Dating volcanic materials through biochronostratigraphic methods applied to hosting strata (example from the Iberian Chain, eastern Spain)

Volcaniclastic accumulations in shallow marine environments are prone to be eroded and transported by sedimentary agents then resedimented either on contemporaneous or younger substrates. Therefore, dating of the volcanic events through sediments containing interbedded layers can lead errors. A case study volcanism southeastern Iberian Range during Early Middle Jurassic is presented. Precise hosting carbonate based ammonite brachiopod biochronostratigraphic method has allowed distinguishing 13 levels different ages ranging from early Pliensbachian Bajocian. set petrological, geomorphological, sedimentological, paleontological criteria applied order discriminate primary secondary (epiclastic) volcaniclastic deposits thus make it possible match with eruptions. Implementation such confirmed that Pliensbachian–early Bajocian interval (ca. 20 Ma) corresponds actual period activity.