scholarly journals Late Miocene–Pliocene range growth in the interior of the northeastern Tibetan Plateau

Lithosphere ◽  
2011 ◽  
Vol 3 (6) ◽  
pp. 420-438 ◽  
Author(s):  
William Craddock ◽  
Eric Kirby ◽  
Huiping Zhang
Keyword(s):  
Tibetan Plateau ◽  
Late Miocene ◽  
Northeastern Tibetan Plateau

scholarly journals An Early Miocene Lowland on the Northeastern Tibetan Plateau

2021 ◽  
Vol 9 ◽  
Author(s):  
Qian Tian ◽  
Xiaomin Fang ◽  
Yan Bai ◽  
Chihao Chen ◽  
Juzhi Hou ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Sea Level ◽  
Late Miocene ◽  
Qaidam Basin ◽  
Early Miocene ◽  
Annual Average ◽  
Northeastern Tibetan Plateau ◽  
The Mean ◽  
First Time ◽  
Glycerol Dialkyl Glycerol Tetraethers

The northeastern Tibetan Plateau (NE TP) has long been thought to be the last part of the Plateau to be raised, but this assumption has been challenged by recent analyses of fossil leaf energy, which have pointed to the possibility that the present surface altitude of ∼3,000 m above sea level (asl) in the Qaidam Basin (QB) was attained during the Oligocene. Here, for the first time, we present a record of glycerol dialkyl glycerol tetraethers (GDGTs) from a well-dated Cenozoic section in the QB. This record appears to demonstrate that the mean annual average paleotemperature of the QB was 28.4 ± 2.9°C at ∼18.0 Ma. This would suggest that the paleoelevation of the QB was only ∼1,488 m asl at that time and that a ∼1,500 m uplift was attained afterwards, in agreement with the massive shortening of the QB and the rapid drying of inland Asia since the late Miocene.

A late Miocene ostracod record from the northeastern Tibetan Plateau

2018 ◽  
Vol 61 (3) ◽  
pp. 297-312
Author(s):  
Fengyan Lu ◽  
Zhisheng An ◽  
John Dodson ◽  
Xiangzhong Li ◽  
Hong Yan
Keyword(s):  
Tibetan Plateau ◽  
Late Miocene ◽  
Northeastern Tibetan Plateau

scholarly journals Sporopollen evidence for Late Miocene stepwise aridification on the Northeastern Tibetan Plateau

2015 ◽  
Vol 11 (6) ◽  
pp. 5243-5268 ◽  
Author(s):  
J. Liu ◽  
J. J. Li ◽  
C. H. Song ◽  
H. Yu ◽  
T. J. Peng ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Late Miocene ◽  
Temperate Forest ◽  
Vegetation Succession ◽  
Tectonic Activity ◽  
Forest Steppe ◽  
The Tibetan Plateau ◽  
Humid Climate ◽  
Northeastern Tibetan Plateau ◽  
Global Cooling

Abstract. Holding a climatically and geologically key position both regionally and globally, the northeastern Tibetan Plateau provides a natural laboratory for understanding the interactions between tectonic activity and the evolution of Asian aridification. Determining when and how the Late Miocene climate evolved on the northeastern Tibetan Plateau may help us understand better relations between tectonic uplift, global cooling and ecosystem evolution. Previous paleoenvironmental research has focused on the western Longzhong Basin. Late Miocene aridification data derived from sporopollen now requires corroborative evidence from the eastern Longzhong Basin. Here, we present a Late Miocene sporopollen record from the Tianshui Basin in the eastern Longzhong Basin. Our results show a two-stage stepwise aridification: a temperate forest with a more humid climate developed in the basin between 11.4 and 10.1 Ma, followed by a temperate open forest environment with a less humid climate between 10.1 and 7.4 Ma; and an open temperate forest-steppe environment with a relatively arid climate occupied the basin during 7.4 to 6.4 Ma. The vegetation succession demonstrates that Asian aridification occurred after ~ 7–8 Ma, which is confirmed by other evidence from Asia. Furthermore, this persistent aridification on the northeastern Tibetan Plateau parallels the global cooling of the Late Miocene; the stepwise vegetation succession is consistent with the major uplift of the northeastern Tibetan Plateau during this time. These integrated environmental proxies indicate that global cooling may have been a potential driving force for Asian interior aridification, most likely enhanced by stepwise uplift of the Tibetan Plateau.

