| Northeast(NE) Jiangxi is in the hinterland of south China. Its tectonic place is in the east section of the Jiangnan orogenic belt(the Neoproterozoic arc-continent collision orogenic belt), and southeast(SE) of the Yangtze block, and north edge of the Jiangshao fault zone. Mesozoic magmatic activities are intense in southeast(SE) China. This study conducted zircon U–Pb dating and obtained bulk rock geochemical data from four granitic plutons in the east–west-trending granite belt of NE Jiangxi, southeast(SE) China. Laser ablation inductively coupled plasma mass spectrometry was used to analyze zircon U–Pb, and this test yielded consistent results at ages of 130–135 Ma, which indicated that the plutons were formed during the early Cretaceous period. Geochemical results demonstrated that all the plutons in this belt belonged to A-type granites and were derived from crust and part of the mantle through lithospheric thinning and magma upwelling. Furthermore, the oxygen fugacity of the samples was low, which suggested that the granite belt was formed in a reduced environment. This belt also exhibited characteristics that are similar to those of the early Cretaceous granites from the southern Anhui Province, which implies that these granites were all formed during the same magmatic event. Our results provide further evidence to constrict the SE China environment transformation period from compression to extension. |
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