Orbital Forcing and Sea-Level Changes in the Earliest Triassic of the Meishan Section, South China

• Published in: Journal of earth science (Wuhan, China) China), 2014-02, Vol.25 (1), p.64-73
• Main Authors: Tian, Shifeng, Chen, Zhong-Qiang, Huang, Chunju
• Format: Article
• Language: English
• Subjects: Biogeosciences; Bundles; Carbonates; China; Climate change; Correlation; Earth and Environmental Science; Earth science; Earth Sciences; Eccentricity; Extinction; Fischer图解; Geochemistry; Geology; Geotechnical Engineering & Applied Earth Sciences; Limestone; Lithology; Mass extinctions; Orbitals; Paleoecology; Permian; Precession; Recognition; Sea level; Studies; Triassic; Wavelengths; 中国南方; 早三叠世; 早期; 海平面变化; 煤山剖面; 碳酸盐含量; 轨道
• ISSN: 1674-487X; 1867-111X
• DOI: 10.1007/s12583-014-0400-3

The Earliest Triassic Yinkeng Formation is exposed at the well-known Meishan Section, South China, which contains the Global Stratotype of Section and Point （GSSP） for the Permian- Triassic boundary （PTB）. It records centimeter-scale rhythmic alternations comprised mainly by marl- stone and limestone. Seven types of couplet embedded in five types of bundles were recognized based on occurrence and thickness of the lithologic units, suggesting that their formation was controlled by cyclic processes. The various orders of cycles observed correlate well with other Early Triassic counterparts recorded in South China. Here, we present new cyclostratigraphic results based on lithologic thickness and relative carbonate content of the Yinkeng Formation. Power spectra of carbonate content show that the ratio of major wavelengths recognized throughout the formation is similar to that of the 100 kyr short eccentricity, 33 kyr obliquity, and 21 kyr precession cycles, indicating that astronomical sig- nals are recorded in the Earliest Triassic rhythmic succession. Consistence between pronounced lithologic rhythmicity and sea-level changes obtained from Fischer plots indicates that high-frequency climatic cycles may have driven sea-level changes immediately after the PTB mass extinction. Fur- thermore, the 4th-order sea-level changes interpreted from the sedimentary record match well with 100 kyr short eccentricity component of carbonate content, reflecting that the 100 kyr short eccentricity- induced climate changes may have likely controlled the deposition of 4th-order sequences recognized from rhythmic successions.