Geochemical and isotopic signatures of igneous rocks
Office Hours: by appointment
Delehanty Hall, Room 215
Website: Coming soon
I am a Senior Research Technician in charge of the operation and maintenance of the Geology Department’s equipment, including the Inductively Coupled Plasma (ICP) instrument and a departmental computer lab. In addition, I am setting up a geochemical laboratory designed to separate radiogenic isotopes for Sr and Nd analyses in a variety of geological materials, including rocks, soils and waters. This will be the first laboratory of its type in Vermont.
My research interests center on determining the geochemical and isotopic signatures of igneous rocks that form and evolve in different types of plate tectonic settings. For example, my work on Miocene volcanic rocks in NW Mexico allowed me to identify 3 magma pulses that are associated with a transition from subduction to rifting during the formation of the Gulf of California. The tools I used in this project include dating igneous rocks by the K-Ar method, major and trace element chemical analyses as well as 87Sr/86Sr and 143Nd/144Nd isotope data collection. More recently I have been working on the geochemical signature of Cretaceous and Tertiary plutonic rocks of southeast Alaska. For this project I analyzed radiogenic isotopes from samples of mid-crustal plutons and dikes (87Sr/86Sr and 143Nd/144Nd and Pb) at facilities in the U.S. and Australia. Finally, I co-supervised two undergraduate students with their projects on volcanic rocks and thermal spring waters from Iceland after the geology expedition in the summer of 2004.
Thanks to the support of the A & S Dean’s office, the Geology Department computer laboratory has 22 iMacs operating with Mac OS X (snow leopard 10.5.8). This and our other research facilities are helping us to focus on a wide variety of analytical techniques in the geosciences and provide students with as many opportunities as possible.
Mora-Klepeis, G. and McDowell, F.W., 2004. Late Miocene calc-alkalic volcanism in northwestern Mexico: an expression of rift or subducion-related magmatism? J. of South American Earth Sciences 17, 297-310.
Roldán-Quintana, J., Mora-Klepeis, G., Calmus, T., Valencia-Moreno, M. and Lozano-Santacruz R., 2004. El graben de Empalme, Sonora, México: magmatismo y tectónica extensional asociados a la ruptura inicial del Golfo de California. Revista Mexicana de Ciencias Geológicas 21 (3), 320-334.
Mora-Alvarez, G. and McDowell, F.W., 2000, Miocene volcanism during late subduction and early rifting in the Sierra Santa Ursula of Western Sonora, Mexico in J. Stock, H. Delgado-Granados and G. Aguirre-Díaz, editors. Cenozoic Tectonics and Volcanism of Mexico. Geological Society of America Special Paper 334. pp. 123-141.
Mora-Alvarez, G. 1993. Relaciones estratigráficas y geocronológicas entre las unidades volcánicas de la Sierra Santa Ursula, en Sonora y el magmatismo de la región del Golfo de California. contribuciones a la Tectónica del Occidente de México, Monografía No. 1 de la UGM-SEP, L. A. Delgado y A. Martín, editores: 123-145 p.
Mora-Alvarez, G., Caballero-Miranda, C., Urrutia-Fucugauchi, J. and Uchiumi, S., 1991, Southward migration of volcanic activity in the Sierra de Las Cruces, basin of Mexico? -A preliminary K-Ar dating and paleomagnetic study. Geofís. Int. 30 (2), 61-70.
B.S. in Geological Engineering, Universidad Nacional Autónoma de México, 1986
M.A. in Geological Sciences, University of Texas at Austin, 1992
K-Ar Laboratory Manager, Geology Department, CICESE, Baja California, Mexico, 1992-1994