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GEOLOGY starts 2013 with 25 new articles posted online ahead of print
Date:1/30/2013

org/10.1130/G33837.1">http://dx.doi.org/10.1130/G33837.1.

Adam Hudson and Jay Quade compare the modern lake areas of 130 closed basin lake systems on the Tibetan Plateau to the areas they occupied during the past warm period of the early Holocene. Past lake areas were calculated using abandoned shoreline features deposited around the lakes. Closed basin lakes have no outflowing rivers, so their surface area is directly related to the amount of precipitation and evaporation happening in their drainage basins. Hudson and Quade use this relationship to reconstruct the magnitude of rainfall increase associated with the intensification of the Asian summer monsoon in the region ~10,000 years ago. By comparing the past lake areas to the modern lake areas for lakes across the Tibetan Plateau, they take a regional look at how monsoon rainfall differed relative to today. They found that lakes located at the far western edge of the plateau increased fourfold to sixfold in area, but this expansion decreased to only about twofold in the center and eastern edge. This shows that rainfall in western Tibet increased more than to the east. This is in contrast to today, where the western plateau is much drier than the east. This difference indicates that monsoon rainfall may change asymmetrically during warmer climate.


Very high-resolution seismic stratigraphy of Pleistocene eustatic minima markers as a tool to reconstruct the tectonic evolution of the northern Latium shelf (Tyrrhenian Sea, Italy)
S. Fraccascia et al., MARUM, University of Bremen, 28359 Bremen, Germany. Posted online 17 Jan. 2013; http://dx.doi.org/10.1130/G33868.1.

S. Fraccascia and colleagues explore the characteristics of paleo-shelf break and lowstand submerged depositional terraces along the continental shelf offshore Latium (Tyrrhenian Sea, Italy). Using very high resolution seismic stratigraphy, the
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Contact: Kea Giles
kgiles@geosociety.org
303-357-1057
Geological Society of America
Source:Eurekalert  

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