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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.

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Courses
  • PG
    Petrology of Gems

  • IG
    Introduction to Geochemistry

Grants
  • Funding agency logo
    Controlled Environment Agriculture Indoor and Vertical Food Projection Coordinated Research Conference

    Co-Investigator (COI)

    2019

    $50.0K
  • Funding agency logo
    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
  • Funding agency logo
    Rare Earth Elements Tracing Crustal Evolution Through Time: A Detrital Zircon Study

    Co-Investigator (COI)

    2017

    $212.6K
  • Funding agency logo
    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
  • Funding agency logo
    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
  • Funding agency logo
    Facility Support: Multi-User Facility Support for the U-TH-PB Geochrono Logy & Complementary Geochemistry ... AZ Laserchron Center

    Co-Investigator (COI)

    2011

    $809.7K
  • Funding agency logo
    UA Guinea Offshore Seismic and Tectonic Analysis, Phase II

    Co-Investigator (COI)

    2011

    $510.0K
  • Funding agency logo
    CPATH-2: Computational Thinking as a Foundation for Interdisciplinary Undergraduate Education

    Co-Investigator (COI)

    2009

    $800.0K
  • Funding agency logo
    Developing Heavy Stable Isotopes for Provenance of Turquoise, Metals and Glass

    Co-Investigator (COI)

    2009

    $269.7K
  • Funding agency logo
    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

  • 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

  • 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

  • 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

  • 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

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