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Textural immaturity of cumulates as an indicator of magma chamber processes: infiltration and crystal accumulation in the Rum Eastern Layered Intrusion

M.B. Holness
Journal of the Geological Society, 164, 529-539, 3 May 2007, https://doi.org/10.1144/0016-76492006-021
M.B. Holness
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK (e-mail: marian@esc.cam.ac.uk)
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Abstract

Textural maturity describes the extent to which rocks have approached textural equilibrium. For igneous rocks, this is a function of the time-integrated thermal history in the sub-solidus which, for cumulate rocks, generally translates to the cooling history via the rate of solidification of the accumulating crystal mush. The most straightforward way to quantify the textural maturity of orthocumulates (sensu lato) is to measure the angle subtended at the corners of interstitial grains. Texturally mature cumulates have angle populations with median values of c. 120°, whereas texturally immature cumulates have lower medians, inherited by the interstitial phase, which infills either an impingement texture in the accumulating mush or a texturally equilibrated pore topology. Textural observations of allivalites from the Rum Layered Suite demonstrate that stratigraphically localized excursions towards textural immaturity are the result of either transient, relatively rapid, solidification rates (perhaps a result of the arrival of cold crystal-laden bodies of fluid on the chamber floor) or late-stage infiltration of fully solidified cumulates by evolved liquids expelled upwards by compaction of underlying horizons. These two processes have distinct textural and compositional signatures.

  • © 2007 The Geological Society of London
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Journal of the Geological Society: 164 (3)
Journal of the Geological Society
Volume 164, Issue 3
May 2007
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Textural immaturity of cumulates as an indicator of magma chamber processes: infiltration and crystal accumulation in the Rum Eastern Layered Intrusion

M.B. Holness
Journal of the Geological Society, 164, 529-539, 3 May 2007, https://doi.org/10.1144/0016-76492006-021
M.B. Holness
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK (e-mail: marian@esc.cam.ac.uk)
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Textural immaturity of cumulates as an indicator of magma chamber processes: infiltration and crystal accumulation in the Rum Eastern Layered Intrusion

M.B. Holness
Journal of the Geological Society, 164, 529-539, 3 May 2007, https://doi.org/10.1144/0016-76492006-021
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  • Article
    • Abstract
    • Textural maturity
    • The textural signature of processes affecting the crystal mush
    • Geological setting
    • Analytical techniques
    • Petrographic descriptions
    • Dihedral angles in the allivalites
    • Olivine compositions in the allivalites
    • Interpretation
    • Conclusions
    • Acknowledgements
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