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  • 标题:Zircon Typology as Indicator of Provenance in Neoproterozoic Sandstones of the Voltaian Basin, Ghana
  • 本地全文:下载
  • 作者:Chris Anani ; Masaaki Tateishi ; Daniel Asiedu
  • 期刊名称:Research Journal of Environmental and Earth Sciences
  • 印刷版ISSN:2041-0484
  • 电子版ISSN:2041-0492
  • 出版年度:2012
  • 卷号:4
  • 期号:2
  • 页码:151-161
  • 出版社:Maxwell Science Publications
  • 摘要:An investigation to identify the suitability of zircon crystals as provenance indicators of the relatively mature sandstones of the Neoproterozoic strata in the Voltaian Basin was conducted. A total of 154 zircon grains were critically studied, all extracted from 14 sandstones samples; 7 from Lower Voltaian Kwahu-Morago Group and 7 from the Middle Voltaian Oti-Pendjari Group. Zircon typology analysis indicates anatectic origin with some contribution of a volcanic material for the Kwahu-Morago Group. Zircons from the Oti-Pendjari Group, however, showed an evolution in the source-area with three probable main sources identified for the sediments. These are; (1) zircon sub-population of crustal origin as one of the sources, (2) zircon sub-population with a strong mantle affinity and towards a more aluminous type. These zircon sub-populations have been interpreted as coming either from the same calc-alkaline source rock; or that it has its origin in two distinct sources, one with calc-alkaline and the other one with a subalkaline origin. The zircon typology study here shows that the Kwahu-Morago Group experienced sediment supply mainly from the Birimian sedimentary basins with some contribution from the volcanic belts. On the other hand sediments from the Oti-Pendjari Group were mostly derived from the calc-alkaline rocks of the Pan-African orogen with minor contribution from the Birimian granitoids. This study clearly showed that zircon typology does not only help establish provenance study but also adds a considerable degree of sophistication.
  • 关键词:Provenance; sandstone; typology; voltaian basin; zircon; ;
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