A Late Miocene terrestrial temperature history for the northeastern Tibetan Plateau’s period of tectonic expansion

2020 ◽  
Author(s):  
Yan Bai ◽  
Chihao Chen ◽  
Xiaomin Fang ◽  
Haichao Guo ◽  
Qaingquan Meng ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Late Miocene ◽  
Active Regions ◽  
Temperature History ◽  
Northeastern Tibetan Plateau ◽  
Climate Patterns ◽  
Tectonically Active ◽  
Regional Tectonic ◽  
S Period ◽  
Tectonic Forcing

<p>During the Late Miocene, the climate patterns and ecosystems of continental land masses experienced crucial transitions, but whether the principal driver was regional tectonic forcing or a decline in CO<sub>2</sub> concentrations remains debated. Terrestrial paleotemperature records from tectonically active regions can conserve both paleoaltitudinal and global temperature changes which have occurred as a result of fluctuations in the levels of CO<sub>2</sub>. However, high-quality quantitative data remain scarce, due to the lack of terrestrial paleotemperature reconstruction tools and well-dated continuous stratigraphic sequences. Based on a continuous sedimentary sequence with high precision dating from ~54-4.8 Ma in Xining Basin, northeastern Tibetan Plateau established, and evaluation of the potentiality of the branched glycerol dialkyl glycerol tetraethers (brGDGTs) in paleotemperature/paleoelevation reconstruction in Tibetan Plateau by our group, we present a terrestrial paleotemperature record spanning ~12.7-5.2 Ma based on tetraether lipids extracted from the northeastern Tibetan Plateau. Our results reveal a sharp cooling (~8°C) during ~10.5-8 Ma, asynchronous with minor fluctuations in global sea temperatures, suggesting a rapid tectonic uplift of ~1 km in extent. This event appears consistent with the simultaneous aridification and transitions of ecosystems experienced in adjacent regions. Moreover, the amplitude of the cooling over land is less than that which occurred over the ocean during the CO<sub>2</sub>-dominated Late Miocene cooling event (~7-5.4 Ma). We therefore concluded that tectonic forcing, rather than a decline in CO<sub>2</sub> levels, most likely dominated continental climate patterns and ecosystem transitions during the Late Miocene.</p>

scholarly journals Palynological evidence for late Miocene stepwise aridification on the northeastern Tibetan Plateau

2016 ◽  
Vol 12 (7) ◽  
pp. 1473-1484 ◽  
Author(s):  
Jia Liu ◽  
Ji Jun Li ◽  
Chun Hui Song ◽  
Hao Yu ◽  
Ting Jiang Peng ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Late Miocene ◽  
Temperate Forest ◽  
Vegetation Succession ◽  
Tectonic Activity ◽  
Forest Steppe ◽  
Pollen Record ◽  
Humid Climate ◽  
Northeastern Tibetan Plateau ◽  
Global Cooling

Abstract. Holding a climatically and geologically key position both regionally and globally, the northeastern Tibetan Plateau provides a natural laboratory for illustrating the interactions between tectonic activity and the evolution of the Asian interior aridification. Determining when and how the late Miocene climate evolved on the northeastern Tibetan Plateau may help us better understand the relationships among tectonic uplift, global cooling and ecosystem evolution. Previous paleoenvironmental research has focused on the western Longzhong Basin. Late Miocene aridification data derived from pollen now require corroborative evidence from the eastern Longzhong Basin. Here, we present a late Miocene pollen record from the Tianshui Basin in the eastern Longzhong Basin. Our results show that a general trend toward dry climate was superimposed by stepwise aridification: a temperate forest with a rather humid climate existed in the basin between 11.4 and 10.1 Ma, followed by a temperate open forest environment with a less humid climate between 10.1 and 7.4 Ma, then giving way to an open temperate forest–steppe environment with a relatively arid climate between 7.4 and 6.4 Ma. The vegetation succession demonstrates that the aridification of the Asian interior occurred after  ∼  7–8 Ma, which is confirmed by other evidence from Asia. Furthermore, the aridification trend on the northeastern Tibetan Plateau parallels the global cooling of the late Miocene; the stepwise vegetation succession is consistent with the major uplift of the northeastern Tibetan Plateau during this time. These integrated environmental proxies indicate that the long-term global cooling and the Tibetan Plateau uplift caused the late Miocene aridification of the Asian interior.

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