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Multivariate statistical analysis of palynodebris from the middle Miocene of the Niger Delta and their environmental significance

Francisca E. Oboh
Multivariate statistical analysis of palynodebris from the middle Miocene of the Niger Delta and their environmental significance
Palaios (December 1992) 7 (6): 559-573

Abstract

Fourteen types of palynodebris have been identified in Middle Miocene reservoir sediments from the Niger Delta. They include palynomorphs, cuticle, parenchyma, resins, black debris, woody fragments and degraded components. The palynodebris types were interpreted by Principal Components Analysis and Average Linkage Cluster Analysis. Four assemblages of samples emerged and they have been grouped into two palynofacies associations, A/C and B/D, because of their correlation with mudstone and muddy heterolithic lithofacies and sandstone lithofacies, respectively. The significant palynodebris components are black debris, parenchyma, resins and amorphous organic matter. The size, shape and texture of all the components were integrated with sedimentological features, palynomorph and foraminiferal assemblages to recognize seven, possibly eight, deltaic sub-environments of deposition in the reservoir. Mudstones and muddy heteroliths from low energy depositional environments are characterized by small-sized, lath-shaped woody debris, and high concentration of buoyant components such as palynomorphs, cuticles and degraded bundles. The sandstones contain larger and more equidimensional woody fragments. These sediments are also richer in black debris which are believed to be a function of exposure to oxidizing conditions for a longer period of time. Parenchyma and resins, though rare, are characteristic of distributary channel-fill sandstones.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 7
Serial Issue: 6
Title: Multivariate statistical analysis of palynodebris from the middle Miocene of the Niger Delta and their environmental significance
Author(s): Oboh, Francisca E.
Affiliation: University of Missouri-Rolla, Department of Geology and Geophysics, Rolla, MO, United States
Pages: 559-573
Published: 199212
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 61
Accession Number: 1993-012690
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 3 tables, sketch maps
N04°15'00" - N05°00'00", E05°00'00" - E07°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 1993
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