About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


Proceedings of the International Symposium on Sequence Stratigraphy in S.E. Asia, 1996
Pages 49-71

Biostratigraphic Characterization of Previous HitSystemsNext Hit Previous HitTractsNext Hit in Tertiary Sedimentary Basins

R. J. Morley

Abstract

In Tertiary basins, biostratigraphy can provide much more information about sequence stratigraphy than the identification of condensed sections using foraminiferal, nannofossil and dinocyst abundance and diversity peaks. Palynology may also allow Previous HitsystemsNext Hit Previous HittractsNext Hit to be differentiated by consideration of miospore assemblages which may reflect changes in the character of coastal geomorphology during periods of Previous HitseaNext Hit Previous HitlevelNext Hit fall, Previous HitseaNext Hit Previous HitlevelNext Hit rise or stillstand.

During phases of Previous HitseaNext Hit Previous HitlevelNext Hit fall, lower coastal plain facies, and their associated plant communities, will be of minimal extent, whereas during phases of rising Previous HitseaNext Hit levels, successive drowning of coastal areas often results in a marked expansion in the representation of brackish water plant communities, such as mangroves. Stillstand phases may be marked by coastal progradation and the expansion of upper coastal plain facies and associated freshwater swamp plant communities. Also, in cases where Previous HitseaNext Hit Previous HitlevelNext Hit fluctuations are glacio-eustatic, and hence climatically driven, it may be possible to differentiate highstand from lowstand scenarios through consideration of evidence for climatic change.

Palynological studies of well-dated Quaternary sections from the Southeast Asian area provide excellent analogues which can be used to demonstrate the character of terrestrially derived miospore assemblages during periods of known Previous HitseaNext Hit Previous HitlevelNext Hit fall (e.g. during the time immediately following the last interglacial, after 110,000 yrs BP), Previous HitseaNext Hit Previous HitlevelNext Hit lowstand (e.g. during the last glacial maximum, 25,000 - 17,000 yrs BP), or from the last Previous HitseaNext Hit Previous HitlevelNext Hit rise during the early Holocene, (10,000 - 6,000yrs BP) and subsequent Previous HitseaNext Hit Previous HitlevelNext Hit highstand (6,000 - 0 yrs BP). On the basis of these analogues, a generalized model is proposed which can be applied to the identification of Previous HitsystemsNext Hit Previous HittractsNext Hit within many Southeast Asian basins, as well as Neogene basins from other tropical regions.

Using the proposed model, the biostratigraphic character of each Previous HitsystemsTop tract will be discussed by reference to Neogene examples from the Niger Delta and Southeast Asia.


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