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

to eruption. Additionally, uranium-lead dating on the same zircon crystals allows for a time-stamp of the evolutionary process. Within the Huckleberry Ridge Tuff, zircon analyses demonstrate that some of the crystal cargo was derived from previously erupted volcanic deposits, and the remaining crystals formed over a period of about 10,000 years. To complement the zircon findings, 40Ar/39Ar age data on sanidine crystals from the same rock show similar evidence for recycling of previously formed crystals, and provide an eruption age of 2.079 million years. The findings of this study show that, despite the large volume of magma (~2500 cubic kilometers), differentiation and cooling is geologically rapid, with most crystals forming several millennia prior to eruption.


740 Ma vase-shaped microfossils from Yukon, Canada: Implications for Neoproterozoic chronology and biostratigraphy
Justin V. Strauss et al., Dept. of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. Published online 9 June 2014; http://dx.doi.org/10.1130/G35736.1.

Biostratigraphy, or the use of fossils to help constrain time in ancient sedimentary rocks, underpins the more recent geological time scale, but its application to pre-Ediacaran (> ~541 million years old) strata has remained limited because older fossil taxa commonly have poorly understood preservational biases and/or inadequate geological or geochronological context. Here, we report the discovery of abundant and well-preserved vase-shaped microfossils from a Neoproterozoic carbonate deposit in Yukon, Canada, that highlight the potential for biostratigraphic correlation of Proterozoic sedimentary successions. The fossiliferous horizon, dated here with Re-Os geochronology at 739.9 plus or minus 6.1 million years, shares multiple species-level taxa with a well-characterized assemblage from the Chuar Group
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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