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• W4318317897 abstract "Using a single insensitive proxy in cyclostratigraphy may lead to misleading conclusions regarding timescale, paleoenvironment, paleoclimate and orbital behavior. How to obtain the most reliable one from multiple solutions of geophysical log proxies without time constraints is still an outstanding problem. Here, we develop a new method (power ratio accumulation, or PRA) combining power decomposition and null hypothesis of no astronomical forcing with the Monte Carlo simulation. This method obtains both optimal sedimentation rate and optimal proxy from multiple untuned proxy datasets. The sensitivity of multiple geophysical log proxies in lacustrine deposits is first revealed from member 1 of Nenjiang Fm of Cretaceous Continental Scientific Drilling in the Songliao Basin using this method. The results show that the optimal proxy is thorium content, followed by potassium content, uranium content and natural gamma-ray intensity, while total organic carbon content, resistivity, interval transit time and density are the worst. Evidence of phase reversal of proxies caused by the joint influence of astronomically forced weathering, water level and burial of biogenic materials is found. This supports a new mechanism that explains the sensitivity of geophysical log proxies from the perspective of phase stability. Our research not only provides a powerful tool (PRA method) for astrochronologic testing and sensitivity evaluation of multiple untuned proxy datasets, but also builds a bridge (new mechanism) between geophysical parameters and astronomically forced cycles. This will promote the application of geophysical data in the field of cyclostratigraphy." @default.
• W4318317897 created "2023-01-28" @default.
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• W4318317897 date "2023-03-01" @default.
• W4318317897 modified "2023-10-18" @default.
• W4318317897 title "Evaluating geophysical logs as proxies for cyclostratigraphy in lacustrine deposits using power ratio accumulation" @default.
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• W4318317897 doi "https://doi.org/10.1016/j.palaeo.2023.111428" @default.
• W4318317897 hasPublicationYear "2023" @default.
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