| Reference Type | Journal (article/letter/editorial) |
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| Title | Formation of chlor- and fluor-apatite in layered intrusions |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Grant Cawthorn, R. | Author |
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| Year | 1994 (June) | Volume | 58 |
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| Issue | 391 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_58/58-391-299.pdf+ |
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| DOI | doi:10.1180/minmag.1994.058.391.12Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 2033 | Long-form Identifier | mindat:1:5:2033:0 |
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| GUID | 0 |
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| Full Reference | Grant Cawthorn, R. (1994) Formation of chlor- and fluor-apatite in layered intrusions. Mineralogical Magazine, 58 (391) 299-306 doi:10.1180/minmag.1994.058.391.12 |
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| Plain Text | Grant Cawthorn, R. (1994) Formation of chlor- and fluor-apatite in layered intrusions. Mineralogical Magazine, 58 (391) 299-306 doi:10.1180/minmag.1994.058.391.12 |
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| In | (1994, June) Mineralogical Magazine Vol. 58 (391) Mineralogical Society |
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| Abstract/Notes | AbstractApatite in most igneous intrusions has a high Cl/F ratio. However, chlor-apatite has been reported in the lower portions of the Bushveld and Stillwater Complexes. This has been used as evidence supporting the early separation of a Cl-rich discrete hydrous fluid in these intrusions. Mineralogical evidence is presented here to demonstrate that the Bushveld Complex, at least, formed from a nearly anhydrous magma, and did not release a hydrous fluid before apatite began to crystallize. It is suggested that apatite in the earliest cumulates equilibrated with trapped interstitial liquid, which converted it from the typical F-rich composition of cumulus apatite to a Cl-rich composition. This is an analogous process to that in which cumulus mafic minerals may become more Fe-rich on cooling and reaction with interstitial liquid. |
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