| Reference Type | Journal (article/letter/editorial) |
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| Title | Polystage apatite recrystallization and svanbergite formation during weathering in an acid karstic environment |
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| Journal | Mineralogical Magazine |
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| Authors | Mordberg, L. E. | Author |
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| Stanley, C. J. | Author |
| Antonov, A. V. | Author |
| Year | 2008 (February) | Volume | 72 |
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| Issue | 1 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2008.072.1.95Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 243904 | Long-form Identifier | mindat:1:5:243904:8 |
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| GUID | 0 |
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| Full Reference | Mordberg, L. E., Stanley, C. J., Antonov, A. V. (2008) Polystage apatite recrystallization and svanbergite formation during weathering in an acid karstic environment. Mineralogical Magazine, 72 (1) 95-99 doi:10.1180/minmag.2008.072.1.95 |
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| Plain Text | Mordberg, L. E., Stanley, C. J., Antonov, A. V. (2008) Polystage apatite recrystallization and svanbergite formation during weathering in an acid karstic environment. Mineralogical Magazine, 72 (1) 95-99 doi:10.1180/minmag.2008.072.1.95 |
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| Abstract/Notes | AbstractA Devonian weathering profile was developed near the contact of Riphean dolostone containing disseminated carbonate-fluorapatite and intensively pyritized black shales. Samples from the profile were investigated by XRF, SEM, electron microprobe and ion microprobe. Rock-forming minerals are apatite, diaspore, chlorite and kaolinite, while accessory minerals are svanbergite, anatase, pyrite and zircon.Primary marine carbonate-fluorapatite is represented by extremely weathered crystals concentrated near the footwall. Dissolution of apatite and pyrite provided an acidic environment that is expressed in the formation of S-rich apatite and svanbergite. The environment allowed Ti migration which formed anatase in weathered apatite grains. Coupled substitution Na+ + S6+ = Ca2+ + P5+ is suggested in S-rich apatite. A large volume of dissolved carbonate rocks was a source of Sr necessary for svanbergite formation. Apatite of the third generation formed at the final stage of weathering is represented by small (10—30 μm) very well shaped crystals. |
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