Stratigraphic and Structural Characteristics of Lile Basin in Nansha Area
详细信息
- 责任者：Sun Longtao (South China Sea Institute of Oceanology ; Chinese Academy of Sciences ; Guangzhou 510301 ; China) ; Sun Zhen
- 刊名：Geotectonica et Metallogenia
- 出版年：2008
- 卷期：32(2)
- 关键词：中生代 ; Mesozoic ; 新生代 ; Cenozoic ; 构造分析 ; structural analysis ; 南沙群岛 ; Nansha Islands
- 页码：p.151-158
- 图表：8 illus., 25 refs.
- 分类号：1200
- issnNo：ISSN1001-1552
- isbnNo：CN43-1595/P
摘要
The Lile Basin, located in the north of the Nansha block, is a complicated superposition basin, which underwent four tectonic phases. Through seismic reflection profiles, drilling and dredge sample analysis, the authors believe there develop Mesozoic and Cenozoic marine strata in this area. The sedimentary strata are divided into three structural layers by two territorial uncomformable surfaces, which are Late Cretaceous and Mid-Miocene interfaces respectively. The infrastructural layer is the thick Mesozoic sediments, and presents tilting fault blocks and broad fold structure modes. The middle layer is thin Palaeocene-Mid-Miocene rift sediments, locally absent in the uplift area, displaying the typical half graben sedimentary filled by. The upper layer, filled by local subsidence marine sediment, is continuous and steady.