Publications

PAPERS IN PEER REVIEWED JOURNALS

 

Marine Geology & Geophysics

Karson, J.A. Oceanic transform faults, in D. Alderton and Elias, S.A. eds., Encyclopedia of Geology, 2nd edition, vol. 3, 930-946, Academic Press (UK), dx.doi.org/10.1016/B978-0-12-409548-9.12490-X, 2021.

Worman, S.L., L.P. Pratson, J.A. Karson, W.H. Schlesinger, Abiotic hydrogen (H2) sources and sinks near the Mid-Ocean Ridge (MOR) with implications for the subseafloor biosphere Proc. Nat. Acad. Sci., https://doi.org/10.1073/pnas.2002619117, 2020.

Brown, T.C, M.J. Cheadle, B.E. John, L.A. Coogan, J.S. Gee, J.A. Karson and  S.M. Swapp, Textural character of gabbroic rocks from Pito Deep: A record of magmatic processes and the genesis of upper plutonic crust at fast-spreading mid-ocean ridges, J. Petrol.,60, 5, 997-1026, doi: 10.1093/petrology/egz022, 2019.

Karson, J.A., From ophiolites to oceanic crust: Sheeted dike complexes and seafloor spreading, in Srivastiva, R.K., R.E. Ernst and P. Peng, eds., Dyke Swarms of the World: A Modern Perspective, pp.459-492, Springer Geology, Singapore, https://doi.org/10.1007/978-981-13-1666-1_13, 2019.

Szitkar, F., Tivey, M.A., Kelley, D.S., Karson, J.A., Früh-Green, G.L., and Denny, A., Magnetic exploration of a low-temperature ultramafic-hosted hydrothermal site (Lost City, 30°N, MAR), Earth Planet Sci. Lett., 461, 40-45, 2017.

Worman, S.L., Pratson, L.F., Karson, J.A. and Klein, E.M., Global rate and distribution of H2 gas produced by serpentinization within oceanic lithosphere, Geophys. Res. Lett., 43, 12, 6435-6443, doi;10.1002/2016GL06906612, 2016.

Horst, A. J., R. J. Varga, J. S. Gee, J. A. Karson, Diverse magma flow directions during construction of sheeted dike complexes at fast- to superfast-spreading centers, Earth Planet Sci. Let., 408, 119-131, 2014.

Karson, J.A., K.L.C. Bell, A.F. Nanfito, D. Joyce, M. Cunha, J. Cristobo and E. Manhon, In search of serpentinization on Gorringe Bank, in Bell, K.L.C., K. Elliot, C. Martinez and S.A. Fuller, eds., New Frontiers in Ocean Exploration: The E/V Nautilus and NOAA Ship Okeanos Explorer 2011 Field Season, Oceanography, 25 (1), supplement, 38-39, 2012.

Horst, A.J., R.J. Varga, J. Gee and J. Karson, Paleomagnetic constraints on constructional deformation of superfast-spread oceanic crust exposed at Pito Deep Rift, J. Geophys. Res., 116, B12103, doi:10.1029/2011JB008268, 2011.

Christeson, G.L., J.A. Karson, and K.D. McIntosh, Mapping of seismic layer 2A/2B boundary above the sheeted dike unit at intermediate-spreading crust exposed near the Blanco Transform, Geochemistry, Geophysics, Geosystems (G-Cubed), 11, Q03015, doi: 10.1029/2009GC002864, 2010.

Hayman, N.W. and J.A. Karson, Faulting and hydrothermal alteration in superfast spread crust of the East Pacific Rise exposed at Pito Deep, G-cubed 10, Q02013, doi:10.1029/2008GC002319, 2009.

Pollock, M.A., E.M. Klein, J.A. Karson and D.S. Coleman, Compositions of dikes and lavas from the Pito Deep Rift: Implications for accretion at superfast spreading centers, Journal of Geophysical Research 114, B03207, doi:10.1029/2007JB005436, 2009.

Heft, K., K.M. Gillis, M.A. Pollock, J.A. Karson, E.M. Klein, Constraints on the nature of axial hydrothermal systems from the sheeted dike complex exposed at Pito Deep, G- Cubed 9 (5), Q05O07, doi:10.1029/2007GC001926, 2008.

