| Attributes | Values |
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| rdf:type
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| Description
| - Mg-Al-rich rocks of the Southern Irumide Belt in Zambia contain mineral assemblages consisting of sapphirine-enstatiteminor spinel and later retrogressive anthophyllite-chlorite. The whole-rock compositions have high mg# 0.88 and 0.89 and indicate a sedimentary or volcanosedimentary protolith. The monazite-dominated pattern of normalized REE abundances is steep, with high LaN/YbN values of 96.1 and 67.4 and a negative Eu anomaly (Eu/Eu* = 0.58). The occurrence is an example of sapphirine formed near the low-temperature limit of its stability field. Sapphirine-enstatite geothermometry indicates (minimal) equilibration temperatures of 680-780°C. This estimate is in agreement with relatively low Al2O3 contents in enstatite near 4.4 wt. %. Chemical dating of monazite gave an Irumide age of metamorphic crystallization of 1044+-16 Ma. A minor fraction of monazite shows a superimposed partial recrystallization at ?520 Ma, during the Pan-African event. This younger recrystallization probably correlates with partial retrogression of enstatite and sapphirine to the assemblage anthophyllite-chlorite. Comparison with available data indicates that the studied sapphirine rocks, except their lower SiO2 content, are compositionally related to other magnesian-aluminous rocks such as kyanite-cordierite-anthophyllite/gedrite rocks, which also occur in the Palaeoproterozoic Muva Supergroup, or kyanite-quartz-talc schists in the Rufunsa Metavolcanic Formation.
- Mg-Al-rich rocks of the Southern Irumide Belt in Zambia contain mineral assemblages consisting of sapphirine-enstatiteminor spinel and later retrogressive anthophyllite-chlorite. The whole-rock compositions have high mg# 0.88 and 0.89 and indicate a sedimentary or volcanosedimentary protolith. The monazite-dominated pattern of normalized REE abundances is steep, with high LaN/YbN values of 96.1 and 67.4 and a negative Eu anomaly (Eu/Eu* = 0.58). The occurrence is an example of sapphirine formed near the low-temperature limit of its stability field. Sapphirine-enstatite geothermometry indicates (minimal) equilibration temperatures of 680-780°C. This estimate is in agreement with relatively low Al2O3 contents in enstatite near 4.4 wt. %. Chemical dating of monazite gave an Irumide age of metamorphic crystallization of 1044+-16 Ma. A minor fraction of monazite shows a superimposed partial recrystallization at ?520 Ma, during the Pan-African event. This younger recrystallization probably correlates with partial retrogression of enstatite and sapphirine to the assemblage anthophyllite-chlorite. Comparison with available data indicates that the studied sapphirine rocks, except their lower SiO2 content, are compositionally related to other magnesian-aluminous rocks such as kyanite-cordierite-anthophyllite/gedrite rocks, which also occur in the Palaeoproterozoic Muva Supergroup, or kyanite-quartz-talc schists in the Rufunsa Metavolcanic Formation. (en)
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| Title
| - Polymetamorphic sapphirine rocks of the Irumide age in Lower Luangwa Valley, Zambia
- Polymetamorphic sapphirine rocks of the Irumide age in Lower Luangwa Valley, Zambia (en)
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| skos:prefLabel
| - Polymetamorphic sapphirine rocks of the Irumide age in Lower Luangwa Valley, Zambia
- Polymetamorphic sapphirine rocks of the Irumide age in Lower Luangwa Valley, Zambia (en)
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| skos:notation
| - RIV/61989592:15310/08:33143341!RIV15-MSM-15310___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
| |
| http://linked.open.../riv/druhVysledku
| |
| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/61989592:15310/08:33143341
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - sapphirine, mg-al-rich rocks, monazite dating, muva supergroup, irumide event, polymetamorphism, zambia (en)
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| http://linked.open.../riv/klicoveSlovo
| |
| http://linked.open...odStatuVydavatele
| - DE - Spolková republika Německo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Neues Jahrbuch fur Mineralogie Abhandlungen
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Sulovský, Petr
- Vrána, Stanislav
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| http://linked.open...n/vavai/riv/zamer
| |
| issn
| |
| number of pages
| |
| http://bibframe.org/vocab/doi
| - 10.1127/0077-7757/2008/0101
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| http://localhost/t...ganizacniJednotka
| |
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