Abstract
Core 7710, recovered on the George Bligh/Rockall Channel, is composed of fine grained ocher-colored sediments rich in ferriferous smectite (montmorillonite, beidellite). These sediments were deposited during early Eocene in a shallow marine environment. Their mineralogic, chemical and isotopic constituents indicate subaerial weathering of lower Eocene intermediate igneous rocks (ferrodiorite, marscoiite) eroded from the still-emergent George Bligh and Rockall Banks. Lack of any post Eocene Sediments may be due to major morphologic and hydrologic changes forming sedimentation gaps.
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References
Nilsen TH, Kerr DR (1978) Paleoclimatic and paleogeographic implications of a lower tertiary laterite (latosol) on the Iceland-Faeroe ridge, North Atlantic region. Geological Magazine 115:153–236
Løvlie R, Kvingedal M (1975) A paleomagnetic discordance between a lava sequence and an associated interbasaltic horizon from the Faroe Islands. Geophysical Journal of the Royal Astronomical Society 40: 45–54
Richey JE, Mac Gregor AG, Anderson FW (1961) British Regional Geology-Scotland: The Tertiary Volcanic Districts. Geological Survey and Museum, Edinburgh, 120 p
Wilson HE, Marring PI (1978) Geology of the Causeway Coast. Geological Survey of Northern Ireland 1–2
Fan PF, Zemmels I (1972) X-ray mineralogy studies-leg 12. In: Davies TA (ed) Initial Reports of the Deep Sea Drilling Project Leg 12. U.S. Government Printing Office, Washington, D.C., pp 1127–1154
Manheim FT, Siems DE (1974) Chemical analyses of Red Sea sediments. In: Supko PR, Weser OE (eds) Initial Reports of the Deep Sea Drilling Project Leg 23. U.S. Government Printing Office, Washington, D.C., pp 923–938
Duchaufour P (1977) Pedologie. Masson, Paris
Floyd PA, Winchester JA (1975) Magma type and tectonic setting discrimination using immobile elements. Earth and Planetary Science Letters 27:211–218
Clauer N (1976) Geochimie isotopique du strontium des milieux sédimentaires. Application á la géochronologie de la couverture du craton Ouest-Africain. Sciences Geologiques Mémoires, Strasbourg 45:256 p
Clauer N, Hoffert M, Grimaud D, Millot G (1975) Composition isotopique du strontium d'eaux interstitielles extraites de sédiments récents: un argument en faveur de l'homogénéisation isotopique des minéraux argileux. Geochimica et Cosmochimica Acta, 39:1579–1582
Evans AL, Fitch FJ, Miller JA (1973) Potassium-argon age determinations on some British Tertiary Igneous rocks. Journal of the Geological Society 129:419–443
Harrison RK, Knose O'B, Morton AC (1979) Petrography and mineralogy of volcanogenic sediments from DSDP Leg 48, southwest Rockall Plateau, sites 403 and 404. In: Usher JL (ed) Initial Reports of the Deep Sea Drilling Project Leg 48. U.S. Government Printing Office, Washington, D.C., pp 771–783
Lacroix A, Minéralogie de Madagascar. Paris 2:595–596
Sabine PA (1960) The geology of Rockall. North Atlantic Bulletin Geological Survey Great Britain 16:156
Miller JA, Mohr PA (1965) Potassium-argon age determination on rocks from St Kilda and Rockall. Scottish Journal of Geology 1: 93–99
Roberts DG, Montadert L (1979) Margin paleoenvironments of the northeast Atlantic. In: Usher JL (ed) Initial Reports of the Deep Sea Drilling Project Leg 48. U.S. Government Printing Office, Washington D.C., pp 1099–1118
Hamilton J, O'Nions RK, Evensen N (1976) Precise Sr isotope determination for leg 38 basalts. In: White S (ed) Initial Reports of the Deep Sea Drilling Project Leg 38. U.S. Government Printing Office, Washington D.C., p 753
Moorbath S, Thompson RN (1980) Strontium isotope geochemistry and petrogenesis of the early lava pile of the Isle of Skye. Scotland and other basic rocks of the British tertiary province: an example of magma-crust interaction. Journal of Petrology 21:295–321
Moorbath S, Bell JD (1965) Strontium isotope abundance studies and rubidium-strontium age determination on tertiary igneous rocks from the Isle of Skye, Northwest Scotland. Journal of Petrology 6:37–66
Hamilton El (1963) The isotopic composition of strontium in the Skaergaard intrusion, East Greenland. Journal of Petrology 4:383–391
Dickin AP (1981) Isotope geochemistry of tertiary igneous rocks from the Isle of Skye, N.W. Scotland. Journal of Petrology 22:155–189
Becksindale RD (1974) Rb-Sr and K-Ar age determinations, and oxygen isotope data for the Glen cannel granophyre, Isle of Mull, Ar gyllshire, Scotland. Earth and Planetary Science Letters 22:267–274
Moorbath S, Welke H (1968) Isotopic evidence for the continental affinity of the Rockall Bank. North Atlantic Earth and Planetary Science Letters 5:211–216
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Ferragne, A., Latouche, C. & Parra, M. Lower Eocene red-clay sedimentation on the George Bligh/Rockall Channel. Geo-Marine Letters 4, 77–82 (1984). https://doi.org/10.1007/BF02277076
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DOI: https://doi.org/10.1007/BF02277076