The origin of intraplate magmatism in the western Trans-Mexican Volcanic Belt
Beatriz A. Daz-Bravo et al. (Corresponding author: Arturo Gmez-Tuena: email@example.com or firstname.lastname@example.org), 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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