Varga, R.G., A. Horst, J.S. Gee and J.A. Karson, Direct evidence from anisotropy of magnetic susceptibility for lateral melt migration a superfast spreading centers, G-Cubed 9 (8), Q08008, doi:10.1029/2008GC002075, 2008.

Christeson, G.L., K.D. McIntosh and J.A. Karson, Inconsistent correlation of seismic layer 2a and lava layer thickness in oceanic crust, Nature 445, doi:10.1038/nature05517, 2007.

Hayman, N.W. and J.A. Karson, Faults and damage zones in fast-spread crust exposed on the north wall of the Hess Deep Rift: Conduits and seals in seafloor hydrothermal systems, G-Cubed, 8, 10, Q10002, doi:10.1029/2007GC001623, 2007.

Kelley, D.S., G.L. Früh-Green, J.A. Karson, and K.A. Ludwig, Lost City hydrothermal field revisited, Oceanography 20, 4, 90-99, 2007.

Perk, N.W., L.A. Coogan, J.A. Karson, J.A., E.M. Klein, and H.D. Hanna, The primitive lower oceanic crust from Pito Deep: Implications for the accretion of the lower crust at the southern east Pacific Rise, Contributions to Mineralogy and Petrology, doi:10.1007/ s00410-007-0210-z, 2007.

Boschi, C., G.L Früh-Green, A.G. Delacour, D.S. Kelley, and J.A. Karson, Mass transfer and fluid flow during detachment faulting and development of an oceanic core complex, Atlantis Massif (MAR 30°N), G-cubed 7(1), doi:10.1029/2005GC001074, 2006.

Karson, J.A., G.L. Früh-Green, D.S. Kelley, E.A. Williams, D.R. Yoerger, and M. Jakuba, Detachment shear zone on the Atlantis Massif Core Complex, Mid-Atlantic Ridge 30°N, G-Cubed 7 (6), doi:10.1029/2005GC001109, 2006.

Stewart, M.A., J.A. Karson and E.M. Klein, Four-dimensional upper crustal construction at fast-spreading mid-ocean ridges: A perspective from an upper crustal cross-section at the Hess Deep Rift, J. Volcanology Geothermal Res. 144, 287-309, 2005.

Kelley, D.S., J.A. Karson, G.L. Früh-Green, D.R. Yoerger, T.M. Shank, D.A. Butterfield, J.M. Hayes, M.O. Schrenk, E. Olson, G. Proskurowski, M. Jakuba, A. Bradley, B. Larson, K. Ludwig, D. Glickson, K. Buckman, A.S. Bradley, B. Brazelton, K. Roe, M.J. Eland, A. Delacour, S.M. Bernasconi, M.D. Lilley, J.A. Baross, R.E. Summons, and S.P. Sylva, Geological, biological, and hydrothermal processes at the Lost City Vent Field: A serpentinites-hosted ecosystem: The Lost City Hydrothermal Field, Science 307, 1428-1434, 2005.

Pollock, M.A., E.M. Klein, J.A.  Karson, and M. A. Tivey, Temporal and spatial variability in the composition of lavas exposed along the Western Blanco Transform Fault, G-cubed 6 (11), doi:10.1029/2005GC001026, 2005.

Hurst, S.D. and J.A. Karson, Side-scan processing and interpretation along the northern wall of the Hess Deep Rift: Texture analysis and geologic ground-truth, J. Geophys. Res. 109 (B02107, doi:10.1029/2002JB002116, 2004.

Varga, R.G., J.A. Karson and J.S. Gee, Paleomagnetic constraints on deformation models for oceanic crust exposed at the Hess Deep Rift: Implications for axial processes at the East Pacific Rise, J. Geophys. Res. 109 (B2102), doi:10.1029/2003JB002486, 2004.

Früh-Green, G.L., D.S. Kelley, S.M. Bernasconi, J.A. Karson, C. Boschi, K.A. Ludwig, D.A. Butterfield, 30,000 Years of Hydrothermal Activity at the Lost City Hydrothermal Field, Science 301, 495-498, 2003.

