阿拉善地块东部古元古代泥质片麻岩的变质作用与年代学研究

Key Points

• This research focuses on the metamorphic evolution and geochronology of Neoproterozoic mud gneiss in the Alashan block.
• Field geological surveys
• Petrological observations
• Mineral chemical analysis
• Phase equilibrium modeling
• In-situ zircon and monazite geochronology
• Mud gneiss samples indicate medium-pressure metamorphism with high Al2O3 and low SiO2 characteristics.
• Peak conditions of metamorphism are approximated at 800-850℃ and 0.8-1.0 GPa.
• Zircon U-Pb ages show continuous evolution characteristics, with some ages aligning with peak metamorphism around 1.92 Ga.
• Found significant indicators of a tectonic relationship with the North China Craton.