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"Interactions between tectonics, climate, and surface processes in the " by Anna Kudriavtseva

During the Cenozoic, global cooling and uplift of the Tian Shan, Pamir, and Tibetan plateau modified atmospheric circulation and reduced moisture supply to Central Asia. These changes led to aridification in the region during the Neogene. Afterwards, Quaternary glaciations led to modification of the landscape and runoff. In the Issyk-Kul basin of the Kyrgyz Tian Shan, the sedimentary sequences reflect the development of the adjacent ranges and local climatic conditions. In this work, I reconstruct the late Miocene – early Pleistocene depositional environment, climate, and lake development in the Issyk-Kul basin using facies analyses and stable δ18O and δ13C isotopic records from sedimentary sections dated by magnetostratigraphy and 26Al/10Be isochron burial dating. Also, I present 10Be-derived millennial-scale modern and paleo-denudation rates from across the Kyrgyz Tian Shan and long-term exhumation rates calculated from published thermochronology data. This allows me to examine s ....

Oshskaya Oblast , Issyk Kul , Ysyk Kög , Kyrgyzstan General , Tian Shan , Kyrgyz Tian Shan , Kyrgyz Tian , Northern Hemisphere , 26al 10be Cosmogenic Radionuclides , Cenozoic Aridification , Tian Shan , Enudation Rates ,

"Neogene aridification and lake development in the Issyk-Kul basin, Kyr" by Anna Kudriavtseva, Edward R. Sobel et al.

Uplift of the Tian Shan range modified regional climate during Cenozoic aridification in Central Asia. This study presents facies analyses and Neogene oxygen and carbon isotopic records from magnetostratigraphically dated terrestrial sedimentary sections on the southern side of the intermontane Issyk-Kul basin in the Kyrgyz Tian Shan and 26Al/10Be isochron burial ages from the southern and eastern sides of the basin. The δ18O and δ13C data show a positive ca. 2‰ shift in values between ca. 8 and 7 Ma and a change from a negative to a positive trend. This change is attributed to the upwind growth of the Kyrgyz, Kungey and Trans Ili (Zaili) ranges, which diverted the westerlies, thereby changing the Issyk-Kul basin from a windward to a leeward position, enhancing aridification and establishing the modern-day spring and summer precipitation regime within the basin. Two 4 to 5 Ma 26Al/10Be isochron burial ages constrain the onset of Sharpyl Dak deposition on the eastern side of the bas ....

Issyk Kul , Ysyk Kög , Oshskaya Oblast , Ili Zaili , Tian Shan , Kyrgyz Tian Shan , Trans Ili , Sharpyl Dak , Northern Hemisphere , Cenozoic Aridification , Central Asia , Osmogenic Al Be 26 10 , Ectonic Uplift ,