Zhiquan Yin

PhD project title:

Stable Isotope Records of Neoproterozoic Cap Carbonates and the Reconstruction of Post-Glacial Environments

The project titled “Stable Isotope Records of Neoproterozoic Cap Carbonates and the Reconstruction of Post-Glacial Environments” aims to investigate the stable isotope characteristics within the carbonates that overlie the Neoproterozoic Sturtian and Marinoan glacial deposits. These carbonates, known as cap carbonates, are layers of carbonate rock that sit atop glacial sediments, signifying the end of glacial periods and the beginning of rapid climate warming. Their formation is linked to environmental changes that occurred following glacial retreat. This study will integrate knowledge and data from sedimentology and geochemistry to unveil the complex events of oceanographic and climatic changes that took place during and after these significant glaciations. By analyzing δ13C and δ18O records, the project seeks to reconstruct the paleoenvironmental conditions of the Neoproterozoic world, offering insights into Earth’s recovery from global glacial events.

To date, no convincing scenario has been presented for the global deposition of cap carbonates, and this study will also evaluate various models concerning their formation. Through a critical analysis of previous assumptions, the project will endeavor to propose more rigorous and innovative interpretations and hypotheses for the changes during this pivotal period in Earth’s history. This will enhance our understanding of Earth’s climatic history, the mechanisms of environmental changes on the Earth’s surface, and their impact on the biosphere. Additionally, exploring the mechanisms of cap carbonate formation will further stimulate the exploration of other similar events in Earth’s history, progressively improving our comprehension of the Neoproterozoic Earth system.

Resources:

• Email:zhiquan.yin.21@ucl.ac.uk
• Supervisors:  Prof Graham Shields