Department of Geology and Environmental Sciences
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Tracing Nitrogen in Volcanic and Geothermal Volatiles from the Nicaraguan Volcanic Front
(Meteoritical Society, 2006)We report new chemical and isotopic data from 26 volcanic and geothermal gases, vapor condensates, and thermal water samples, collected along the Nicaraguan volcanic front. The samples were analyzed for chemical abundances ... -
U-series Disequilibria in Guatemalan Lavas, Crustal Contamination, and Implications for Magma Genesis Along the Central American Subduction Zone
(American Geophysical Union, 2007)New U-series results indicate that Guatemalan volcanic rocks display both 238U and 230Th excesses. 230Th excess is restricted to volcanoes in central Guatemala, both along and behind the front. 230Th excess correlates ... -
Geometry and kinematics of the Nuncios detachment fold complex: implications for lithotectonics in northeastern Mexico
(American Geophysical Union, 2005-08)Using recent geologic mapping combined with digital elevation data, aerial photo interpretation, and cross section balancing, we describe the threedimensional (3-D) geometry and kinematics of the Nuncios Fold Complex ... -
The influence of flaws on joint spacing and saturation: results of one-dimensional mechanical modeling
(American Geophysical Union, 2006-07)In bedded sedimentary or mechanically anisotropic rocks, joints often occur in laterally persistent, parallel sets with distinctive spacing attributes. Three of those attributes include a positively skewed distribution of ...
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