Pliocene-Pleistocene depositional sequences of the northern Gulf of Mexico, offshore Texas and Louisiana

Abstract

This work tests the consistency of sequence stratigraphic methods by comparing the model documented in this study with previous models for growth faulted, siliciclastic environments. Interpretations derive from sequence stratigraphic analysis of high quality seismic integrated with well control and detailed biostratigraphy. Hierarchic cyclicity determines sequence type and facies distribution. Sequences with durations of approximately 5 My. include four components that fill and determine basin physiography. Sequences with 1-2 My. durations result in landward-seaward stepping trends of depositional sequences. Depositional sequences comprise two, three, or four components and range in duration from 100,000-400,000 years. A relative sea-level curve deduced from the chronostratigraphy of depositional sequences is compared to a filtered oxygen isotope record. Comparison shows frequencies and trends correlate very well; but magnitudes do not. This correlation implies that glacio-eustasy and depositional sequences are intimately related, and sequence stratigraphic methods are consistent.