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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
Date:4/3/2014

e-phosphate solutions at 250 degrees Celsius and water-saturated pressure. They found that complex zoning patterns and solid solution between apatite and arsenate-bearing apatite that replace calcite formed within hours, and these zoning patterns were destroyed within days during secondary reactions. Borg and colleagues propose a two stage reaction process in the formation of the final reaction product. This paper highlights the complexity that can arise from ultra-local fluid composition variations due to rapid fluid-rock interaction in a short-lived event, for example during a seismic cycle. Interpretation of the complex zoning patterns to reflect the evolution of bulk fluid would not only be extremely complex but also erroneous.


Discovery of mafic impact melt in the center of the Vredefort dome: Archetype for continental residua of early Earth cratering?
C.L. Cupelli et al., Earth Science, University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada. Published online 21 Mar. 2014; http://dx.doi.org/10.1130/G35297.1.

A Canadian, U.S., and British geoscience team has discovered remnants of a giant magma lake created by flash melting of the crust by the largest and oldest known meteorite impact crater, the ~250 km wide Vredefort structure, south of Johannesburg, South Africa. The melt bodies produced just over two billion years ago were long presumed erased by erosion and have gone unrecognized over generations of geological research in the famous area. However through a combination of careful field mapping and analysis of the highly shock resistant mineral zircon, doctoral candidate Lisa Cupelli and her team have shown that bodies of impact melt did indeed survive in the ancient rocks of the crater floor. The unit is enveloped in gneiss and recrystallized by crater adjustments so that it no longer looks like the conventional "Sudbur
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
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