| Reference Type | Journal (article/letter/editorial) |
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| Title | The nodular granite of Castanheira, north central Portugal: origin of the nodules and evidence for diapiric mobilization of granite |
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| Journal | Geological Magazine |
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| Authors | Reavy, R. J. | Author |
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| Hutton, D. H. W. | Author |
| Finch, A. A. | Author |
| Year | 1993 (March) | Volume | 130 |
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| Issue | 2 |
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| Publisher | Cambridge University Press (CUP) |
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| DOI | doi:10.1017/s001675680000981xSearch in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 255685 | Long-form Identifier | mindat:1:5:255685:1 |
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| GUID | 0 |
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| Full Reference | Reavy, R. J., Hutton, D. H. W., Finch, A. A. (1993) The nodular granite of Castanheira, north central Portugal: origin of the nodules and evidence for diapiric mobilization of granite. Geological Magazine, 130 (2) 145-153 doi:10.1017/s001675680000981x |
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| Plain Text | Reavy, R. J., Hutton, D. H. W., Finch, A. A. (1993) The nodular granite of Castanheira, north central Portugal: origin of the nodules and evidence for diapiric mobilization of granite. Geological Magazine, 130 (2) 145-153 doi:10.1017/s001675680000981x |
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| In | (1993, March) Geological Magazine Vol. 130 (2) Cambridge University Press (CUP) |
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| Abstract/Notes | AbstractThe Castanheira pluton in north-central Portugal is a small (1000 m × 600 m) granite body of Hercynian age which contains a remarkable abundance of granite-cored, biotite-rimmed nodules. The nodules are interpreted as representing original bubbles in the uppermost volatile-rich zone of a granitic pluton. Strong depletion in K and Rb in the host granite around the nodules suggests that the biotite is magmatic in origin. The nodules may have formed by reaction between chloroferrate(II) complexes in the vapour phase and silicate melt, possibly followed by condensation of the vapour phase to a small granitic core. Motion of the vapour bubble stabilized a gradient in chemical potential with respect to the host granite, giving rise to the nodules. Chemical, petrological and structural data suggest that the pluton was part of a larger granite body, which was forcefully emplaced during synchronous transcurrent shearing. The inferred presence of volatiles, in addition to the pervasive tourmalinization of the roof zone, suggest that the magma was halogen-rich; this may imply that the magma had low viscosity. |
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