Fluids circulating underground change rocks over the course of time. These processes must be taken into account if they are to be used as a climate archive. In collaboration with international colleagues, Dr. Mathias Müller from the Sediment and Isotope Geology research group at Ruhr University Bochum, Germany, has used 380-million-year-old limestones from Hagen-Hohenlimburg to show in detail which climate information is still preserved in the rock. What’s more, his analyses allow him to draw conclusions about how suitable the rock is today for deep geothermal use. ...
