Darren F. Mark, John Parnell, Simon P. Kelley, Martin R. Lee, Sarah C. Sherlock; 40Ar/39Ar dating of oil generation and migration at complex continental margins. Geology 2010; 38 (1): 75-78. doi: 10.1130/G30237.1
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Oil-bearing fluid inclusions trapped within authigenic K-feldspar in Late Jurassic reservoirs throughout the UK Atlantic margin are evidence for an early oil migration event from Late Jurassic source rocks in the Faeroe-Shetland Basin. Previous compound-specific isotope studies confirm the hydrocarbon provenance. Temperature-composition-time data show that the Late Jurassic source rocks were oil mature 113 ± 3.5 Ma (2σ). This new 40Ar/39Ar authigenic K-feldspar age shows that the Late Jurassic source rocks were oil mature 30–40 m.y. prior to current estimates.