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Tertiary alkaline Roztoky Intrusive Complex, České středohoří Mts., Czech Republic: petrogenetic characteristics
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SYSNO ASEP 0399310 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Tertiary alkaline Roztoky Intrusive Complex, České středohoří Mts., Czech Republic: petrogenetic characteristics Author(s) Skála, Roman (GLU-S) RID, SAI, ORCID
Ulrych, Jaromír (GLU-S) RID, SAI
Ackerman, Lukáš (GLU-S) RID, SAI, ORCID
Jelínek, E. (CZ)
Dostal, J. (CA)
Hegner, E. (DE)
Řanda, Zdeněk (UJF-V) RIDSource Title International Journal of Earth Sciences. - : Springer - ISSN 1437-3254
Roč. 103, č. 5 (2014), s. 1233-1262Number of pages 30 s. Publication form Online - E Language eng - English Country DE - Germany Keywords Bohemian Massif ; Cenozoic ; continental rift ; Roztoky Intrusive Complex ; alkaline intrusions ; geochemistry Subject RIV DD - Geochemistry R&D Projects IAA300130902 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) Institutional support GLU-S - RVO:67985831 ; UJF-V - RVO:61389005 UT WOS 000337748800005 EID SCOPUS 84902517811 DOI 10.1007/s00531-013-0948-7 Annotation The České středohoří Mts. is the dominant volcanic center of the Ohře (Eger) rift zone. It hosts the Roztoky Intrusive Complex (RIC), which is made up of a caldera vent and intrusions of 33–28-Ma-old hypabyssal bodies of essexite–monzodiorite–sodalite syenite series accompanied by a radially oriented 30–25-Ma-old dike swarm comprising about 1,000 dikes. The hypabyssal rocks are mildly alkaline mostly foid-bearing types of mafic to intermediate compositions. The dike swarm consists of chemically mildly alkaline and rare strongly alkaline rocks (tinguaites). The geochemical signatures of the mildly alkaline hypabyssal and associated dike rocks of the RIC are consistent with HIMU mantle sources and contributions from lithospheric mantle. The compositional variations of essexite and monzodiorite can be best explained by fractional crystallization of parent magma without significant contributions of crustal material. On the other hand, the composition of monzosyenite, leuco-monzodiorite and sodalite syenite reflects fractional crystallization coupled with variable degrees of crustal assimilation. It is suggested that the parent magmas in the Ohře rift were produced by an adiabatic decompression melting of ambient upper mantle in response to lithospheric extension associated with the Alpine Orogeny. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2015
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