Evolution of the Lower Saxony Basin

Betz, Dorothy M.; Führer, F.; Greiner, Gerhard; Plein, Eberhard

doi:10.1016/0040-1951(87)90319-2

Cited by 197 publications

(143 citation statements)

References 7 publications

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“…'Laramide' basin inversion in the central and west Netherlands Basin (Van Wijhe, 1987), Lower Saxony basin (Betz et al, 1987) and on the west margin of the Bohemian Massif (Schröder, 1987) attest to continued uplift into the Mid-and Upper Palaeocene. Further inversion between the upper Eocene and the Lower Oligocene coincides with the first substantial magmatic episode in the Odenwald, south of the Rhenish Massif.…”

Section: Relationship Between Magmatism and Basement Upliftmentioning

confidence: 99%

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics

Wilson

Downes

2006

Memoirs

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Anorogenic intra-plate magmatism was widespread in Europe from early Tertiary to Recent times, extending west to east from Spain to Bulgaria, and south to north from Sicily to northern Germany. Magmatism is spatially and temporally associated with Alpine-Pyrenean collisional tectonics, the development of an extensive lithospheric rift system in the northern foreland of the Alps, and, locally, with uplift of Variscan basement massifs (Massif Central, Rhenish Massif, Bohemian Massif). The volcanic regions vary in volume from large central volcanoes (e.g. Cantal, Massif Central;Vogelsberg, northern Germany), to small isolated plugs (e.g. Urach and Hegau provinces in southern Germany). Within the Mediterranean region, the Dinarides, the Pannonian Basin and Bulgaria, anorogenic volcanism locally postdates an earlier phase of subduction-related magmatism.The major and trace element and Sr-Nd-Pb isotope characteristics of the most primitive mafic magmatic rocks (MgO > 6 wt %) provide important constraints on the nature of the mantle source and the conditions of partial melting.. These are predominantly sodic (melilitites, nephelinites, basanites and alkali olivine basalts); however, locally, potassic magma types (olivine leucitites, leucite nephelinites) also occur. In several localities (e.g., Sicily; Vogelsberg and the Rhine Graben, Germany; Calatrava, central Spain) olivine-and quartz-tholeiites form a significant component of the magmatism. The sodic magmas were derived by variable degrees of partial melting (~ 0.5 -5 %) within a transitional zone between garnet-peridotite and spinel-peridotite mantle facies, close to the base of the lithosphere; the potassic magma types are interpreted as partial melts of enriched domains within the lithospheric mantle. Mantle partial melting was induced by adiabatic decompression of the asthenosphere, locally in small-scale, plume-like, diapirs which appear to upwell from ~ 400 km depth. 2Tertiary and Quaternary volcanic activity within Europe occurs in two principal geotectonic settings: referred to as orogenic and anorogenic by Wilson & Bianchini (1999). Occurrences of calc-alkaline volcanism (orogenic) in the Alpine chain, the Carpathians and the Mediterranean region (Harangi et al., this volume) can be explained geodynamically in terms of contemporaneous subduction, and will not be considered further in this review. Here emphasis is placed on the extensive anorogenic, dominantly alkaline, volcanic province to the north of the Alpine collision zone, including the Massif Central of France, the Rhenish Massif of northern Germany, the Rhine Graben, and the Eger Graben within the northern part of the Bohemian Massif in the Czech Republic (Figs. 1 & 2). Further to the east mafic alkaline volcanism (anorogenic) post-dates a major phase of subduction-related volcanism in the Pannonian Basin, the Dinarides (Serbia, Slovenia, Croatia, N. Bosnia), Bulgaria and western Turkey. Further south,within the Mediterranean region, anorogenic volcanism occurs in Sicily, Sardinia, Monte V...

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Section: Relationship Between Magmatism and Basement Upliftmentioning

confidence: 99%

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics

Wilson

Downes

2006

Memoirs

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“…The NGB initiated in the Late Carboniferous-Permian due to rifting processes subsequent to the Variscan orogenesis (Betz et al, 1987;Ziegler, 1990). From marine to continental conditions, the sedimentary succession is characterised by changing sedimentation environments.…”

Section: Geologic Setting and Sample Locationsmentioning

confidence: 99%

Empirical relations of rock properties of outcrop and core samples from the Northwest German Basin for geothermal drilling

Reyer

Philipp

2014

Geoth. Energ. Sci.

