Redox conditions in the Late Cretaceous Chalk Sea: the possible use of cerium anomalies as palaeoredox indicators in the Cenomanian and Turonian Chalk of England

Czasopismo : Acta Geologica Polonica
Tytuł artykułu : Redox conditions in the Late Cretaceous Chalk Sea: the possible use of cerium anomalies as palaeoredox indicators in the Cenomanian and Turonian Chalk of England

Autorzy :
Gaetani, M.
Dipartimento di Scienze della Terra, Universita’ di Milano, Italia, maurizio.gaetani@unimi.it,
Meço, S.
Fakulteti Gjeologji-Miniera,Tirana, Albania, smeco_2001@yahoo.com,
Rettori, R.
Dipartimento di Scienze della Terra, Universita’ di Perugia, Italia, rrettori@unipg.it,
Henderson, C. M.
Department of Geoscience, University of Calgary, Canada, cmhendr@ucalgary.ca,
Tulone, A.
Dipartimento di Scienze della Terra, Universita’ di Perugia, Italia, accursio.tulone@hotmail.it,
Łuczyński, P.
Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93; PL-02-089 Warszawa, Poland, Piotr.Luczynski@uw.edu.pl,
Kozłowski, W.
Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93; PL-02-089 Warszawa, Poland, Wojciech.Kozlowski@uw.edu.pl,
Skompski, S.
Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93; PL-02-089 Warszawa, Poland, Skompski@uw.edu.pl,
Oszczypko, N.
Jagiellonian University, Institute of Geological Sciences, Oleandry 2a, 30-063 Kraków, Poland, nestor.oszczypko@uj.edu.pl,
Ślączka, A.
Jagiellonian University, Institute of Geological Sciences, Oleandry 2a, 30-063 Kraków, Poland, a.slaczka@uj.edu.pl,
Oszczypko-Clowes, M.
Jagiellonian University, Institute of Geological Sciences, Oleandry 2a, 30-063 Kraków, Poland, m.oszczypko-clowes@uj.edu.pl,
Olszewska, B.
Polish Geological Institute, Carpathian Branch, Skrzatów 1, 31-560 Kraków, Poland,
Jeans, C. V.
Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, U.K., cj302@cam.ac.uk,
Wray, D. S.
Department of Earth and Environment Sciences, University of Greenwich, Pembroke, Chatham Maritime, Kent ME4 4TB, U.K.,
Williams, C. T.
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, U.K.,
Abstrakty : The cerium anomalies preserved in the Chalk have been investigated as possible palaeoredox indicators of the Late Cretaceous Sea and its sediment. This has been based upon over a hundred new rare earth element analyses of selected samples and grain size fractions from the Chalk. Particular attention has been given to the methodology of differentiating between the cerium anomalies preserved in the bioclastic calcite and those in carbonate-fluorapatite preserved in the acetic acid insoluble residues of chalks. Variations in the cerium anomaly of different particle size fractions of uncemented chalks suggest that fractionation of rare earth elements between the Chalk’s seawater and the various organisms that contributed skeletal material to the bioclastic calcite of the Chalk may have occurred. Post-depositional processes of calcite cementation and late diagenetic sulphidisation have had no apparent effect on the cerium anomaly of the acetic acid insoluble residues. The cerium anomalies associated with the acetic acid insoluble residues from (1) an alternating sequence of chalks and marls from Ballard Cliff (Dorset, UK) typical of Milankovitch cyclicity show a marked diagenetic pattern, whereas those from (2) non-volcanic and volcanic marls display a pattern that is best explained by the variations in the availability of phosphorus and the timing of argillisation of volcanic glass during diagenesis. The general conclusion is drawn that the cerium anomalies preserved in the Chalk can provide an insight into the changing palaeoredox conditions in the Late Cretaceous Sea as well as in the pore fluids of its sediments.

Słowa kluczowe : pierwiastki ziem rzadkich, REE, anomalie, metody, diageneza, historia, chalk environments, rare earth element (REE) anomalies, methods, palaeoredox indicators, diagenesis, history,
Wydawnictwo : Faculty of Geology of the University of Warsaw
Rocznik : 2015
Numer : Vol. 65, no. 3
Strony : 345 – 366
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DOI :
Cytuj : Gaetani, M. ,Meço, S. ,Rettori, R. ,Henderson, C. M. ,Tulone, A. ,Łuczyński, P. ,Kozłowski, W. ,Skompski, S. ,Oszczypko, N. ,Ślączka, A. ,Oszczypko-Clowes, M. ,Olszewska, B. ,Jeans, C. V. ,Wray, D. S. ,Williams, C. T. , Redox conditions in the Late Cretaceous Chalk Sea: the possible use of cerium anomalies as palaeoredox indicators in the Cenomanian and Turonian Chalk of England. Acta Geologica Polonica Vol. 65, no. 3/2015
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