deposit_your_work

Sequence stratigraphy of the Middle to Upper Jurassic, Viking Graben area, North Sea

Files in this item

Files Size Format View
9514231.PDF 17.53Mb application/pdf Thumbnail

Show simple item record

Item Metadata

dc.contributor.advisor Vail, Peter R.
dc.creator Sneider, John Scott
dc.date.accessioned 2009-06-04T00:02:51Z
dc.date.available 2009-06-04T00:02:51Z
dc.date.issued 1994
dc.identifier.uri http://hdl.handle.net/1911/16776
dc.description.abstract The Middle to Upper Jurassic in the Viking Graben area was deposited during an overall transgression. Tectonics, eustasy, sediment supply and sediment source area control facies distribution. The Lower Toarcian to the base of the Cretaceous consists of seven major regressive-transgressive facies cycles. These regressive-transgressive (R-T) facies cycles are called second order and dominate facies distribution. Two maximum flooding surfaces bound a facies cycle which contains an unconformity internally. The first three cycles occur during a minor rift phase (Rift Phase 1) and the second four during a major rift phase (Rift Phase 2). The regressive phase of the second order cycles appears to correspond to periods of high fault displacement; however, the eustatic effect on these cycles is unclear. Each second order facies cycle is associated with a change in depocenters. Most major seismic discontinuities are tectonic in origin. Shelfal areas and local highs are often eroded during a second order regression and the deposition is shifted to the basin center. During transgression, deposition is more widespread; shallow marine sandstones often develop on the margins of the graben. The paleobathymetric profile created by regional and local tectonics dictates facies types. Maps and seismic profiles of Rift Phase 1 indicate that the relatively simple tectonics led to uniform sediment and facies distribution. During Rift Phase 2, the development of numerous sub-basins creates heterogeneous facies distribution. Fault escarpments prevent progradation into the graben; sediments accumulated on the edge of fault escarpments fail and are redeposited as gravity deposits at the base of the escarpment. The seven second order cycles are subdivided into fourteen minor facies cycles that are called third order cycles. These cycles can be bound by either unconformities forming sequences or maximum flooding surfaces forming regressive-transgressive facies cycles. The cause of third order facies cycles is unclear. Third order cycles are more sensitive to sediment supply. Source area dictates sediment types. Uplift and erosion of Paleozoic and Triassic sandstones yield sand-rich sediments, while erosion of Caledonian schist yields shale-rich sediments.
dc.format.extent 374 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject Geology
Geophysics
dc.title Sequence stratigraphy of the Middle to Upper Jurassic, Viking Graben area, North Sea
dc.type.genre Thesis
dc.type.material Text
thesis.degree.discipline Geophysics
thesis.degree.discipline Geology
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
dc.identifier.citation Sneider, John Scott. (1994) "Sequence stratigraphy of the Middle to Upper Jurassic, Viking Graben area, North Sea." Doctoral Thesis, Rice University. http://hdl.handle.net/1911/16776.

This item appears in the following Collection(s)