Karson, J.A. and G.L. Christeson, Comparison of geologic and seismic structure of uppermost fast-spread oceanic crust: Insights from a crustal cross section at the Hess Deep Rift, in Small-Scale Crustal Heterogeneity: Nature, Scaling, and Seismic Properties, edited by J.A. Goff and K. Holliger, Kluwer/Plenum Publishing, NY, 99-129, 2003.

Stewart, M.A., E.M. Klein, J.A. Karson and J.G. Brophy, Geochemical relationships between dikes and lavas at the Hess Deep Rift: Implications for magma eruptibility, J. Geophys. Res,, 108(B4), 2184, doi:10.1029/2001JB001622, 2003.

Blackman, D.K., J.A. Karson, D.S. Kelley, J.R. Cann, G. L. Früh-Green, J.S. Gee, S.D. Hurst, B.E. John, J. Morgan, S.L. Nooner, D.K. Ross, T.J. Schroeder and E.A. Williams, Geology of the Atlantis Massif (Mid-Atlantic Ridge, 30°N): Implications for the evolution of an ultramafic oceanic core complex, Mar. Geophys. Res. 23, 443-469, 2002.

Karson, J.A., Geologic structure of the uppermost oceanic crust created at fast- to intermediate-rate spreading centers, Ann. Rev. Earth Planet. Sci., 30, 347-384, 2002.

Karson, J.A., E.M. Klein, S.D. Hurst, C.E. Lee, P.A. Rivizzigno, D. Curewitz, A.R. Morris, and Hess Deep ‘99 Scientific Party, Structure of uppermost fast-spread oceanic crust exposed at the Hess Deep Rift: Implications for subaxial processes at the East Pacific Rise, Geochemistry, Geophysics, Geosystems (G-Cubed), 3, doi:10.1029/2001GC000155], 2002.

Karson, J.A., M.A. Tivey, and J.R. Delaney, Internal structure of uppermost oceanic crust along the western Blanco Transform Scarp: Implications for subaxial accretion and deformation at the Juan de Fuca Ridge, J. Geophys. Res., 107(B9), 2181, doi:10.1029/2000JB000051, 2002.

Lawrence, R.M., J.S. Gee, and J.A. Karson, Magnetic anisotropy of serpentinized peridotites from the MARK Area: Implications for the orientation of mesoscopic structures and major fault zones, J. Geophys. Res., 107(B4), 2073, doi:10.1029/2000JB000007, 2002

Stewart, M.A., E.M. Klein and J.A. Karson, The geochemistry of dikes and lavas from the north wall of the Hess Deep Rift: Insights into the four-dimensional character of crustal construction at fast-spreading mid-ocean ridges, J. Geophys. Res., 107, doi 10, 1029/2001JB000545, 2002.

Gillis, K.M., K. Muehlenbachs, M. Stewart, T. Gleeson, and J.A. Karson, Fluid flow patterns in fast-spreading East Pacific Rise crust exposed at Hess Deep, J. Geophys. Res., 106, 26,311-26,329, 2001.

Karson, J.A., Oceanic crust when Earth was young, Science, 292, 1076-7, 2001.

Kelley, D.S., J.A. Karson, D.K. Blackman, G.L. Früh-Green, D.A. Butterfield, M.D. Lilley, E.J. Olson, M.O. Schrenk, K.K. Roe, G.T. Lebon, P.A. Rivizzigno and the AT3-60 Shipboard Party, An off-axis hydrothermal vent field near the Mid-Atlantic Ridge at 30° N, Nature, 412, 145-149, 2001.

 

Iceland

 Karson, J.A., B. Brandsdóttir, P. Einarsson, K. Sæmundsson, J.A. Farrell and  A.J. Horst, Evolution of migrating transform faults in anisotropic oceanic crust: Examples from Iceland, Can. J.  Earth Sci.,56, 1297-1326, doi:10.1139/cjes-2018-0260, 2019.

Horst, A.J., J.A. Karson and R.J. Varga, Large rotations of crustal blocks in the Tjörnes Fracture Zone of northern Iceland, Tectonics, 37, doi:10.1002/2016TC004371, 2018.

Karson, J.A., J.A. Farrell, L.A. Chutas, A.F Nanfito, J.A. Proett, K.T. Runnals and K. Sæmundsson, Rift-parallel strike-slip faulting near the Iceland plate boundary zone: Implications for propagating rifts, Tectonics, 37, doi:10.1029/2018TC005206, 2018.

