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1 year ago in Stratigraphy By Avinash Kumar
Does anyone note these cycles?
I'm working on a high-resolution Neogene marine section, correlating my proxy data to the La2004 astronomical solution. The longer eccentricity and obliquity bands are clear, but the 100-kyr power weakens dramatically at two specific biozone boundaries. Is this a known sampling/ preservation artifact, a real climatic filter, or a problem with the astronomical tuning itself? I need context to interpret this signal loss.
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By Joshna Answered 1 year ago
This is a common and vexing issue I've encountered. Before invoking a climatic cause, I always first scrutinize the preservation potential. At biozone boundaries, we often have condensed sections or hardgrounds hiatuses that can completely remove the sedimentary expression of several short cycles. Secondly, check your temporal resolution: if sedimentation rates dropped, you may simply be undersampling the 100-kyr signal. Only after ruling out these filters should you consider a genuine climatic dampening, where the Earth's climate system became less responsive to that specific forcing frequency due to different ice sheet or carbon cycle dynamics.
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