Stage Analysis on the Soft-Sediment Deformation in the Early Cretaceous Flysch, Lingshan Island, Shandong Province
详细信息
- 责任者：Dong Xiaopeng (School of Geosciences ; China University of Petroleum ; Qingdao 266580 ; China) ; Lü Hongbo
- 刊名：Geological Review
- 出版年：2013
- 卷期：59(6)
- 关键词：软沉积物变形 ; soft sediment deformation ; 复理石 ; flysch ; 山东 ; Shandong Province
- 页码：p.1060-1067
- 图表：7 illus., 1 plate, 30 refs.
- 分类号：0803
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
The Early Cretaceous flysch found in the Lingshan Island,Shandong Province,was formed in a remnant ocean basin. There are abundant slump deposit beds found in this flysch,indicating frequent strong earthquake events happened in the Early Cretaceous. There are different soft sediment deformation structures found in the slump beds,such as slump folds,sole casts,X-type conjugate thrust faults,synsedimentary boudinages,sand blocks and balls,mini hosts and grabens,imbricate reverse folds etc. Different types of soft sediment deformation structures show their different deformation stages compared to the slump deposition events. Taking the slump deposit outcrop section nearby the shipyard as an example,we have analyzed the mechanism of the soft sediment deformation structures,and classified these structures into three groups according to their formation period: the structures developed before slump,during the slump and after the slump. Some of the soft sediment deformation structures formed during the slump event can be used to identify the slump direction,whereas the structures developed before the slump,due to the long distance transportation of slump beds,cannot be used as the indicators of slump direction.
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