2011
Recurrent Cenozoic volcanic activity in the Bohemian Massif (Czech Republic)
ULRYCH, Jaromír, Jaroslav DOSTAL, Jiří ADAMOVIČ, Emil JELÍNEK, Petr ŠPAČEK et. al.Základní údaje
Originální název
Recurrent Cenozoic volcanic activity in the Bohemian Massif (Czech Republic)
Autoři
ULRYCH, Jaromír (203 Česká republika), Jaroslav DOSTAL (124 Kanada), Jiří ADAMOVIČ (203 Česká republika), Emil JELÍNEK (203 Česká republika), Petr ŠPAČEK (203 Česká republika, garant, domácí), Ernst HEGNER (276 Německo) a Kadosa BALOGH (348 Maďarsko)
Vydání
Lithos, 2011, 0024-4937
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10500 1.5. Earth and related environmental sciences
Stát vydavatele
Nizozemské království
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 3.246
Kód RIV
RIV/00216224:14310/11:00056501
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000289335800010
Klíčová slova anglicky
Bohemian Massif; Cenozoic; Alkaline volcanism; Paleostress fields; Rift Mantle
Změněno: 20. 4. 2012 12:23, Ing. Andrea Mikešková
Anotace
V originále
Cenozoic anorogenic volcanism of the Bohemian Massif is an integral part of the Central European Volcanic Province. The temporal and spatial distribution of volcanic rocks in the Bohemian Massif, their geochemistry and mineralogy as well as their tectonic setting and paleostress data are used to characterize and classify this volcanic activity. Three main volcanic periods can be distinguished based on K–Ar data and known paleostress fields: (i) pre-rift (79–49 Ma), (ii) syn-rift (42–16 Ma) and (iii) late-rift (16–0.3 Ma), with the youngest period further subdivided into three episodes. The dominant mafic rock types (N7 wt.% MgO) of all periods are of nephelinite–basanite/tephrite composition. The exceptions are suites of melilitic ultramafic rocks of the pre-rift period in northern Bohemia and of the final episode of the late-rift period in western Bohemia. The most voluminous are volcanic rocks of the syn-rift period occurring in the Ohře Rift Graben. The initial 87Sr/86Sr (0.7032 to 0.7050) and 143Nd/144Nd (0.51264 to 0.51301) ratios of the mafic volcanic rocks of the Bohemian Massif are characteristic of magmas derived from a sub-lithospheric mantle source. The isotopic ratios resemble those of the HIMU mantle source (206Pb/204Pb ca. 19 to 20). These rocks have themost isotopically depleted compositions among the Central European Volcanic Province volcanics.