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GEOCHEMICAL CHARACTERIZATION OF SUBVOLCANIC ALKALINE ROCKS FROM THE CENTRAL BOHEMIAN MASSIF BY INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS

AUTHOR/S: J. MIZERA, Z. RANDA, R. SKALA
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 29-36 pp

ABSTRACT

Continental intraplate magmatism commonly leads to formation of subvolcanic
complexes, for which it is important to characterize their mantle sources. It is necessary
to distinguish between the effects on the mantle signature of fractional crystallization
and the assimilation processes during magma ascent and its residence in the crust before
the final emplacement. Elucidation of these processes requires besides information on
Sr and Nd isotopic ratios also detailed geochemical data, especially information on
concentrations of a wide set of trace elements. An excellent case area is provided by the
Cenozoic subvolcanic rock association of the Roztoky Intrusive Centre in the Central
Bohemian Massif, Czech Republic. In the present work, instrumental neutron activation
analysis (INAA) was employed in multielement analysis of fourteen rock samples from
this area. Multimode INAA included short and long-time irradiation modes by either
reactor-pile neutrons, or by epithermal/fast neutrons (ENAA) under a Cd shielding. The
analyses enabled determination of about forty major and trace elements. The obtained
data set was analyzed and the observed major geochemical patterns have been shortly
discussed.

Keywords: Cenozoic volcanism; subvolcanic alkaline rocks; Bohemian Massif; INAA

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