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A Deep-Water Glauconitization Process on the Ivory Coast—Ghana Marginal Ridge (ODP Site 959): Determination of Fe3+-Rich Montmorillonite in Green Grains

Published online by Cambridge University Press:  28 February 2024

A. Wiewióra ,
P. Giresse ,
S. Petit  and
A. Wilamowski
A. Wiewióra*
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818, Warszawa, Poland
P. Giresse
Affiliation:
Laboratoire de Sédimentologie Marine, Université de Perpignan, Avenue de Villeneuve, 66860, Perpignan Cedex, France
S. Petit
Affiliation:
UMR 6532 CNRS HydrASA, Université de Poitiers, 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France
A. Wilamowski
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818, Warszawa, Poland
*
E-mail of corresponding author: [email protected]
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Abstract

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The mineral and chemical composition of green glauconitic grains from ODP Site 959 (2100 m water depth) located on the northern flank of the Ivory Coast—Ghana Marginal Ridge was studied. Recurrent winnowing of a 20 m thick Pleistocene succession resulted in a low accumulation rate and stratigraphic hiatuses. The green clay material typically occurs as fillings in the chambers of pelagic foraminifers. The amount of green clay present in sediments older than 1 Ma is small, and greater in younger material. Mud composed of smectite, kaolinite, traces of mica, calcite and quartz was the precursor material that filled the chambers of the foraminifers. Processes at the water-sediment interface slowly modified this composition. Kaolinite was dissolved; smectite lost Al but gained Fe, K and layer charge. In that matrix, the nanocrystals of neoformed smectite are observed. The infrared (IR) spectra showed OH-stretching and bending vibrations due to groups incorporating Fe3+. The spectra are in agreement with the crystallochemical formulae of Fe3+-rich montmorillonite as determined by point-by-point analyses on the neoformed crystallites and on the surrounding matrix. The layer charge in this Fe3+-rich montmorillonite is almost wholly octahedral as shown in crystallochemical formulae and documented independently by a new IR method. The tetrahedral charge appeared when the Fe content increased by > 1.2 Fe per formula unit. With the maturation process, the increased role of the closed layers is observed, with the color of grains becoming greener. We have documented for the first time glauconitization proceeding at a depth of 2100 m at a temperature near 3°C. The most important factors of the process are: accumulation of terrigenous clayey material in the foraminiferal chambers, Fe supply from a nearby continent, and a lengthy residence at the water-sediment interface in the zone of the winnowing and low sediment accumulation rate.

Keywords

Eastern AtlanticFe3+-rich MontmorilloniteForaminifer FillingsGlauconitizationGreen ClayPleistocene
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 6 , December 2001 , pp. 540 - 558
Copyright
Copyright © 2001, The Clay Minerals Society

