Liesegang layered clinopyroxene megacryst inclusion from Szentbékkálla, Balaton Highland, Hungary in memoriam Dr. János Bérczi /
Fourteen parallel bands composed from submillimeter sized olivine grains scattered along planes form an almost uniformly spaced (7—9 mm) layered structure in the large, decimeter sized single crystal of clinopyroxene of our Spx—3 inclusion. A medium range of uniformly enriched REE abundances, the sp...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1989
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| Sorozat: | Acta mineralogica-petrographica
30 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24766 |
| Tartalmi kivonat: | Fourteen parallel bands composed from submillimeter sized olivine grains scattered along planes form an almost uniformly spaced (7—9 mm) layered structure in the large, decimeter sized single crystal of clinopyroxene of our Spx—3 inclusion. A medium range of uniformly enriched REE abundances, the spinel-olivine components and a small (1 cm) grain of lherzolite xenolith inclusion in the Al-augite megacryst suggest a complex history of the Spx—3 specimen. Measurements carried out by optical microscopy, X-ray and electron diffraction, INAA and electron microprobe analyses have revealed textural, chemical and REE characteristics of the Spx—3 specimen's mineral components from which its formation can be reconstructed. They indicate its origin in an approximately 15% partial melting of the primary lherzolithic mantle, subsequent lherzolite inclusion transfer to the place of crystallization of this melt in the deep crust or upper mantle region where a cooling process in a concentration gradient field resulted in Liesegang layering of olivine (and partly spinel) in the megacryst producing plutonic massivum, to the final stage of uplift from the upper mantle — lower crust region by volcanic eruption which delivered the specimen to the surface and embedded it in the alkali basalt tuff of Szentbekkalla about 5 million years ago. |
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| Terjedelem/Fizikai jellemzők: | 5-17 |
| ISSN: | 0365-8066 |