Dr. Walker's research interests are in integration of Tectonics, Geochronology, and GIS to better understand the geologic development of contractile and extensional systems. The main problems he is pursuing are 1) The development of contractile belts in a backarc setting. This research focuses on the interaction of plutons with faulting along the backarc margin of arcs. 2) Response of the lithosphere to extensional deformation. This work is multifaceted in that it approaches lithospheric deformation from a field point of view as well as using isotope geochemistry to better understand the coupling of crustal deformation with responses of mantle melting in the subcrustal lithosphere and mantle. 3) GIS techniques in geology. Dr Walker's research in this area spans the gamut from developing software/hardware combinations for geologic mapping on laptops in the field to regional database development to solve tectonic problems.
2012: National Science Foundation. “EarthCube Domain End-User Workshop for Structural Geology and Tectonics.” $50,000.
2012: ExxonMobil Upstream Research Company. "Detrital Zircon Geochronology Database Development." $35,000.
2011: Department of Energy/University of Texas, Austin. “Novel Coupled Thermochronometric and Geochemical Investigation of Blind Geothermal Resources in Fault- Controlled Dilational Corners, Dixie Valley, Nevada”. KU portion $68,899.
2011: National Science Foundation. “Collaborative Research: Chronology and Paleoecology of late Quaternary Proboscidean Extinctions in the Great Lakes Region (USA).” $75,500.
2010: Department of Energy. “Detachment Faulting and Geothermal Resources – An Innovative Integrated Geological and Geophysical Investigation in Fish Lake Valley, Nevada.” $~2,400,000. Co-PI with D. Stockli.
2010: National Science Foundation. Subaward under cooperative agreement for “Geoinformatics Facility Support: Integrated Data Collections for the Earth & Ocean Sciences: The Marine Geoscience Data System and the Geoinformatics for Geochemistry Program” made to K. Lehnert and S. Carbott at LDEO. KU portion ~$1,250,000 for 2010 to 2015.
Refereed Papers and Reports († indicates current or former advisee, * for invited):
Rittase†, W.M., Kirby, E., McDonald, E., Walker, J.D., Gosse, J., and Spencer, J., in press, Temporal variations in Holocene slip rate along the central 1 Garlock fault, Pilot Knob Valley, California: Lithosphere.
Gorynski†,K.E., Walker, J.D., and Stockli, D.F., 2014, Apatite (U-Th)/He thermochronometry as an innovative geothermal exploration tool: A case study from the southern Wassuk Range, Nevada: Journal of Volcanology and Geothermal Research.
Robertson, K., Simon, A., Pettke, T., Smith, E., Selyangin, O., Kiryukhin, A., Mulcahy, S.R., and Walker, J.D., 2013, Melt inclusion evidence for magma evolution at Mutnovsky volcano, Kamchatka: Geofluids, doi: 10.1111/gfl.12060.
Gorynski†,K.E., Stockli, D.F., and Walker, J.D., 2013, Thermochronometrically constrained anatomy and evolution of a Miocene extensional accommodation zone and tilt domain boundary: the southern Wassuk Range, Nevada: Tectonics, v. 32, p. 516-539, doi: 10.1002/tect.20044.
Riggs, N.R., Reynolds, S.J., Lindner, P.J., Howell, E.R., Barth, A.P., Parker, W.G., and Walker, J.D., 2013, The Early Mesozoic Cordilleran arc and Late Triassic paleotopography: The detrital record in Upper Triassic sedimentary successions on and off the Colorado Plateau: Geosphere, v. 9, p. 602-613, doi:10.1130/GES00860.1.
*Walker, J.D., Geissman, J.W., Bowring, S.A., and Babcock, L.E., 2013, The Geological Society of America Geologic Time Scale: Geological Society of America Bulletin, v. 125, p. 259-272.
Riggs, N., Barth, A, Gonzalez-Leon, C., Jacobson, C., Wooden, J., Howell, E., Walker, J.D., 2012, Provenance of Upper Triassic strata in southwestern North America as suggested by isotopic analysis and chemistry of zircon crystals: Geological Society of America, Special Paper 487, p. 13–36, doi:10.1130/2012.2487(02).
Walker, J.D.,Geissman, J.W., Bowring, S.A., and Babcock, L.E., 2012, Geologic Time Scale v. 4.0: Geological Society of America, doi: 10.1130/2012.CTS004R3C
Barth, A.P., Feilen, A.D.G., Yager, S.L., Douglas, S.R., Wooden, J.L., Riggs, N.R., and Walker, J.D., 2012, Petrogenetic connections between ash-flow tuffs and a granodioritic to granitic intrusive suite in the Sierra Nevada arc, California: Geosphere; doi: 10.1130/GES00737.1.
Barth, A.P., Walker, J.D., Wooden, J.L., Riggs, N.R., and Schweickert, R.A., 2011, Birth of the Sierra Nevada magmatic arc: Geosphere, v. 7; no. 4; p. 877–897; doi: 10.1130/GES00661.1.
Widga, C., Walker, J.D., and Stockli, L.D., 2010, Bison Diet and Mobility in the Great Plains during the Middle Holocene: 87Sr/86Sr, d13C, and d18O Analyses: Quaternary Research, v. 73, p. 449-463.
Andrew†, J.A., and Walker, J.D., 2009, Reconstructing Cenozoic deformation in the Panamint Valley region, eastern California, with implications for timing and magnitude of faulting in parts of the Central Basin and Range: Geosphere, v. 5, p. 172-198.
Khan, S.D., Walker, J.D., Hall, S.A.., Burke, K.C., Shah, M.T, and Stockli, L., 2009, Did the Kohistan-Ladakh Island Arc collide first with India?: Geological Society of America Bulletin, v. 121: 366 - 384.