Fig. 2: Comparison of speleothem deposition period in Taba-Ba’astakh to other climate records.
From: Arctic speleothems reveal nearly permafrost-free Northern Hemisphere in the late Miocene
The timing of speleothem deposition in Taba-Ba’astakh is shown by the isochron age (blue diamond) with its 2 S.D. uncertainty (blue vertical bold line), and the average age of the 19 most radiogenic samples (yellow triangle) with its 2 S.D. uncertainty (light-yellow shading). The periods of speleothem growth are compared with loess smoothed marine benthic stack δ18O (α = 1)41 (greyish-blue line), Uk37 sea surface temperature (SST) reconstructions from Ocean drilling programme (ODP) site 151–907 (western Arctic, red line, after correcting for minor plate motion, where data show the average of two different calibration reconstructions)18, OH-GDGT%-SST from ODP site 910 C (purple line and circles)42 and the ACEX borehole Uk37 SST reconstructions (blue line and rectangles)29. The Taba-Ba’astakh speleothems’ clumped isotopes temperatures range is marked by yellow star with olive error bars (95% confidence ranges). The light-blue shading on the left shows the period when ice-rafted debris appears in ODP-151-907 borehole43.
