Some new aspects of metallogeny of the Bohemian Massif (Central Europe)

1996 ◽  
Vol 5 (3-4) ◽  
pp. 179-190
Author(s):  
Jan H. Bernard
Keyword(s):  
Central Europe ◽  
Bohemian Massif ◽  
Massif Central

scholarly journals A new specimen of Araucaria fricii from the early Coniacian of the Bohemian Massif, Central Europe

2021 ◽  
Vol 77 (2) ◽  
pp. 282-286
Author(s):  
Jiří Kvaček
Keyword(s):  
Czech Republic ◽  
Central Europe ◽  
Bohemian Massif ◽  
Type Material ◽  
Massif Central ◽  
The Czech Republic ◽  
First Occurrence ◽  
Bohemian Cretaceous Basin ◽  
Cone Scale

A specimen of Araucaria fricii is described from the upper part of the Teplice Formation in the Bohemian Cretaceous Basin. It extends the first occurrence of A. fricii from the mid-Coniacian back to the early Coniacian. Found in the Radovesice locality near Kučlín in the northern part of the Czech Republic, it is characterised by a deltoid cone scale complex with a centrally placed seed. It is compared to the type material of A. fricii from the mid-Coniacian Březno Formation and other European Cretaceous species of Araucaria. The taphonomy and palaeoecology of A. fricii is briefly discussed.

scholarly journals Spatial and Temporal Sr–Nd–Pb Isotope Variability of Cenozoic Alkaline Volcanism in the Bohemian Massif (Central Europe)

2020 ◽  
Author(s):  
Yulia Erban Kochergina ◽  
Vladislav Rapprich ◽  
Tomáš Magna ◽  
Vojtěch Erban ◽  
Jitka Míková ◽  
...  
Keyword(s):  
Central Europe ◽  
Bohemian Massif ◽  
Pb Isotope ◽  
Massif Central ◽  
Alkaline Volcanism

scholarly journals Experimental evidence on the origin of Ca-rich carbonated melts formed by interaction between sedimentary limestones and mantle-derived ultrabasic magmas

Geology ◽  
2022 ◽  
Author(s):  
Michele Lustrino ◽  
Natascia Luciani ◽  
Vincenzo Stagno ◽  
Silvia Narzisi ◽  
Matteo Masotta ◽  
...  
Keyword(s):  
Experimental Study ◽  
Central Europe ◽  
Bohemian Massif ◽  
Potential Temperature ◽  
Volcanic Rocks ◽  
Maximum Amount ◽  
Primitive Character ◽  
Complete Dissolution ◽  
Massif Central ◽  
Limestone Assimilation

In this experimental study, we documented the formation of strongly ultrabasic and ultracalcic melts through the interaction of melilititic and basanitic melts with calcite. Three strongly to moderately SiO2-undersaturated volcanic rocks from the Bohemian Massif (central Europe) were mixed with 10, 30, and 50 wt% CaCO3 and melted at 1100, 1200, and 1300 °C at 2 kbar to evaluate the maximum amount of carbonate that can be assimilated by natural ultrabasic melts at shallow depths. Experiments revealed a surprisingly complete dissolution of the CaCO3, only rarely reaching carbonate saturation, with typical liquidus phases represented by olivine, spinel, melilite, and clinopyroxene. Only in the runs with the most SiO2-undersaturated compositions did abundant monticellite form instead of clinopyroxene. For all starting mixtures, strongly ultrabasic (SiO2 down to 15.6 wt%), lime-rich (CaO up to 43.6 wt%), ultracalcic (CaO/Al2O3 up to ~27) melt compositions were produced at 1200 and 1300 °C, with up to ~25 wt% dissolved CO2. When present, quenched olivine showed much higher forsterite content (Fo95–97) than olivine in the natural samples (Fo79–85). The two major results of this study are (1) silicate-carbonatite melt compositions do not necessarily imply the existence of carbonatitic components in the mantle, because they are also produced during limestone assimilation, and (2) Fo-rich olivines cannot be used to infer any primitive character of the melt nor high potential temperature (Tp).

Mapping seismic anisotropy of the lithospheric mantle beneath the northern and eastern Bohemian Massif (central Europe)

2012 ◽  
Vol 564-565 ◽  
pp. 38-53 ◽  
Author(s):  
Jaroslava Plomerová ◽  
Luděk Vecsey ◽  
Vladislav Babuška
Keyword(s):  
Central Europe ◽  
Bohemian Massif ◽  
Lithospheric Mantle ◽  
Seismic Anisotropy ◽  
Massif Central
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