Geochemical composition of oils from the Gifhorn Trough and Lower Saxony Basin in comparison to Posidonia Shale source rocks from the Hils Syncline, Northern Germany

Amongst the rich and fairly diverse echinoid faunas from the Campanian marl/marly limestone facies as exposed at the large quarries of the cement industry near Höver and Misburg (east of Hannover, northern Germany), there are a few rare taxa, most of which have not been recorded previously from the Lower Saxony Basin. These include Echinogalerus peltiformis (Wahlenberg, 1821), Conulus (C.) matesovi Poslavskaia & Moskvin in Moskvin 1959, Hagenowia blackmorei Wright & Wright, 1949, Diplodetus sp., and Peroniaster cotteaui Gauthier in Peron 1887. New material of another rare species, Hemiaster gr. aquisgranensis Schlüter, 1899, is here described. The palaeoecological significance of the rarity of these is briefly discussed. Of particular note, in a palaeobiogeographic context, are E. peltiformis and C. matesovi. The former is well known from Lower and Upper Campanian arenitic facies in southern Sweden, while the latter was held to be confined to the Lower Campanian of the Caucasus and Kazakhstan. These two species may have immigrated into the Lower Saxony Basin following transgressive pulses or within transgressive systems tracts. Die reiche und vergleichsweise diverse Echinidenfauna der Mergel/Mergelkalk-Rhythmite des Campans von Misburg und Höver bei Hannover enthält einige seltene Taxa, die bisher aus dem Niedersächsischen Becken nicht bekannt waren. Dazu gehören Echinogalerus peltiformis (Wahlenberg, 1821), Conulus (C.) matesovi Poslavskaia & Moskvin in Moskvin 1959, Hagenowia blackmorei Wright & Wright, 1949, Diplodetus sp. und Peroniaster cotteaui Gauthier in Peron 1887. Für eine weitere Art, Hemiaster gr. aquisgranensis Schlüter, 1899, werden neue Funde beschrieben. Die paläoökologische Bedeutung der Seltenheit der vorliegenden Taxa wird diskutiert. Als besonders bedeutsam erweisen sich dabei die Vorkommen von E. peltiformis und C. matesovi. Ersterer war bisher ausschließlich aus den küstennahen Kalkareniten Südschwedens bekannt, letzterer wurde bisher nur im Untercampan des Kaukasus und von Asserbaidschan und Kasachstan nachgewiesen. Beide Arten sind wahrscheinlich im Rahmen transgressiver Schübe dritter Ordnung in das Niedersächsische Becken eingewandert. doi:<a href="http://dx.doi.org/10.1002/mmng.20020050109" target="_blank">10.1002/mmng.20020050109</a>

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Impact of burial history on petrophysical properties of Jurassic and Lower Cretaceous mudstones as potential nuclear waste storage sites in the Lower Saxony Basin, Northern Germany

Zeitschrift der Deutschen Gesellschaft für Geowissenschaften ◽

10.1127/zdgg/2019/0191 ◽

2019 ◽

Vol 170 (3-4) ◽

pp. 339-355

Author(s):

Reinhard Fink ◽

Vanessa Frohn ◽

Felix Froidl ◽

Ralf Littke ◽

Anna Kathrin Uffmann

Keyword(s):

Nuclear Waste ◽

Lower Cretaceous ◽

Petrophysical Properties ◽

Burial History ◽

Northern Germany ◽

Lower Saxony ◽

Nuclear Waste Storage ◽

Lower Saxony Basin ◽

Waste Storage

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Estimates of shale gas contents in the Posidonia Shale and Wealden of the westcentral Lower Saxony Basin from high-resolution 3D numerical basin modelling

Zeitschrift der Deutschen Gesellschaft für Geowissenschaften ◽

10.1127/zdgg/2016/0053 ◽

2016 ◽

Vol 167 (2-3) ◽

pp. 295-314 ◽

Cited By ~ 2

Author(s):

Daniel Mohnhoff ◽

Ralf Littke ◽

Victoria F. Sachse

Keyword(s):

High Resolution ◽

Shale Gas ◽

Lower Saxony ◽

Basin Modelling ◽

Lower Saxony Basin ◽

Posidonia Shale

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Biostratigraphic constraints of the Early Toarcian Oceanic Anoxic Event: new data from calcareous nannofossil investigations of Boreal and Tethyan sections

10.7287/peerj.preprints.27999 ◽

2019 ◽

Author(s):

Stefano Visentin ◽

Elisabetta Erba ◽

Joerg Mutterlose

Keyword(s):

Calcareous Nannofossil ◽

Northern Germany ◽

Lower Saxony ◽

Oceanic Anoxic Event ◽

Anoxic Event ◽

First Occurrence ◽

Calcareous Nannofossil Biostratigraphy ◽

Posidonia Shale ◽

Boreal Realm ◽

Interval Expression

Calcareous nannofossil biostratigraphy was carried out in Upper Pliensbachian – Lower Toarcian sediments, which cover the Toarcian Oceanic Anoxic Event (T-OAE) interval. In particular, semiquantitative analyses were performed on a total of 156 samples in the composite Sogno Core (Lombardy Basin, Southern Alps) representing a pelagic Tethyan section. Quantitative investigations were applied to additional 168 samples across the Amaltheenton Fm. and Posidonienschiefer Fm., from two cores of the Boreal Realm (Lower Saxony Basin, northern Germany). Primary and secondary events of the Tethyan and Boreal zonations were recognized, allowing the identifications of the NJT5, NJT6 nannofossil Zones for the Sogno Core and the NJ5, NJ6, NJ7 Zones for the German sections, respectively. The sequence of nannofossil biohorizons is generally consistent with data available for various areas at lower and higher latitudes, confirming their reproducibility and reliability for intra and inter-regional correlations. Geochemistry evidences the presence of the negative C isotopic excursion across the “Fish Level” black shale interval expression of the T-OAE in the Sogno Core. The same anomaly is recorded in the German successions at the base of the Posidonia Shale witnessing the passage from well oxygenated to predominantly anoxic conditions. Our results show that the T-OAE C isotopic excursion recorded in the Sogno Core is excellently constrained by the first occurrence (FO) of Carinolithus superbus at the onset and the last occurrence (LO) of Mitrolithus jansae at the end. A significant decrease in abundance and size of Schizosphaerella punctulata (the “S. punctulata crisis”) and an abundance drop of M. jansae further characterise the T-OAE perturbation. Only S. punctulata shows a recovery at the end of the T-OAE, while M. jansae barely survived the palaeoenviromental stress and disappeared soon after its termination. The extreme rareness of S. punctulata and the absence of M. jansae in the Boreal Realm prevent the recognition of the “S. punctulata crisis” and the M. jansae decline. Our study reveals the LO of Biscutum finchii together with the FO of C. superbus as an additional event approximating the onset of the C isotopic excursion exclusively in the German successions. Further events, such as the LOs of Biscutum grandis, Crepidolithus granulatus and Parhabdolithus liasicus are detected within the C isotopic anomaly exclusively in the German sections. Nannofossil biostratigraphy permits the effective dating and correlating of Early Jurassic major palaeoceanographic events and particularly of the T-OAE which are of a great importance to derive a definitive model for the Posidonia Shale deposition.

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