北淮阳新元古代基性侵入岩年代学初步研究

Geochronology of Neoproterozoic Mafic Intrusions in North Huaiyang Area

大别造山带北部北淮阳褶皱带中分布少量变质变形基性侵入体,错石U-Pb研究的初步结果表明,它们的形成时代是新元古代（78±18Ma）,与北大别杂岩带中TTG片麻岩的形成时代一致。它们不仅形成时代与北大别杂岩带中基性-超基性岩不同,而且表现出与北大别杂岩带中基性侵入体不一致的主量元素地球化学信息。

There are a few metamorphosed and deformed mafic intrusions in North Huaiyang area, the northernmost part of Dabie orogen. The U-Pb data presented in this paper show that they were formed in Neoprterozoic Era (784 ±18 Ma) , similar to the formation time of TTG gneisses in North Dabie terrain. Major elements in the intrusions are different from those in the mafic-ultramafic intrusions of North Dabie terrain.