Abstract:Compositional changes of phenanthrene (P) and methylphenanthrenes (MP) in mudstones received burial diagenesis and contact thermal alteration were examined to test their usefulness as thermal indicators. Mudstone samples were obtained from the MITI Takada-heiya well (Neogene Takada basin, Niigata, Japan) and from outcrops of the Kusanagi formation (Neogene, Yamagata, Japan), where the thermal alteration by dolerite intrusion occurred in Miocene time.Concentrations of MP increased in the sediments deeper than t… Show more
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