Office Phone: 307-721-5082
Fax Phone: (307) 766-6679
P.O. Box 3006 Laramie, Wyoming 82071-3006
Office Room No: GE 221
Geophysics, PhD, Cambridge University, UK, 1989 Geophysics, MS, Cornell University, 1984 Geology, BA, Oxford University, UK, 1981
I have on-going projects to study:
* denotes student first author
Rioux, M., Cheadle, M.J., John, B.E., and Bowring, S.A., 2016, The temporal and spatial distribution of magmatism during lower crustal accretion at an ultraslow spreading ridge: High precision U-Pb zircon dating of ODP Holes 735B and 1105A, Atlantis Bank, Southwest Indian Ridge: EPSL. v 449, p. 395-406
*Grimes, C.B., Wooden, J.L., Cheadle, M.J., and John, B.E., 2015, “Fingerprinting” tectono-magmatic provenance using trace elements in igneous zircon: Contributions to Mineralogy and Petrology, v. 170, p. 45-70.
Rioux, M., Bowring, S.A., Cheadle, M.J., and John, B.E., 2015, Evidence for initial excess 231Pa in mid-ocean ridge zircons: Chemical Geology, v. 397, p. 143-156.
Gilles, K.M., Snow, J.E., Klaus, A., Abe, N., Adriao, A., Akizawa, N., Ceuleneer, G., Cheadle, M.J., Faak, K., Falloon, T., Friedman, S.A., Godard, M.M., Guerin, G., Harigane, Y., Horst, A.J., Hoshide, T., Ildefonse, B., Jean, M.M., John, B.E., Koepke, J.H., Machii, S., Maeda, J., Marks, N.E., McCaig, A.M., Meyer, R., Morris, A., Nozaka, T., Python, M., Saha, A., and Wintsch, R.P., 2014, Primitive Layered Gabbros from Fast-Spreading Lower Oceanic Crust: Nature, doi:10.1038/nature12778.
*Hansen L. N., M. J. Cheadle, B. E. John, S. M. Swapp, H. J. B. Dick, B. E. Tucholke, and M. A. Tivey, 2013, Mylonitic deformation at the Kane oceanic core complex: Implications for the rheological behavior of oceanic detachment faults: Geochem. Geophys. Geosyst., doi:10.1002/ggge.20184.
*Schoolmeesters, N., Cheadle, M.J., John, B.E., Reiners, P.W., Gee, J. and Grimes, C.B., 2012, The cooling history and the depth of detachment faulting at the Atlantis Massif oceanic core complex: Geochem. Geophys. Geosyst.G, doi:10.1029/2012GC004314 ,
Holness, M.B., Sides, R. Prior, D.J., Cheadle, M.J., & Upton, B. G. 2012 The peridotite plugs of Rum: crystal settling and fabric development in magma conduit, Lithos, Volumes 134–135, Pages 23-40 .
*Grimes, C. B., M. J. Cheadle, B. E. John, P. W. Reiners, and J. L. Wooden (2011), Cooling rates and the depth of detachment faulting at oceanic core complexes: Evidence from zircon Pb/U and (U-Th)/He ages, Geochem. Geophys. Geosyst., 12, Q0AG01, doi:10.1029/2010GC003391.
John, B.E., and Cheadle, M.J., 2010, Deformation and alteration associated with oceanic and continental detachment fault systems: are they similar?: in Rona, Devey, Dyment, and Murton, eds., Diversity of Hydrothermal Systems on Slow-spreading Ocean Ridges, AGU Monograph 188, p. 175-206.
Cheadle M.J. & Grimes, C.B., 2010. To Fault or Not to Fault, Nature Geosciences, News & Views, vol 3 454-456.
John, B.E., and Cheadle, M.J., 2010 Deformation and alteration associated with oceanic and continental detachment fault systems: are they similar?: in Rona, Devey, Dyment, and Murton, eds., Diversity of Hydrothermal Systems on Slow-spreading Ocean Ridges, AGU Monograph p 175-205.
*Schwartz, J.J., John, B.E., Cheadle, M.J., Wooden, J., Mazdab, F., Swapp, S, and Grimes, C.B., 2010, Dissolution-Reprecipitation of Igneous Zircon in Mid-Ocean Ridge Gabbro, Atlantis Bank, Southwest Indian Ridge: Chemical Geology, vol 274, p68-81.
Michael, P.J. & Cheadle, M.J., 2009, Making Crust. Science. (Perspectives) Vol. 323. no. 5917, pp. 1017 – 1018 DOI: 10.1126/science.1169556.
*Schwartz, J.J., John, B.E., Cheadle, M.J., Reiners, P., & Baines, A.G., The cooling history of Atlantis Bank oceanic core complex: evidence for hydrothermal activity 2.6 Myr off-axis. Geochemistry, Geophysics, Geosystems (G3), 2009.
*Baines, G., Cheadle, M.J., John, B.E., Grimes, C.B., and Wooden, J., Rapid accretion of gabbroic crust at Atlantis Bank on the ultra-slow-spreading SW Indian Ridge: EPSL, 2009 .
