New PDF release: Sequence Stratigraphy and Facies Associations: IAS Special

By Henry W. Posamentier

ISBN-10: 063203548X

ISBN-13: 9780632035489

In recent times there was a digital explosion of stratigraphic stories using the foundations of series stratigraphy. even if the concept that of time stratigraphy isn't really new, the packaging of depositional devices into structures tracts and sequences is. This new procedure has resulted in the reassessment of parts that during a few circumstances were the topic of severe geological scrutiny for many years. the basic rules upon which series stratigraphy is predicated are acceptable at a vast variety of temporal and actual scales. This quantity arises from numerous periods on series stratigraphy held on the 13th overseas Sedimentological Congress, with emphasis on facies institutions inside of a series stratigraphic framework.

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Additional resources for Sequence Stratigraphy and Facies Associations: IAS Special Publication 18

Sample text

The shelf margin wedge and highstand systems tracts occupy positions nearly from inflection point tb inflection point on the sea-level curve. The type 2 sequence boundary occurs at the falling inflection point of the sea-level curve and the transgressive systems tract occupies only a short interval at the inflection point associated with the maximum rate of sea-level rise. This implies that systems tracts in the model are responding to the rate of sea-level change. The type 1 sequences vary depending on the amplitude of sea-level fluctuation relative to the subsidence rate and sediment supply.

Helland-Hansen et a!. (1988) used their strati­ graphic model to simulate the unsealed archetypical diagrams from Vail et a!. (1984). To do this with sea-level curves similar to Vail et a!. (1984), they needed to vary significantly the sediment flux and subsidence rate during the sea-level cycle. They found that their sequence boundaries fell near the maxima on their sea-level curve for type 1 and near the sea-level minima for type 2 sequence bound­ aries, both close to 90" off from the interpretation in Vail et al.

L l (f)) the shelf once again progrades, rapidly outbuilding over the now shallower ramp to a new depositional shelf break position near shotpoint 1600. This break-in-slope is not well imaged by USGS line 6 which crosses this middle Miocene shelf break obliquely. It is better seen in the seismic lines shown by Greenlee et al. (1988) further to the north. Examination of line 6 and the line in Green­ lee et al. (1988) shows that this pattern of stagnation of the shelf break coupled with bypass followed by rapid progradation seaward is repeated three times in the Miocene of the New Jersey shelf.

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Sequence Stratigraphy and Facies Associations: IAS Special Publication 18 by Henry W. Posamentier


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