TY - JOUR
T1 - Plio-Pleistocene cooling of the northeastern Tibetan Plateau due to global climate change and surface uplift
AU - Richter, Fabiana
AU - Garzione, Carmala N.
AU - Liu, Weiguo
AU - Qiang, Xiaoke
AU - Chang, Hong
AU - Cheng, Feng
AU - Li, Xiangzhong
AU - Tripati, Aradhna
N1 - Funding Information: This study was supported primarily by the National Science Foundation Partnerships for International Research and Education grant award #1545859. The author was awarded a Student Research Grant from the Geological Society of America in 2019 (partially covered the cost of analyses at the University of California Los Angeles [UCLA]). We thank collaborators at the Institute of Earth Environment, Chinese Academy of Sciences and Tripati Lab (UCLA) for their support with stable isotope and clumped isotope analyses. We thank the editors and two anonymous reviewers for their insightful comments and suggestions that helped improve the manuscript significantly. Funding Information: This study was supported primarily by the National Science Foundation Partnerships for International Research and Education grant award #1545859. The author was awarded a Student Research Grant from the Geological Society of America in 2019 (partially covered the cost of analyses at the University of California Los Angeles [UCLA]). We thank collaborators at the Institute of Earth Environment, Chinese Academy of Sciences and Tripati Lab (UCLA) for their support with stable isotope and clumped isotope analyses. We thank the editors and two anonymous reviewers for their insightful comments and suggestions that helped improve the manuscript significantly Publisher Copyright: © 2022 Geological Society of America
PY - 2023
Y1 - 2023
N2 - It has been proposed that the northeastern Tibetan Plateau (NETP) was the most recent plateau sub-region to gain elevation, leading to profound environmental changes in northern East Asia around the mid-Pliocene (ca. 3.6 Ma). Alternatively, environmental changes in the region have been linked to ongoing global cooling and glacial intensification after 3.3 Ma. Here, we test these hypotheses using Plio-Pleistocene estimates of paleotemperatures and paleoelevations in the NETP derived from oxygen and carbon stable isotopic composition (n = 792) and clumped isotope measurements (n = 32) of carbonates from a Lake Qinghai Basin sediment core, eastern NETP. From 5 to 2 Ma, basinal mean annual air temperatures (MAATs) decreased by 4.9 ± 2.8 °C at rates of 1.6 °C ± 0.5 °C/myr, concurrently with regional and global cooling. However, the largest MAAT decline occurs between ca. 4.8–3.7 Ma (4.1 ± 3.2 °C) and ca. 3.4–2.0 Ma (−0.3 ± 2.8 °C) and may correspond with an elevation change of 1.0 ± 1.0 km at 3.6 Ma, coincident with tectonic activity in the Lake Qinghai Basin and several other basins in the NETP and its foreland. Taken together, these results suggest a combination of global cooling and a small magnitude of surface uplift (<1 km) at ca. 3.6
AB - It has been proposed that the northeastern Tibetan Plateau (NETP) was the most recent plateau sub-region to gain elevation, leading to profound environmental changes in northern East Asia around the mid-Pliocene (ca. 3.6 Ma). Alternatively, environmental changes in the region have been linked to ongoing global cooling and glacial intensification after 3.3 Ma. Here, we test these hypotheses using Plio-Pleistocene estimates of paleotemperatures and paleoelevations in the NETP derived from oxygen and carbon stable isotopic composition (n = 792) and clumped isotope measurements (n = 32) of carbonates from a Lake Qinghai Basin sediment core, eastern NETP. From 5 to 2 Ma, basinal mean annual air temperatures (MAATs) decreased by 4.9 ± 2.8 °C at rates of 1.6 °C ± 0.5 °C/myr, concurrently with regional and global cooling. However, the largest MAAT decline occurs between ca. 4.8–3.7 Ma (4.1 ± 3.2 °C) and ca. 3.4–2.0 Ma (−0.3 ± 2.8 °C) and may correspond with an elevation change of 1.0 ± 1.0 km at 3.6 Ma, coincident with tectonic activity in the Lake Qinghai Basin and several other basins in the NETP and its foreland. Taken together, these results suggest a combination of global cooling and a small magnitude of surface uplift (<1 km) at ca. 3.6
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U2 - 10.1130/B36302.1
DO - 10.1130/B36302.1
M3 - Article
SN - 0016-7606
VL - 135
SP - 1327
EP - 1343
JO - Bulletin of the Geological Society of America
JF - Bulletin of the Geological Society of America
IS - 5-6
ER -