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Robertson A H F Emeis K C Richter C and Camerlenghi A Eds 1998 Proceedings of the Ocean Drilling Program Scientific Results Vol 160 18 MINERALOGICAL RECORD OF CYCLIC CLIMATE CHANGES IN MEDITERRANEAN MIDPLIOCENE DEPOSITS FROM HOLE 964A IONIAN BASIN AND FROM PUNTA PICCOLA SICILY 1 Fr d ric M li res 2 Alain Foucault 2 and Marie Madeleine Blanc Valleron2 ABSTRACT Mid Pliocene sediments from Ocean Drilling Program Hole 964A Ionian Basin and from Punta Piccola outcrop Sicily Italy consist of light colored carbonate rich marls decimeter to meter thick alternating with dark colored carbonate poor organic matter rich beds 1 25 cm thick These sediments show cyclic variations in their mineralogical content especially in the clay mineral relative percentages Palygorskite and kaolinite are abundant in carbonated intervals whereas smectite and chlorite dominate in dark ones As palygorskite is known to originate from Africa through wind transportation we interpret these cyclic variations to be a result of the alternation of dry periods with dominant eolian sedimentary input from the south and humid periods with dominant fluvial supply Mid Pliocene sediments recovered from Hole 964A Fig 1 of the Ocean Drilling Program ODP Leg 160 Shipboard Scientific Party 1996 and those of the same age observed in the southern Sicily outcrops of Punta Piccola Brolsma 1978 Hilgen 1987 1991 Foucault and M li res 1995 show similar facies and similar sedimentary cycles which seem to be controlled by astronomically induced climatic changes Hilgen 1991 Lourens et al 1996 The aim of this study is to analyze these sediments to interpret the cycles in terms of sedimentary and paleoclimate processes 12 42 N 14 16 40 TYRRENIAN SEA 38 40 0 38 30 00 m IONIAN 10 36 00 m 36 Punta Piccola 34 12 E SEA 964A 30 00 m Robertson A H F Emeis K C Richter C and Camerlenghi A Eds 1998 Proc ODP Sci Results 160 College Station TX Ocean Drilling Program 2 Laboratoire de G ologie Mus um National d Histoire Naturelle 43 rue



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