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Debris flows, landslides, fossil microatolls, paleo-seasonality, and carbonate ore deposits
Date:8/2/2012

h fluids uniquely explain the elevated 11B of arcs. B, O-H, and Sr isotopes indicate that serpentinization was driven by slab fluids that infiltrated the slab-mantle interface early in the subduction history.


Enhanced seasonality of precipitation in the Mediterranean during the early part of the Last Interglacial

Alice M. Milner et al., Department of Geography, University College London, London WC1E 6BT, UK. Posted online 1 August 2012; doi: 10.1130/G33204.1.

The Mediterranean is characterized by a strongly seasonal climate with hot dry summers and mild wet winters. With the rise of global temperatures and predicted warmer Mediterranean summers, understanding seasonality in this region is increasingly important. However, paleo-archives typically focus on mean annual conditions and are unable to resolve seasonal signals, meaning that trends in seasonality are rarely considered. Using new data from the Tenaghi Philippon peatland in Greece, a site renowned for its impressive record of Quaternary vegetation change, Alice M. Milner and colleagues apply a multi-proxy approach to investigate seasonality of precipitation during the early Last Interglacial (~130,000 to 119,000 years ago), an interval characterized by temperatures slightly warmer than today. Specifically, they address previous claims of abundant year-round rainfall during this interval, linked to deposition of organic-rich layers (sapropels) in the Mediterranean Sea. Detailed data from sediments, pollen, and macrofossils reveals evidence for both an increase in precipitation and summer aridity from the same sequence, which Milner and colleagues argue reflects an increase in seasonal contrast, with wetter winters and drier summers than the Holocene. Their finding may also indicate that winter precipitation in the northern borderlands of the Mediterranean influenced hydrographic conditions in the Mediterranean Sea that were crucial for the deposition of sapropels.


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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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