Jökull


Jökull - 01.12.1978, Page 53

Jökull - 01.12.1978, Page 53
Thanks are also due to Dr. Axel Björnsson of the National Energy Authority for permission to use the results of the Boomer survey. Dr. A. H. Stride and his colleagues at the Institute of Oceanographic Sciences, England are thanked for invaluable discussions and suggestions during the author’s stay at the IOS in November 1976. Prof. Unnsteinn Stefánsson read the manuscript and provided useful advice. Messrs. Ölafur V. Einarsson and Hallur Thor- steinsson assisted with laboratory work, drafting and photographic work. REFERENCES Belderson, R. H., N. H. Kenyon & A. H. Stride, 1971: Holocene sediments on the con- tinental shelf west of the British Isles. In: The geology of the east Atlantic continen- tal margin. 2. Europe (Ed. by F. M. Delany). Rep. Inst. geol. Sci. 70/14, 170 pp. Belderson, R. H., N. H. Kenyon, A. H. Stride & A. R. Stubbs, 1972: Sonographs of the Sea Floor. 185 pp. Elsevier Publ. Co., Amster- dam. Channon, R. D. & D. Hamilton, 1976: Wave and tidal current sorting of shelf sediments southwest of England. Sedimentology, 23, 17-42. Draper, L., 1967: Wave activity at the sea bed around northwestern Europe. Mar. Geol., 5, 133-140. Ewing, J. A., 1973: Wave-induced bottom currents on the outer shelf. Mar. Geol., 15, M31—M35. Flemming, B. W., 1976: Side-scan sonar: A practical guide. Int. Hydrogr. Rev., 53, 6 5—92. Flemming, N. C. & A. H. Stride, 1967: Basal sand and gravel patches with separate indi- cations of tidal current and storm-wave paths, near Plymouth. J. mar. biol. Ass.U. K., 47, 433—444. Hadley, M. L., 1964: Wave-induced bottom currents in the Celtic Sea. Mar. Geol., 2, 164-167. Jónsson, J., 1965: Bergsprungur og misgengi í nágrenni Reykjavíkur (Tectonic fissures and faults in the vicinity of Reykjavík). Náttúrufraedingurinn, 35, 75 — 95. Kenyon, N. H., 1970: The origin of some trans- verse sand patches in the Celtic Sea. Geol. Mag., 107, 389-394. Kjartansson, G., 1960: Geological map of Ice- land, Sheet 3, South-West Iceland. Menn- ingarsjóður, Reykjavík. Malmberg, S. A., 1968: Beinar straummælingar á hafi úti. Straummælingar í Faxaflóa 12.—13. 8. 1966 (Direct current measurements in the sea. Measurements in Faxaflói August 1966). Náttúrufraeding- urinn, 37, 64—75. Vestdal, J. E., 1949: Hráefni til sementsfram- leiðslu og hagnýting þeirra (Raw materials for Portland cement production and their utilization). Tímarit V.F.Í.., 5, 57 — 76. Vigfússon, G.,J. Elíasson & Th. Karlsson, 1974: Öldusveigja í Faxaflóa (Wave refraction in Faxaflói). National Energy Authority Rep. OSSFS 7406, 23 pp. ÁGRIP BOTNGERÐ 1SUNNAN- VERÐUM FAXAFLÓA Sumarið 1975 voru gerðar fjölþættar mæl- ingar í sunnanverðum Faxaflóa og voru þær notaðar ásamt 260 botnsýnum til þess að draga upp mynd af gerð hafsbotns á svæðinu, svo og til túlkunar á jarðsögu svæðisins. Auk þess hafa gögnin verið notuð til þess að greina flutningsstefnu nútímasets á svæðinu. Gagnasöfnunin fór fram á sjómælinga- bátnum Tý og var unnin í samvinnu Sjómæl- inga íslands, Hafrannsóknastofnunarinnar og Orkustofnunar. Var svæðið fyrst kannað með dýptarmæli og botnsjá, þá tekin sýni af botn- inum og loks gerðar setþykktarmælingar. I stuttu máli eru niðurstöður þær að Syðra- og Vestra-Hraun og stór fláki á milli þeirra eru gerð úr samlímdum framburði, sandsteini og völubergi. Umhverfis þennan harða botn liggur breiður kragi af möl og síðan annar af JÖKULL 28. ÁR 51
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