Köhler, Cornelia M; Krijgsman, Wout; van Hinsbergen, Douwe J J; Heslop, David; Dupont-Nivet, Guillaume (2010): (Appendix A) Sedimentation rate, geochemical and environmental magnetic proxies of the samples of the Metochia section, on the island of Gavdos, south of Crete. PANGAEA, https://doi.org/10.1594/PANGAEA.733305, Supplement to: Köhler, CM et al. (2010): Concurrent tectonic and climatic changes recorded in upper Tortonian sediments from the Eastern Mediterranean. Terra Nova, 22(1), 52-63, https://doi.org/10.1111/j.1365-3121.2009.00916.x
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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.
Related to:
Köhler, Cornelia M; Heslop, David; Dekkers, Mark J; Krijgsman, Wout; van Hinsbergen, Douwe J J; von Dobeneck, Tilo (2008): Tracking provenance change during the late Miocene in the eastern Mediterranean using geochemical and environmental magnetic parameters. Geochemistry, Geophysics, Geosystems, 9(12), Q12018, https://doi.org/10.1029/2008GC002127
Project(s):
Coverage:
Latitude: 34.850000 * Longitude: 24.090000
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | AGE | Age | ka BP | Geocode | ||
| 2 | Sedimentation rate | SR | cm/ka | Köhler, Cornelia M | ||
| 3 | Calcium | Ca2+ | mg/kg | Köhler, Cornelia M | ||
| 4 | Calcium carbonate | CaCO3 | % | Köhler, Cornelia M | ||
| 5 | Aluminium | Al | mg/kg | Köhler, Cornelia M | ||
| 6 | Accumulation rate, mass | MAR | g/cm2/ka | Köhler, Cornelia M | Al-mass accumulation rate | |
| 7 | Nickel | Ni | mg/kg | Köhler, Cornelia M | ||
| 8 | Accumulation rate, mass | MAR | g/cm2/ka | Köhler, Cornelia M | Ni-mass accumulation rate | |
| 9 | Chromium | Cr | mg/kg | Köhler, Cornelia M | ||
| 10 | Accumulation rate, mass | MAR | g/cm2/ka | Köhler, Cornelia M | Cr-mass accumulation rate | |
| 11 | Manganese/Aluminium ratio | Mn/Al | Köhler, Cornelia M | |||
| 12 | Titanium/Aluminium ratio | Ti/Al | Köhler, Cornelia M | |||
| 13 | Hard isothermal remanent magnetization | HIRM | mA/m | Köhler, Cornelia M | Calculated, see reference(s) | HIRM cfb |
| 14 | ARM, Intensity after demagnetization | ARM | mA/m | Köhler, Cornelia M | see reference(s) | ARM cfb |
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