Gray E. Bebout, Professor, Lehigh University
Metamorphic Geochemistry and Biogeochemical Cycling
Spring, 2014

 ISEI Guesthouse

  Guesthouse, Institute for Study of the Earth's Interior (Okayama University, Misasa, Japan)

Contact Information:
Gray E. Bebout, Professor
Department of Earth and Environmental Sciences
1 West Packer Avenue
Lehigh University
Bethlehem, Pennsylvania 18015-3001 USA
Office: 610-758-5831
Laboratory: 610-758-6168
Abbreviated CV, G. Bebout

October issue of ELEMENTS on "Nitrogen and its (biogeocosmo)chemical cycling"
(editors G. E. Bebout, M. L. Fogel, and P. Cartigny; see the cover of the issue here)

New review papers on subduction zone chemical/isotopic cycling and metasomatism:

Bebout, G. E., 2012, Ch. 9. Metasomatism in subduction zones of oceanic slabs, mantle wedges, and the slab-
    mantle interface, in D. Harlov, and H. Austrheim, editors, Metasomatism and Metamorphism: The Role of
    Fluids in Crustal and Upper Mantle Processes, Springer, Lecture Notes in Earth Sciences,
    ISBN: 978-3-642-28393-2.

Bebout, G. E., 2013, 4.20. Chemical and Isotopic Cycling in Subduction Zones, in Rudnick, R. L., ed.,
    The Crust, Treatise on Geochemistry (eds. H. D. Holland and K. K. Turekian, Second Edition),
    Elsevier-Pergamon, Oxford.

Recent Research at Lehigh University
(Stable Isotope Laboratory):

Nitrogen Isotope (GeoBio)chemistry:
    - analytical methods (experimentation with carrier gas methods; Bebout et al., 2007, Chemical Geology)
    - incorporation of N during microbial chemical alteration of seafloor basalts (collaborative with Neil Banerjee and
        Matthew Izawa, Western Ontario University, presented at LPSC, 2011, and AbSciCon, 2012)
- preservation of N biogeochemical signatures in ancient sedimentary and metasedimentary rocks (collaborative
        with Linda Godfrey, Rutgers University; paper in Geology, 2013)
    - records of deep N subduction in HP and UHP metabasaltic suites (collaborative with Ralf Halama, Universität
        Potsdam; Timm John, Freie Universität Berlin, see paper in GCA, 2010; Nathan Collins, Lehigh Ph.D. student)
- N subduction in ultramafic rocks (collaborative with Ralf Halama, Universität Kiel; Timm John, Universität
        Münster; Marco Scambelluri, Università di Genova; Horst Marschall, WHOI, paper in International Journal
        of Earth Sciences, 2012)
    - N behavior during partial melting (collaborative with Ian Buick, Stellenbosch University; Annie Palya, now at                       
        Florida International University, paper in Chemical Geology, 2010)
- storage of N in microporous phases (collaborative with Charles Geiger, Universität Salzburg; Kris Lazzeri, working
        in environmental consulting)


Lithium isotope behavior in subduction zones, Catalina Schist, California (collaborative with Sarah Penniston-Dorland,
    Univ. Maryland; Philip Pogge von Strandmann and Tim Elliott, Bristol University (paper in EPSL, 2011)

Carbon cycling in subduction zones, with work based in the Italian/French Alps and Tianshan, China (collaborative with
    P. Agard, Université Pierre et Marie Curie-Paris 6; Marco Scambellluri, Università di Genova; T. John, Universität
    Münster; Roberto Braga, Università di Bologna; Fall AGU abstracts, 2010, 2012; manuscripts in prep.; Jennie Cook-  
    Kollars, former Lehigh University M.S. student, Nathan Collins, Lehigh University Ph.D. student)

Fluid-rock interactions and fluid mobility in the Appalachian Valley and Ridge, West Virginia (with Mark Evans,
    Central Connecticut State University; paper in Tectonophysics, 2012)

Lithium isotope geospeedometry of subduction zone fluid-rock interactions, Tianshan, China (with Timm John,
Universität Münster, and others; paper in Nature Geoscience, 2012)

Use of lake sediment O, C, and N isotopes in paleoclimate reconstruction, New Jersey and Alaska, with Zicheng Yu,
    Lehigh University, and Long Li, now at University of Alberta (paper in GCA, 2008)

Tree-ring C isotope records of anthropogenic impacts on temperate forests, Pennsylvania and New Jersey
    (collaborative with Long Li, Univ. Alberta, Zicheng Yu, Lehigh University; paper in Chem. Geol., 2010)

Sensitivity of global carbonate-silicate models of atmospheric carbon dioxide to changes in subduction input
    [collaborative with Lee Kump, Penn. State University]

Sunda-Java-Timor Forearc-Trench-Arc 

We analyzed C-N concentrations and isotopic compositions of sediment [and altered seafloor basalt] recovered
on ODP Legs 185 and 205 [see Sadofsky and Bebout, 2004,
G-cubed; Li and Bebout, 2005, JGR and ODP Leg 205
Scientific Results
), with the goals of characterizing organic sources and diagenetic history and subduction input
fluxes in the Izu-Bonin-Mariana and Central American convergent margins.
More recently, we are working on
sediment C-N inputs into the Sunda-Java margin.
Locations for DSDP/ODP Sites 211, 261, 262, and 765 are
shown on the seafloor topographic map
above (image above is from Smith and Sandwell Global Seafloor Topo-
graphy, NOAA and Scripps Institution of

Recent/Ongoing Research Based in Misasa, Japan (Pheasant Memorial Laboratory, ISEI):

Boron Isotope Ion Microprobe Data for Catalina Schist and Alps UHP Metasedimentary Tourmalines
    [Bebout and Nakamura, Geology, 2003; Bebout et al., Chemical Geology, 2013]

Major and Trace Element and Isotopic Compositions of Subduction Zone melange units

    - amphibolite-grade melange in Catalina Schist (Bebout and Barton, 2002, Chemical Geology)
    - lawsonite-albite and lawsonite-blueschist grade (King et al., 2006, EPSL; King et al., 2007, Chemical Geology)

Subduction-Zone Devolatilization (Italian Alps, Turkey; with Eizo Nakamura, Takuya Moriguti, Katsura Kobayashi
     ISEI; Philippe Agard, Université Pierre et Marie Curie-Paris 6)

    - major/trace element geochemistry, SIMS work on HP/UHP eclogites (King et al., 2004, G-cubed)
    - Schistes Lustres, W. Alps, devolatilization (Bebout, Agard, Kobayashi, Moriguti, Nakamura, 2013,
         Chemical Geology, 2013)

Stable Isotope Zoning in HP and UHP Metamorphic Porphyroblasts (collaborative with Takuya Moriguti, Tatsuki
    Tsujimori, Tak Kunihiro, Tsutomu Ota, Katsura Kobayashi, Eizo Nakamura, and Bill Carlson)

ISEI (Institute for Study of the Earth's Interior, Misasa, Japan)

Courses Taught:

EES 15 Volcanoes and the Ring of Fire
EES 90 recently "
Volcanoes and the Ring of Fire" or "Space, The Final Frontier" (odd-year fall)
EES 131 Introduction to Rocks and Minerals (every spring)
EES 334 Geosphere Structure and Evolution (odd-year fall)
EES 438 Petrogenetic Processes (graduate level; even-year spring)
EES 471 Stable Isotope Chemistry: Theory, Techniques, and Applications in the Earth and Environmental Sciences
    (graduate level; even-year fall)

EES 293 Undergraduate Internships
EES 393 Undergraduate Research


page last updated 4-14-14