Sedimentary Types of Internal-Wave and Internal-Tide Deposits of Middle Ordovician, Xujiajuan Formation, Xiangshan Group, Ningxia Autonomous hemas-microsoft-com:office:smarttags" />Region, China

详细信息   

• 责任者：Li Xiangdong (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; He Youbin
• 刊名：Advances in Earth Science
• 出版年：2011
• 卷期：26(9)
• 关键词：内波 ; internal waves ; 内潮汐 ; internal tides ; 沉积构造 ; sedimentary structure ; 宁夏 ; Ningxia
• 页码：p.1006-1014
• 图表：3 illus., 49 refs.
• 分类号：0803
• issnNo：ISSN1001-8166
• isbnNo：CN62-1091/P

摘要

 The study of internal-wave and internal-tide deposits is a very young research field with twenty years of history in the deep-water deposition,and there is no study on its sedimentary types.Here,we forcus on the internal-wave and internal-tide deposits developed in Xujiajuan Formation,Xiangshan Group,Ningxia Autonomous Region and describe related sedimentary structures in detail.We interpret combined-flow-ripple lamination and the cross beddings with undulatory laminations,offshooting laminations and cross-laminated lenses as combined-flow and oscillatory flow generated by short-period internal waves respectively.According to these new interpretations and the interpretations of deep-water bidirectional cross-beddings and unidirectional cross-beddings in literatures,we attribute internal-wave and internal-tide deposits to short-period internal-wave deposits,internal-tide deposits and interaction internal-wave deposits.Here,we use internal-wave and internal-tide deposits instead of internal-wave deposits because of the special origin and research status of internal tides.