| Reference Type | Journal (article/letter/editorial) |
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| Title | Stressed pyroxenite nodules from the Jagersfontein kimberlite |
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| Journal | Mineralogical Magazine |
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| Authors | Borley, G. D. | Author |
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| Suddaby, P. | Author |
| Year | 1975 (March) | Volume | 40 |
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| Issue | 309 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_40/40-309-6.pdf+ |
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| DOI | doi:10.1180/minmag.1975.040.309.02Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6823 | Long-form Identifier | mindat:1:5:6823:3 |
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| GUID | 0 |
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| Full Reference | Borley, G. D., Suddaby, P. (1975) Stressed pyroxenite nodules from the Jagersfontein kimberlite. Mineralogical Magazine, 40 (309) 6-12 doi:10.1180/minmag.1975.040.309.02 |
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| Plain Text | Borley, G. D., Suddaby, P. (1975) Stressed pyroxenite nodules from the Jagersfontein kimberlite. Mineralogical Magazine, 40 (309) 6-12 doi:10.1180/minmag.1975.040.309.02 |
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| In | (1975, March) Mineralogical Magazine Vol. 40 (309) Mineralogical Society |
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| Abstract/Notes | SummaryExamination of some pyroxenite nodules from the Jagersfontein kimberlite shows that they have suffered variable deformation followed by different degrees of recovery. Most interes~ting of the nodules is the 'diallage rock', which consists of highly sheared and broken lamellar crystals of diopside containing exsolved enstatite. Petrographic evidence indicates a pre-tectonic exsolution of enstatite and a syntectonic exsolution of pyrope-almandine from enstatite. Deformation occurred in the mantle, prior to incorporation of the nodule in the kimberlite. Compositions of pyroxenes from the diallage rock suggest it re-equilibrated at a temperature of 1000° and at a pressure of about 35 kb. Olivine and phlogopite, accompanied by serpentine, occur only in broken kink-bands in the diallage rock and they are considered to be of secondary origin, precipitated from kimberlite magma at temperatures near 700° |
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