| Reference Type | Journal (article/letter/editorial) |
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| Title | U, Th, and K distribution in a differentiated charnockite-granite intrusion and associated rocks from SW Sweden |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Constable, J. L. | Author |
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| Hubbard, F. H. | Author |
| Year | 1981 (December) | Volume | 44 |
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| Issue | 336 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_44/44-336-409.pdf+ |
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| DOI | doi:10.1180/minmag.1981.044.336.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3299 | Long-form Identifier | mindat:1:5:3299:9 |
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| GUID | 0 |
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| Full Reference | Constable, J. L., Hubbard, F. H. (1981) U, Th, and K distribution in a differentiated charnockite-granite intrusion and associated rocks from SW Sweden. Mineralogical Magazine, 44 (336) 409-415 doi:10.1180/minmag.1981.044.336.06 |
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| Plain Text | Constable, J. L., Hubbard, F. H. (1981) U, Th, and K distribution in a differentiated charnockite-granite intrusion and associated rocks from SW Sweden. Mineralogical Magazine, 44 (336) 409-415 doi:10.1180/minmag.1981.044.336.06 |
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| In | (1981, December) Mineralogical Magazine Vol. 44 (336) Mineralogical Society |
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| Abstract/Notes | AbstractThe concentrations of U, Th, and K in a charnockite-alkali granite intrusive complex from SW Sweden and associated, partly charnockitized country rocks are presented. The charnockitic components have constant low U and Th levels throughout the compositional range with a mean Th/U ratio of 1.2 to 1.5. The transition from charnockite to granite is marked by a sharp increase in Th and U concentrations with mean Th/U ratios increasing to 3.4 4.4. However, the K concentration increases relatively smoothly with increasing acidity through the compositional range studied. Late shearing of the alkali granite led to significant Th depletion with little change in the U and K concentrations. Charnockitization of the country rock granite gneisses is marked by depletion in Th and K while the U content is almost unchanged.It is suggested that the behaviour of U and Th reflects the tendency for Th to associate with magma-dissolved water whilst U shows a greater affinity for coexisting free volatiles. In the absence of a significant free volatile phase during crystallization of this charnockite-granite suite, U was incorporated into primary mineral lattice sites whereas Th entered sites from which it could be liberated more easily. |
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