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Mesozoic magmatism in Macao: What is known so far and future developments, by Dr. Pedro Quelhas
April 22, 2017 @ 11:00 AM - 11:30 PM UTC+0
Dr. Pedro Quelhas
(ISE-USJ and FCUL)
Pedro Quelhas graduated in geology from the Faculty of Sciences of the University of Lisbon (FCUL) and is currently a PhD student in the Institute of Science and Environment from USJ, where he is developing his research work on the petrology and geochemistry of Igneous Rocks from Macao: Implications for the Crustal Evolution of Southern China, funded by FDCT in Macau. His main interests are focused on igneous petrology, geochemistry and mineralogy. Before being enrolled in the PhD program he also did small research works on petrographic and geochemical features of the Lisbon Volcanic Complex and the dykes from Sines Massif, in Portugal. He was also lecturer at the Geology Department of FCUL.
About the talk
Although small in area (~30 Km2), our data shows that Macao territory has a wide range of granitic facies intruded by subordinate intermediate to acid dykes. Textural, mineralogical and geochemical variability of these rocks suggests different degrees of magmatic evolution in which fractional crystallization played a major role. Previous ages determined for Macao granites (Jurassic to Cretaceous) and their petrographic and geochemical features are similar to many granites occurring in neighboring areas, pointing to a genetic association with the Late Mesozoic magmatism related with the Yanshanian Orogeny. However, it is still not clear with the available data if these rocks were generated in the same magmatic event and/or derived from the same source. Isotopic data are now being acquired and precise dating of the different magmatic units will be undertaken soon, which will provide more answers for the local and regional magmatic history.