Different Cooling Histories of Ultrahigh-Temperature Granulites Revealed by Ti-in-Quartz: An Electron Microprobe Approach

The cooling history of granulite is crucial to understanding tectonic scenarios the continental crust. Ti-in-quartz, a useful indicator temperature, can decipher thermal evolution crustal rocks. Here we apply Ti-in-quartz (TitaniQ) thermometer ancient ultrahigh-temperature (UHT) granulites from Khondalite Belt (KB) in North China Craton (NCC) and young UHT Mogok Metamorphic (MMB), Myanmar. Ti content quartz was analyzed using highly precise method constructed CAMECA SXFive electron probe microanalyzer (EPMA). two localities show different contents with constant deforced beam 10 μm. Matrix inclusions NCC have 57–241 ppm 65–229 ppm, respectively, corresponding TitaniQ temperatures 653–810 °C 666–807 °C. calculated are significantly lower than peak (850–1096 °C) obtained by other methods, due formation abundant rutile exsolution rods during cooling. Thus, low for reflect state near or after quartz, most likely caused slow process. However, matrix MMB exsolution-free records higher 207–260 metamorphic 894–926 °C, close conditions. This feature indicates that underwent rapid overcome loss quartz. Therefore, determining amount diffusion provide new insight into behavior granulites. When large 50 μm used cover rods, KB could also yield above 900 our data suggest be revealing