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Discovery of Earth's northernmost perennial spring
Date:6/16/2014

dx.doi.org/10.1130/G35718.1.

A new analysis of how mineral growth is controlled in the Earth shows that stresses may have an effect far larger than hitherto expected. This means that the ways we interpret the minerals observed in once deeply buried rocks require reappraisal. Stress in the Earth is a key aspect of its behavior and this theory paves the way for how ancient stress levels might be deduced from rocks in new ways. In the Earth, stresses result from, for example, movement of tectonic plates. As stress is applied slowly over time, rocks deform and change shape forming aligned mineral textures which are very common. Despite this it has previously been assumed the effects of stress on new mineral growth are small. New calculations show the effects of stress are much bigger and this means that current interpretations of mineral growth require modification; the theory presents a new quantitative way to think about mineral growth during deformation in rocks. It may also be of interest in metallurgy. Metals, like rocks, are actually interlocked crystals of different chemistries and are often processed by deformation which occurs in parallel with chemical change.


Rapid magma evolution constrained by zircon petrochronology and 40Ar/39Ar sanidine ages for the Huckleberry Ridge Tuff, Yellowstone, USA
Tiffany A. Rivera et al., Quaternary Dating Laboratory, Roskilde University, Universitetsvej 1, 4000 Roskilde, Denmark, and Dept. of Geosciences, Boise State University, 1910 University Drive, Boise, Idaho 83725, USA. Published online 9 June 2014; http://dx.doi.org/10.1130/G35808.1.

The Huckleberry Ridge Tuff is the product of the largest eruption at Yellowstone. The mineral zircon, present within this volcanic deposit, has been analyzed for its chemical composition and crystallization temperature in order to deduce the path of magmatic evolution prior
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Discovery of Earth's northernmost perennial spring
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