DOI: 10.1306/01241211046
Scopus记录号: 2-s2.0-84865369971
论文题名: Shelf-edge deltas along structurally complex margins: A case study from eastern offshore Trinidad
作者: Moscardelli L. ; Wood L.J. ; Dunlap D.B.
刊名: AAPG Bulletin
ISSN: 0149-1750
EISSN: 1558-9480
出版年: 2012
发表日期: 2012
卷: 96, 期: 8 起始页码: 1483
结束页码: 1522
语种: 英语
Scopus关键词: Columbus
; Continental margin
; Deepwater
; Depocenters
; Genetic interpretations
; Holocenes
; Key factors
; Pleistocene
; Relative sea level
; Sediment accumulation
; Sediment supply
; Seismic datas
; Seismic stratigraphic interpretation
; Sequence-stratigraphic interpretation
; Shallow depths
; Shelf break
; Shelf edges
; Stratigraphic intervals
; Systems tracts
; Trinidad
; Geometry
; Sea level
; Sediments
; Seismic response
; Seismic waves
; Stratigraphy
; Sedimentology
; accretionary prism
; basin fill
; continental margin
; depocenter
; depositional environment
; geomorphological mapping
; offshore structure
; Pleistocene-Holocene boundary
; sea level change
; seismic data
; sequence stratigraphy
; shelf break
; three-dimensional modeling
; Trindade
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: A 15,000-km 2 (5792-mi 2) three-dimensional seismic data survey that covers the shelf-slope transition of the eastern offshore Trinidad continental margin reveals the geometry and depositional history of the last maximum glacial lowstand shelfmargin succession. Despite the lack of well information at these shallow depths, the quality and continuity of the seismic data allow us to pursue a detailed seismic stratigraphic interpretation of the last lowstand margin succession. The basin-fill stratal architecture of the studied stratigraphic interval shows a great deal of lateral and vertical variability along the continental margin during the Pleistocene to Holocene. Three geomorphological elements controlled the character of the accommodation within the basin and were crucial in transporting, delivering, and storing sediment supply from shelf to slope areas: (1) the Columbus sedimentary pathway on the shelf, (2) bypass zones in the shelf-break region, and (3) deepwater depocenters. The location and geometry of these geomorphological elements within the basin are clearly controlled by underlying structures, transpressional to the north and gravity driven to the south. Migration of the paleo-Orinoco delta system across the shelf was also a key factor in defining the stratigraphic geometries that are observed within the shelf break. Development of shelf-edge versus outer-shelf deltaic systems on the continental margin was controlled by the nature of sediment supply at specific times, as well as by the availability of accommodation, although, to a lesser extent, to relative sea level fluctuations. The interpretation also showed that, for time-equivalent units, parts of the shelf-edge region could develop as an erosional margin (sediment bypass zones), whereas other parts of the shelf edge could behave as an accretionary margin (sediment accumulation). The sequencestratigraphic interpretation that was attempted in this work also demonstrated that the characteristics of systems tracts can abruptly change along strike in the shelf-edge region for timeequivalent units. These changes can be misleading if a genetic interpretation is pursued only on the basis of the definition of system tracts in the shelf-edge region without the consideration of a complete regional framework. Copyright © 2012. The American Association of Petroleum Geologists. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84865369971&doi=10.1306%2f01241211046&partnerID=40&md5=80b57692bc70ca1d3820c5663c777f75
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13320
Appears in Collections: 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
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Recommended Citation:
Moscardelli L.,Wood L.J.,Dunlap D.B.. Shelf-edge deltas along structurally complex margins: A case study from eastern offshore Trinidad[J]. AAPG Bulletin,2012-01-01,96(8)