loading page

1.2-million-year band of Earth--Mars obliquity modulation on the evolution of cold late Miocene to warm early Pliocene climate
  • +6
  • Jie Qin,
  • Rui Zhang,
  • Vadim Kravchinsky,
  • Jean-Pierre Valet,
  • Leonardo Sagnotti,
  • Jianxing Li,
  • Yong Xu,
  • Taslima Anwar,
  • Leping Yue
Jie Qin
Northwest University, Northwest University
Author Profile
Rui Zhang
Northwest University, Northwest University

Corresponding Author:[email protected]

Author Profile
Vadim Kravchinsky
University of Alberta, University of Alberta
Author Profile
Jean-Pierre Valet
Institut de Physique du Globe de Paris, Institut de Physique du Globe de Paris
Author Profile
Leonardo Sagnotti
Istituto Nazionale di Geofisica e Vulcanologia, Istituto Nazionale di Geofisica e Vulcanologia
Author Profile
Jianxing Li
Chengdu Center of Geological Survey, Geological Survey of China, Chengdu Center of Geological Survey, Geological Survey of China
Author Profile
Yong Xu
Xi’an Center of Geological Survey, China Geological Survey, Xi’an Center of Geological Survey, China Geological Survey
Author Profile
Taslima Anwar
Northwest University, Northwest University
Author Profile
Leping Yue
Northwest University, Northwest University
Author Profile

Abstract

The climatic transitions during the Miocene–Pliocene epochs had significant impacts on the worldwide biological diversity and were associated with large turnovers of continental vegetation and fauna. Previous studies have shown that late Miocene cooling and continental aridification which was initiated 7 Ma reversed to warm conditions across the Miocene–Pliocene Boundary ~ 5.3 Ma. Here we present detailed orbital pacing of Asian monsoon deposits to constrain further the global climate change during this period. We produce high-resolution magnetic susceptibility records which reveal that the 1.2 Myr obliquity modulation would have been the main driving factor of the cooling and warming that occurred ~ 7 Ma and 5.3 Ma, respectively. The Tibetan rise and closures of the Panama and Indonesian seaways enhanced the impact of the 405 kyr eccentricity cycles to an oscillatory climatic state while the Northern Hemisphere glaciations were increasing from 4 to 2.5 Ma.
Apr 2022Published in Journal of Geophysical Research: Solid Earth volume 127 issue 4. 10.1029/2022JB024131