2013
Alkaline and Carbonate-rich Melt Metasomatism and Melting of Subcontinental Lithospheric Mantle: Evidence from Mantle Xenoliths, NE Bavaria, Bohemian Massif
ACKERMAN, Lukáš, Petr ŠPAČEK, Tomáš MAGNA, Jaromír ULRYCH, Martin SVOJTKA et. al.Základní údaje
Originální název
Alkaline and Carbonate-rich Melt Metasomatism and Melting of Subcontinental Lithospheric Mantle: Evidence from Mantle Xenoliths, NE Bavaria, Bohemian Massif
Autoři
ACKERMAN, Lukáš (203 Česká republika), Petr ŠPAČEK (203 Česká republika, garant, domácí), Tomáš MAGNA (203 Česká republika), Jaromír ULRYCH (203 Česká republika), Martin SVOJTKA (203 Česká republika), Ernst HEGNER (276 Německo) a Kadosa BALOGH (348 Maďarsko)
Vydání
Journal of Petrology, OXFORD, Oxford University Press, 2013, 0022-3530
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
Geochemie
Stát vydavatele
Velká Británie a Severní Irsko
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 4.485
Kód RIV
RIV/00216224:14310/13:00066971
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000327853800007
Klíčová slova anglicky
peridotite; metasomatism; subcontinental lithosphere; Sr-Nd-Li isotopes; microstructure
Změněno: 27. 3. 2014 17:29, Ing. Andrea Mikešková
Anotace
V originále
Peridotite xenoliths hosted by Cenozoic basanite lava flows (21 center dot 2-23 center dot 5 Ma) occur at several localities in the western continuation of the Ohre/Eger rift (Central European Volcanic Province) in NE Bavaria, Bohemian Massif. Detailed petrography, major and trace element compositions of whole-rock samples and selected mineral phases as well as Sr-Nd-Li isotopic compositions for a suite of mantle xenoliths from Zinst, Hirschentanz and Teichelberg document variable degrees of partial melting and metasomatism. Melting models based on whole-rock major element composition and Cr# of spinel indicate similar to 6-30% melting in the spinel stability field. Subsequent metasomatism by alkaline and carbonate-rich melts resulted in modal and cryptic metasomatism, expressed by the presence of carbonate-bearing silicate melt pockets with complex secondary mineral assemblages and by enrichment in light rare earth elements, Li, Rb, U, Pb, high field strength elements and P. The carbonate is most probably associated with fractionation of the Na-rich silicate melt. High P contents, variable but low to negative delta Li-7 values from +2 center dot 5 to -9 center dot 7 parts per thousand, coupled with Sr-87/Sr-86 ratios between similar to 0 center dot 7032 and similar to 0 center dot 7041 may reflect a significant contribution of recycled crustal material such as eclogite in the infiltrating melts responsible for metasomatism, although the Li isotope compositions may reflect kinetic modifications through diffusion. The trace element geochemistry of clinopyroxene, carbonate and melt pockets suggests that clinopyroxene plays a very important role in fractionation of the rare earth elements, high field strength elements and Sr, whereas carbonate does not host large quantities of incompatible trace elements except for Sr, Ba and, to a lesser extent, Th and U.
Návaznosti
GAP210/12/0573, projekt VaV |
|