| Reference Type | Journal (article/letter/editorial) |
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| Title | Jadeite–K-feldspar rocks and jadeitites from northwest Turkey |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Okay, Aral I. | Author |
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| Year | 1997 (December) | Volume | 61 |
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| Issue | 409 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_61/61-409-835.pdf+ |
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| DOI | doi:10.1180/minmag.1997.061.409.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 229 | Long-form Identifier | mindat:1:5:229:7 |
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| GUID | 0 |
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| Full Reference | Okay, Aral I. (1997) Jadeite–K-feldspar rocks and jadeitites from northwest Turkey. Mineralogical Magazine, 61 (409) 835-843 doi:10.1180/minmag.1997.061.409.06 |
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| Plain Text | Okay, Aral I. (1997) Jadeite–K-feldspar rocks and jadeitites from northwest Turkey. Mineralogical Magazine, 61 (409) 835-843 doi:10.1180/minmag.1997.061.409.06 |
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| In | (1997, December) Mineralogical Magazine Vol. 61 (409) Mineralogical Society |
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| Abstract/Notes | AbstractBlueschist-facies rocks with jadeite-K-feldspar-lawsonite paragenesis occur as exotic blocks in Miocene debris flows in the blueschist belt of northwest Turkey. The jadeite-K-feldspar rocks have a very fine grain size and although recrystallized locally retain a relict porphyritic volcanic texture. The former nepheline microphenocrysts, recognized from their characteristic shapes, are pseudomorphed by jadeite and K-feldspar, while the relict magmatic aegirine has rims of jadeite. The matrix of the rock consists of very fine-grained aggregates of jadeite, K-feldspar and lawsonite. In some blocks, jadeite makes up >60% of the mode. Jadeite, K-feldspar and lawsonite in the blocks are essentially pure end-member in composition. P-T estimates for these rocks are 8 ± 2 kbar and 300 ± 50°C. The preserved volcanic texture, relict aegirine and the bulk rock composition indicate that these rocks represent metamorphosed phonolites. The paragenesis in these rocks shows that jadeite-K-feldspar is a stable mineral pair in blueschist-facies P-T conditions. |
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