Chemostratigraphy (TOC, δ13C, δ18O) around the Pliensbachian/Toarcian boundary in the reference section of Peniche (Lusitanian Basin, Portugal)

Abstract

Key-words: Chemostratigraphy, TOC, Stable isotopes, Pliensbachian, Toarcian, Lusitanian Basin, Portugal. This work presents the chemostratigraphy analysis based on total organic carbon (TOC) and the evolution of the carbon and oxygen stable isotopes in the whole rock samples around the Pliensbachian/Toarcian boundary in the Peniche section (uppermost part of Lemede Formation and lowermost part of Cabo Carvoeiro Formation). These are partial results which form part of a group of studies, being processed, that include isotope analyses of 87Sr/86Sr, δ18O, δ13C and major, minor and trace elements in whole rock and belemnites.