April’s ‘Paper of the Month’ comes from the Institute of Light and Matter (Université Claude Bernard Lyon 1 and French National Centre for Scientific Research (CNRS)), where the project was conceived by Professor Frédéric Caupin.
Rock minerals almost always contain Fluid Inclusions (FIs). These inclusions contain snippets of atmospheric and fluid data trapped at the time of the rock’s formation and thus have been used in the past as proxies to estimate the variability of the Earth’s surface temperature.
These fluid inclusions – upon cooling – can nucleate bubbles within the rock and it is these bubbles that can be studied to determine the ambient temperature at the time the fluid was trapped.
However this relies on the presence of the nucleation bubble, which is not always there. In this study, Professor Caupin’s group created a new approach which bypasses the need for this nucleation bubble. Their method follows the interaction between laser light and fluid droplets – Raman spectroscopy and Brillouin microscopy – from which paleothermometry data can be drawn.
This approach may provide a novel route to understanding the earth’s climatic history.