Petrogenesis is a branch of geology that focuses on the origin and formation of rocks, particularly igneous, metamorphic, and sedimentary rocks. This field of study investigates the processes that lead to the formation of different types of rocks, including the sources of their constituent minerals, the conditions under which they formed, and the mechanisms that drive their geological evolution. Petrogenesis research often involves the analysis of mineral compositions, isotopic signatures, and geological structures to decipher the history of rock formation and evolution. This information can help geologists understand the tectonic processes, environmental conditions, and geodynamic factors that have shaped the Earth's crust over time.