Ryan Portner

 

Photo of Ryan Portner

Assistant Professor: Sedimentology

Phone: 408 924-5009
Office: DH 202
Office Hours (Fall 2018): Th 10:30 - 11:30 AM or by appointment
E-mail: ryan.portner@sjsu.edu

 

Education

  • Ph.D. 2010, Macquarie University, Sydney, NSW, AUS

Research Interests

I am a sedimentologist with broad interests in volcanology, basin evolution, petrology, tectonics and Earth history. My research integrates field mapping, stratigraphy, petrography, geochemistry, and geochronology to investigate the sedimentary and tectono-magmatic evolution of the Earth. A specific research objective of mine is to better understand eruption dynamics, volcaniclast fragmentation and dispersal processes associated with submarine volcanism. To do this my research team combines field studies of modern and ancient deposits exposed on the seafloor and on land with laboratory based analytical approaches.

Ryan Portner's WebsiteResearch

Recent Classes

  • Introductory Field Camp (GEOL 129A)
  • Petrology (GEOL 122)

Recent Activity (2011-2017)

 

Peer-reviewed Papers

      • Clague, D.A., Paduan, J.B., Caress, D.W., Chadwick Jr., W.W., Le Saout, M., Dreyer, B.M., and Portner, R.A., 2017, High-resolution AUV mapping and targeted ROV observations of three historical lava flows at Axial Seamount: Oceranography, v. 30, no. 4, p. 82-99. 
      • Portner, R.A., Clague D.A., Helo C., Dreyer, B. D., Paduan, J.B., 2015, Contrasting styles of deep-marine pyroclastic eruptions revealed from Axial Seamount push core records: Earth and Planetary Science Letters, v. 423, p. 219-231, DOI:10.1016/j.epsl.2015.03.043
      • Clague, D.A., Dreyer, B.M., Paduan, J.B., Martin, J.F., Caress, D.W., Gill, J.B., Kelley, D.S., Thomas, H., Portner, R.A., Delaney, J.R., Guilderson, T.P., and McGann, M.L., 2014, Eruptive and tectonic history of the Endeavour Segment, Juan de Fuca Ridge, based on AUV mapping data and lava flow ages: Geochemistry Geophysics Geosystems, v. 15, no. 8, p. 3364 3391, DOI:10.1002/2014GC005415
      • Portner, R.A., Clague, D.A., Paduan, J.B., 2014, Caldera formation and varied eruption styles on North Pacific seamounts: the clastic lithofacies record: Bulletin of Volcanology, v. 76, no. 845, p. 28, DOI: 10.1007/s00445-014-0845-3
      • Clague, D.A., Dreyer, B.M., Paduan, J.B., Chadwick Jr., W.W., Caress, D.W., Embley, R.W., Thomas, H. Portner, R.A., Guilderson, T.P., McGann, M.L., Butterfield, D.A., 2013, Geologic History of the summit of Axial seamount, Juan De Fuca Ridge: Geochemistry Geophysics Geosystems, v. 14, no. 10, p. 4403-4443, DOI: 10.1002/ggge.20240
      • Portner, R.A., Dickinson, J.A., Daczko, N.R., 2011, Interaction of gravity flows with a rugged mid­ocean ridge seafloor: an outcrop example from Macquarie Island: Journal of Sedimentary Research, May 2011, v. 81 (5), p. 355-375, DOI: 10.2110/jsr.2011.30
      • Portner, R.A., Murphy, M.J., Daczko, N.R., 2011, A detrital record of lower oceanic crust exhumation within a Miocene slow-spreading ridge: Macquarie Island, Southern Ocean: Geological Society of America Bulletin, v. 123, p. 255-273, DOI: 10.1130/B30082.1
      • Portner, R.A., Daczko, N.R., Murphy, M.J., Pearson, N.J., 2011, Enriching mantle melts within a dying mid-ocean spreading ridge: insights from Hf-isotope and trace element patterns in detrital oceanic zircon: Lithos, v. 126, p. 355-368, DOI: 10.1016/j.lithos.2011.07.017
      • Portner, R.A., Hendrix, M.S., Stalker, J.C., Miggins, D.P., Sheriff, S.D., 2011, Sedimentary response to orogenic exhumation in the northern Rocky Mountain Basin and Range province, Flint Creek Basin, west-central Montana: Canadian Journal of Earth Sciences, v. 48, p. 1131-1153, DOI: 10.1139/e10-107
      • Portner, R.A., Daczko, N.R., Dickinson, J.A., 2010, Vitriclastic lithofacies from Macquarie Island (Southern Ocean): compositional influence on abyssal eruption explosivity in a dying Miocene spreading ridge: Bulletin of Volcanology, v. 72, p. 165-183, DOI: 10.1007/s00445-009-0312-8
      • Daczko, N.R., Harb, N., Portner, R.A., Dickinson, J.A., 2009, Geochemical fingerprint of hyaloclasts in glassy fragmental rocks of Macquarie Island: Australian Journal of Earth Sciences, v. 56, p. 951-963, DOI: 10.1080/08120090903005402
      • Dickinson, J.A., Harb., N., Portner, R.A., Daczko, N.R., 2009, Glassy fragmental rocks of Macquarie Island (Southern Ocean): Mechanism of formation and deposition: Sedimentary Geology, v. 216, p. 91-103, DOI: 10.1016/j.sedgeo.2009.02.001
      • Portner, R.A., and Hendrix, M.S., 2005, Preliminary Geologic Map of the Eastern Flint Creek Basin, West Central Montana: Montana Bureau of Mines and Geology, Open File Report 521, p. 17, 1:24,000.

