Quantitative textural analysis of packings of elongate crystals

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doi: 10.1007/s00410-008-0293-1
Authors:Rudge, John F.; Holness, Marian B.; Smith, Graham C.
Author Affiliations:Primary:
University of Cambridge, Bullard Laboratories, Cambridge, United Kingdom
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 156(4), p.413-429. Publisher: Springer International, Heidelberg - New York, International. ISSN: 0010-7999
Publication Date:2008
Note:In English. 64 refs.; illus.
Summary:The spatial distribution of grains in a solidifying igneous rock controls the physical properties of the crystal mush, and in turn is controlled by the rate of crystal growth and accumulation. A predominant non-spherical habit for igneous minerals calls into question the use of spherical particles in reference packings used for quantification of spatial distribution. Variations of crystal clustering/ordering with length scale require spatial statistics that account for the distribution of particles beyond their nearest neighbours. Using random close packings of spherocylinders, the importance of aspect ratio for the aggregation index (usually known as R) is demonstrated and it is shown that packings of spherical particles have more structure than the packings of rods. The spatial distribution functions demonstrate that the plagioclase grains in the colonnade from the Holyoke basalt are clustered on a length scale of 0.5 mm. Understanding the controls on grain spatial distribution in igneous rocks will depend on the application of these techniques to well-understood environments. [G.L.B.]
Sections:Petrology
Subsections:Igneous petrology
Subjects:Basalts; Correlation; Crystal form; Crystallization; Crystals; Deposition; Elongate minerals; Flood basalts; Holyoke Basalt; Igneous rocks; Jurassic; Lower Jurassic; Mathematical methods; Mesozoic; Packing; Petrography; Physical properties; Porosity; Quantitative analysis; Spatial distribution; Statistical analysis; Stochastic processes; Textures; Volcanic rocks; Connecticut; Massachusetts; United States
Abstract Numbers:08M/3627
Record ID:2009091498
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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