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December 2008 Geology and GSA Today media highlights
Date:11/26/2008

ontribution to the carbon cycle. Lee et al. have tackled this conundrum by analyzing the composition and internal structure of granules at very fine scales using several newly developed electron microscope techniques. Their results have revealed that the granules form in a complex sequence of events involving several episodes of crystallization of different minerals. What is more remarkable is that these reactions are all mediated by the earthworm and completed very quickly, probably in less than a day. These results illustrate very clearly how the granules form, but Darwin's other question of why they are produced, and in such numbers, can only be answered by further work.


Source of fluids forming distal Zn-Pb-Ag skarns: Evidence from laser ablation-inductively coupled plasma-mass spectrometry analysis of fluid inclusions from El Mochito, Honduras

Iain M. Samson et al., Department of Earth & Environmental Sciences, University of Windsor, Windsor, Ontario N9B 3P4, Canada. Pages 947-950.

A significant proportion of the Earth's metal resources have been concentrated in the crust through the action of hot, saline (hydrothermal) fluids. In exploring for such metal resources, it is important to understand the processes that have led to metal concentration at particular locations. An issue that is especially important to address is the source of the fluids. Many zinc-lead-silver deposits are hosted by sedimentary rocks, yet the characteristics of some of these deposits point to the involvement of fluids derived from magmas. The chemical composition of the fluids responsible for metal deposits can reveal important information about the source of these fluids. This compositional data is only available from the analysis of the small aliquots of the fluids that are commonly trapped in minerals during their formation. Comprehensive chemical analysis of such fluid inclusions has recently been made feasible using laser ablation-inductively
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Contact: Christa Stratton
cstratton@geosociety.org
303-357-1093
Geological Society of America
Source:Eurekalert

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