Editing Post-Carboniferous burial and exhumation histories of Carboniferous rocks of the southern North Sea and adjacent onshore UK

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== Summary ==
 
== Summary ==
  
Previous AFTA studies in the UK southern North Sea and adjacent onshore areas have generated considerable discussion, particularly concerning the timing and magnitude of additional burial and subsequent uplift and erosion. New AFTA and VR results confirm and extend the conclusions of these earlier studies. In the southern Pennines, Carboniferous strata cooled from maximum palaeotemperatures about 100°C or more in Late Palaeozoic times, and from a peak palaeotemperature of ~80°C in Early Palaeogene times. For reasonable palaeogeothermal gradients, this palaeotemperature suggests burial by 1–2 km of Late Palaeozoic and Mesozoic rocks prior to Cainozoic exhumation. New AFTA and VR data from offshore well 47/25-1 also show that rocks of Carboniferous to Upper Cretaceous age were buried more deeply prior to exhumation that began between 90 and 40 Ma. Data from neighbouring wells refine this timing to 65–55 Ma. Combining the AFTA and VR data from the 47/25-1 well with sonic velocity-based constraints on palaeoburial suggests that an additional 800±200 m of section were deposited in 30 million years or less, prior to the onset of exhumation in Palaeocene times. A distinct Neogene phase of exhumation is not resolved from these data, although regional evidence suggests a significant proportion of the total missing section may have been removed during Neogene times. “Palaeoburial” of Carboniferous source rocks and their subsequent exhumation, recorded in AFTA, VR and sonic velocity data from the southern North Sea, have played an important role in defining and shaping the occurrences of hydrocarbons across the region.
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Previous AFTA studies in the UK southern North Sea and adjacent onshore areas have generated considerable discussion, particularly concerning the timing and magnitude of additional burial and subsequent uplift and erosion. New AFTA and VR results confirm and extend the conclusions of these earlier studies. In the southern Pennines, Carboniferous strata cooled from maximum palaeotemperatures about 100°C or more in Late Palaeozoic times, and from a peak palaeotemperature of ~80°C in Early Palaeogene times. For reasonable palaeogeothermal gradients, this palaeotemperature suggests burial by 1–2 km of Late Palaeozoic and Mesozoic rocks prior to Cainozoic exhumation. New AFTA and VR data from offshore well 47/25-1 also show that rocks of Carboniferous to Upper Cretaceous age were buried more deeply prior to exhumation that began between 90 and 40 Ma. Data from neighbouring wells refine this timing to 65–55Ma. Combining the AFTA and VR data from the 47/25-1 well with sonic velocity-based constraints on palaeoburial suggests that an additional 800±200 m of section were deposited in 30 million years or less, prior to the onset of exhumation in Palaeocene times. A distinct Neogene phase of exhumation is not resolved from these data, although regional evidence suggests a significant proportion of the total missing section may have been removed during Neogene times. “Palaeoburial” of Carboniferous source rocks and their subsequent exhumation, recorded in AFTA, VR and sonic velocity data from the southern North Sea, have played an important role in defining and shaping the occurrences of hydrocarbons across the region.
  
 
== Introduction ==
 
== Introduction ==

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