Published Abstracts

      • Portner, R.A., Dreyer, B.D., Clague, D.A., 2016, Widespread hydrothermal-ash deposits in sediment cores from Axial Seamount, Juan de Fuca Ridge record deep-marine caldera formation 1300-800 yr BP: American Geophysical Union Annual Fall Meeting (San Francisco), abstract V11A-2764.
      • Portner, R.A., Dreyer, B.D., Clague, D.A., Spelz, R., Lowenstern, J.B., Paduan, J. B., Carey S., Head, J.W., 2015, Rhyolite eruption on a mid-ocean ridge: Alarcon Rise, Gulf of California: Geological Society of America Annual Meeting (Baltimore), abstract T219-145-5.

Awards and Grants

      • Portner, R.A., "Fingerprinting Source-to-Sink Associations for Deep-marine Vitriclastic Deposits and Their Association to Caldera Formation on Axial Seamount", National Science Foundation ($198,640; 9/12/2017-9/11/2020). 
      • Portner, R.A., "Hydrothermal Sedimentation in the Gulf of California", SJSU RSCA ($5,000; 5/15/17-5/14/18). 
      • Portner, R.A., “Fingerprinting source-to-sink associations for deep-marine vitriclastic deposits and their association to caldera formation on Axial Seamount”, National Science Foundation ($198,640) 09/2016—08/2019.
      • 2016 NSF grant #OCE-1634044 - Collaborative Research: Fingerprinting source-to-sink
        associations for deep-marine vitriclastic deposits and their association to caldera formation
        on Axial Seamount
      • Portner, R.A., “Dynamics and origins of explosive silicic volcanism at 2300 mbsl on a mid-ocean ridge spreading center”, National Science Foundation ($11,213) 03/2016—02/2017.
      • Portner, R.A., “Dynamics and origins of explosive silicic volcanism at 2300 mbsl on a mid-ocean ridge spreading center”, National Science Foundation ($149,892) 3/2014—02/2016.
      • 2014 NSF grant # OCE-1355436 - Collaborative research: Dynamics and origins of explosive silicic
        volcanism at 2300 mbsl on a mid-ocean spreading center
      • 2010 MBARI post-doctoral fellowship

Invited Seminars

      • Submarine Volcanism, American Geophysical Union, Hobart, Tasmania, Australian (Janurary 2017)
      • EarthByte group, School of Geosciences, University of Sydney, Sydney Australia (June 2016)
      • Earth Sciences Department, University of New England, Armidale, Australia (June 2016)
      • Earth Sciences Department, University of Tasmania, Hobart, Australia (May 2016)
      • Department of Earth and Ocean Sciences, University of South Carolina, Columbia SC (April 2016)
      • Earth Science department Macquarie University, Sydney Australia (May 2014)
      • Planetary Geology group, Geological Sciences, Brown University, Providence RI (June 2013)
      • Marine Geology and Geophysics group, University of Rhode Island Graduate School of Oceanography, Narragansett Rhode Island (March, 2013)
      • Stanford Project on Deep-Water Depositional Systems (SPODDS), Stanford University School of Earth Sciences, Stanford California (October, 2012)

Technical Presentations

      • Portner, R.A., 2017, "What can mid-ocean ridge sediments (MOR_SED) tell us about deep-sea volcanism?", presented to Earth and Planetary Sciences UC Santa Cruz (invited presentation). 
      • Portner, R.A., October 2016, “Mid-ocean ridge (MOR) sediment” presented at Department of Earth, Environment and Physics, Worcester State University, Worcester (invited presentation)
      • Portner, R.A., June 2016, “Rhyolite eruption on a nascent mid-ocean ridge: Gulf of California” presented at School of Geosciences, University of Sydney, Sydney (invited presentation)
      • Portner, R.A., June 2016, “The depths of mid-ocean ridge sedimentology (MOR-SED)” presented at Earth Sciences Department, University of New England, Armidale (invited presentation)
      • Portner, R.A., June 2016, “Eruption dynamics on the mid-ocean ridge” presented at Department of Earth and Planetary Sciences, Macquarie University, Sydney (invited presentation)
      • Portner, R.A., May 2016, “MOR Rhyolitic volcanism at 2300 mbsl” presented at Earth Sciences Department, University of Tasmania, Hobart (invited presentation)
      • Portner, R.A., April 2016, “What can mid-ocean ridge sediments tell us about deep-sea explosive volcanism?” presented at Department of Earth and Ocean Sciences, University of South Carolina, Columbia (invited presentation)
      • Portner, R.A., November 2015, “Rhyolitic volcanism on a mid-ocean ridge: Alarcon Rise” presented at Department of Earth, Environmental and Planetary Sciences, Brown University, Providence (invited presentation)

Reviewing and Editorial Service

      • Portner, R.A., Journal reviewer for:
        • Foundation for Science and Technology: Portugal
        • Geochemistry, Geophysics, and Geosystems (G-cubed)
        • Gondwana Research
        • Journal of Volcanology and Geothermal Research
        • Journal of the Geological Society
        • Marine Geology
      • Portner, R.A., Peer reviewer for:
        • National Science Foundation (2)
        • National Science Foundation: Ocean Sciences Program; Petrology Program
        • Science
        • Sedimentology

Other Professional Service

      • Portner, R.A., 2017, Program Committee member, 2017, American Geophysical Union Chapman Conference, Hobart, Tasmania, Australia