Palaeoclimatic cyclicity in central Mediterranean Pliocene sediments; the mineralogical signal

Author(s): Foucault, Alain; Mélières, Frédéric
Author Affiliation(s): Primary:
Muséum National d'Histoire Naturelle, Laboratoire de Géologie, Paris, France
Other:
ETH-Zentrum, Switzerland
Volume Title: Mediterranean sapropels; observations, interpretations and models
Volume Author(s): Cita, Maria Bianca, editor; McKenzie, Judith A.
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 158(3-4), p.311-323; International conference on Neogene Mediterranean palaeoceanography; cycles, events and sea level, Erice, Italy, Sept. 1997, edited by Maria Bianca Cita and Judith A. McKenzie. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 62 refs.; illus., incl. sketch maps
Summary: A high resolution X-ray mineralogical study of four Pliocene sediment sections from the central Mediterranean (Punta Piccola, Sicily; Monte Singa and Vrica, Calabria; ODP Hole 964 A, Ionian Sea) shows cyclic opposite abundance variations of two groups of clay minerals. The first is dominated by palygorskite and kaolinite, whose abundance maxima can be interpreted as resulting from periods of aridity on the African continent, allowing their transport as wind-blown dust. The second is dominated by smectite, whose abundance maxima can be interpreted as indicative of periods of abundant rainfall on the Mediterranean borderlands. These variations in abundance show a 22 ky cyclicity, implying a control by the precession of the Earth's orbit. Sapropels and sapropelic layers always occur in the smectite-rich beds, and therefore appear to have been deposited during the wet periods. Abstract Copyright (2000) Elsevier, B.V.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Calabria Italy; Cenozoic; Central Mediterranean Sea; Clay mineralogy; Clay minerals; Climate change; Climate forcing; Cycles; East Mediterranean; Europe; Ionian Sea; Italy; Kaolinite; Leg 160; Marine sediments; Mediterranean Sea; Mediterranean region; Mineral composition; Monte Singa; Neogene; ODP Site 964; Ocean Drilling Program; Orbital forcing; Organic compounds; Paleo-oceanography; Paleoclimatology; Paleohydrology; Palygorskite; Pliocene; Provenance; Punta Piccola; Sapropel; Sediments; Sheet silicates; Sicily Italy; Silicates; Smectite; Southern Europe; Tertiary; Vrica Italy; Wind transport
Coordinates: N361538 N361538 E0174500 E0174500
N380000 N401000 E0170000 E0154500
N370000 N374500 E0130000 E0130000
Record ID: 2000045806
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands