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My research focuses on the use of radiogenic and heavy stable isotopes to study the evolution of the crust and mantle through time, the genesis of ore deposits, paleogeography, and environmental and archeological problems.
I have collaborative research on the genesis of the goldfields of the Witwatersrand basin of South Africa using Os isotopes, mantle metasomatism and crustal contamination in arc magmatism in Chile, Mexico, and the Cascades of the western US using Sr, Nd, and Os isotopes, tracing archeological objects in Mesoamerica using Pb and Os isotopes, tracing contamination in rivers in Mexico and Arizona, US, using Pb isotopes, understanding Cu leaching in base metal deposits using Fe and Cu isotopes, understanding soil formation in Hawaii using Fe and Cu isotopes, understanding the tectonic evolution of Mexico during the formation of Rodinia and Pangea using laser ablation Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) U-Pb geochronology.
All my projects are interdisciplinary and involve collaborations with researchers and students from many parts of the world. A current biography (see Recent CV below) lists the papers that have been written from these collaborations.Show Less
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Courses
- PGPetrology of Gems
- IGIntroduction to Geochemistry
Grants
- Controlled Environment Agriculture Indoor and Vertical Food Projection Coordinated Research Conference
Co-Investigator (COI)
2019
$50.0K
- Facility Support: Multi-User Facility Support for U-Th-Pb Geochronology and Complementary Isotope Geochemistry and SEM Imaging at the Arizona LaserChron Center
Co-Investigator (COI)
2017
$1.0M
- Rare Earth Elements Tracing Crustal Evolution Through Time: A Detrital Zircon Study
Co-Investigator (COI)
2017
$212.6K
- Facility Support: Mulit-User Facility Support for U-Th-PB Geochronology & Complementary Isotope Geochemistry & SEM Imaging at the AZ LaserChron Center
Co-Investigator (COI)
2014
$908.2K
- Facility Support: Multi-User Facility Support for U-TH-Pb Geochronology and Complementary Isotope Geochemistry and SEM Imaging at the Arizona Laserchron Center
Co-Investigator (COI)
2014
$122.7K
- Facility Support: Multi-User Facility Support for the U-TH-PB Geochrono Logy & Complementary Geochemistry ... AZ Laserchron Center
Co-Investigator (COI)
2011
$809.7K
- UA Guinea Offshore Seismic and Tectonic Analysis, Phase II
Co-Investigator (COI)
2011
$510.0K
- CPATH-2: Computational Thinking as a Foundation for Interdisciplinary Undergraduate Education
Co-Investigator (COI)
2009
$800.0K
- Developing Heavy Stable Isotopes for Provenance of Turquoise, Metals and Glass
Co-Investigator (COI)
2009
$269.7K
- Support for Sustainability Initiative for the Professional Science Master's
Principal Investigator (PI)
2008
$85.8K
News
- Members of France-Arizona Institute for Global Grand Challenges convene in Tucson to reflect on partnership's first year
2022
- UArizona Gem & Mineral Museum is open and ready for gem show crowd
2022
- University Mourns Loss of Renowned Mineral Exploration Geologist and Philanthropist J. David Lowell
2020
- 'Catalysts of Change' is Theme of Arizona Science Lecture Series
2020
- UArizona Launches Tumamoc Stewards Program
2019
- 'Rainforest Under Glass' Kissed by Rain After Two-Month Drought
2019
- 'Searching for Certainty' is Theme of UA Science Lecture Series
2019
- Robbins Introduces UA Science Series
2018
- Biosphere 2 to Host Expo and High-Speed Drone Race
2018
- 'Humans, Data and Machines' Is Theme of UA Science Series
2018
- UA Leads Project on Big Data and Black Holes
2018
- New Research Unveils True Origin of Ancient Turquoise
2018
- UA Geoscientists Take a Crack at Paradox Basin's Mysteries
2017
- Exploring Tumamoc Hill: There's an App for That
2017
- $30M Gift Announced for UA's Biosphere 2
2017
- UA Science Lecture Series on 'Rethinking Reality'
2017
- UA Research Sheds New Light on Early Turquoise Mining in Southwest
2017
- UA at the Forefront as Climate Change Heats Up
2016
- Ben Wilder Named Interim Director of UA's Tumamoc Hill
2016
- UA Science Lecture Series to Focus on Climate Change
2016
- Impey Named Associate Dean of College of Science
2016
- $1M Endowment to Support Science, Math Students
2016
- Tumamoc Hill Promotes Learning, Stewardship
2015
- Mirror Lab Renamed in Honor of Richard F. Caris
2015
- UNAM Center for Mexican Studies Launches
2015
- UA Ranked Second in the Nation for Physical Sciences Research Funding
2014
- UA Professor Starts Company to Focus on Supporting Common Core Mathematics Standards
2014
- The Man Behind the UA's Presence in Mexico
2014
- The Lord of the Tree Rings
2014
- $20 Million Gift Pushes UA Closer to the Stars
2014
- U.S. and Mexican Officials Discuss Innovation, Joint Research During Meeting at UA
2014
- $50M Gift From Haury Estate to Focus on Environment, Society and Southwest
2014
- UA Strengthens Research, Entrepreneurial Activities With Cross-Border Collaborations
2014
- 20 Tons of Glass, Fresh from the Oven
2013
- UA Undergraduate Students Raise Awareness About Diabetes
2013
- UA Science Lecture Series: Genomics Now
2013
- UA Science Lecture Series: Living Beyond 100
2012
- UA Scientists Bring Research Messages to Washington, D.C.
2012
- Celebrate Tumamoc! Event Runs Next Two Weekends
2012
- Nobel Laureate, UA Alumnus Urges Grads to Chase Dreams
2012
- UA Advancing Communiversity Concepts
2012
- Two UA Professors Elected to National Academy of Sciences
2012
- Regents' Professor Michael J. Drake, 1946-2011
2011
- Visit Mars - at a Discount
2011
- UA College of Science to Hold Public Forum on Japan Disaster
2011
- UA Tree-Ring Lab to Get New Home
2011
- Biosphere 2 to Have a Permanent Home With the UA
2011
- UA Science Lecture Series Reaches Toward Our Cosmic Origins
2011
- Telescope-Building Project Aims to Boost the Sciences
2011
- College of Science Partnering With Local Geotourism Attractions
2011
- Biosphere 2 Dedicates Lectures to Memory of Michael J. Drake
2011
- Employees Honored With Staff Awards for Excellence
2010
- UA Planetary Scientist Elected to the National Academy of Sciences
2010
- NSF Grant Creates Undergraduate Research Program at Biosphere 2
2010
- College of Science Announces 2010 Galileo Circle Fellows
2010
- UA Leads the Nation in Physical Sciences Research Funding
2010
- Flandrau Planetarium and Exhibits Celebrate Reopening Saturday
2010
- Joaquin Ruiz Elected Geological Society President
2010
- Lecture Series to Focus on Higher Education and the Economy
2010
- College of Science Spring Lectures Focus on "Mind and Brain"
2010
- Four to Receive Honorary Degrees at Commencement
2010
- Seven Honorary Degree Recipients to be Recognized During Spring Commencement
2009
- New Emerging Contaminants Lab Holds Open House Jan. 21
2009
- Beth Mitchneck Named Interim Dean of UA College of Social and Behavioral Sciences
2009
- US-Mexico Border Research Initiative Announced
2009
- Spencer Titley Honored for Half-Century of Teaching and Research at UA
2009
- Biosphere 2 Will Celebrate Earth Day With Music, Art and Science
2009
- Telethon for Spanish-Language Speakers Promotes Higher Education
2009
- Fine Arts to Join Colleges of Letters and Science
2009
- College of Science Lectures Focus on "Next: Science That Transforms"
2009
- Biosphere 2 to Host International Year of Astronomy Program Saturday
2009
- UA School Promotes Interdisciplinary Teaching in Computation
2009
- Spring 2009 Biosphere 2 'Let's Talk Science' Public Lectures
2009
- Dean Named for UA College of Social and Behavioral Sciences
2009
- College of Science Announces 2009 Galileo Circle Fellows
2009
- Telescope Mirror Casting Strengthens Scientific Ties Between U.S. and Mexico
2009
- Jory Hancock Named UA Fine Arts Dean
2009
- Institute on Science for Global Policy Draws Top Scientists, Policymakers To Discuss Infectious Diseases
2009
- Snapshot in Time: The Changing College of Science
2009
- Joaquin Ruiz Named Outstanding Researcher by Mexican Government
2009
- UA Professor to Take Fine Arts Interim Deanship
2009
- Under New Management
2008
- Former Biospherian to Speak at Biosphere 2 March 8
2008
- UA Invites Public to View Stars from Mount Lemmon SkyCenter
2008
- Four UA Colleges to Form New Partnership
2008
- Kurzweil Will Lecture Via Teleport on Humans of the Future
2008
- College of Science Names 2008 Galileo Circle Fellows
2008
- College of Science Lecture Series Explores the Edges of Life
2008
- State's Leading Spanish Language Television Station to Promote the UA
2008
- Desert Laboratory Director Honored by Ecological Society of America
2008
- Middle School Students Work on Research Projects at the UA
2008
- Congresswoman Giffords Holds Briefing at UA
2008
- UA Science Dean Will Talk on 'Earth Evolution' at Biosphere 2
2008
- Peter Smith Named Thomas R. Brown Distinguished Chair in Integrative Science
2008
- UA to Open STEM Teacher Education Resource Center at Biosphere 2
2008
- UA Astronomer Xiaohui Fan Wins Guggenheim Fellowship
2008
- UA Departments of Chemistry and Biochemistry and Molecular Biophysics to Merge
2008
- Arizona Radiocarbon Dating Lab Turns 25
2007
- National Science Foundation Names UA No. 1 for Physical Science Research
2007
- The Mysterious Case of Columbus's Silver Ore
2007
- UA College of Science Announces 2007 Galileo Circle Fellows
2007
- College of Science Lecture Series Moves to the Arizona Science Center
2007
- Robert McCall to Donate More Than 200 Pieces to UA Museum of Art
2007
- The University of Arizona Launches Major Scientific Research Initiative at Biosphere 2
2007
- Public Invited to Wildcat School on April 28
2007
- Nobel Peace Prize Winner has UA Connections
2007
- UA Hispanic Alumni Committee to Honor Hispanic Science Achievement
2007
- UA Campus Telescope To Be Renamed for Raymond E. White Jr.
2007
- UA College of Science Announces 2006 Galileo Circle Fellows
2006
- UA, City Agree on Plan that Allows Continued, But Limited, Access to Tumamoc Hill
2006
- Global Climate Change Lecture Series Kicks Off College of Science's Theme Semester
2006
- Evolution Lecture Series Kicks off the UA College of Science's First Theme Semester
2006
- UA to Unveil New Chemical Sciences Facility
2006
- UA Science Dean to Lecture on Origins of South Africa's Gold
2006
- UA Holds 134th Commencement May 13
2006
- Clues to African Archaeology Found in Lead Isotopes
2006
- UA Part of Center for Biodefense, Emerging Infectious Diseases Research
2005
- UA College of Science Announces 2005 Galileo Circle Fellows
2005
- Local Students Spend Their Summer in UA Labs
2005
- 2005 Award for Excellence: Rachel L. Tapia
2005
- Pierre Meystre Focuses on 'UA Physics 2020' Department
2005
- Arizona Regents Approve UA Astrobiology Center
2005
- UA Ecologist Awarded Packard Fellowship of $625,000
2005
- UA Geoscientist Elected to National Academy of Engineering
2005
- Phoenix Mission Gets Thumbs Up to Prepare for 2007 Launch
2005
- Memorial Service for Pioneering Geoscientist
2005
- Chemistry Groundbreaking Sept. 23
2004
- UA Evolutionary Biologist Elected to National Academy of Sciences
2004
- UA Leads Effort to Create Center for Mathematics Education of Latinos
2004
- Ciencia Es Muy Importante: UA Science Dean Hosts Radio Show in Spanish
2004
- UA to Celebrate 130th Commencement
2004
- Mosquito Researchers Track Dengue Fever in Sonora, Mexico
2004
- UA College of Science Chooses First Galileo Circle Fellows
2004
- UA Cares Campaign Kicks Off
2004
- College of Education Dean Search Continues
2003
- University Honors Nursing Faculty with Flowering Trees
2003
- UA Hosts 2003 Academy's Awards
2003
- UA Cares Campaign to Kick Off Nov. 13
2002
- UA Scientists Begin Field Work on Chicxulub Drilling Project
2002
- College of Science Announces External Advisory Board
2002
- College of Education Dean Search Continues
2002
- Scientists Discover That 40 Percent of the World's Gold is 3 Billion Years Old
2002
- NSF Grant to Aid Archaeological Sciences
2002
- Year in Review 2001: Flandrau Science Center
2001
- UA President to Co-chair Science Center Board
2001
- Undergraduate Research Conference Set for Aug. 1
2001
- President Gives Update on Campaign Planning
2000
- Provost's General Education Teaching Award: Geosciences Professor George Gehrels is an Instructor Who Likes a Challenge
2000
- 2000 Nobel Laureate to Launch UA Optics Valley Lecture Series Nov. 9
2000
- Ruiz Named New Dean of the College of Science
2000
Publications (62)