Voight, B., A. Clifton, A. Hjartarson, B. Steingrimsson, B. Brandsdóttir, F. Sigmundsson, G.Ó. Friðleifsson, G. Larsen, G. Jonsdottir, H. Noll, I. McDougall, I. Kaldal, I. Fridleifsson, J. Aronson, J. Karson, K. Gronvold, K. Young, L. Kristjansson, M. Sigurgeirsson, M.T. Gudmundsson, M. Jancin, O. Flovenz, P. Einarsson, R. Williams, S. Palmadóttir and W. L. Friedrich, A half-century of geologic and geothermic investigations in Iceland: The legacy of Kristján Sæmundsson, J. Volc. Geoth. Res., https://doi.org/10.1016/j.jvolgeores.2018.08.012, 2018.

Karson, J.A., Propagating rifts, migrating transform faults, and rift-parallel strike-slip faults in Iceland, Geochemistry, Geophysics, Geosystems (G-cubed), 18, 4043–4054, doi: 10.1002/2017GC007045, 2017.

Siler, D.L. and J.A. Karson, Segment-scale crustal accretion processes in Iceland, Tectonics, 36, doi:10.1002/2017TC004629, 2017.

Karson, J.A., Propagating rifts, migrating transform faults, and microplate tectonics in Iceland, Nature Geoscience, in preparation, 2017.

Karson, J.A., J.A. Farrell, L.A. Chutas, A.F Nanfito, J.A. Proett, K.T. Runnals and K. Sæmundsson, Widespread rift-parallel strike-slip faulting in Iceland, Tectonics, in preparation, 2017.>

Siler, D.L. and J.A. Karson, Segment-scale crustal accretion processes in Iceland, Tectonics, in review, 2017.

Horst, A.J., Varga, R.J., Gee, J.S., and Karson, J.A., A broken bookshelf mechanism to accommodate large rotations of crustal blocks in the Tjörnes Fracture Zone of northern Iceland, Tectonics, in press, 2017.

Karson, J. A., Crustal accretion of thick, mafic crust in Iceland: Implications for volcanic rifted margins, Can. J. Earth Sci., 53, 1-11, doi:doi.org/10.1139/cjes-2016-0039, 2016.

Siler, D.L. and J.A. Karson, Focused subsidence during Tertiary crustal construction in the magmatic rift zones of Iceland: Structure and stratigraphy of the Vatnsdalur Flexural Basin, Geol. Soc. Amer. Bull., 124, doi:10.1130/B30562.1, 2012.

Siler, D.L. and J.A. Karson, Three-dimensional structure of inclined sheet swarms: Implications for crustal thickening and subsidence in the volcanic rift zones of Iceland, J. Volcanology Geothermal Res., 188, 333–346, 2009.

Sæmundsson, K. and J. A. Karson, Stratigraphy and tectonics of the Húsavík-Western Tjörnes area, Unpublished Report, prepared for Alcoa and HRV Engineering, ÍSOR-2006/-32, 35 pp. and 1:20,000 Geological Map, 2006.

 

Lava Project

Farrell, J.A., C.W. Hamilton, J.A. Karson and R.J. Wysocki, Predicting the locations of breakouts in basaltic lava flow experiments, Geology, in review, 2021.

Soldati, A., J.A. Farrell, R.J. Wysocki and J.A. Karson, Ferrovolcanic flows: Insights on emplacement dynamics from large-scale experiments, Nature Communications, doi: 10.1038/s41467-021-21582-w, 2021.

Soldati, A., C.J. Sant, J.A. Farrell, R.J. Wysocki and J.A. Karson, The effect of bubble  on the rheology of lava flows: Insights from large-scale two-phase experiments, Earth Planet. Sci. Lett., 548, https://doi.org/10.1016/j.epsl.2020, 2020.

Farrell, J.A., Karson, J.A., Soldati, A. and Wysocki, R.J., Multiple-generation surface folding and non-coaxial strain of lava crusts, Bull. Volc., 80,84, https://doi.org/10.1007/s00445-018-1258-5, 2018.

