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Understanding Earth processes and human impacts, plus another look at Mars
Date:3/27/2013

the crater center far from crater-wall katabatic winds, until the increasing relief of the resulting mound generates mound-flank slope winds strong enough to erode the mound. The slope wind enhanced erosion and transport (SWEET) hypothesis indicates mound formation dominantly by aeolian deposition with limited organic carbon preservation potential, and a relatively limited role for lacustrine and fluvial activity. Morphodynamic feedbacks between wind and topography are widely applicable to a range of sedimentary and ice mounds across the Martian surface, and possibly other planets.


Anoxia in the terrestrial environment during the late Mesoproterozoic

Vivien M. Cumming et al., Dept. of Earth Sciences, Durham University, South Road, Durham DH1 3LE, UK. Posted online ahead of print of 26 March 2013; http://dx.doi.org/10.1130/G34299.1.

A significant body of evidence suggests that the marine environment remained largely anoxic throughout most of the Precambrian. In contrast, little attention has been paid to the oxygenation history of terrestrial aquatic environments -- despite the significance of such settings for early eukaryote evolution. Vivien M. Cumming and colleagues address this lack by providing a geochemical and isotopic assessment of sediments from the late Mesoproterozoic Nonesuch Formation of central North America. They utilize rhenium-osmium (Re-Os) geochronology to yield a depositional age of 1078 million years (plus or minus 24 million years), while Os isotope compositions support existing evidence for a lacustrine setting. Fe-S-C systematics suggest that the Nonesuch Formation was deposited from an anoxic Fe-rich (ferruginous) water column. Thus, similar to the marine realm, anoxia persisted in terrestrial aquatic environments in the Middle to Late Proterozoic, but sulfidic water column conditions were not ubiquitous. The data suggest that oxygenati
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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