Controlling factors on clay mineral assemblages: insights from facies analysis of Pliocene to Pleistocene coastal margin deposits, Western Portugal

Authors

  • P. Dinis University of Coimbra.
  • A. F. Soares University of Coimbra.

DOI:

https://doi.org/10.1344/105.000000303

Keywords:

Paleogeography, Facies, Clay minerals, Provenance

Abstract

The clay fractions in the Pliocene to Pleistocene coastal margin record are usually dominated by kaolinite and illite, with lesser amounts of vermiculite, 10-14 mixed layer clays and smectite. The high clay mineral crystallinity, the mineralogical relations to facies and depositional setting and some horizontal variations along coeval deposits suggest that clay assemblages are mainly detrital. Illite is more important in inner shelf deposits and particularly in alluvial deposits from eastern locations. The high illite content in eastern alluvial deposits is explained by the input from the neighbouring Iberian Variscan Massif that is rich in mica. The high kaolinite content in prograding sand and gravel coastal plain is partially explained by the availability of this mineral in the drainage areas. Given the arkosic nature of some of these deposits, post-depositional feldspars weathering would also contribute to an increase in kaolinite content. Vermiculite is particularly important close to the surface and to unconformities, in horizons influenced by pedogenetic processes that have more aluminous illite with relatively low crystallinity. In organic rich mud sediments low pH conditions favour post-depositional transformation of illite to vermiculite and mixed layer clays.

Author Biographies

P. Dinis, University of Coimbra.

Department of Earth Sciences, Geosciences Centre.

A. F. Soares, University of Coimbra.

Department of Earth Sciences, Geosciences Centre.

References

Ahlberg, A., Olsson, I., Simkevicius, P., 2003. Triassic-Jurassic weathering and clay mineral dispersal in basement areas and sedimentary basins of southern Sweeden. Sedimentary Geology, 161, 15-29.

Anthony, E.J., Oyédé, L.M., Lang, J., 2002. Sedimentation in a fluvially infilling, barrier-bound estuary on a wave-dominated, microtidal coast, the Ouémé River estuary, Benin, west Africa. Sedimentology, 49, 1095-1112.

Antunes, A.T., Pais, J., 1993. The Neogene of Portugal. Ciências da Terra, 12, 7-22.

Berger, A., Li, X.S., Loutre, M.F., 1999. Modelling northern hemisphere ice volume over the last 3Ma. Quaternary Science Reviews, 18, 1-11.

Bhattacharya, J.P., Giosan, L., 2003. Wave-influenced deltas: geomorphological implications for facies reconstruction. Sedimentology 50, 187-210.

Blair, T.C., McPherson, J.G., 1994. Alluvial fans and their natural distinction from rivers based on morphology, hydrolic processes, sedimentary processes and facies assemblages. Journal of Sedimentary Research, A64, 450-489.

Braga, M.A.S., Paquet, H., Begonha, A., 2002. Weathering of granites in a temperate climate (NW Portugal): granitic saprolites and arenization. Catena, 49, 41-56.

Cabral, J., 1995. Neotectónica em Portugal Continental. Memórias do Instituto Geoógico e Mineiro, 31, 1-265.

Chamley, H., 1989. Clay sedimentology. Berlin, Springer Verlag, 623 pp.

Cheel, R.J., Leckie, D.A., 1992. Coarse-grained storm beds of the upper Cretaceous Chungo Member (Wapiabi Formation), Southern Alberta, Canada. Journal of Sedimentary Petrology, 62, 933-945.

Crowley, T.J., 1996. Pliocene climates; the nature of the problem. Marine Micropaleontology, 27, 3-12.

Cunha, P.M., 1992. Estratigrafia e sedimentologia dos depósitos do Cretácico Superior e Terciário de Portugal Central, a Leste de Coimbra. Doctoral thesis. University of Coimbra, 262 pp.

