Multivariate statistical analyses of palynodebris from the Middle Miocene of the Niger Delta and their environmental significance

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Palaios; (United States)

DOI:https://doi.org/10.2307/3514869· OSTI ID:6426633

Oboh, F E ^[1]

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1. Univ. of Missouri, Rolla (United States)

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. 59 refs., 7 figs., 3 tabs.

• OSTI ID: 6426633
• Journal Information: Palaios; (United States), Journal Name: Palaios; (United States) Vol. 7:6; ISSN PALAEM; ISSN 0883-1351
• Country of Publication: United States
• Language: English

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