Petromagnetic and Related Analyses of the Middle Ordovician Sediments of the Leningrad Region (the Lynna River Section) as Markers for Detecting Traces of Meteoric Events

Prospects of petromagnetic and related methods for detecting traces of meteorite events in sedimentary successions were evaluated on the example of the Ordovician section of the Lynna River (Leningrad oblast), which reliably contains extraterrestrial matter associated with the Ordovician meteorite event. Traces of these events can serve as markers for the global correlation of sedimentary sequences, which is particularly important when the application of other methods is limited for various reasons. It has been established that classical petromagnetic methods do not reveal clear anomalies in the section interval enriched with meteoritic material and, accordingly, are ineffective for the purpose of searching for traces of global impact events. X‑ray fluorescence (XRF) analysis has demonstrated the best practical potential for detecting increased concentrations of chromium and titanium relative to the rest of the section in the interval enriched with meteoritic material. These increased concentrations are likely associated with the Ordovician meteorite event.