Karson, J. A. and R.W. Hazlett, Constraining processes in natural and experimental basaltic lava flows, in Varga, R.J. ed., Proceedings of the Twenty-Ninth Annual Keck Research Symposium in Geology, 29, 5 pp., 2016.

Karson, J. A. and R.W. Hazlett, Calibrating natural basaltic lava flows with large-scale experiments, in Varga, R.J. ed., Proceedings of the Twenty-Eighth Annual Keck Research Symposium in Geology, 28, 6 pp., 2015.

Edwards, B.R., J.A. Karson, R.J. Wysocki, E. Lev, I. Bindemen and U. Kueppers, Insights on lava-ice/snow interactions from large-scale basaltic melt experiments, Geology, doi:10.1130/G34305.1, 2013.

Karson, J.A. and R.J. Wysocki, Do-it-Yourself Lava Flows: Science, art, and education in the Syracuse University Lava Project, EARTH, 57, 9, 38-45, 2012.

Lev, E., M. Spiegelman, R.J. Wysocki, and J.A. Karson, Investigating lava flow rheology using video analysis and numerical flow models, J. Volcanology Geothermal Res., 247-248, 62-73, http://dx.doi.org/10.1016/j.jvolgeores.2012.08.002, 2012.

 

Rivizzigno, P.A. and J.A. Karson, Mid-ocean ridge fault zones preserved on Macquarie Island: Faulting, hydrothermal processes and magmatism in an oblique-spreading environment, Geology 32, 125-128, 2004.

Alt, J.C., G. Davidson, D.A.H. Teagle and J.A. Karson, The isotopic composition of gypsum in the Macquarie Island Ophiolite: Implications for sulfur cycle and the subsurface biosphere in oceanic crust, Geology, 31, 549-552, 2003.

Hefferan, K.P., H. Admou, Hilal, R., J.A. Karson, S. Samson, A. Saquaque, and J.M. Kornprobst, Proterozoic blueschist-bearing mélange in the Anti-Atlas Mountains, Morocco, Precambrian Research, 118, 179-194, 2002.

Hefferan, K.P., H. Admou, J.A. Karson and A. Saquaque, Anti-Atlas (Morocco) role in Neoproterozoic Western Gondwana reconstruction, Precambrian Res., 103, 89-96, 2000.

 

ABSTRACTS OF PRESENTATIONS AT SCIENTIFIC MEETINGS

2005

Karson, J.A., Transtension at oceanic ridge-transform intersections, (Invited Keynote Presentation), Tectonics of Restraining Bends and Releasing Bends in Continental and Oceanic Settings, Geological Society of London, September, 2005.

Hayman, N. and J.A. Karson, Mid-ocean ridge axial faulting and fluid flow in the upper oceanic crust, Geological Society of America, Annual Meeting (Salt Lake City), Abstracts with Programs 37, 2005.

Varga, R.J. and J.A. Karson, Geologic and Paleomagnetic evidence for spreading-related magmatism, faulting and crustal flexure in the Skagi Area, northern Iceland, Geological Society of America, Annual Meeting (Salt Lake City), Abstracts with Programs 37, 2005.

Karson, J.A., Cross sections of the upper oceanic crust in tectonic windows: Implications for sub-axial processes at fast- to intermediate-spreading centers, RIDGE 2000 Meeting, Vancouver, BC, October 2005.

Boschi, C., G.L. Früh-Green, J.A. Karson, and D.S. Kelley, Mass transfer and fluid flow during detachment faulting and development of an oceanic core complex, Atlantis Massif, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Früh-Green, G.L., C. Boschi, D.S. Kelley, A. Delacour, S.M. Bernasconi, and J.A. Karson, Insights into peridotite-hosted hydrothermal systems from petrological and geochemical studies of the Lost City Hydrothermal System, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Hayman, N.W., K.M. Gillis, J.A. Karson and Pito Deep 2005 Science Party, Faulting and focused fluid flow in superfast EPR crust near Pito Deep, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Heft, K., K. Gillis, and Pito Deep 2005 Science Party, Fluid flow and hydrothermal alteration patterns in sheeted dikes at Pito Deep, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Hey, R.N., J.S. Gee and Pito Deep 2005 Science Party, Alvin magnetometer investigations of Pito Deep, Easter Microplate, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Hurst, S.D., M. Kolak, M. Bowles and Pito Deep 2005 Science Party, Digital image mosaics of the oceanic crust exposed at the Pito Deep: Mesoscopic perspectives on structure and deformation, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Karson, J.A., Internal structure of the upper oceanic crust generated at fast to intermediate rates: The view from tectonic windows in the Pacific, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement, 2005.

