About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 54 (1984)No. 1. (March), Pages 127-136

Filtering of Depositional Events and the Completeness of Sedimentary Sequences

Kevin D. Crowley

ABSTRACT

The preservation of depositional events in sedimentary sequences is investigated using a Monte-Carlo model in which sedimentation rates are constant and the magnitudes of the events follow a lognormal frequency distribution. The model indicates that sedimentation processes act as a stationary, low-pass filter that preserves an amplitude-distorted record of the depositional events imposed on the modern environment. This low-pass filter gives rise to two concepts of completeness of sedimentary sequences: (1) Preservation of time lines in sedimentary sequences, or temporal completeness; and (2) Preservation of depositional events in sedimentary sequences, or spatial completeness. The model suggests that as sedimentation rate decreases, (1) the number of time lines preserved decreases exp nentially and the completeness of the record of depositional events decreases linearly; and (2) low-Previous HitmagnitudeTop events are progressively eliminated from the record. The latter characteristic of the model, which arises because of the assumption of stationarity of the time series, may be in conflict with observations from real sedimentary sequences. A nonstationary component can be added to the model by taking into account other depositional variations that have been observed in modern environments.


Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24