*Grimes, C.B., John, B.E., Cheadle, M.J., Mazdab, F.K., Wooden, J., Swapp, S., and Schwartz, J., On the occurrence, trace element geochemistry, and crystallization history of zircon from in situ ocean lithosphere: Contributions to Mineralogy and Petrology. 2009
*Baines, A.G., Cheadle, M.J., John, B.E., and Schwartz, J.J., 2008. Rate of detachment faulting at Atlantis Bank, South-west Indian Ridge: evidence for 100% asymmetry during the formation of oceanic core complexes. Earth and Planetary Science Letters, vol. 273, 105–114. doi:10.1016/j.epsl.2008.06.013.
*Grimes, C.B., John, B.E., Cheadle, M.J., and Wooden, J.L., 2008. Evolution and timescales for accretion of slow-spreading oceanic crust: constraints from high resolution U-Pb zircon dating of a gabbroic crustal section at Atlantis Massif, 30º N, MAR: Geochemistry, Geophysics, Geosystems, vol. 9, no. 8, Q08012, doi:10.1029/2008GC002063.
*Fletcher, R.; Kusznir, N.J., Cheadle, M.J., 2008 (in press). Melt initiation and mantle exhumation at the Iberian rifted margin: Comparison of pure-shear and upwelling-divergent flow models of continental breakup. (Geophysical Journal of the Royal Astronomical Society)
*Baines, A.G., Cheadle, M.J., Dick, H.J.B., Hosford-Scheirer, A., John, B.E., Kusznir, N.J., & Matsumoto. T., 2007,The evolution of the Southwest Induan Ridge and the implications of major changes in the ridge axis geometry since 25Ma. Geochemistry Geophysics Geosystems, vol. 8, doi:10.1029/2006GC001559.
*Grimes, C.B., John, B.E., Kelemen, P.B., Mazdab, F., Wooden, J., Cheadle, M.J.,Hanghoi, K., and Schwartz, J.J., 2007, The trace element chemistry of zircons from oceanic crust: A method for distinguishing detrital zircon provenance: Geology vol. 35, 643–646, doi:10.1130/G23603A.1.
Herzberg, C., Albarede, F., Arndt, N., Asimow, P.D., Lesher, M., Niu, Y., Fitton, J.G., Cheadle, M.J., and Saunders, A.D., 2007. Ultramafic Igneous Rocks: A Challenge for Alternatives to the Plume Hypothesis. Geochemistry Geophysics Geosystems. Volume 8, No. 2, Q02006, doi:10.1029/2006GC001390.
John, B.E., and Cheadle, M.J., 2007, Slow-spreading mid-ocean ridges: McGraw-Hill Yearbook of Science and Technology, Tenth Edition.
Schroeder, T., Cheadle, M.J., Dick, H.J.B., Faul, U., Casey, J.F., and Kelemen, P.B., 2007, Non-volcanic seafloor spreading and corner-flow rotation accommodated by extensional faulting at 15°N on the Mid-Atlantic Ridge: A structural synthesis of ODP Leg 209: Geochemistry Geophysics Geosystems, vol. 8, doi:10.1029/2006GC001567.
Holness, M., Cheadle, M.J., & McKenzie, D.P. 2005 On the use of changes in dihedral angle to decode late-stage textural evolution in cumulates. Journal of Petrology46: 1565-1583; doi:10.1093/petrology/egi026
Jackson, M.D, Gallagher, K. Petford, N. & Cheadle M.J., 2005 Towards a coupled physical and chemical model for tonalite–trondhjemite–granodiorite magma formation: Lithos vol. 79, 43-60.
*Schwartz, J.J., John, B.E., Cheadle, M.J., Miranda, E., Grimes, C., Wooden, J., and Dick, H. 2005. Growth and Construction of Oceanic Crust at Slow-Spreading Ridges, Science, vol 310, p654-658.
GEOL1070 - The Earth: Its Physical Environment
GEOL4835 – Applied/Exploration Geophysics
GEOL5217 – Geodynamics
GEOL 5200 – Ocean Tectonics
GEOL 5200 - Hollywood Science, Fact or Fiction?
GEOL 5200 – What’s New in Science & Nature?
I’m a process-oriented Geophysicist/Geologist who believes in a multi-disciplinary approach to solving problems in the Earth Sciences. My primary research aim is to better understand how the Earth’s crust grows and evolves. And to further this aim I study all aspects of magmatic processes from the micro- to the macroscopic scale, both on land and in the oceans. My philosophy is to combine fieldwork (both mapping & field geophysics) with laboratory based studies (geochemistry, microscopy, geochronology etc.) and with mathematical based studies whenever possible, and to go to the best possible location in the world to do this. As an example of this, my students and I have worked on projects ranging from the structural evolution of oceanic crust to mathematical modeling of the origin of granites, to the development of new techniques of textural analysis, to using reflection seismology to look at the sequence stratigraphy of layered intrusions, to doing modern geological field-work and petrologic and geochemical studies. And I’ve worked on mafic intrusions in Antarctica, Scotland, South Africa & North America; on granites in Ireland and France; on komatiites from Zimbabwe and Canada and on the oceanic crust in the Pacific, Indian and Atlantic Oceans and the Caribbean Sea.
Specific interests include:
I encourage my graduate students to follow my research philosophy; to tackle problems that require a multidisciplinary approach, and I hope they graduate having learned a broad range of skills that will serve them well in their future careers. If you want to learn more, please go to my personal webpage linked on this this page.