Malinverno Alberto 0000-0003-4442-9055 Erba Elisabetta Herbert Timothy D Timothy_Herbert@brown.edu 0000-0003-1556-4290 2010 The stratigraphic depth in the Cismon APTICORE borehole and the age of the average age model sampled by the Monte Carlo tuning algorithm dataset https://doi.org/10.1594/PANGAEA.762951 Malinverno Alberto 0000-0003-4442-9055 Erba Elisabetta Herbert Timothy D Timothy_Herbert@brown.edu 0000-0003-1556-4290 2010 Orbital tuning as an inverse problem: Chronology of the early Aptian oceanic anoxic event 1a (Selli Level) in the Cismon APTICORE Paleoceanography 25(2) https://doi.org/10.1029/2009PA001769 PA2203 Orbital tuning, the process of fitting sedimentary cycles to orbital periodicities, can estimate with high resolution the timing and duration of key events in the geological record. We formulate here orbital tuning as the inverse problem of finding the variation in sedimentation rate that matches sediment cycles with orbital periodicities. Instead of obtaining a single best estimate, we apply a Bayesian formulation and define a probability distribution of sedimentation rate variations that result in powerful orbital periodicities. By sampling this distribution with a Monte Carlo method, we quantify the uncertainty in the inferred sedimentation rates due to uncertainties in the tuning periods and to components of the sedimentary signal that are unrelated to orbital cycles. The method is applied to the chronology of a 30 m interval in the Cismon APTICORE borehole (Southern Alps, Italy) that includes the early Aptian oceanic anoxic event 1a (Selli Level), estimated to last 1.11 ± 0.11 Ma (95% interval). The d13C record shows a sudden negative shift of about -1 per mill at the base of the Selli Level (22-47 ka) followed by a recovery to preshift values in approx. 240 ka, consistent with a scenario where light carbon is quickly added and then flushed out of the oceanatmosphere system. 11.75 11.75 46.05 46.05 11.75 46.05 8.0 38.0 not specified APTICORE Cismon 46.05 11.75 Drilling/drill rig DRILL 131.8 m 301 CC-BY-3.0 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/ DEPTH, sediment/rock Depth sed m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock Length L http://dbpedia.org/resource/Length Depth sed [m] Age model Age model ka Time T http://dbpedia.org/resource/Time Age model, orbital tuning Malinverno Alberto 0000-0003-4442-9055 Age model [ka] supplement citable author21833 author23784 author34572 event2578210 geocode1 geocode1600 geocode1601 journal12511 license101 method10974 method497 param6 pi34572 ref34650 term1073131 term38263 term41056 term43863 term43975 topotype1