Settling and Deposition of AD 181 Taupo Pumice in Lacustrine and Associated Environments

J. D L White, V. Manville, C. J N Wilson, B. F. Houghton, Nancy R Riggs, Michael H Ort

Research output: Chapter in Book/Report/Conference proceedingChapter

19 Citations (Scopus)

Abstract

Pumice is an unusual geological material. It is of low density, its density can vary, reversibly, through time, and it is capable of floating in water. These properties result directly from the abundance and interconnectedness of vesicles, which in sedimentary environments contain air and water in varying proportions. The variable density and sometimes positive buoyancy of pumice in water lead to unusual transport properties that complicate attempts to interpret the energy of depositional environments in which it is deposited. Experimental settling of AD 181 Taupo pumice confirms the general observation that larger clasts are the last to settle, indicating that progressive saturation and sinking of clasts from a pumice raft can produce a reverse-graded bed (saturation grading). Saturation of pumice clasts with water is mediated by inhomo-geneities in the vesicle population, and in particular by more rapid transport of water through larger vesicles into the interiors of the clasts. Experiments designed to evaluate the behaviour of pumice clasts after they have become saturated show that although larger clasts retain slightly lower bulk density than smaller ones, fall velocities are nevertheless proportional to grain size. Sorting of saturated pumice by fall velocity therefore produces normally graded pumice beds (redeposition grading). Subaqueous deposition of pumice from currents results in a range of conventional styles of cross-bedding, but also produces distinctive steeply imbricated clast fabrics developed by the progressive growth of bedload cluster bedforms.

Original languageEnglish (US)
Title of host publicationVolcaniclastic Sedimentation in Lacustrine Settings
PublisherWiley-Blackwell Publishing Ltd
Pages141-150
Number of pages10
ISBN (Print)9781444304251, 0632058471, 9780632058471
DOIs
StatePublished - Mar 24 2009

Fingerprint

pumice
clast
vesicle
saturation
water
cross-bedding
redeposition
bedform
bedload
depositional environment
sorting
buoyancy
bulk density
grain size
air

Keywords

  • Bedding structures - vary with style of stranding
  • Lacustrine sediments around Lake Taupo
  • Pumice depositional features
  • Pumice saturation behaviour and saturated pumice behaviour
  • Saturation of hot pumice and cold or cooling pumice
  • Saturation of pumice clasts - combination of diffusion and reticulation
  • Settling and deposition of AD 181 Taupo pumice in lacustrine and associated environments
  • Settling and deposition of pumice
  • Three ways of aqueous deposition - stranding, waterlogging, saturated-clast redeposition
  • Watersaturated AD 181 Taupo pumice

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

White, J. D. L., Manville, V., Wilson, C. J. N., Houghton, B. F., Riggs, N. R., & Ort, M. H. (2009). Settling and Deposition of AD 181 Taupo Pumice in Lacustrine and Associated Environments. In Volcaniclastic Sedimentation in Lacustrine Settings (pp. 141-150). Wiley-Blackwell Publishing Ltd. https://doi.org/10.1002/9781444304251.ch7

Settling and Deposition of AD 181 Taupo Pumice in Lacustrine and Associated Environments. / White, J. D L; Manville, V.; Wilson, C. J N; Houghton, B. F.; Riggs, Nancy R; Ort, Michael H.

Volcaniclastic Sedimentation in Lacustrine Settings. Wiley-Blackwell Publishing Ltd, 2009. p. 141-150.

Research output: Chapter in Book/Report/Conference proceedingChapter

White, JDL, Manville, V, Wilson, CJN, Houghton, BF, Riggs, NR & Ort, MH 2009, Settling and Deposition of AD 181 Taupo Pumice in Lacustrine and Associated Environments. in Volcaniclastic Sedimentation in Lacustrine Settings. Wiley-Blackwell Publishing Ltd, pp. 141-150. https://doi.org/10.1002/9781444304251.ch7
White JDL, Manville V, Wilson CJN, Houghton BF, Riggs NR, Ort MH. Settling and Deposition of AD 181 Taupo Pumice in Lacustrine and Associated Environments. In Volcaniclastic Sedimentation in Lacustrine Settings. Wiley-Blackwell Publishing Ltd. 2009. p. 141-150 https://doi.org/10.1002/9781444304251.ch7
White, J. D L ; Manville, V. ; Wilson, C. J N ; Houghton, B. F. ; Riggs, Nancy R ; Ort, Michael H. / Settling and Deposition of AD 181 Taupo Pumice in Lacustrine and Associated Environments. Volcaniclastic Sedimentation in Lacustrine Settings. Wiley-Blackwell Publishing Ltd, 2009. pp. 141-150
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N2 - Pumice is an unusual geological material. It is of low density, its density can vary, reversibly, through time, and it is capable of floating in water. These properties result directly from the abundance and interconnectedness of vesicles, which in sedimentary environments contain air and water in varying proportions. The variable density and sometimes positive buoyancy of pumice in water lead to unusual transport properties that complicate attempts to interpret the energy of depositional environments in which it is deposited. Experimental settling of AD 181 Taupo pumice confirms the general observation that larger clasts are the last to settle, indicating that progressive saturation and sinking of clasts from a pumice raft can produce a reverse-graded bed (saturation grading). Saturation of pumice clasts with water is mediated by inhomo-geneities in the vesicle population, and in particular by more rapid transport of water through larger vesicles into the interiors of the clasts. Experiments designed to evaluate the behaviour of pumice clasts after they have become saturated show that although larger clasts retain slightly lower bulk density than smaller ones, fall velocities are nevertheless proportional to grain size. Sorting of saturated pumice by fall velocity therefore produces normally graded pumice beds (redeposition grading). Subaqueous deposition of pumice from currents results in a range of conventional styles of cross-bedding, but also produces distinctive steeply imbricated clast fabrics developed by the progressive growth of bedload cluster bedforms.

AB - Pumice is an unusual geological material. It is of low density, its density can vary, reversibly, through time, and it is capable of floating in water. These properties result directly from the abundance and interconnectedness of vesicles, which in sedimentary environments contain air and water in varying proportions. The variable density and sometimes positive buoyancy of pumice in water lead to unusual transport properties that complicate attempts to interpret the energy of depositional environments in which it is deposited. Experimental settling of AD 181 Taupo pumice confirms the general observation that larger clasts are the last to settle, indicating that progressive saturation and sinking of clasts from a pumice raft can produce a reverse-graded bed (saturation grading). Saturation of pumice clasts with water is mediated by inhomo-geneities in the vesicle population, and in particular by more rapid transport of water through larger vesicles into the interiors of the clasts. Experiments designed to evaluate the behaviour of pumice clasts after they have become saturated show that although larger clasts retain slightly lower bulk density than smaller ones, fall velocities are nevertheless proportional to grain size. Sorting of saturated pumice by fall velocity therefore produces normally graded pumice beds (redeposition grading). Subaqueous deposition of pumice from currents results in a range of conventional styles of cross-bedding, but also produces distinctive steeply imbricated clast fabrics developed by the progressive growth of bedload cluster bedforms.

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KW - Three ways of aqueous deposition - stranding, waterlogging, saturated-clast redeposition

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