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GEOLOGY starts 2013 with 25 new articles posted online ahead of print
Date:1/30/2013

g, where eruptions are caused by sudden flashing of superheated water into steam. In contrast, these data fit the models using the less-explored type of plumbing, where pressurized steam gradually accumulates in an underground cavity (bubble trap) and periodically erupts through a water-filled, highly contorted conduit with the configuration of an inverted siphon. Conduits of the studied geysers were developed from erosion by ascending geothermal water in landslide deposits having chaotic internal structures. Belousov and colleagues suggest that geyser fields are rare on Earth because they require the combination of hydrothermal discharge and geological formations having specific mechanical properties and structures (that facilitate the generation of highly contorted conduits).


70 Ma chemical zonation of the Tristan-Gough hotspot track
Joana Rohde et al., GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1-3, 24148 Kiel, Germany. Posted online 25 Jan. 2013; http://dx.doi.org/10.1130/G33790.1.

Hotspot tracks are age-progressive chains of volcanoes that form as lithosphere moves over a mantle plume. Some Pacific hotspot tracks display a spatial geochemical zonation with distinct isotopic domains attributed to their location above the margin of the Pacific superplume, a large-scale low-shear velocity province in the lower mantle beneath the southern Pacific. Joana Rohde and colleagues investigate geochemical variations along the Tristan-Gough hotspot track in the South Atlantic to evaluate if such spatial compositional heterogeneities also exist in the Atlantic. They observe that the isotopic compositions display a bilateral zonation with two distinct mantle source compositions, making Tristan-Gough the first chemically zoned plume to be recognized overlying the African superplume. Moreover, the zonation is traced for at least 70 million years, four times
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Contact: Kea Giles
kgiles@geosociety.org
303-357-1057
Geological Society of America
Source:Eurekalert  

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