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Glacial buzz-saws, gold in fool's gold, fingerprints in sea water, and fluvial iron
Date:10/19/2013

approximately 2.5 billion-years-ago. In this paper, Peir Pufahl, with Franco Pirajno and Eric Hiatt, introduce a new type of iron formation, fluvial iron formation, which formed by mixing river discharge and seawater in coastal environments. Their results are significant because it shifts the locus of known iron formation precipitation processes into estuarine settings, providing a new window for understanding ocean-atmosphere development on the early Earth.


Kimberlite (U-Th)/He dating links surface erosion with lithospheric heating, thinning, and metasomatism in the southern African Plateau
Jessica R. Stanley et al., Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309, USA; jessica.stanley@colorado.edu. Co-authors: Rebecca M. Flowers, and David R. Bell. Posted online ahead of print 16 Oct. 2013; http://dx.doi.org/10.1130/G34797.1.

Documenting the response at Earth's surface to processes at depth is a central challenge in continental tectonics. Kimberlites are ultramafic magmas derived from a depth greater than 150 km, famous for bringing diamonds to the surface, as well as other information about the state of the lithosphere in the form of mantle xenoliths. Though less well studied, kimberlites also contain xenoliths from sedimentary units present at the time of eruption, which may have since eroded away. In this study, Jessica Stanley, Rebecca Flowers, and David Bell combine constraints from sedimentary xenoliths with cooling histories derived from apatite (U-Th)/He dating of kimberlites to constrain 1-2 km of Mesozoic erosion across the interior of South Africa. This erosion pulse is contemporaneous with heating, thinning, and metasomatism of the lithosphere below documented in the mantle xenoliths from these same pipes. Thus, the data presented here appear to record the surface re
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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