| Reference Type | Journal (article/letter/editorial) |
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| Title | Relationships Between Late Caledonian Lamprophyric, Syenitic, and Granitic Magmas in a Differentiated Dyke, Southern Scotland |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Macdonald, R. | Author |
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| Rock, N. M. S. | Author |
| Rundle, C. C. | Author |
| Russell, O. J. | Author |
| Year | 1986 (December) | Volume | 50 |
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| Issue | 358 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_50/50-358-547.pdf+ |
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| DOI | doi:10.1180/minmag.1986.050.358.01Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3900 | Long-form Identifier | mindat:1:5:3900:4 |
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| GUID | 0 |
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| Full Reference | Macdonald, R., Rock, N. M. S., Rundle, C. C., Russell, O. J. (1986) Relationships Between Late Caledonian Lamprophyric, Syenitic, and Granitic Magmas in a Differentiated Dyke, Southern Scotland. Mineralogical Magazine, 50 (358) 547-557 doi:10.1180/minmag.1986.050.358.01 |
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| Plain Text | Macdonald, R., Rock, N. M. S., Rundle, C. C., Russell, O. J. (1986) Relationships Between Late Caledonian Lamprophyric, Syenitic, and Granitic Magmas in a Differentiated Dyke, Southern Scotland. Mineralogical Magazine, 50 (358) 547-557 doi:10.1180/minmag.1986.050.358.01 |
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| In | (1986, December) Mineralogical Magazine Vol. 50 (358) Mineralogical Society |
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| Abstract/Notes | AbstractThe 2 km × 5 m Newmains Dyke in the Scottish Southern Uplands consists mainly of primitive (mg number > 70), at least partly mantle-derived lamprophyre (vogesite spessartite, SiO2 50–60%), with hornblende-pyroxene-rich cumulates (SiO2 < 50%) and small amounts of quartz syenitic to granite residua (60–73% SiO2). The lamprophyres and cumulates yield an Rb-Sr whole-rock isochron age of 395±9 Ma (MSWD 2.0), and (87Sr/86Sr)i 0.70514±5—identical values to the nearby Criffell granitic pluton. After some 65% hornblende + clinopyroxene fractionation of parent lamprophyre magma, a volatile phase separated and metasomatically enriched the country rock greywackes in K, Ba, and Rb. The remaining quartz syenitic liquids became contaminated by 87Sr from these greywackes, which have a mean (87Sr/86Sr)395 value of 0.70789±114. Further fractionation of the contaminated syenitic liquids gave the granitic rocks, which have (87Sr/86Sr)395 values of 0.7056–64. The dyke appears to demonstrate in situ some of the hidden processes previously invoked to explain the evolution of the Criffell pluton itself. |
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