Magnetosusceptibility event and cyclostratigraphy method applied to marinerocks: Detrital input versus carbonate productivity

Magnetic susceptibility data from marine rocks can be used for global corre lation due to synchronous variations in global erosion. We show here that t he magnetic susceptibility signature, found in two forms, resides mainly in paramagnetic and other detrital constituents in most marine rocks. The fir st form is a short-term, low-magnitude, high-frequency cyclic climate signa ture that is often useful for regional correlation. The second form is a lo nger term, higher magnitude, low-frequency signature resulting from transgr essive and regressive events that can be used for global correlation. Fluct uations in detrital input, due to eustatic-based erosion, are the primary c ause of events. These fluctuations are driven by large-scale processes such as global orogenic cycles. However, variations in carbonate productivity c annot be ruled out when explaining the low-magnitude climate-driven cyclici ty also observed in magnetic susceptibility data sets.