Greer, Heather F. and Zhou, Wuzong and Guo, Li (2015) Phase transformation of Mg-calcite to aragonite in active-forming hot spring travertines. Mineralogy and Petrology, 109 (4). pp. 453-462. DOI https://doi.org/10.1007/s00710-015-0367-5
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Greer et al. - 2015 - Phase transformation of Mg-calcite to aragonite in.pdf - Published Version Restricted to Registered users only Download (2MB) |
Abstract
A travertine specimen collected from the western part of Yunnan Province of China was subjected to microstructural analysis by powder X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. A new formation mechanism was proposed whereby polycrystalline rhombohedral particles of magnesium-containing calcite underwent a phase transformation into sheaf-like clusters of aragonite microrods. It is proposed that a high concentration of magnesium ions and embedded biological matter poisoned the growth of calcite and therefore instigated the phase transformation of the core of the rhombohedral calcite particles to an aragonite phase with a higher crystallinity. The single crystalline aragonite microrods with a higher density than the Mg-calcite nanocrystallites grew at the expense of the latter to generate sheaf-like clusters. This newly discovered formation mechanism is expected to enhance previous knowledge on this geologically important phase transformation from a morphology point of view.
Item Type: | Article |
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Uncontrolled Keywords: | 2015AREP; IA69; CASP; |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics |
Journal or Publication Title: | Mineralogy and Petrology |
Volume: | 109 |
Page Range: | pp. 453-462 |
Identification Number: | https://doi.org/10.1007/s00710-015-0367-5 |
Depositing User: | Sarah Humbert |
Date Deposited: | 25 Sep 2015 16:46 |
Last Modified: | 29 Sep 2015 15:49 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/3501 |
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