Recent
- New U-Pb and Re-Os geochronology of Laramide porphyry copper mineralization along the Cananea lineament, northeastern Sonora, Mexico: Contribution to the understanding of the Cananea copper district
2017
- PRODUCTION OF A H-2 RICH GAS FROM BIODIESEL DERIVED GLYCEROL BY CATALYTIC STEAM REFORMING AS A SOLUTION TO IMPROVE BIODIESEL ECONOMY
2016
- Pore water chemistry reveals gradients in mineral transformation across a model basaltic hillslope
2016
- Late Cretaceous porphyry copper mineralization in Sonora, Mexico and the implications for the evolution of the SW North America porphyry copper deposit Province
2016
- Short-range gold mobilisation in palaeoplacer deposits
2015
- Genesis of manganese oxide mineralization in the Boleo region and Concepcion Peninsula, Baja California Sur: constraints from Pb-Sr isotopes and REE geochemistry
2015
- Bacteraemia due to Escherichia coli producing extended-spectrum beta-lactamases (ESBL): clinical relevance and today's' insights
2015
- Isotopic evidence for the provenance of turquoise in the southwestern United States
2015
- Evidence for mixing of Re-Os isotopes at 2.7 Ga and support of a remobilized placer model in Witwatersrand sulfides and native Au
2015
- Late Carboniferous porphyry copper mineralization at La Voluntad, Neuquen, Argentina: Constraints from Re-Os molybdenite dating
2015
- Significance of Provenance Ages from the Chiapas Massif Complex (Southeastern Mexico): Redefining the Paleozoic Basement of the Maya Block and Its Evolution in a Peri-Gondwanan Realm
2014
- Immigration Law Jeopardizes University Collaboration
2014
- Coagulase-negative Staphylococcus bacteraemia: prognosis factors and influence of antibiotic treatment
2014
- Routine low-damage apatite U-Pb dating using laser ablation-multicollector-ICPMS
2014
- Study of a cohort of patients with Enterococcus spp. Bacteraemia. Risk factors associated to high-level resistance to aminoglycosides
2014
- CARETAKERS KNOWLEDGE, ATTITUDES AND PRACTICES ABOUT ANTIBIOTIC USE IN CHILDREN IN A SETTING WHERE ANTIBIOTICS ARE AVAILABLE WITHOUT MEDICAL PRESCRIPTION
2013
- Water-rock-tailings interactions and sources of sulfur and metals in the subtropical mining region of Taxco, Guerrero (southern Mexico): A multi-isotopic approach
2013
- Rayleigh fractionation of iron isotopes during pedogenesis along a climate sequence of Hawaiian basalt
2013
- Bioenergy II: Hydrogen Production by Aqueous-Phase Reforming
2013
- Fingerprinting two metal contaminants in streams with Cu isotopes near the Dexing Mine, China
2013
- Hydrothermal evolution of the porphyry copper deposit at La Caridad, Sonora, Mexico, and the relationship with a neighboring high-sulfidation epithermal deposit
2013
- Nosocomial candidemia at a general hospital: prognostic factors and impact of early empiric treatment on outcome (2002-2005)
2013
- Diarrheal Disease in Rural Mozambique: Burden, Risk Factors and Etiology of Diarrheal Disease among Children Aged 0-59 Months Seeking Care at Health Facilities
2013
- A novel approach to lead isotope provenance studies of tin and bronze: applications to South African, Botswanan and Romanian artifacts
2013
- Brain abscess. The experience of 30 years
2012
- Effect of bovine lactoferrin on the minimum inhibitory concentrations of ampicillin and trimethoprim-sulfamethoxazole for clinical Shigella spp. strains
2012
- Lead isotope analysis as a new method for identifying material culture belonging to the Vazquez de Coronado expedition
2012
- What is the impact of a rapid diagnostic E-test in the treatment of patients with Gram-negative bacteraemia?
