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宁夏香山群徐家圈组发现深水复合流沉积构造
投稿时间:2009-03-15  修订日期:2009-08-03  点此下载全文
引用本文:李向东,何幼斌,郑昭昌,刘娜,王丹,罗进雄,李华.2010.宁夏香山群徐家圈组发现深水复合流沉积构造[J].地质学报,84(2):221-232.
Li Xiangdong,He Youbin,Zheng Zhaochang,Liu Na,Wang Dan,Luo Jinxiong,Li Hua.2010.Deep-water Sedimentary Structure of Combined-flow Origin from Xujiajuan Formation of Xiangshan Group, Ningxia[J].Acta Geologica Sinica,84(2):221-232.
DOI:
摘要点击次数: 2758
全文下载次数: 1982
附件
作者单位E-mail
李向东 长江大学地球科学学院 lixiangdong614@163.com 
何幼斌 长江大学地球科学学院  
郑昭昌 宁夏地质矿产局  
刘娜 长江大学地球科学学院  
王丹 长江大学地球科学学院  
罗进雄 长江大学地球科学学院  
李华 长江大学地球科学学院  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:宁夏香山群徐家圈组是由灰绿、黄绿色轻变质中-细粒砂岩、钙质砂岩及粉砂岩和页岩(板岩)组成的深水沉积。在上部灰绿色页岩所夹的中层钙质粉砂岩中发现了复合流层理、准平行层理、不对称小型丘状交错层理;在下部灰绿色厚层-块状中-细粒长石石英砂岩的顶面发现了小型波痕,波痕的形态、波长与波高的分布规律均表现出复合流的沉积特征。本文根据水槽实验和现代海洋沉积观测所总结出的复合流底床相图和前人在研究地层中较浅海浊流(超重流)与波浪所形成的复合流沉积时给出的复合流沉积示意图,分别对徐家圈组所发现的①小型2-D波痕至小型3-D波痕的演化和②复合流痕、平行层理、准平行层理和小型丘状交错层理的叠置关系及其纹层所反映的流动方向与沉积时浊流方向的关系,进行了解释。结果表明,所发现的复合流层理、准平行层理、不对称小型丘状交错层理及小型波痕应为复合流沉积,并依据徐家圈组存在内波沉积的事实,推测为深水高频内波与浊流形成的复合流沉积。这可能是地层中深水复合流沉积构造的首次发现,同时也是内波与浊流形成的复合流沉积的首次发现。
中文关键词:香山群  复合流  内波  沉积构造
 
Deep-water Sedimentary Structure of Combined-flow Origin from Xujiajuan Formation of Xiangshan Group, Ningxia
Author NameAffiliationE-mail
Li Xiangdong School of Geosciences,Yangtze University lixiangdong614@163.com 
He Youbin School of Geosciences,Yangtze University  
Zheng Zhaochang Ningxia Bureau of Geology and Mineral Resources  
Liu Na School of Geoscience, Yangtze University  
Wang Dan School of Geoscience, Yangtze University  
Luo Jinxiong School of Geoscience, Yangtze University  
Li Hua School of Geoscience, Yangtze University  
Abstract:Deep-water deposits in Xujiajuan Formation of Xiangshan Group is made up of gray-green, yellow-green, fine- to medium-grained sandstone, calcareous sandstone, siltstone and shale(slate)with slightly metamorphic. Combined-flow-ripple lamination and quasi-planar lamination and asymmetric small-scale hummocky cross stratification are found in medium beds calcareous siltstone interlayer in gray-green shale of the upper part, and the small-scale ripple marks which suggests the sedimentary characteristics of combined-flow in both their shapes and distribution of wave length and wave height are also found on the top surface of gray-green medium to thick feldspar-quartz sandstone of the lower part. In this paper, the interpretation of: (1) the evolution of small-scale 2-D ripple marks to 3-D ripple marks; and (2) the sequence of combined-flow ripple lamination, quasi-planar lamination and small-scale hummocky cross stratification as well as the relationship between the flow direction suggests by lamina of cross bedding and the turbidity current direction while deposited according to: (1) the combined-flow bed-phase diagram summarized from flume experiments and observation of modem marine deposit; and (2) the combined-flow deposition cartoon was given by previous researchers from the ancient deposition of combined-flow which is produced by hyperpycnal flows and waves in relatively shallow water. The result shows that the combined-flow ripple lamination and quasi-planar lamination and asymmetric small-scale hummocky cross stratification exist in Xujiajuan Formation are produced by combined-flow, and we interpret the combined-flow as a interaction of high frequency internal wave and turbidity current according to the deposition of internal wave. This perhaps is the first discovery of deep-water sedimentary structure of combined-flow origin as well as the combined-flow deposition produced by internal wave and turbidity current.
keywords:Xiangshan group  combined-flow  internal-wave  sedimentary structure
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