References

Amouric, M. and Decarreau, A., 1990 La transformation gel-smectite-glauconite Matèriaux Argileux; Structure, Propriétés et Applications Paris Société Française de Minèralogie et de Cristallographie 450–461.Google Scholar
Amouric, M. and Parron, C. (1992) About the glauconitization process. An HRTEM and microchemical study. Proceedings Mediterranean Clay Meeting, Lipari, pp. 11–12.Google Scholar
Biscaye, P.E., 1965 Mineralogy and sedimentation of recent deep-sea clays in the Atlantic Ocean and adjacent seas and oceans Geological Society of America Bulletin 76 803–832 10.1130/0016-7606(1965)76[803:MASORD]2.0.CO;2.CrossRefGoogle Scholar
Bonifay, D. and Giresse, P., 1992 Middle to late Quaternary sediment flux and post depositional processes between the continental slope off Gabon and the Mid-Guinean Ridge Marine Geology 106 107–129 10.1016/0025-3227(92)90057-O.CrossRefGoogle Scholar
Bowles, F.A., 1975 Paleoclimatic significance of quartz/illite variations in cores from the Eastern Equatorial North-Atlantic Quaternary Research 5 225–235 10.1016/0033-5894(75)90025-3.CrossRefGoogle Scholar
Drits, V.A. and Kossovskaya, A.G., 1980 Geocrystallochemistry of the rock-forming dioctahedral smectites (in Russian) Litologiya i Poleznye Iskopaemye 1 84–114.Google Scholar
Drits, V.A. Dainyak, L.G. Muller, F. Besson, G. and Manceau, A., 1997 Isomorphous cation distribution in celadonites, glauconites and Fe-illites determined by infrared, Mössbauer and EXAFS spectroscopies Clay Minerals 32 153–179 10.1180/claymin.1997.032.2.01.CrossRefGoogle Scholar
Farmer, V.C. and Farmer, V.C., 1974 Layer silicates Infrared Spectra of Minerals London Mineralogical Society 331–363 10.1180/mono-4.15.CrossRefGoogle Scholar
Giresse, P., 1985 Le fer et les glaucomes au large du fleuve Congo Sciences Géologiques, Bulletin 38 293–322 10.3406/sgeol.1985.1711 Strasbourg.CrossRefGoogle Scholar
Giresse, P. and Wiewióra, A., 1999 Origin and diagenesis of blue-green clays and volcanic glass in the Pleistocene of the Côte d’Ivoire-Ghana Marginal Ridge (ODP Leg 159, Site 959) Sedimentary Geology 127 247–269 10.1016/S0037-0738(99)00051-2.CrossRefGoogle Scholar
Giresse, P. Wiewióra, A. and Lacka, B., 1988 Mineral phases and processes within green peloids from two recent deposits near the Congo River mouth Clay Minerals 23 447–458 10.1180/claymin.1988.023.4.11.CrossRefGoogle Scholar
Giresse, P. Gadel, F. Serve, L. and Barusseau, J.P., 1998 Indicators of climate and sediment-source variations at site 959: implications for the reconstructions of paleoenvironments in the Gulf of Guinea through Pleistocene times Proceedings of the Ocean Drilling Program, Scientific Results 159 585–603.Google Scholar
Goodman, B.A. Russell, J.D. Fraser, A.D. and Woodhams, F.W.D., 1976 A Mössbauer and IR spectroscopic study of the structure of nontronite Clays and Clay Minerals 24 53–59 10.1346/CCMN.1976.0240201.CrossRefGoogle Scholar
Griffin, J.J. Windom, H. and Goldberg, E.D., 1968 The distribution of clay minerals in the World Ocean Deep-Sea Research, Part A 15 433–459.Google Scholar
Hillier, S. and Velde, B., 1995 Erosion, sedimentation and sedimentary origin of clays Origin and Mineralogy of Clays, Clays and the Environment Berlin Springer 162–219 10.1007/978-3-662-12648-6_4.CrossRefGoogle Scholar
Hofmann, U. and Kiemen, E., 1950 Loss of exchangeability of lithium ions in bentonite on heating Zeitschift für Anorganische und Allgemeire Chemie 262 95–99 10.1002/zaac.19502620114.CrossRefGoogle Scholar
Kelly, J.C. and Webb, J.A., 1999 The genesis of glaucony in the Oligo-Miocene Torquay Group, southeastern Australia: petrographic and geochemical evidence Sedimentary Geology 125 99–114 10.1016/S0037-0738(98)00149-3.CrossRefGoogle Scholar
Lewis, D.W., 1964 Perigenic, a new term Journal of Sedimentary Petrology 34 875 10.1306/74D711BD-2B21-11D7-8648000102C1865D.CrossRefGoogle Scholar
Madejová, J. Komadel, P. and Čičel, B., 1994 Infrared study of octahedral site populations in smectites Clay Minerals 29 319–326 10.1180/claymin.1994.029.3.03.CrossRefGoogle Scholar
Madejová, J. Bujdak, J. Petit, S. and Komadel, P., 2000 Effect of chemical composition and temperature of heating on the infrared spectra of Li-saturated dioctahedral smectites. (I): Mid-infrared region Clay Minerals 35 739–751 10.1180/000985500547160.CrossRefGoogle Scholar
Moore, D.M. and Reynolds, R.C. Jr., 1989 X-Ray Diffraction and Analysis of Clay Minerals Oxford, New York Oxford University Press 332 pp.Google Scholar
Odin, G.S. Fullagar, P.D. and Odin, G.S., 1988 Geological significance of the glaucony facies Green Marine Clays Amsterdam Elsevier 295–332 Developments in Sedimentology, 45 .CrossRefGoogle Scholar
Odin, G.S. and Matter, A., 1981 De glauconarium origine Sedimentology 28 611–641 10.1111/j.1365-3091.1981.tb01925.x.CrossRefGoogle Scholar
Odin, G.S. Stephan, J.F. et al. , Watkins, J.S. Moore, J.C. 1981 et al. , The occurrence of deep water glaucony from the eastern Pacific: the result of in situ genesis or subsidence? Initial Report Deep Sea Drilling Program Washington, D.C. U.S. Government Printing Office 419–428 66.Google Scholar
Petit, S. Righi, D. Madejová, J. and Decarreau, A., 1998 Layer charge estimation of smectites using infrared spectroscopy Clay Minerals 33 579–591 10.1180/claymin.1998.033.4.05.CrossRefGoogle Scholar
Porrenga, D.H., 1967 Clay mineralogy and geochemistry of Recent marine sediments in tropical area Stolk-Dordt University of Amsterdam 145 pp.Google Scholar
Suits, N.S. and Arthur, M.A., 2000 Sulfur diagenesis and partitioning in Holocene Peru shelf and upper slope sediments Chemical Geology 163 1–4 219–234 10.1016/S0009-2541(99)00114-X.CrossRefGoogle Scholar
Stubican, V. and Roy, R., 1961 A new approach to assignment of infra-red absorption bands in layer-structure silicates Zeitschrift fur Kristallographie 115 200–214 10.1524/zkri.1961.115.3-4.200.CrossRefGoogle Scholar
Velde, B., 1985 Clay minerals. A Physicochemical Explanation of their Occurrence Amsterdam Elsevier Developments in Sedimentology, 40 .Google Scholar
Wagner, T., 1998 Pliocene-Pleistocene deposition of carbonate and organic carbon at Site 959: paleoenvironmental implications for the eastern equatorial Atlantic off the Ivory Coast-Ghana Proceedings of the Ocean Drilling Program 159 557–574.Google Scholar
Wiewióra, A., Lacka, B. and Szczyrba, J. (1979) Celadonite, glauconite and skolite: nomenclature and identification problems. 8th Conference on Clay Mineralogy and Petrology, Teplice, Geologica, Karlova University, 47–58.Google Scholar
Wiewióra, A. Lacka, B. and Giresse, P., 1996 Characterization and origin of 1:1 phyllosilicates within peloids of the Recent, Holocene, and Miocene deposits of the Congo Basin Clays and Clay Minerals 44 597–598 10.1346/CCMN.1996.0440502.CrossRefGoogle Scholar
Wiewióra, A. Giresse, P. Jaunet, A.M. Wilamowski, A. and Elsass, F., 1999 Crystal chemistry of layer silicates of the Miocene green grain (Congo Basin) from Transmission Electron Microscopy (TEM) and Analytical Electron Microscopy (AEM) observations Clays and Clay Minerals 47 582–590 10.1346/CCMN.1999.0470505.CrossRefGoogle Scholar

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