Cunha, P.M., Barbosa, B.P., Reis, R.P., 1993. Synthesis of the Piacenzian onshore record, between the Aveiro and Setúbal parallels (Western Portuguese margin). Ciências da Terra, 12, 35-43.

Dalrymple, R.W., Zaitlin, B.A., Boyd, R., 1992. Estuarine facies models: conceptual basis and stratigraphic implications. Journal of Sedimentary Petrology, 62, 1130-1146.

Daveau, S., Birot, P., Ribeiro, O., 1985-86. Les bassins de Lousã et Arganil . Recherches géomorphologiques et sédimentologiques sur le massif ancien et sa coverture a l’est de Coimbra. Memórias do Centro Estudos Geográficos, 8, 1-450.

Diekmann, B., Petschick, R., Gingele, F.X., Fütterer, D.K., Abelmann, A., Gersonde, R., Mackensen, A., 1996. Clay mineral fluctuations in Late Quaternary sediments of the southeastern South Atlantic: Implications for past changes of deep-water advection. In: Wefer, G., Berger, W.H., Siedler, G., Webb, D. (eds.). The South Atlantic: Present and Past Circulation. Heidelberg, Springer, 621-644.

Dinis, P.A., 2004. Evolução pliocénica e quaternária do vale do Cértima. Doctoral thesis. University of Coimbra, 351 pp.

Diniz, F., 1984. Apports de la palynologie a la connaissance du Pliocéne Portugais. Rio Maior un bassin de referénce pour le histoire de la flore, de la vegetation et du climat de la façade atlantique de l’Europe méridionale. Doctoral thesis. University of Montpellier, 230 pp.

Elkibbi, M., Rial, J.A., 2001. An outsider´s review of the astronomical theory of climate: is the eccentricity-driven insolation the main driver of the ice ages? Earth-Science Reviews, 56, 161-177.

Esquevin, J., 1969. Influence de la composition chimique des Illites sur cristallinite. Bulletin du Centre de Recherches de Pau, 3, 147-153.

Fauquette, S., Suc, J.-P., Guiot, J., Diniz, F., Feddi, N., Zheng, Z., Bessais, E, Drivaliari, A., 1999. Climate and biomes in the West Mediterranean area during the Pliocene. Palaeogeography, Palaeoclimatology, Palaeocology, 152, 15-36.

Ferreira, A.B., 1991. Neotectonics in Northern portugal. A geomorpholigical approach. Zeitschrift fur Geomorph, v. Suppl. Bd. 82, 73-85.

Friend, P.F. 1983. Towards the field classification of alluvial architecture or sequence. Modern and Ancient Fluvial Systems. In: Collinson, J.D., Lewin, J. (eds.). Speciall Publication of International Association of Sedimentologists, 6, 345-354.

Gibson, T.G., Bybell, L.M., Mason, D.B., 2000. Stratigraphic and climatic implications of clay mineral changes around the Paleocene/Eocene boundary of the northeastern US margin. Sedimentary Geology, 134, 65-92.

Gingele, F.X., 1996. Holocene climatic optimum in Southwest Africa -evidence from the marine clay mineral record. Palaeogeography, Palaeoclimatology, Palaeocology, 122, 77-87.

Kahle, M., Kleber, M., Jahn, R., 2002. Review of XRD-based quantitative analyses of clay minerals in soils: the suitability of mineral intensity factors. Geoderma, 109, 191-205.

Keller, W.D., 1970. Environmental aspects of clay minerals. Journal of Sedimentary Petrology, 40, 788-814.

Kübler, B., Jaboyedoff, M., 2000. Illite crystallinity. Comptes Rendue de l’Académie des Sciences, 331, 75-89.

Montuire, S., 1999. Mammalian faunas as indicators of environmental and climatic changes in Spain during the Pliocene-Quaternary transition. Quaternary Research, 52, 129-137.

