【摘要】 南秦岭耀岭河群以变质基性火山岩为主,夹少量酸性火山岩和碎屑岩。基性火山岩和凝灰岩的TIMS法锆石U-Pb同位素年龄分别为808Ma±6Ma和746Ma±2Ma,表明耀岭河群主体形成于南华纪,西峡-淅川一带所谓的“武当岩群”明显年轻于中元古代武当岩群,应该属于耀岭河群。耀岭河群大陆裂谷型火山岩是全球Rodinia超大陆在新元古代晚期南华纪裂解过程中的产物,反映秦岭造山带和Rodinia超大陆的形成演化密切相关。更多还原

【Abstract】 The Yaolinghe Group in the South Qinling orogen is composed dominantly of basic volcanic rocks with minor acid volcanic rocks and clastic rocks. The TIMS U-Pb zircon ages of basic volcanic rocks and tuff are 808±6Ma and 746± 2Ma respectively, demonstrating that the main part of the Yaolinghe Group formed in the late Neoproterozoic Nanhuan Period, and that the so-called "Wudang Group" occurring in the Xixia-Xichuan area is significantly younger than the genuine Mesoproterozoic Wudang Group-complex and should be part of the Yaolinghe Group. The volcanic rocks of continental rifting origin of the Yaolinghe Group were formed in the process of break-up of the supercontinent Rodinia in the late Neoproterozoic Nanhuaan Period, which reflects that the Qinling orogen is closely related with the evolution of the supercontinent Rodinia.更多还原