Archean crustal terranes are commonly featured with the dome–and–keel structures,in which supracrustal rocks occur as belts(greenstones)between,and rafts within,dome-like bodies of tonalite–trondhjemite–granodiori...Archean crustal terranes are commonly featured with the dome–and–keel structures,in which supracrustal rocks occur as belts(greenstones)between,and rafts within,dome-like bodies of tonalite–trondhjemite–granodiorite(TTG).Supracrustal rafts within TTG gneisses generally record metamorphic grades ranging from amphibolite-to ultra-high temperature(UHT)granulitefacies of low-to moderate-pressure conditions[1].Notably,granulite-facies rafts commonly show counterclockwise P±T paths involving a significant increase in pressure at high temperatures[2,3].However,the tectonothermal drivers behind such metamorphism are still debated.展开更多
基金supported by the National Natural Science Foundation of China (42102062, 42030304, and 41890834)funding from the State Key Laboratory for Geological Processes and Mineral Resources, China University of Geosciences, Wuhan (Open Fund GPMR201903)from the Australian Government through an Australian Research Council Discovery Project (DP200101104)
文摘Archean crustal terranes are commonly featured with the dome–and–keel structures,in which supracrustal rocks occur as belts(greenstones)between,and rafts within,dome-like bodies of tonalite–trondhjemite–granodiorite(TTG).Supracrustal rafts within TTG gneisses generally record metamorphic grades ranging from amphibolite-to ultra-high temperature(UHT)granulitefacies of low-to moderate-pressure conditions[1].Notably,granulite-facies rafts commonly show counterclockwise P±T paths involving a significant increase in pressure at high temperatures[2,3].However,the tectonothermal drivers behind such metamorphism are still debated.
