Extrapolating the Original Positions of Removed Onlap-Offlap Points Using a Piecewise-Constructed Model of Effective Stratal Thickness

ZHONG Guang fa; ZHOU Zu yi GENG; Jian hua

The shift of onlap-of flap points is a critical factor in sequence stratigraphic analysis and charting sea level curves.Onlap-off lap points, however, are easily removed due to tectonic uplift, eustatic sea level fall, and so on.How to recover the original positions of removed onlap and of flap points has still been a pending problem.In this paper, we presented a piecew ise-const ructed function model to depict the lateral changes of stratal thickness along a dip section.It is assumed that the thickness of a stratum decreases exponentially from its maximum tow ards basin margin, and thins linearly on areas adjacent to the onlap-offlap points.Using this model, the positions of removed onlap and of flap points can be extrapolated by fitting the thickness data in non-removal areas.This approach is used in the study of the Pliocene to Pleistocene strata on the no rthern Sunda Shelf, South China Sea, and the result sare to our satisfaction.

The Key Laboratory of Marine Geology of China Ministry of Education,Tongji University,Shanghai 200092

Received Date: 2002-11-11

Rev Recd Date: 2003-02-10

Publish Date: 2003-12-10

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Abstract: The shift of onlap-of flap points is a critical factor in sequence stratigraphic analysis and charting sea level curves.Onlap-off lap points, however, are easily removed due to tectonic uplift, eustatic sea level fall, and so on.How to recover the original positions of removed onlap and of flap points has still been a pending problem.In this paper, we presented a piecew ise-const ructed function model to depict the lateral changes of stratal thickness along a dip section.It is assumed that the thickness of a stratum decreases exponentially from its maximum tow ards basin margin, and thins linearly on areas adjacent to the onlap-offlap points.Using this model, the positions of removed onlap and of flap points can be extrapolated by fitting the thickness data in non-removal areas.This approach is used in the study of the Pliocene to Pleistocene strata on the no rthern Sunda Shelf, South China Sea, and the result sare to our satisfaction.

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Reference (7)

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Extrapolating the Original Positions of Removed Onlap-Offlap Points Using a Piecewise-Constructed Model of Effective Stratal Thickness

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