| Reference Type | Journal (article/letter/editorial) |
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| Title | The geochemistry and cryptic zonation of pyrochlore from San Vicente, Cape Verde Islands |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Hodgson, N. A. | Author |
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| Le Bas, M. J. | Author |
| Year | 1992 (June) | Volume | 56 |
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| Page(s) | 201-214 | Issue | 383 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_56/56-383-201.pdf+ |
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| DOI | doi:10.1180/minmag.1992.056.383.06Search in ResearchGate |
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| Mindat Ref. ID | 1812 | Long-form Identifier | mindat:1:5:1812:2 |
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| GUID | 9aa2c78d-0dd0-4885-b478-2c9a89d0bbc4 |
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| Full Reference | Hodgson, N. A., Le Bas, M. J. (1992) The geochemistry and cryptic zonation of pyrochlore from San Vicente, Cape Verde Islands. Mineralogical Magazine, 56 (383) 201-214 doi:10.1180/minmag.1992.056.383.06 |
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| Plain Text | Hodgson, N. A., Le Bas, M. J. (1992) The geochemistry and cryptic zonation of pyrochlore from San Vicente, Cape Verde Islands. Mineralogical Magazine, 56 (383) 201-214 doi:10.1180/minmag.1992.056.383.06 |
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| In | (1992, June) Mineralogical Magazine Vol. 56 (383) Mineralogical Society |
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| Abstract/Notes | AbstractZr-rich pyrochlore crystals in carbonatite from San Vicente (Cape Verdes Islands) show cryptic, concentric and rhythmic chemical zonation with Ca increasing and Ti, U and Zr decreasing towards the rims. In one carbonatite, taken from the Camile dyke, previously undocumented cryptic sector zonation of Ti, U and Zr is also observed in these crystals. The chemical variation is investigated by wavelength-dispersive electron microprobe, with both single spot and crystal map analyses.The concentric and rhythmic zonation, marked by element substitution, was generated by magma heterogeneity and/or element diffusion kinetics, but it is suggested that the sector zonation, marked by differential site substitution, was governed by protosite variation between octahedral and cubic faces. |
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