Kelley, D. and the 2003/2005 Science Teams, Serpentinization and life, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Klein, E.M., M.A. Pollock, J.A. Karson and Pito Deep 2005 Science Party, Geochemistry of dikes and lavas recovered from ‘tectonic windows’ into the upper ocean crust, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Morgan, L.A., J.A. Karson, N.W. Hayman, R.J. Varga, S.D. Hurst and Pito Deep 2005 Science Party, Internal structure of basaltic lavas and sheeted dikes in 3 Ma super-fast EPR crust exposed at Pito Deep, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Naar, D.F., R.N. Hey, J.S. Gee, R. Hékinian, J. Francheteau, J.A. Karson, E.M. Klein, K.M. Gillis, R.J. Varga and Pito Deep 2005 Science Party, DSL120 mosaics of superfast EPR crustal layers exposed by ultraslow seafloor spreading near Pito Deep, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Perk, N., L. Coogan and Pito Deep 2005 Science Party, Primitive cumulates in the upper-plutonics from the East Pacific Rise, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Pollock, M.A., E.M. Klein, J.A. Karson and Pito Deep 2005 Science Party, Geochemical variability of dikes and lavas exposed in the Pito Deep, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

Varga, R.J., J.A. Karson, J. Francheteau, J.S. Gee, K.M. Gillis, R. Hékinian, R.N. Hey, E.M. Klein, D.F. Naar and Pito Deep 2005 Science Party, Alvin, Jason II, DSL-120 investigation of super-fast EPR crust exposed at the Pito Deep Rift, Easter Microplate, SE Pacific, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 86, 2005.

2006

Karson, J.A., Ophiolites on the Seafloor: Diverse Crustal Structures Reflecting Variations in Accretionary Processes (Invited), Geol. Assn. Can./Min. Assn. Can, Annual Meeting, Montreal, Canada, May 2006.

Karson, J.A., Diversity of oceanic crust and implications for accretion at mid-ocean ridges (Invited Keynote Lecture), German Min. Soc. (DMG) Meeting, Hannover, Germany, September 2006.

Karson, J.A., Crustal accretion in Iceland and at mid-ocean ridge spreading centers, I.A.V.C.E, G.P.L. Walker Symposium on Advances in Volcanology, Reykholt, Iceland, June 2006.

Hayman, N.W. and J.A. Karson, Fault-controlled fluid-flow regimes along the East Pacific Rise (EPR): Geological views through tectonic windows, Geological Society of America, Annual Meeting (Philadelphia), Abstracts with Programs 38, 7, 2006.

Pollock, M.A., E.M. Klein, J.A. Karson, N W Hayman, Geochemistry of dikes and lavas in ocean crust: Implications for dike intrusion and eruption at fast to superfast spreading centers, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 87, T41B-1571, 2006.

Chutas, L.A., J.A. Karson, K. Sæmundsson, Rift-parallel strike-slip faulting in the Karahnjukar area of eastern Iceland, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 87, T43D-1687, 2006.

Horst, A., R.J. Varga, J.S. Gee, J.A. Karson, Magnetic remanence and anisotropy of magnetic susceptibility of dikes from super-fast spread crust exposed at Pito Deep Rift, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 87, T51C-1546, 2006.

2007

Christeson, G.L., K.D. McIntosh, and J.A. Karson, Mapping of seismic layer 2A at intermediate-spreading crust exposed near Blanco Transform, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 88, T32B-07, 2007.

Hayman, N.W. and J.A. Karson, Faults of subaxial origin exposed in the Hess and Pito Deep Rift walls: implications for hydrothermal systems and seismicity of axial regions, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 88, T23B-1415, 2007.

Horst, A.J., J.A. Karson, R.J. Varga, and J.S. Gee, Models of deformation of uppermost oceanic lithosphere: comparison of crustal flexure in the Blönduós area, northern Iceland, and structure of East Pacific Rise crust at Hess Deep, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 88, T23B-1411, 2007.

