3D crystal size distributions: A case study on quantifying olivine populations in kimberlites

Jerram, Dougal A.; Mock, Alex; Davis, Graham; Field, M. Paul; Brown, Richard J.

doi:10.1016/j.lithos.2009.05.042

Cited by 81 publications

(41 citation statements)

References 45 publications

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“…In particular, the free crystal distribution of a pyroclastic deposit, which is likely to have more uniform initial size and density properties when compared to lithic fragments and juvenile clasts, can be used to interpret the transport system and emplacement process (Taddeucci and Palladino 2002). In kimberlites, the main crystal phase is olivine; however, olivine is dominantly xenocrystic and the initial crystal size distribution in the erupting kimberlite magma is likely to be more variable Jerram et al 2009). …”

Section: Discussionmentioning

confidence: 99%

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The influence of volcanological and sedimentological processes on diamond grade distribution in kimberlites: examples from the EKATI Diamond Mine, NWT, Canada

et al. 2011

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The distribution of diamonds within individual kimberlite pipes is poorly documented in the public domain due to the proprietary nature of the data. The study of the diamond distribution within two pipes, Fox and Koala, from the EKATI Diamond Mine, NWT, Canada, in conjunction with detailed facies models has shown several distinct relationships of deposit type and grade distribution. In both pipes, the lithological facies represent grade units which can be distinguished from each other in terms of relative size and abundance of diamonds. A positive relationship between olivine grain size and abundance with diamond size and abundance is observed, indicating that sorting of fragmental kimberlites influences diamond distribution. Though surface geological processes do not control the diamond potential of the erupting magma, they can be responsible for concentrating diamonds into economically significant proportions. A good understanding of the eruption, transport and depositional processes responsible for the individual lithological units and the diamond distribution within them is important for successful resource estimation. This may lead to recognition of areas suitable for selective mining, making a marginal deposit economic.

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Section: Discussionmentioning

confidence: 99%

“…More detailed crystal size distribution methods (e.g. Holden et al 2009;Jerram et al 2009;Moss et al 2010) were not utilized here due to their limited frequency of observations: detailed analysis of representative samples, rather than continuous logging.…”

Section: Methods and Datamentioning

confidence: 99%

The influence of volcanological and sedimentological processes on diamond grade distribution in kimberlites: examples from the EKATI Diamond Mine, NWT, Canada

et al. 2011

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“…Ikeda et al (2004) performed an element-concentration mapping of a Cs-doped partially molten granite by means of synchrotron X-ray micro-CT. Jerram et al (2009) studied 3D crystal size distributions of olivine in kimberlites, while Masad et al (2005) computed particle surface characteristics. Similar analysis can be applied to any other porous material, e.g.…”

Section:  3d Grain Analysismentioning

confidence: 99%

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

Cnudde

Boone

2013

Earth-Science Reviews

1,263

700

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Please cite this article as: Cnudde, V., Boone, M.N., "High-resolution X-ray computed tomography in geosciences: a review of the current technology and applications", Earth Science Reviews (2013Reviews ( ), doi: 10.1016Reviews ( /j.earscirev.2013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T AbstractHigh-resolution X-ray Computed Tomography (HRXCT) or micro-CT (µCT) is a frequently used non-destructive 3D imaging and analysis technique for the investigation of internal structures of a large variety of objects, including geomaterials. Although the possibilities of X-ray micro-CT are becoming better appreciated in earth science research, the demands on this technique are also approaching certain physical limitations. As such, there remains a lot of research to be done in order to solve all the technical problems that occur when higher demands are put on the technique. In this paper, a review of the principle, the advantages and limitations of X-ray CT itself are presented, together with an overview of some current applications of micro-CT in geosciences. One of the main advantages of this technique is the fact that it is a non-destructive characterization technique which allows 4D monitoring of internal structural changes at resolutions down to a few hundred nanometers. Limitations of this technique are the operator dependency for the 3D image analysis from the reconstructed data, the discretations effects and possible imaging artefacts. Driven by the technological and computational progress, the technique is continuously growing as an analysis tool in geosciences and is becoming one of the standard techniques, as is shown by the large and still increasing number of publications in this research area. It is foreseen that this number will continue to rise, and micro-CT will become an indispensable technique in the field of geosciences.

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“…Crystal population density is best represented by a plot of ln(n) versus crystal length (L). The histograms of volume fraction (number of crystals for each size) vs. size is another method for representing the CSD data (Higgins 2000;Jerram et al 2009). …”

Section: Theory Of Csdmentioning

confidence: 99%

Crystal size and shape distribution systematics of plagioclase and the determination of crystal residence times in the micromonzogabbros of Qisir Dagh, SE of Sabalan volcano (NW Iran)

Pourkhorsandi¹,

Mirnejad²,

Raiesi³

et al. 2015

Geologica Carpathica

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Abstract:The Qisir Dagh igneous complex occurs as a combination of volcanic and intrusive rocks to the south-east of the Sabalan volcano, north-western Iran. Micromonzogabbroic rocks in the region consist of plagioclase, alkaline feldspar and clinopyroxene as the major mineral phases and orthopyroxene, olivine, apatite and opaque minerals as the accessory minerals. Microgranular and microporphyritic textures are well developed in these rocks. Considering the importance of plagioclase in reconstructing magma cooling processes, the size and shape distribution and chemical composition of this mineral were investigated. Based on microscopic studies, it is shown that the 2-dimensional size average of plagioclase in the micromonzogabbros is 538 micrometers and its 3-dimensional shape varies between tabular to prolate. Crystal size distribution diagrams point to the presence of at least two populations of plagioclase, indicating the occurrence of magma mixing and/or fractional crystallization during magma cooling. The chemical composition of plagioclase shows a wide variation in abundances of Anorthite-Albite-Orthoclase (An = 0.31-64.58, Ab =29.26-72.13, Or = 0.9-66.97), suggesting a complex process during the crystal growth. This is also supported by the formation of antiperthite lamellae, which formed as the result of alkali feldspar exsolution in plagioclase. The calculated residence time of magma in Qisir Dagh, based on 3D crystal size distribution data, and using growth rate G = 10 -10 mm/s, varies between 457 and 685 years, which indicates a shallow depth (near surface) magma crystallization and subvolcanic nature of the studied samples.

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3D crystal size distributions: A case study on quantifying olivine populations in kimberlites

Cited by 81 publications

References 45 publications

The influence of volcanological and sedimentological processes on diamond grade distribution in kimberlites: examples from the EKATI Diamond Mine, NWT, Canada

The influence of volcanological and sedimentological processes on diamond grade distribution in kimberlites: examples from the EKATI Diamond Mine, NWT, Canada

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

Crystal size and shape distribution systematics of plagioclase and the determination of crystal residence times in the micromonzogabbros of Qisir Dagh, SE of Sabalan volcano (NW Iran)

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