The Uplift Process Research Of Pluton In Mesozoic In Guangdong Province

For better understanding of the tectonic in non-collision(uplift-exhumation) and the thermal evolution history, also accumulating and providing an example, this research took Mesozoic typical pluton(Granite) that exposed in Guangdong as the objects of my work. The work includes field sampling and laboratory analysis, using Al-in-hornblende barometer determining the initial emplacement depth of rocks, fission track dating of apatite and zircon, apatite (U-Th)/He dating as the integrated system thermal methods, discussed the uplift rates and T-t evolutionary track of Mesozoic typical pluton in Guangdong. This research provided accumulation of examples on tectonic activity, evolutionary and tectonic features evolution from Mesozoic in Southern China.Based on these studies, following the major achievements:(1)Through field exploration, sampling and microscope analyzed on the selected rocks, constrained the tectonic and microscopic characteristics.(2)According to analysis of chemical components of hornblende, it was part of Calcium amphibole group, further classification (IMA78) were Magnesio-hornblende, Actinolite hornblende,Ferro-edemote hornblende,and Edenite; and calculated the initial rock emplacement depth in accordance with the hornblende Al~T content.(3)According Zircon, apatite (U-Th)/He age and thermal chronology of fission track dating of apatite on the selected rocks, the author discussed rock T-t plot, cooling rate, also through fission track dating and (U-Th)/He method, constrainted the cooling polt of zircon and apatite. Obtained the thermal evolution information of different rocks by the cooling rate and T-t track, and analyzed its tectonic significance.(4)Through the initial emplacement depth and crystallization temperature of pluton, combining their respective thermal chronology, analyzed their various stages of uplift(exhumation) and thermal evolution history.