Tibetan Oligocene adakitic granites sourced from metasedimentary rocks in thickened lower crust

Key Points

• Adakitic granites are sourced from metasedimentary rocks in the Tibetan lower crust, highlighting their geological significance.
• Trace element geochemistry indicates a complex source involving crustal thickening during the Oligocene period.
• Field studies and geochemical analysis provide insights into the petrogenesis of these granites in the region.
• The findings support theories of crustal evolution, suggesting significant tectonic processes in the Tibetan Plateau.