The geochemistry and mineralogy of zircons from Sri Lanka
A total of 51 sediment samples and 40 rock samples from the main gem fields of Sri Lanka have been analysed for their Zr contents. The results indicated a marked enrichment of Zr in the sediments as against the probable source rocks. Fortynine zircon separates from the gem-bearing sediments were ana...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Geological Society of Finland
1987-06-01
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| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume59/sgs_bt_059_1_pages_003_019.pdf |
| _version_ | 1818564415127027712 |
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| author | M.S. Rupasinghe C.B. Dissanayake |
| author_facet | M.S. Rupasinghe C.B. Dissanayake |
| author_sort | M.S. Rupasinghe |
| collection | DOAJ |
| description | A total of 51 sediment samples and 40 rock samples from the main gem fields of Sri Lanka have been analysed for their Zr contents. The results indicated a marked enrichment of Zr in the sediments as against the probable source rocks. Fortynine zircon separates from the gem-bearing sediments were analysed by electron microprobe and neutron activation for their trace and rare-earth element concentrations. Of the green, yellow, violet and rose zircon varieties studied, the green zircons showed relatively high enrichment in Th, U and Hf. Chondrite-normalized REE plots for five zircon separates revealed markedly similar patterns with HREE enrichments. The similarity of the plots could well indicate a similar source of origin for the zircons. Seven zoned zircons were also studied for their elemental composition. Even though there were periodic changes in the elemental composition within one zone, there were, on an average, no distinct elemental variations from the rim to the core of the zircon grain. |
| first_indexed | 2024-12-14T01:28:37Z |
| format | Article |
| id | doaj.art-34e4872ead0349e4a3d10d2cae0eb53e |
| institution | Directory Open Access Journal |
| issn | 0367-5211 1799-4632 |
| language | English |
| last_indexed | 2024-12-14T01:28:37Z |
| publishDate | 1987-06-01 |
| publisher | Geological Society of Finland |
| record_format | Article |
| series | Bulletin of the Geological Society of Finland |
| spelling | doaj.art-34e4872ead0349e4a3d10d2cae0eb53e2022-12-21T23:22:06ZengGeological Society of FinlandBulletin of the Geological Society of Finland0367-52111799-46321987-06-0159131910.17741/bgsf/59.1.001The geochemistry and mineralogy of zircons from Sri LankaM.S. RupasingheC.B. DissanayakeA total of 51 sediment samples and 40 rock samples from the main gem fields of Sri Lanka have been analysed for their Zr contents. The results indicated a marked enrichment of Zr in the sediments as against the probable source rocks. Fortynine zircon separates from the gem-bearing sediments were analysed by electron microprobe and neutron activation for their trace and rare-earth element concentrations. Of the green, yellow, violet and rose zircon varieties studied, the green zircons showed relatively high enrichment in Th, U and Hf. Chondrite-normalized REE plots for five zircon separates revealed markedly similar patterns with HREE enrichments. The similarity of the plots could well indicate a similar source of origin for the zircons. Seven zoned zircons were also studied for their elemental composition. Even though there were periodic changes in the elemental composition within one zone, there were, on an average, no distinct elemental variations from the rim to the core of the zircon grain.http://www.geologinenseura.fi/bulletin/Volume59/sgs_bt_059_1_pages_003_019.pdfsedimentsrockszirconchemical compositionrare earthsSri LankaRatnapuraElahera |
| spellingShingle | M.S. Rupasinghe C.B. Dissanayake The geochemistry and mineralogy of zircons from Sri Lanka Bulletin of the Geological Society of Finland sediments rocks zircon chemical composition rare earths Sri Lanka Ratnapura Elahera |
| title | The geochemistry and mineralogy of zircons from Sri Lanka |
| title_full | The geochemistry and mineralogy of zircons from Sri Lanka |
| title_fullStr | The geochemistry and mineralogy of zircons from Sri Lanka |
| title_full_unstemmed | The geochemistry and mineralogy of zircons from Sri Lanka |
| title_short | The geochemistry and mineralogy of zircons from Sri Lanka |
| title_sort | geochemistry and mineralogy of zircons from sri lanka |
| topic | sediments rocks zircon chemical composition rare earths Sri Lanka Ratnapura Elahera |
| url | http://www.geologinenseura.fi/bulletin/Volume59/sgs_bt_059_1_pages_003_019.pdf |
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