Projects | Isotope Geochemistry - Wang Xianfeng

A new speleothem record  from the tropical Cerrado of Brazil (Angelica cave) is being processed for paleoclimatic reconstructions. ,using Uranium-Thorium (U/Th) dating for chronological constraints and oxygen isotopic values (δ18O) as a proxy for rainfall. The record is made of 18 U/Th dates and... Read more

This project is motivated by two interconnected scientific debates, that is, (1) to what extent that the recent fast warming in the tropical Indian Ocean is driven by anthropogenic greenhouse forcing, and (2) whether the warming has dominated the decline of the Indian summer monsoon (ISM) over... Read more

For this project we propose a multi-proxy (trace elements, water inclusion and carbonate δ18O) study on speleothems collected from sites along a SW-NE transect in a region dominated by the Indian monsoon. We will determine the degree to which the change in water isotope fractionation between the... Read more

The primary objective of this project is to measure Ba and Ba isotopes in the river waters and oceans of Southeast Asia in order to characterize and also understand the potential of using Ba isotopes as a productivity, run off and water mass mixing proxy. In this context, the first and foremost... Read more

Past Projects

Our knowledge of past sea-level change is largely relying on high-precision uranium/thorium disequilibrium dating on fossil corals. The gain or loss of U and Th nuclides apart from radioactive decay and ingrowth in corals, namely open-system behaviour, however, violates the radiometric dating... Read more

The Sumba fossil reef terraces along the northern coast of the island are used as benchmarks for sea-level reconstruction. However, both their ages and the tectonic structures that uplifted them are poorly constrained. We are revisiting the coral terraces in the island, in a joint effort... Read more

Any dramatic climate change in the tropical Indo-Pacific may threaten the livelihoods of more than half of the world’s population. The Isotope Geochemistry team is reconstructing past climate patterns to learn the ultimate mechanisms that drive regional climate change and to learn if human... Read more

The Asian-Australian monsoon is a dominant feature in our tropical climate. We plan to elucidate the monsoon’s predictability over 10 to 1000-year timescales. By pairing data from cave formations called speleothems with our climate models, we’re reconstructing the regional climate over the past... Read more

This project aims to systematically sample fossil and living corals from the Ramree and Cheduba islands, western Myanmar. Recently discovered Porities corals on uplifted terraces from the islands suggest that they mainly grew during the Medieval Climate Anomaly and Little Ice Age.

We plan... Read more

This is a pilot study to collect coral samples from uplifted terraces in Tiran Island, northern Red Sea. The island is located at the entrance of the Gulf of Aqaba, characterized by sequences of coral terraces even-­spaced in elevation up to ~500 m asl.

We hypothesize that the upmost... Read more