Record details

Title
    Geochemistry of Fe-rich peridotites and associated pyroxenites from Horní Bory, Bohemian Massif: insights into subduction-related melt-rock reactions
Author
    Ackerman, Lukáš
    Jelínek, Emil
    Ježek, Josef
    Medaris Jr., Gordon
    Siebel, Wolfgang
    Strnad, Ladislav
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Chemical Geology
Vol./nr.
    Roč. 259, č. 3-4
Pages
    16
Year
    2009
Thesaurus term
    dunite- wehrlite
    Fe-rich peridotites
    Geochemistry
    melt-rockreactions
Keyword
    Associated
    Bohemian
    Bory
    Fe-rich
    Geochemistry
    Horní
    Insights
    Massif
    Melt-rock
    Peridotites
    Pyroxenites
    Reactions
    Subduction-related
Abstract (in english)
   Variscan, mantle-derived peridotites and associated pyroxenites occur as boudins in Moldanubian granulite near the town of Horní Bory in western Moravia. The peridotites consist of two compositionally distinct suites, one of Mg-lherzolite (Mg-number = 89-91, 87Sr/86Sr = 0.7046-0.7068, eNd = +4.1 to +5.3), and another of Fe-dunite/wehrlite (Mg-number = 83-88, 87Sr/86Sr = 0.7079-0.7087, eNd = ?2.8 to ?1.3). Modelling of Mg-Fe exchange between peridotite and Fe-rich melts reveals that the modal and chemical composition of the Fe-dunite/wehrlite suite can be produced by melt-rock reactions between lherzolite and SiO2-undersaturated melts of basaltic composition at melt/rock ratios ranging from 0.3 to 2. In such a model, pyroxenites represent the crystalline product (+-trapped liquid) of melts migrating along conduits in peridotite. The Fe-dunite/wehrlite suite and pyroxenites are enriched in the LILE and depleted in the HFSE. The trace element and Sr-Nd isotopic compositions of Horní Bory.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    8. 8. 2012