Net, L.I., Alonso, M.S., Limarino, C.O., 2002. Source rock and environmental control on clay mineral associations, Lower Section of Paganzo Group (Carboniferous), Northwest Argentina. Sedimentary Geology, 152, 183-199.

Nichols, G., Thompson, B., 2005. Bedrock lithology control on contemporaneous alluvial fan facies, Oligo-Miocene, Southern Pyrenees, Spain. Sedimentology, 52, 571-585.

Nishikawa, T., Ito, M., 2000. Late Pleistocene barrier-island development reconstructed from genetic classification and timing of erosional surfaces, paleo-Tokyo Bay, Japan. Sedimentary Geology, 137, 25-42.

Oliveira, A., Rocha, F., Rodrigues, A., Jouanneau, J., Dias, A., Weber, O., Gomes, C., 2002. Clay minerals from the sedimentary cover from the northwest Iberian Shelf. Progress in Oceanography, 52, 233-247.

Pais, J., 1989. Evolução do coberto florestal em Portugal no Neogénico e no Quaternário. Comunicáções dos Serviços Geológicos de Portugal, 75, 67-72.

Pe-Piper, G., Dolansky, L., Piper, D.J.W., 2005. Sedimentary environment and diagenesis of the Lower Cretaceous Chaswood Formation, southeastern Canada: The origin of kaolinrich mudstones. Sedimentary Geology, 178, 75-97.

Raymo, M.E., Ruddiman, W.F., Shackleton, N.J., Oppo, D.W., 1990. Evolution of Atlantic-Pacific δ13C gradients over the last 2,5 m.y. Earth and Planetary Science Letters, 97, 353-368.

Rocha, F.J., 1993. Argilas aplicadas a estudos litostratigráficos e paleoambientais na Bacia Sedimentar de Aveiro. Doctoral thesis. University of Aveiro, 399 pp.

Sáez, A., Inglès, M., Cabrera, L., Heras, A., 2003. Tectonic paleoenvironmental forcing of clay-mineral assemblages in nonmarine settings: the oligocene-Miocene As pontes Basin (Spain). Sedimentary Geology, 159, 305-324.

Silva, C.M. 2001. Gastrópodes pliocénicos marinhos de Portugal. Sistemática, paleobiologia, paleoecologia e paleobiogeografia. Doctoral thesis. University of Lisbon, 675 pp.

Sˇimkevicius, P., Ahlberg, A., Grigelis, A., 2003. Jurassic smec- ˇtite and kaolinite trends of the East European Platform: implications for palaeobathymetry and palaeoclimate. Terra Nova, 15, 225-229.

Singer, A., 1980. The paleoclimatic interpretation of clay minerals in soils and weathering profiles. Earth-Science Reviews, 15, 303-326.

Soares, A.F., 1999. As unidades quaternárias e pliocénicas no espaço do Baixo Mondego (uma perspectiva de ordem). Estudos do Quaternário, 2, 7-17.

Soares, A.F., Lapa, M.L., Marques, J.F., 1986. Contribuição para o conhecimento da litologia das unidades MesoCenozóicas da bacia Lusitaniana a Norte do acidente da Nazaré (sub-zona setentrional). Memórias e Notícias, Publicações do Museu Laboratório Mineralógico e Geológico da Universidade de Coimbra, 102, 23-41.

Thiry, M., 2000. Paleoclimatic interpretation of clay minerals in marine deposits: an outlook from the continental origin. Earth-Sciences Reviews, 49, 201-221.

Thiry, M., Jacquin, T., 1993. Clay mineral distribution related to rift activity, sea level changes and paleoceanography in the Cretaceous of the Atlantic Ocean. Clay Minerals, 28, 61-84.

van Dam, J.A., 2006. Geographic and temporal patterns in the late Neogene (12-3Ma) aridification of Europe: the use of small mammals as paleoprecipitation proxies. Palaeogeography, Palaeoclimatology, Palaeocology, 238, 190-218.

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Published

2007-01-12

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