c2XaYWeKB20LuUz a5 cl300 10
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CALCAREOUS FORAMINIFERANANNOFOSSIL
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GEOLOGICAL-GEOPHYSICAL MAPPING OF T
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The latest tectonic generalization
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LE PICHON, X. and HEIRTZLER, J.R. (
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AN EXAMINATION OF THE FACTORS THAT
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is the specific volume anomaly. Po
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circulation. At Nagappattinam, Madr
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Table 1.MarmagaoCochin1969-781958-7
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tFigure 2. An idealized coastal cur
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STATION : BOMBAY~ J , F I M .- , A
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STATION : COCHIN, J , F , M , A , M
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3007STATION : MADRASI J I F , M I A
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STATION : CALCUTTA, J l F , M , A ,
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RED TIDE§ IN THE INDO-WEST PACIFIC
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were observed as early as 1770 duri
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diarrhetic shellfish poisoning (DSP
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GACUTAN, R.Q., TABBU, M.Y., AUJERO,
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Table 1.Clinical symptoms of variou
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Table 3. Fish species implicated in
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FIGURE CAPTIONSFigure la. Trichodes
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(*14aEE15aHH15c120
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MINERAL RESOURCES OF THE INDIAN OCE
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tonnes of monazite. Similar deposit
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Madagascar and the Red Sea. Within
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South Australian Basin: (Figs. 10-1
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Offshore placers are likely to occu
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MILLIMAN, J.D. (1974). Marine Carbo
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Thailand Tin 5560 (1980) NA 4.2 (19
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Table 2. The range (in percent) of
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Table 4. Chemical composition of po
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141FIGURE - 1
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~IT 73qw p' le' IS IFigure 4. Map s
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@A5 3 9 93 3 s 3 m4P 8O C ' . .' ,
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Figure 10. Map showng the abundance
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Figure 14. Map showing the distribu
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IFigure 17. Marine mineral explorat
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central are corals to the integrity
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Very little information is availabl
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leaving little trace of their exist
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REFERENCESAGASSIZ, A. (1903). The c
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PILLAI, C.S.G. (1969b). Studies on
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Table 1.Extent of damage to coral r
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STATUS OF CRITICAL MARINE HABITATS
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OCCURRENCEThe distribution of reefs
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Mining of Reef RockMining of reef r
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-resource. Their significance deriv
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Coating of Aerial Roots by Fine Sed
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associated with the roots (e.g. GOE
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Temperature and SalinityThe effects
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significant numbers in the Red Sea,
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mersas are known to serve as nurser
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BURCHARD, J.E. (1979). Coral fauna
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HIRTH, H.F., KLIKOFF, L.G. and HARP
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MacNAE, W. (1974). Mangrove forests
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RINKEVITCH, B. and LOYA, Y. (1977).
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WALKER, D.I. and ORMOND, R.F.G. (19
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DAMMING AND DIVERSION OF RIVERSIn d
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FUTURE STUDIESWhat can marine scien
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!0OD9 -8 Nc80,a,u-3(dcab(Dbrr)8brr)
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0 0-0 00 O0O 0% LD d- m cu 0 0202
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STORM SURGES IN THE BAY OF BENGAL*T
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low pressure centres over the Bay i
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ACKNOWLEDGEMENTSThe writers wish to
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Table 1.Latitude and longitude of p
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214
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0Poa9nU0m0Yan-I2li7mYUVQk?401mc0mYm
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0In218
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221
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Table 3. Nomenclature used by India
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ANDHRAB A Y OFB E N G A L ,.16'LO 4
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INDIABAY OF-Point CalirnereLanka L-
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pressure in the South Pacific and l
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SWALLOW, J.C. (1983). Arabian Sea c
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234
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236
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scale wind phenomenon that occurs w
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Several two-dimensional models of t
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HARTMANN, M., LANGE, H., SEIBOLD, E
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Y-Model Domaint=6hrs.b-250 0 59 Xw-
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UELEVATIONS (m) ai 18 HOURS L2:-+EL
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HARMONIC CONSTITUENT K,Figure 8. Ob
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Age of Semi-Diurnal Tide (hrs)28".+
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! 5"BOTTOMFigure 13. Predicted mode
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OCEANOGRAPHIC CONDITIONS PELAGIC PR
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Low oxygen content in subsurface wa
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R/V Dr. F. Nansen trawl of 41 m hea
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thermocline temperature decreases s
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Nitrate - NitrogenSimilarly to phos
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The maximum standing stocks in the
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By April/May the demersal stocks ha
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in 6 months when spawning occurs. T
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REFERENCES3BANSE, K. (1968). Hydrog
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GILSON, H.C., (1937). The nitrogen
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ROYAL SOCIETY (1963). International
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APPENDIX:REGIONAL COOPERATIVE INVES
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20 015 20 25FEBOC015 20 25 30 35M A
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W0-8w0-Inww[r3a+eW281
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B35 36 a7 XlO+ 35 36 a7- Mar--- Fob
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a, A
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Page 290 and 291: clearly is too low. Because of low
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Page 294 and 295: 50010001 scoOxygen (rnl/l)0I1I2I3I4
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Page 298 and 299: THE RED SEAPHYSIOGRAPHYThe Red Sea
Page 300 and 301: intensity of magnetization which co
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Page 312 and 313: LEWIS, B.T.R. (1983). The process o
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Page 316 and 317: mC- 1000- 2000- 3000E0Figure 2.Sche
Page 318 and 319: -20b-0,20wFigure 4. Seismicity and
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Page 330 and 331: SUPERFICIAL SEDIMENTS OF NORTHERN R
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Page 334 and 335: EL-SAYED (1983) used the trace meta
Page 336 and 337: BEHAIRY, AKA. (1983). Marine transg
Page 338 and 339: SHUKRI, N.M. (1953). Bottom deposit
Page 340 and 341: Table 2 Heavy metal concentrations
Page 342 and 343: EGYPTEl-Morgan 1Bargan IBargan 2Yub
Page 344 and 345: Figure 4. Distribution of minerals
Page 346 and 347: ARAGONITEHIGH HG-CALCITEFigure 6. T
Page 348 and 349: MARINE LIVING RESOURCES OF THE RED
Page 350 and 351: This elevated productivity may resu
Page 352 and 353: REVELLE (1981) mentioned that the p
Page 354 and 355: FISHELSON, L. (1964). Observation o
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