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Concurrent tectonic and climatic changes recorded in upper Tortonian sediments from the Eastern Mediterranean
Author(s) -
Köhler Cornelia M.,
Krijgsman Wout,
Van Hinsbergen Douwe J. J.,
Heslop David,
DupontNivet Guillaume
Publication year - 2010
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.2009.00916.x
Subject(s) - geology , tectonics , paleontology , sedimentary depositional environment , marl , sedimentary rock , structural basin , diachronous , plio pleistocene , climate change , pleistocene , oceanography
Terra Nova, 22, 52–63, 2010 Abstract The upper Tortonian Metochia marls on the island of Gavdos provide an ideal geological archive to trace variations in Aegean sediment supply as well as changes in the North African monsoon system. A fuzzy‐cluster analysis on the multiproxy geochemical and rock magnetic dataset of the astronomically tuned sedimentary succession shows a dramatic shift in the dominance of ‘Aegean tectonic’ clusters to ‘North African climate’ clusters. The tectonic signature, traced by the starvation of the Cretan sediment, now enables to date the late Tortonian basin foundering on Crete, related to the tectonic break‐up of the Aegean landmass, at c. 8.2 Ma. The synchronous decrease in the North African climate proxies is interpreted to indicate a change in the depositional conditions of the sink rather than a climatic change in the African source. This illustrates that interpretations of climate proxies require a multiproxy approach which also assesses possible contributions of regional tectonism.