Tracing the fluid source of heavy REE mineralisation in carbonatites using a novel method of oxygen-isotope analysis in apatite: The example of Songwe Hill, Malawi
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- 作者：Sam Broom-Fendley<sup>asup><sup> ; sup><sup>bsup><sup> ; sup><sup>s.l.broom-fendley@ex.ac.uk" class="auth_mail" title="E-mail the corresponding authorsup> ; Timothy Heaton<sup>csup> ; Frances Wall<sup>asup> ; Gus Gunn<sup>bsup>
- 关键词：PIC ; Primary Igneous Carbonatite ; PIA ; Primary Igneous Apatite ; δ18OPO4 ; δ18O value of oxygen from the apatite PO4 site ; TREO ; total rare earth oxides ; CL ; cathodoluminescence ; HREE ; heavy rare earth element ; ML-ON ; silver phosphate preparation method after McLaughlin et al. (2004) and O'Neil et al. (1994). See Methods section 3.3 for details.
- 刊名：Chemical Geology
- 出版年：2016
- 出版时间：15 November 2016
- 年：2016
- 卷：440
- 期：Complete
- 页码：275-287
- 全文大小：1712 K
文摘
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New method analysing O-isotopes in carbonatite apatite, with an igneous apatite field proposed between + 2.5 and + 6.0‰ δ18O
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HREE-bearing apatite and carbonate δ18O values are compared from Songwe Hill
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Apatite and carbonate crystallise at different stages of the carbonatite evolution and are in isotopic disequilibrium
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Diverging apatite and carbonate δ18O values are suggested to reflect the fluid composition at differing crystallisation times
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HREE mineralisation caused by early apatite crystallisation; carbonate forms later and has higher δ18O due to reprecipitation