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Seafloor, sea-level, shear zones, subduction, sedimentation, and seismology
Date:1/14/2014

sediments. We observe that, despite important variations in precipitation across the studied region there are no corresponding systematic changes in denudation. On the other hand, we observe a strong gradient of denudation across the range, from the lowlands of the Lesser Himalaya to the high relief mountains of the Greater Himalaya, which mimics the inferred pattern of tectonic uplift in that area. We conclude that this similarity in patterns suggests a dominant control of Himalayan denudation by tectonic uplift, with a minor influence of climate. Such result questions the viability of models proposing that climate could be a major driver of tectonic deformation in actively deforming mountain ranges.


Did Late Miocene (Messinian) gypsum precipitate from evaporated marine brines? Insights from the Piedmont Basin (Italy)
Marcello Natalicchio et al., Dipartimento di Scienze della Terra, Universit di Torino, 10125 Turin, Italy; marcello.natalicchio@unito.it; marcello.natalicchio@gmail.com. Posted online 10 January 2014, http://dx.doi.org/10.1130/G34986.1.

Marcello Natalicchio and colleagues convey the results of the first detailed analysis of fluid inclusion salinities in Messinian gypsum crystals, providing new constraints for hydrologic models explaining widespread gypsum precipitation during the Messinian salinity crisis. This study demonstrates that at the northernmost offshoot of the Mediterranean Basin, gypsum did not form just from pristine evaporated seawater, but rather from a mix of seawater and Ca2+ and SO42- enriched non-marine waters probably derived from partial dissolution and recycling of coeval marginal marine deposits. Complex recycling processes should also be taken in account for explaining the genesis of other similar Messinian gypsum
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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