华北陆块东南缘徐淮地区侵位于元古代不同层位地层中辉绿岩的系统年代学、岩石地球化学和锆石Hf同位素的研究结果表明,辉绿岩中锆石发育弱的振荡环带,具有高的Th/U比值(0.91~6.90),指示锆石为岩浆成因.锆石SHRIMPU-Pb和Q-ICP-MSU-Pb定年结果显示,该区绝大多数辉绿岩的侵位结晶年龄为890Ma,即其形成于新元古代的早期.辉绿岩属于板内玄武岩系列岩石,总体上略富集轻稀土元素(LREE)、富集大离子亲石元素(LILE)Rb,Ba,La,略亏损高场强元素(HFSE)Th,Nb,Ta,Zr,Hf等,相对富集Cr和Ni;具有较高的εHf(t)值(2.26~14.74),其单阶段模式年龄tDM1=843~1321Ma、两阶段模式年龄tDM2=808~1779Ma.综合研究暗示辉绿岩的原始岩浆起源于中元古代时期的过渡型地幔,形成于华北陆块东南缘的板内陆缘伸展环境,华北陆块东南缘存在新元古代早期的构造-岩浆活动事件. Phylogenetics, geochemical and zircon Hf isotope studies of diabase from the Xujiahe southeastern margin of the Huabei terrane in different layers of the Proterozoic show that zircons in the diabase are weakly oscillating , With a high Th / U ratio (0.91 ~ 6.90) indicating that zircon is a magmatic origin.The zircon dating of SHRIMPU-Pb and Q-ICP-MSU-Pb shows that most diabase emplacements The age is 890Ma, that is, it formed in the early Neoproterozoic. Diabase belongs to the intraplate basalt series of rocks, and is generally enriched in LREE, enriched in LILE Rb, Ba, La slightly depleted in HFSE Th, Nb, Ta, Zr, Hf, etc., relatively enriched in Cr and Ni, with high εHf (t) values ​​of 2.26-14.74. The single- = 843 ~ 1321Ma, and the two-stage model age tDM2 = 808 ~ 1779Ma. Comprehensive studies suggest that the diabase originated from the transitional mantle of the Mesoproterozoic Proterozoic formed in the inland boundary of the southeastern margin of the North China continent, Early Neoproterozoic tectono-magmatic events occurred in the southeastern margin of the North China continent.