Metamorphic history

Metamorphic data is important for understanding many geological processes. Measuring the pressure, temperature, and time (P–T–t) conditions that metamorphic rocks have experienced helps us learn more about how rocks and the Earth itself have changed over time.

Last updated: 25 March 2025

Most rocks in Western Australia have changed over time. Metamorphism is the process where rocks change due to changes in pressure (P), temperature (T), or chemicals from fluids caused by geological events. These changes help show what was happening in the Earth at the time, such as the forces that caused change.

When pressure, temperature, and fluids change, the minerals in rocks also change. This results in new combinations of minerals, which we can study to learn about the conditions that caused these changes. This information helps us understand major processes, like plate movements, that shaped our State.

To get better information from metamorphic rocks, we use advanced techniques like phase equilibria modelling, which gives more accurate details about pressure and temperature. We also combine this with information about the age and chemistry of certain minerals to get a clearer picture of the rock’s history. By studying these details, we can learn about past events like how deep the rocks were buried, how they were heated, and how they were brought back to the surface. This helps us understand the forces that shaped Western Australia over time.

To access metamorphic data, including pressure (P), temperature (T), rock types and diagnostic mineral assemblages, age, and other details, visit GeoVIEW.WA. The Metamorphic History dataset is available for download from the Data and Software Centre.