Siler, D.L., J.A. Karson, R.J. Varga and A.J. Horst, Internal structure of the extinct Skagi-Hunafloi Rift Zone, and implications for magmatic construction, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 88, T23B-1424, 2007.

2008

Hayman, N.W. and J.A. Karson, The role of brittle deformation during fast to superfast seafloor spreading inferred from tectonic windows into East Pacific Rise Crust, EUG European General Assembly, Geophysical Research Abstracts, 10, EUG2008-A-00000, 2008.

Horst, A.J., R.J. Varga, J.S. Gee and J.A. Karson, Evidence of magmatic construction and flow within the sheeted dike complex of super-fast spread crust exposed at the Pito Deep Rift, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 89, V43I-04, 2008.

Karson, J.A., Synthesis of the Geology of Lava and Sheeted Dike Units in Oceanic Crust: Implications for Accretionary Processes, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 89, V43I-05, 2008.

Pollock, M.A., E.M. Klein, and J.A. Karson, Evolution of magmatic processes at superfast-spreading centers: Insights from spatial variations in upper crustal composition at the Pito Deep Rift, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 89, V51F-2109, 2008.

Siler, D.L., J.A. Karson and A.J. Horst, Inclined sheet swarms and associated crustal thickening at Icelandic spreading segment centers, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 89, GP13A-08, 2008.

Varga, R.J., A.J. Horst, J.A. Karson, D.L. Siler, and J.S. Gee, Rapid subsidence and formation of thick volcanic sections at magma-rich spreading centers: Paleomagnetic and AMS evidence from north-central Iceland, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement 89, GP21D-0801, 2008.

2009

Curewitz, D. and J. A. Karson, Tracking the evolution of shallow crustal permeability using repeated surveys of hydrothermally active rift zones: Insights into the R2K focus sites via analysis of Iceland rift zones, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement, 90 (52), OS21B-07, 2009.

Horst, A.J., R.J. Varga, J.A. Karson and J.S. Gee, AMS Constraints on Sill Intrusion in Magma-Rich Spreading Environments, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement, 90 (52) GP43A-0838, 2009.

Karson, J.A., D.L. Siler, A.J. Horst, R.G. Varga and D. Curewitz, Toward a Comprehensive View of Seafloor Spreading: Integrating R2K Surface Data with Subsurface Geological Perspectives, Ridge 2000 Workshop, St. Louis, MO, October 2009.

Karson, J.A., D.L. Siler, A.J. Horst, R.G. Varga and D. Curewitz, Toward a Comprehensive View of Seafloor Spreading: What’s Happening Under the R2K Study Areas? Eos Transactions of the American Geophysical Union, Fall Meeting Supplement, 90 (52), OS21B-01, 2009.

Nanfito, A.F. and J.A. Karson, Complex Rift-Parallel, Strike-Slip Faulting in Iceland: Kinematic Analysis of the Gljúfurá Fault Zone, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement, 90 (52), T21D-1866, 2009.

Siler, D.L., J.A. Karson, R.J. Varga, M.A. Pollock, A.J. Horst, and A.F. Nanfito, Structure and kinematics of segment scale crustal accretion processes in Iceland, Eos Transactions of the American Geophysical Union, Fall Meeting Supplement, 90 (52), OS13A-1165, 2009.

2010

Denny, A.R., D.S. Kelley, G.L. Früh-Green, K.A. Ludwig and J.A. Karson, Geologic Evolution and Structural Control of the Lost City Hydrothermal Field, Chapman Conference on Oceanic Detachment Faults, Cyprus, May 2010.

Karson, J.A., D.S. Kelley and G.L. Früh-Green, Detachment Shear Zone Exposed on the S. Wall of the Atlantis Massif Core Complex, Mid-Atlantic Ridge 30°N, Chapman Conference on Oceanic Detachment Faults, Cyprus, May 2010.

Karson, J.A., R.J. Varga, D.L. Siler and A.J. Horst, Subaerial Seafloor Spreading in Iceland: Segment-Scale Processes and Analogs for Fast-Spreading Mid-Ocean Ridge Spreading Centers, European Geophysical Union Meeting, Vienna, May 2010.