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The structure of and origin of nodular chromite from the Troodos ophiolite, Cyprus, revealed using high-resolution X-ray computed tomography and Electron Backscatter Diffraction.

Prichard, Hazel Margaret, Barnes, S. J., Godel, B., Reddy, S., Vukmanovic, Z., Halfpenny, A., Neary, C. and Fisher, Peter Charles 2015. The structure of and origin of nodular chromite from the Troodos ophiolite, Cyprus, revealed using high-resolution X-ray computed tomography and Electron Backscatter Diffraction. Lithos 218-19 , pp. 87-98. 10.1016/j.lithos.2015.01.013

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Abstract

Nodular chromite is a characteristic feature of ophiolitic podiform chromitite and there has been much debate about how it forms. Nodular chromite from the Troodos ophiolite in Cyprus is unusual in that it contains skeletal crystals enclosed within the centres of the nodules and interstitial to them. 3D imaging and electron backscatter diffraction have shown that the skeletal crystals within the nodules are single crystals that are surrounded by a rim of polycrystalline chromite. This rim is composed of a patchwork of chromite grains that are truncated on the outer edge of the rim. 3D analysis reveals that the skeletal crystals are partially or completely formed cage or hopper structures elongated along the <111> axis. The skeletal crystals first formed undisturbed in a stagnant or slowly flowing magma supersaturated in Cr and silicates were trapped between the chromite skeletal crystal blades as they grew. The formation of skeletal crystals was followed by a crystallisation event which formed a silicate-poor rim of chromite grains around the skeletal crystals. This was subsequently subjected to corrosion or erosion probably in an environment of rapid magma flow. At contact points where nodules impinge on each other the grains of chromite are deformed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: Chromite; Nodule; Skeletal crystal; Hopper crystal
Publisher: Elsevier
ISSN: 0024-4937
Funders: CSIRO
Date of Acceptance: 19 January 2015
Last Modified: 11 Mar 2019 15:49
URI: http://orca.cf.ac.uk/id/eprint/69699

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