ACKERMAN, Lukáš, Gordon Jr. MEDARIS, Petr ŠPAČEK and Jaromír ULRYCH. Geochemical and petrological constraints on mantle composition of the Ohře(Eger) rift, Bohemian Massif: peridotite xenoliths from the České Středohoří Volcanic complex and northern Bohemia. International Journal of Earth Sciences. 2015, vol. 104, No 8, p. 1957-1979. ISSN 1437-3254. Available from: https://dx.doi.org/10.1007/s00531-014-1054-1.
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Basic information
Original name Geochemical and petrological constraints on mantle composition of the Ohře(Eger) rift, Bohemian Massif: peridotite xenoliths from the České Středohoří Volcanic complex and northern Bohemia
Authors ACKERMAN, Lukáš (203 Czech Republic, guarantor), Gordon Jr. MEDARIS (840 United States of America), Petr ŠPAČEK (203 Czech Republic, belonging to the institution) and Jaromír ULRYCH (203 Czech Republic).
Edition International Journal of Earth Sciences, 2015, 1437-3254.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10500 1.5. Earth and related environmental sciences
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
Impact factor Impact factor: 2.133
RIV identification code RIV/00216224:14310/15:00087046
Organization unit Faculty of Science
Doi http://dx.doi.org/10.1007/s00531-014-1054-1
UT WoS 000363871200004
Keywords in English Mantle; Xenolith; Bohemian Massif; Ohře(Eger) rift; Metasomatism
Tags AKR, rivok
Changed by Changed by: Ing. Andrea Mikešková, učo 137293. Changed: 6/4/2016 14:15.
Abstract
The Ohře(Eger) rift in the Bohemian Massif, which represents part of the Cenozoic Central European Volcanic Province, contains abundant mantle xenoliths of spinel peridotite. Petrography, geothermometry, mineral compositions and whole-rock and clinopyroxene trace element compositions of xenolith suites from four localities in the central part České Středohoří Volcanic complex (CSVC) and one locality in the eastern continuation (northern Bohemia) of the rift system display important differences that reveal small-scale compositional heterogeneity of the mantle. The xenoliths from the CSVC are mostly harzburgite that experienced high degrees of partial melting from ~17 to 21 %. However, xenoliths from one locality, Medvědický vrch, are predominantly fertile lherzolite. Subsequent pervasive metasomatism produced enrichments in light rare earth elements, large-ion lithophile elements, and U and Th, except for xenoliths from Medvědický vrch, which show marked depletions in all these elements. Such composition most likely reflects refertilization of the source rock by depleted melts. The trace element characteristics of the CSVC xenoliths indicate metasomatism of a depleted protolith by silicate melt at high melt/rock ratios. In contrast, harzburgite xenoliths from northern Bohemia experienced metasomatism at low melt/rock ratios by more evolved, alkaline and carbonate-rich melts.
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