New information on the thermal history of the southwestern Lower Saxony Basin, northern Germany, based on fission track analysis |
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Authors: | Y Senglaub M R Brix A C Adriasola R Littke |
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Institution: | 1. Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University, Lochnerstr. 4-20, 52056, Aachen, Germany 2. Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universit?t Bochum, 44780, Bochum, Germany
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Abstract: | The southwestern part of the Lower Saxony Basin (LSB) is characterized by gravity and magnetic anomalies and by an extremely
high thermal maturity of organic matter. This was for many years attributed to a Late Cretaceous intrusion, but actually deep
burial is being debated. The complex thermal history of the area has been studied by fission track analysis. Zircon data provide
evidence for widespread (hydro)thermal activity during the Permian and Upper Jurassic/Lower Cretaceous. Apatite ages indicate
a major cooling event in the mid Cretaceous (∼89–72 Ma) reflecting the time of inversion of the LSB. During the Cretaceous,
the cooling of the basin centre was rapid compared to the basin margins. Apatite fission track ages from borehole samples
which are recently within the upper part of the APAZ indicate a young heating of the sedimentary sequences until present. |
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Keywords: | Fission track dating Thermal history Northern Germany Lower Saxony Basin Bramsche |
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