[previous]

GSATG305A.1-f06
 

Figure 6.

δ18O data from Zaysan plotted against age. Red points are mean svita δ18O with 1σ uncertainty (x) and possible age range (y). Data from the Karabulak and Kalmakpay Sv. are smoothed using 1 Ma bandwidth Epanechnikov kernel (solid red line) with 1σ uncertainty (dashed red lines). Also plotted are published data from Central Asia (gray lines), Issyk Kul (orange line; Macaulay et al., 2016), and the Junggar Basin (brown line; Charreau et al., 2012). All are smoothed using an Epanechnikov kernel with 1 Ma bandwidth, after Caves et al. (2015). For the Akzhar Sv., we also plot the minimum δ18O value (small red point) due to evaporative enrichment in this svita. Eolian accumulation rate, as recorded by North Pacific deep-sea records (Rea et al., 1998), is a proxy for loess production. Note the prominent peak coincident with decreasing δ18Oc. Regional climatic and tectonic events are listed to the right. Shading indicates uncertainty in the timing of uplift and rain shadow development. Ol.—Oligocene; Qu.—Quaternary; Sv.—svita; VSMOW—Vienna Standard Mean Ocean Water.

[previous]