Research Commons
      • Browse 
        • Communities & Collections
        • Titles
        • Authors
        • By Issue Date
        • Subjects
        • Types
        • Series
      • Help 
        • About
        • Collection Policy
        • OA Mandate Guidelines
        • Guidelines FAQ
        • Contact Us
      • My Account 
        • Sign In
        • Register
      View Item 
      •   Research Commons
      • University of Waikato Research
      • Science and Engineering
      • Science and Engineering Papers
      • View Item
      •   Research Commons
      • University of Waikato Research
      • Science and Engineering
      • Science and Engineering Papers
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Discovery of halloysite books in altered silicic Quaternary tephras, northern New Zealand

      Cunningham, Michael J.; Lowe, David J.; Wyatt, Justin Burns; Moon, Vicki G.; Churchman, G. Jock
      Thumbnail
      Files
      Cunningham et al._6 Oct_FINAL prepubl version.pdf
      Accepted version, 2.461Mb
      DOI
       10.1180/claymin.2016.051.3.16
      Find in your library  
      Citation
      Export citation
      Cunningham, M. J., Lowe, D. J., Wyatt, J. B., Moon, V. G., & Churchman, G. J. (2016). Discovery of halloysite books in altered silicic Quaternary tephras, northern New Zealand. Clay Minerals, 51(3), 351–372. http://doi.org/10.1180/claymin.2016.051.3.16
      Permanent Research Commons link: https://hdl.handle.net/10289/10691
      Abstract
      Hydrated halloysite was discovered in books, a morphology previously associated exclusively with kaolinite. From ~1.5 μm to ~1500 μm in length, the books showed significantly greater mean Fe contents (Fe2O3 = 5.2 wt%) than tubes (Fe2O3 = 3.2 wt%), and expanded rapidly with formamide. They occurred, along with halloysite tubes, spheroids, and plates, in highly porous yet poorly-permeable, silt-dominated, Si-rich, pumiceous rhyolitic tephra deposits aged ~0.93 Ma (Te Puna tephra) and ~0.27 Ma (Te Ranga tephra) at three sites ~10-20 m stratigraphically below the modern land-surface in the Tauranga area, eastern North Island, New Zealand. The book-bearing tephras were at or near saturation, but have experienced intermittent partial drying, favouring the proposed changes: solubilized volcanic glass + plagioclase -> halloysite spheroids -> halloysite tubes -> halloysite plates -> halloysite books. Unlike parallel studies elsewhere involving both halloysite and kaolinite, kaolinite has not formed in Tauranga presumably because the low permeability ensures the sites largely remain locally wet so that the halloysite books are metastable. An implication of the discovery is that some halloysite books in similar settings may have been misidentified previously as kaolinite.
      Date
      2016-10-11
      Type
      Journal Article
      Publisher
      Mineralogical Society of Great Britain and Ireland
      Rights
      This is an author’s accepted version of an article published in the journal: Clay Minerals. © 2016 Clay Minerals.
      Collections
      • Science and Engineering Papers [3019]
      Show full item record  

      Usage

      Downloads, last 12 months
      104
       
       
       

      Usage Statistics

      For this itemFor all of Research Commons

      The University of Waikato - Te Whare Wānanga o WaikatoFeedback and RequestsCopyright and Legal Statement