摘要
在野外实地考察和追索的基础上,详细厘定了特提斯喜马拉雅带中段晚古生代以来火山岩的分布特点和迁移规律。结果表明,在特提斯喜马拉雅带中段晚古生代以来的地层系统中,从二叠纪→三叠纪→侏罗纪→白垩纪,共有11个层位含规模不等的火山岩,它们以透镜体、薄夹层或以块状玄武岩、玄武质安山岩等形式产出于不同地层系统中;从二叠纪→早中三叠世→晚三叠世→侏罗纪和白垩纪,具有由西向东、从南→北→南→北的迁移规律。这些火山活动的发现和厘定,对填补特提斯喜马拉雅带火山岩研究的空白,了解陆下岩石圈地幔和软流圈地幔之间的相互作用和新特提斯洋盆的形成演化都具有一定的指示意义。
Based on field investigation and tracing, the authors have defined in detail the characteristics of distribution and migration of volcanic rocks since the Late Paleozoic in the central segment of the Tethyan Himalayan belt. Volcanic rocks of differing scales are found in 11 horizons of Permian, Triassic, Jurassic and Cretaceous ages in the area. They occur as lenses and thin interbeds or as massive basalt and basaltic andesite in different stratigraphic systems and show the regularity of migration from west to east and from south→north→south→north. The discovery and definition of these volcanic activities has certain indicative significance in filling in the blank in the study of volcanic rocks of the Tethys Himalaya belt and gaining knowledge of the interaction between the lithospheric mantle and asthenospheric mantle and the initiation and evolution of the Neo-Tethys ocean basin.
出处
《地质通报》
CAS
CSCD
北大核心
2004年第7期645-654,共10页
Geological Bulletin of China
基金
973项目<印度与亚洲大陆主碰撞成矿带作用>(编号:2002CB412600)下属课题<成矿潜力评估与战略新区预测>(编号:2002CB412600)
中国地质调查局<青藏高原南部空白区基础地质调查与研究>(编号:1212010310102)
中国地质大学<岩石圈构造
深部过程及探测技术>教育部重
关键词
二叠纪→白垩纪
火山岩
分布特点
特提斯喜马拉雅带中段
藏南
Permian-Cretaceous
volcanic rocks
distribution characteristics
central segment of the Tethyan Himalaya belt
southern Tibet
