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Geosphere covers Mexico, the Colorado Plateau, Russia, and offshore New Jersey
Date:2/24/2014

bodies. Among various types of observations, it commonly uses the geometry of sedimentary layers at kilometer scale on seismic sections. This article is the first attempt to similarly use the geometry of sedimentary bedding at a meter scale. It shows that at all scales the orientation of sedimentary beds can be used as a stratigraphic tool related to sedimentation processes and to sea level.


The origin of intraplate magmatism in the western Trans-Mexican Volcanic Belt
Beatriz A. Daz-Bravo et al. (Corresponding author: Arturo Gmez-Tuena: tuena@geociencias.unam.mx or tuena@unam.mx), Centro de Geociencias, Universidad Nacional Autnoma de Mxico, Quertaro 76230, Mxico. Published online 21 Feb. 2014, http://dx.doi.org/10.1130/GES00976.1.

In this contribution we document the chemical characteristics of an unusual set of volcanic rocks from western Mexico. Erupted in one of the most complex tectonic settings on the planet, and with compositions that are more akin to oceanic islands than to convergent margins, these rocks provide a unique opportunity to understand the compositional underpinnings upon which a continent rests and grows. By combining traditional geochemistry with novel micro-analytical techniques, we characterize the pristine heterogeneous nature of the mantle source below Mexico and the petrologic and tectonic conditions that promote its melting.


40Ar/39Ar geochronology, isotope geochemistry (Sr, Nd, Pb), and petrology of alkaline lavas near Yampa, Colorado: Migration of alkaline volcanism and evolution of the northern Rio Grande rift
M.A. Cosca et al., U.S. Geological Survey, Box 25046, Denver Federal Center, Denver, Colorado 80225, USA. Published online 21 Feb. 2014, http://
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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