About Dr. David Gonzales
David Gonzales is a professor of geology at Fort Lewis College. He is an alumnus of Fort Lewis College (1982) and after his graduate studies joined the college in 1997. Dr. Gonzales is interested in research that focuses on the magmatic, tectonic and landscape evolution in the Four Corners region. He frequently involves students in his research and has received funding from the National Science Foundation, the U.S. Geological Survey EDMAP program, Kinder Morgan and other sources to support his research. He has served as a reviewer for many academic journals, geologic software products, and grant programs. In addition, Dr. Gonzales has been a geological consultant for numerous companies and academic activities.
Dr. Gonzales was the 2006-2007 Featured Scholar and the 2003 recipient of the New Faculty Teaching Award at Fort Lewis College. He lectures and presents his research at professional geological conferences around the country.
I. The Timing of Magmatic Events that are Preserved in the Western San Juan Mountains
Since 2011, Dr. Gonzales and students in the Department of Geosciences have conducted research on the timing of magmatic events that are preserved in the western San Juan Mountains. This work is being presented in a peer review publication and several presentations at the Rocky Mountain sectional meeting of the Geological Society of America in May 2015.
About the Research
Rocks have stories to tell about the process and events of earth’s history. Understanding the timing of geologic events recorded in rocks helps scientists decipher the patterns and interconnections of different geologic events. In the western San Juan Mountains, intrusive rocks (melted rock emplaced below the surface) are closely tied to periods of mineralization and mountain building. Dr. Gonzales has spent the last three years obtaining radiometric ages on these rocks from the minerals they contain. This research has allowed patterns of intrusive activity to be better defined, giving insight into the connections of magmas with other parts of the geologic history. Dr. Gonzales’s research has also contributed to a new understanding of the “birthdays” of some iconic features, such as Engineer Mountain north of Durango, Colorado, which had never had an age assigned (today, Dr. Gonzales and his team know that it formed about 17 million years ago).
Dr. Gonzales Explains the Project
“The western San Juan Mountains are a virtual warehouse of geologic wonders, and yet our understanding of the magmatic history has been limited. This is due to a lack of data, and the fact that some older age constraints are not reliable. The formation of magma bodies in the region made mountains, changed the courses of rivers, created mineral deposits and contributed to thermal springs. My research on the timing of magmatic events is the most extensive to date, and provides keen insight into the magmatic events over the past 80 million years.”
II. The Origin of Carbon Dioxide Gas in the Four Corners
Since 2008, Dr. Gonzales has been conducting research on mantle rocks in the Navajo volcanic field that have high concentrations of carbonate minerals, suggesting a possible connection between these magmas and subsurface carbon dioxide reservoirs. That research was the catalyst for ongoing research using noble gas isotopes to explore the origin of the carbon dioxide gas in the Four Corners.
About the Research
After a visit to a naturally carbonated spring in Gerolstein, Germany, Dr. Gonzales began to explore the idea that the high concentrations of carbon dioxide gas found in deep wells in southwestern Colorado might also have a connection to mantle magmas.
In order to gain insight into the origin of carbon dioxide trapped in deep reservoirs in southwestern Colorado, Dr. Gonzales obtained a full spectrum of noble element isotope signatures (Ar, Ne, He, K, Xe) from subsurface gas samples. Previous ideas held that the gases were created by thermal metamorphism of carbonate reservoir rocks or directly from magmas. The isotopic signatures of noble gases can provide insight into whether the isotope was generated by magmas, surface water or atmospheric sources or other sources in the earth’s crust.
Dr. Gonzales Explains the Project
“This project is being done in collaboration with Kinder Morgan and Dr. Thomas Darrah at Ohio State University. Kinder Morgan is interested in the ultimate source of the gas, and provided support to conduct this research and involve undergraduate students from the Department of Geosciences. The data for this research reveals a complex history that involved magmas that formed in the region from 80-5 million years ago. Noble gas isotopes provide important ‘tracers’ for understanding not only where the gas may have come from, but also its history.”
Publications and Presentations
"New U-Pb Zircon and 40Ar/39Ar Age Constraints on the Late Mesozoic to Cenozoic Plutonic Record in the Western San Juan Mountains," The Mountain Geologist, 52(2), 5-42, 2015
“New U/Pb Zircon and 40Ar/39Ar Age Constraints on the Late Mesozoic to Cenozoic Plutonic Record,” Southwestern Colorado: Implications for Regional Magmatic-Tectonic Evolution, 2015
“Petrographic and Geochemical Constraints on the Provenance of Sanidine-Bearing Temper in Ceramic Potsherds,” Four Corners Region, Southwest USA, 2015
“Geology of the Durango-Silverton Train Route,” Durango-Silverton Narrow Gauge Railroad Guide, 2013
“The Benefits of Research in Undergraduate Education: Perspectives From a Teacher and Students,” The Professional Geologist, 2013
“A Legacy of Mountains: Mountains Past and Present in the San Juan region, Colorado— Geology, Ecology, and Human History," University Press of Colorado and Mountain Studies Institute, 2011
“New Insight into the Timing and History of Diatreme-Dike Complexes of the Northeastern Navajo Volcanic Field, Southwestern Colorado,” Geology of the Four Corners Country, 2010