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Abstract. Information about geomechanical and physical rock properties, particularly uniaxial compressive strength (UCS), are needed for geomechanical model development and updating with logging-while-drilling methods to minimise costs and risks of the drilling process. The following parameters with importance at different stages of geothermal exploitation and drilling are presented for typical sedimentary and volcanic rocks of the Northwest German Basin (NWGB): physical (P wave velocities, porosity, and bulk and grain density) and geomechanical parameters (UCS, static Young's modulus, destruction work and indirect tensile strength both perpendicular and parallel to bedding) for 35 rock samples from quarries and 14 core samples of sandstones and carbonate rocks.With regression analyses (linear-and non-linear) empirical relations are developed to predict UCS values from all other parameters. Analyses focus on sedimentary rocks and were repeated separately for clastic rock samples or carbonate rock samples as well as for outcrop samples or core samples. Empirical relations have high statistical significance for Young's modulus, tensile strength and destruction work; for physical properties, there is a wider scatter of data and prediction of UCS is less precise. For most relations, properties of core samples plot within the scatter of outcrop samples and lie within the 90 % prediction bands of developed regression functions. The results indicate the applicability of empirical relations that are based on outcrop data on questions related to drilling operations when the database contains a sufficient number of samples with varying rock properties. The presented equations may help to predict UCS values for sedimentary rocks at depth, and thus develop suitable geomechanical models for the adaptation of the drilling strategy on rock mechanical conditions in the NWGB.

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“…3, 4), which show that the barite veins occupy the extensional structures and are cut and offset by the later contractional deformation. According to the observations from the North German Basin, the main period of NE-SW extension lasted from Late Jurassic to Early Cretaceous times (Betz et al 1987;Ziegler 1987;Kockel 2002) and, therefore, the barite mineralization must be placed in the time interval between the Middle Jurassic and Early Cretaceous.…”

Section: Post-variscan Evolution Of Fluids In the Thuringian Basinmentioning

confidence: 99%

Fluid evolution and mineralogy of Mn-Fe-barite-fluorite mineralizations at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in Germany

Majzlan¹,

Brey-Funke²,

Malz³

et al. 2016

Geologica Carpathica

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Numerous small deposits and occurrences of Mn-Fe-fluorite-barite mineralization have developed at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in central Germany. The studied mineralizations comprise the assemblages siderite+ankerite-calcite-fluorite-barite and hematite-Mn oxides-calcite-barite, with the precipitation sequence in that order within each assemblage. A structural geological analysis places the origin of the barite veins between the Middle Jurassic and Early Cretaceous. Primary fluid inclusions contain water vapour and an aqueous phase with NaCl and CaCl 2 as the main solutes, with salinities mostly between 24-27 mass. % CaCl 2 eq. T h measurements range between 85 °C and 160 °C in barite, between 139 °C and 163 °C in siderite, and between 80 °C and 130 °C in fluorite and calcite. Stable isotopes (S, O) point to the evaporitic source of sulphur in the observed mineralizations. The S,C,O isotopic compositions suggest that barite and calcite could not have precipitated from the same fluid. The isotopic composition of the fluid that precipitated barite is close to the sea water in the entire PermoMesozoic time span whereas calcite is isotopically distinctly heavier, as if the fluids were affected by evaporation. The fluid evolution in the siliciclastic/volcanic Rotliegend sediments (as determined by a number of earlier petrological and geochemical studies) can be correlated with the deposition sequence of the ore minerals. In particular, the bleaching of the sediments by reduced Rotliegend fluids (basinal brines) could be the event that mobilized Fe and Mn. These elements were deposited as siderite+ankerite within the Zechstein carbonate rocks and as hematite+Mn oxides within the oxidizing environment of the Permian volcanic and volcanoclastic rocks. A Middle-Jurassic illitization event delivered Ca, Na, Ba, and Pb from the feldspars into the basinal brines. Of these elements, Ba was deposited as massive barite veins.

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Evolution of the Lower Saxony Basin

Cited by 197 publications

References 7 publications

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics

Empirical relations of rock properties of outcrop and core samples from the Northwest German Basin for geothermal drilling

Fluid evolution and mineralogy of Mn-Fe-barite-fluorite mineralizations at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in Germany

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