Mira Bar-Matthews is a prominent researcher at the Geological Survey of Israel. In 2026, she received the Israel Prize in Geology and Earth Sciences for her groundbreaking studies on past climates.
Bar-Matthews has specialized in cave formations, particularly stalactites and stalagmites. These natural structures act like time capsules, preserving records of climate and even seismic activity over thousands of years. As climate change affects our world today, understanding these ancient climates helps us make sense of our future.
Her work illustrates how these cave deposits can reveal insights into ancient earthquakes and environmental changes. Using advanced techniques, her team has pieced together the history of the Mediterranean and the Middle East, linking geological formations to climate conditions.
Bar-Matthews grew up in Jerusalem and started her geology studies in 1969 at the Hebrew University. From there, she began her career at the Geological Survey of Israel. Her research looks into how water interacts with rocks, particularly in the creation of carbonate deposits. Carbonate compounds, like calcium carbonate found in limestone, are crucial in tracking geological history.
Interestingly, carbonate rocks can form through different processes. In the ocean, marine organisms create calcium carbonate shells, which later build up layers to form rock. On land, water combines with carbon dioxide from the atmosphere, creating weak acid that dissolves minerals in rocks. When environmental conditions shift, these minerals crystallize to form stalactites and other deposits.
The isotope ratios in these carbonate deposits tell a story of past climatic conditions. Isotopes are variations of elements, differing in the number of neutrons. In stalactites, researchers often analyze oxygen isotopes—like oxygen-16 and oxygen-18—to understand temperature and rainfall patterns over time.
In the early 1990s, Bar-Matthews and her colleague Dr. Avner Ayalon began analyzing cave formations in Soreq Cave near Jerusalem. This cave was about to open for public tours, and the Geological Survey aimed to preserve its unique features. They found growth rings in stalactites, much like those in trees, which indicated varying environmental conditions over time.
Her research culminated in two pivotal papers published in the 1990s, establishing the connection between stalactites’ isotopic composition and surrounding climate conditions. Follow-up studies revealed that stalactites from Soreq Cave provide a detailed climate archive, documenting changes during glacial and interglacial periods.
The dating method used by Bar-Matthews measures uranium decay in stalactites. This allows scientists to determine when specific layers formed, even dating back tens of thousands of years. This technology has made Soreq Cave one of the most crucial sites for paleoclimate research globally.
In recent years, Bar-Matthews has expanded her research to include paleoseismology, revealing insights into past earthquakes through the physical changes in stalactites. This collaboration highlights just how interconnected climate and geological activity are.
Reflecting on her journey, Bar-Matthews has faced skepticism but maintained her belief in the importance of her work. Today, her research stands as a foundation for understanding climate change, illustrating the intricate history captured in the Earth’s layers.
The insights gained from these ancient formations provide invaluable context in our ongoing struggle against climate change and its impacts on society. In an age of uncertainty, Bar-Matthews encourages the next generation to appreciate the puzzle of Earth sciences, where each discovery adds a piece to our understanding of the world.
For more in-depth research on climate archives, consider exploring the U.S. Geological Survey or recent studies on paleoclimate investigations.
