摘要
在地质演化的漫长历史过程中,西藏地区留下了相当完整的海相白垩纪地层。对该时期海相沉积演化特征的研究,能够为该地区在印度板块和欧亚板块碰撞前的演化信息提供可靠的依据。文章以西藏拉萨市林周盆地为研究区域,以沉积作用的过程和方式为研究方法,对林周盆地地层进行分析的基础上,对该地区采集到的古生物化石进行分类以及对比分析。认为,西藏拉萨市林周盆地具有温暖湿润的古环境信息,且该区域白垩纪时期古地理环境是浅海环境,地史演化具有明显的海陆变迁特征。文章研究对林周盆地在白垩纪时期基本地理环境的推断和青藏高原在这一时期海进海退的地质构造演变理论的进一步研究具有促进作用。
During the long history of geologic evolution,a fairly complete Cretaceous strata of the marine facies has been left in Tibet area.The study on the evolution characteristics of marine facies in this period can provide a reliable evolution information of this area before the collision of the Indian plate and Eurasian plate.Taking the Linzhou Basin in Lhasa Tibet as the research area,and taking the process and mode of sedimentation as the re-search method,this paper classifies and analyses the ancient fossils collected from the Linzhou basin,based on the analysis of the strata in this area.It is believed that Linzhou basin in Lhasa has the warm and humid paleoenvironmental information,and the Paleo-geographical environment in the Cretaceous Period is shallow water environment.Moreover,the geologic evolution of this area shows obvious characteristics of sea-to-land change.The study on basic geographical environment of the Linzhou basin in the Cretaceous period has significant impli-cation on further study of the geologic tectonic evolution theory regarding marine transgression and marine regres-sion on the Qinghai-Tibet Plateau during the same period.
作者
土登次仁
李兴鹏
朱卫翁
央珍
边片
Thupten-Tsering;LI Xing-peng;ZHU Wei-weng;Yangdron;Penphan(School of Science,Tibet University,Lhasa 850000,China)
出处
《高原科学研究》
2018年第2期12-17,共6页
Plateau Science Research
基金
西藏自治区大学生创新性实验训练计划项目(2014QCX023)
关键词
林周盆地
海相
白垩系
化石
Linzhou Basin
Marine Facies
cretaceous
fossils
