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Volatile ecosystems, a natural wind tunnel, volcanic lightning, and stress & strain on Venus
Date:12/11/2013

ata pertaining to spatial depositional patterns of the loess and on a field-scale natural experiment in the Gobi desert. Sand streaks, 50-km-long, emanating from dunes on the windward side of a prominent inselberg show a systematic leeward decrease in grain-size attributed to sand abrasion in the source dunes and subsequent deposition of the abraded products down-wind. This "natural wind tunnel" experiment at the zone of tempest winds in the Mongolian Gobi supports aeolian abrasion of sand grains as an effective mechanism of grain-size communition and the formation of coarse silt. Abrasion of sand in proximal dune fields appears as the most likely persistent source for massive downwind accumulation of the coarse silt forming the Chinese Loess Plateau.


Effect of water on the frictional behavior of cohesive rocks during earthquakes

M. Violay et al., (Affiliation for paper) Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy; (Current address) ETH D-ERDW, Sonnegstrasse, 5 CH-8092 Zrich, Switzerland; marie.violay@ingv.it. Published online ahead of print on 6 Dec. 2013; http://dx.doi.org/10.1130/G34916.1.

Fluid-rock interactions can control earthquake nucleation and the evolution of earthquake sequences. Experimental studies of fault frictional properties in the presence of fluid can provide unique insights into these interactions. We report the first results from experiments performed on cohesive silicate-bearing rocks (microgabbro) in the presence of pressurized pore fluids (H2O, drained conditions) at realistic seismic deformation conditions. The experimental data are compared with those recently obtained from carbonate-bearing rocks (Carrara marble). Contrary to theoretical arguments, and consistent with the interpretation of some field observations, we show that frictional melting of a mic
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Volatile ecosystems, a natural wind tunnel, volcanic lightning, and stress & strain on Venus
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