Fig. 4: Spectral characteristics of the KDE interval between 650 and 40 Ma for the U-Pb and U-Th/He (ZHe) record.
From: Cycles of Andean mountain building archived in the Amazon Fan
Blue or red dashed lines indicate the median smoothed spectrum (Meyers52). Peaks are only identified if they satisfy both the ML96 robust red noise model (Mann and Lees53) and MTM harmonic F-test at 85% and 90% confidence levels (e.g., Meyers54). Here, we identify two periods of 92 Ma and 57 Ma in the ZHe record, and a periodicity of 72 Ma in the DZ U-Pb record from the Amazon Fan.