2012
- Structural and tectonic evolution of the Acatlan Complex, southern Mexico: Its role in the collisional history of Laurentia and Gondwana
2012
- Enhanced precision, accuracy, efficiency, and spatial resolution of U-Pb ages by laser ablation-multicollector-inductively coupled plasma-mass spectrometry
2012
- The Landscape Evolution Observatory: A large-scale controllable infrastructure to study coupled Earth-surface processes
2011
- Small-volume U-Pb zircon geochronology by laser ablation-multicollector-ICP-MS
2011
- Origin and provenance of basement metasedimentary rocks from the Xolapa Complex: New constraints on the Chortis-southern Mexico connection
2011
- Multidrug and carbapenem-resistant Acinetobacter baumannii infections: Factors associated with mortality
2011
- Pre-operative anaemia: prevalence, consequences and approaches to management
2011
- Zinc Absorption from Fortified Milk Powder in Adolescent Girls
2010
- Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlan Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans
2010
- Small-volume baddeleyite (ZrO2) U-Pb geochronology and Lu-Hf isotope geochemistry by LA-ICP-MS. Techniques and applications
2010
- Prescribing patterns and economic costs of proton pump inhibitors in Colombia
2010
- Detrital zircon U/Pb geochronology of southern Guerrero and western Mixteca arc successions (southern Mexico): New insights for the tectonic evolution of southwestern North America during the late Mesozoic
2010
- The Putumayo Orogen of Amazonia and its implications for Rodinia reconstructions: New U-Pb geochronological insights into the Proterozoic tectonic evolution of northwestern South America
2010
- Some peculiarities of conventional pyrolysis of several agricultural residues in a packed bed reactor
2010
- U-Pb geochronology of granitoids in the north-western boundary of the Xolapa Terrane
2009
- U-Pb detrital zircon data of the Rio Fuerte Formation (NW Mexico): Its peri-Gondwanan provenance and exotic nature in relation to southwestern North America
2009
- Use of Cu isotopes to distinguish primary and secondary Cu mineralization in the Caariaco Norte porphyry copper deposit, Northern Peru
2009
- Low mortality rate in an outbreak of Legionnaires' disease: Correlation with the cytopathogenity study
2009
- U-Pb detrital zircon ages from the Aguapei Group (Brazil): Implications for the geological evolution of the SW border of the Amazonian Craton
2009
- Unraveling crustal growth and reworking processes in complex zircons from orogenic lower-crust: The Proterozoic Putumayo Orogen of Amazonia
2009
- U-Pb and Lu-Hf isotope systematics of lower crust from central-southern Mexico - Geodynamic significance of Oaxaquia in a Rodinia Realm
2008
- A comparative study of patients with methicillin susceptible versus methicillin resistant Staphylococcus aureus bacteremia: epidemiology and prognostic factors
2008
- Molybdenite Mineralization and Re-Os Geochronology of the Escondida and Escondida Norte Porphyry Deposits, Northern Chile
2008
- Steam Reforming of Bio-Oil Aqueous Fractions for Syngas Production and Energy
2008
- Effectiveness of Motivational Interviewing in improving lipid level in patients with dyslipidemia assisted by general practitioners: Dislip-EM study protocol
2008
- Nosocomial candidemia at a general hospital: The change of epidemiological and clinical characteristics. A comparative study of 2 cohorts (1993-1998 versus 2002-2005)
2008
- Re-Os AGE OF THE PUEBLO VIEJO EPITHERMAL DEPOSIT, DOMINICAN REPUBLIC
2007
- Pressure-temperature-time evolution of high-pressure rocks of the Acatlan Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans: Reply
2007
- When is coagulase-negative Staphylococcus bacteraemia clinically significant?
2007
- Carbapenem and multidrug-resistant Acinetobacter baumannii colonisation/infection: Epidemiology and factors associated with infection
2007
- Geologic origins of salinization in a semi-arid river: The role of sedimentary basin brines
2007
- U-Pb geochronology of granitoids in the north-western boundary of the Xolapa Terrane (vol 26, pg 189, 2009)
2007
- High precision isotopic analyses of lead ores from New Mexico by MC-ICP-MS: implications for tracing the production and exchange of Pueblo IV glaze-decorated pottery
2006
- Geology, stable isotope, and U-Pb geochronology of the Mariquita porphyry copper and Lucy Cu-Mo deposits, Cananea District, Mexico: A contribution to regional exploration
2005