摘要
彭灌飞来峰群为龙门山飞来峰群之一部，外来系统地层包括Ｄ、Ｃ、Ｐ、Ｔ１，岩性主要为碳酸盐岩，原地系统有Ｔ３、Ｊ，岩性主要为含煤碎屑岩、泥岩。原地系统大构造简单，小构造复杂，外来系统各种构造极发育，结构面倾向北西，辗掩滑动面倾向南东，前人认为飞来峰群是印支运动或印支、喜马拉雅两期地壳运动水平挤压、推覆产物，根带来自龙门山以西。笔者据沉积岩碎屑粒经、成分，并结合前人资料，研究古地形、古气候和古水系，认为飞来峰群是新第三纪龙门山东坡上岩块发生蠕动的产物，根带来自龙门山顶盖。
Pengguan Nappe Outliers are a part of the Longmenshan Nappe Outliers. The strata of exotic block incude D, C, P and T1, whose main constitutent is carbonatite. The strata of autochthonous rock are T3 and J, which contain mainly clasolite, shale and coal. The big structure in the autochthonous rock is simple, but the small one is complex. The structures of different size, type and shape in the exotic block are wholly very developmental. The textural plane dips northwestern, but the slipping plane of the nappe structure dips southeastern. It was believed in the past that Pengguan Nappe Outliers are the product of the horizontal compression and push in the Yinzhi crustal movement or in the Yinzhi and Himalayan crustal movement. The Root-zone of nappe outliers came from the western region of the Longmenshan Mountain. After studying palaeotopography, palaeoclimate and palaeodrainage system based on the size and constituent of clasolite, and the data obtained by former geologists, the author believes that Pengguan Nappe outliers are the product of the creeping blocks on eastern slope of the Longmenshan during the Late Tertiary Period, and the root-zone came from the roof of the Longmenshan.
出处
《四川师范大学学报（自然科学版）》
CAS
CSCD
1994年第5期98-104,共7页
Journal of Sichuan Normal University（Natural Science）
关键词
飞来峰
蠕动
地壳运动
nappe outliers, creep, crustal movement
