Obliquity-forced climate during the Early Triassic hothouse in China

Mingsong Li, Chunju Huang, Linda Hinnov, James Ogg, Zhong Qiang Chen, Yang Zhang

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

The start of the Mesozoic Era is marked by roughly 5 m.y. of Earth system upheavals, including unstable biotic recovery, repeated global warming, ocean anoxia, and perturbations in the global carbon cycle. Intervals between crises were comparably hospitable to life. The causes of these upheavals are unknown, but are thought to be linked to recurrent Siberian volcanism. Here, two marine sedimentary successions at Chaohu and Daxiakou (South China) are evaluated for paleoclimate change from astronomical forcing. In these sections, gamma-ray variations indicative of terrestrial weathering reveal enhanced obliquity cycling over prolonged intervals, characterized by a 32.8 k.y. periodicity with strong 1.2 m.y. modulations. These suggest a 22 h length of day and 1.2 m.y. interaction between the orbital inclinations of Earth and Mars. Comparing the 1.2 m.y. obliquity modulation cycles in these sections with Early Triassic records of global sea level, temperature, redox, and biotic evolution suggests that long-term astronomical forcing was involved in the repeated climatic and biotic upheavals that took place throughout the Early Triassic.

Original languageEnglish (US)
Pages (from-to)623-626
Number of pages4
JournalGeology
Volume44
Issue number8
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Geology

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    Li, M., Huang, C., Hinnov, L., Ogg, J., Chen, Z. Q., & Zhang, Y. (2016). Obliquity-forced climate during the Early Triassic hothouse in China. Geology, 44(8), 623-626. https://doi.org/10.1130/G37970.1