Sequence Stratigraphy and Paleogeography of Carboniferous in the South of oft-com:office:smarttags" />Guizhou Sag , China
详细信息
- 责任者：Ma Zhiluan (Institute of Sedimentary Geology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Dan Yong
- 刊名：Journal of Chengdu University of Technology
- 出版年：2011
- 卷期：38(5)
- 关键词：层序地层学 ; sequence stratigraphy ; 岩相古地理 ; lithofacies paleogeography ; 石炭纪 ; Carboniferous ; 贵州 ; Guizhou Province
- 页码：p.494-499
- 图表：illus., 1 table, 16 refs.
- 分类号：1200
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
The Carboniferous strata are extensively distributed in the south of the Guizhou sag.They have the characteristics of clear stratigraphic division and correlation,plentiful sediment types and better outcrops.It is suitable to make the sequence stratigraphy research in these areas.Based on the outcrop sequence stratigraphy method,the Carboniferous is divided into two second order sequences and 12 third order sequences in the south of the Guizhou sag.Although the Carboniferous is all over in the sag interior,the lower 1st-3th sequences are eroded near the edge of the successive ancient land or in the shallow water on the depositional high land.The authors take the two second order sequences system tracts as the mapping units to draw 5 Carboniferous sequence-lithofacies paleogeography maps.The seawater is only limited to some low-lying areas and most of the region is exposed to the environment in LST during SS1.As the seawater intrudes into the north,the south of the Guizhou sag becomes alternately platform and basin in TST during SS1.HST inherits paleogeographic environment of TST during SS1.However,the shoreline has retreated from north to south,the platform range relatively expanded and basin becomes relatively narrow.Because the extensional movement are enhanced in the south of the Guizhou sag,the basin appears a branch of the "Y" shape,showing a complex paleogeographic environment in which platform and basin alternate in TST during SS2.The seawater has slowly retreated.However,the sedimentary environment remains unchanged in HST during SS2.
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