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Study of Macroscopic and Microscopic Reaction Textures Associated with Corundum of Balangoda Region, Sri Lanka
| Title: | Study of Macroscopic and Microscopic Reaction Textures Associated with Corundum of Balangoda Region, Sri Lanka |
| Authors: | Francis, Muttarachchige D.P.L. Browse this author | | Matsueda, Hiroharu Browse this author |
| Keywords: | Reaction textures | | Corundum | | Calc-silicate | | Granulite | | Mineralization |
| Issue Date: | 2004 |
| Publisher: | Graduate School of Science, Hokkaido University |
| Citation: | Edited by Shunsuke F. Mawatari, Hisatake Okada. |
| Journal Title: | Neo-Science of Natural History: Integration of Geoscience and Biodiversity Studies : Proceedings of International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies" March 5-6, 2004, Sapporo |
| Start Page: | 129 |
| End Page: | 136 |
| Abstract: | Corundum is the most sought after gem variety among Sri Lankan gem minerals. Locations of most of the gem quality stones were identified as alluvial. The in-situ corundums rarely show a gem quality and are mostly associated with macroscopic and microscopic reaction textures. Studies of these textures, associated reactants and the intrusion of corundum by reaction products using electron probe microanalysis and energy dispersive x-ray analysis reveal that hydrous minerals such as phlogopite mica play an important role in promoting such reactions. Because of these reactions corundum is likely to be fractured and the fractures are often filled with reaction products. Hence the gem quality is not retained in most corundum after their formation. Also the natural shielding effect, called plagioclase shielding that protects corundum against the retrograde reactions, is found to be responsible for the production of valuable gem quality stones. |
| Description: | International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies". 5-6 March 2004. Sapporo, Japan. |
| Conference Name: | International Symposium on "Dawn of a New Natural History : Integration of Geoscience and Biodiversity Studies" |
| Conference Place: | Sapporo |
| Type: | proceedings |
| URI: | http://hdl.handle.net/2115/38517 |
| Appears in Collections: | Neo-Science of Natural History : Integration of Geoscience and Biodiversity Studies > Proceedings
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