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。
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.
出处
《地质通报》
CAS
CSCD
北大核心
2003年第10期775-781,共7页
Geological Bulletin of China
基金
国土资源部国际合作与科技司科研项目(编号:2000305)
国家自然科学基金委员会重点项目(编号:40032010-C)
中国地质调查局综合研究项目(编号:200113900070)
