Assessing the paleoenvironmental evolution of the Niger Delta basin using detrital zircon U-Pb dating and sedimentary facies analysis

Project Abstract

This study integrates detrital zircon U-Pb dating with comprehensive sedimentary facies analysis to reconstruct the paleoenvironmental evolution of the Niger Delta basin, focusing on diachronous tectono-sedimentary processes from the Cretaceous to the Neogene. By compiling a high-resolution detrital zircon dataset (n > 200 grains) sourced from representative well cores and outcrop sections across the deltaic to lacustrine environments, we establish maximum depositional ages, provenance signatures, and magmatic-hydrous episodes that record major tectono-magmatic events and hinterland erosion intensity. Coupled with petrographic and mineralogical analyses, heavy mineral assemblages, and whole-rock geochemistry, the study delineates shifts in sedimentary regimes from fluvial-deltaic to tropical-marine and delta-front progradation to retrogradation stages. Detrital zircon age spectra reveal multi-stage sourcing from Pan-African to Neoproterozoic basement and Cenozoic volcanic arcs, indicating episodic uplift, drainage reorganization, and climatic modulations influencing sediment supply. Heterogeneous depositional facies, including channel-fill sandstones, levee and crevasse-splay deposits, mouth-bar sands, pro-delta mudstones, and coastal dune systems, are correlated with sea-level fluctuations and Delta lobe-switching events as constrained by sequence stratigraphy and chemostratigraphic markers (stable isotopes, trace elements). The integration of zircon crystallization ages with basin modeling enables reconstruction of the maximum paleorelief and hinterland denudation rates, thereby inferring periods of enhanced tectonic uplift in the African hinterland and subsidence within the Niger Delta depocenter. Sedimentary facies analyses identify climatic signals manifesting as variations in sediment grain size, mineralogical maturity, and porosity-permeability trends, which are cross-validated with palynology, calcareous microfossils, and magnetostratigraphy to refine chronostratigraphic frameworks. The study also evaluates diagenetic alterations and their impact on detrital zircon inclusion populations, ensuring robust provenance interpretation. Outcomes include a refined composite stratigraphic framework for the Niger Delta, a chronology of deltaic lobe switching events, and a quantified linkage between hinterland tectonics, sediment supply, sea-level dynamics, and climate variability. The research provides actionable insights into hydrocarbon reservoir architecture, including sandstone body connectivity, reservoir quality evolution through diagenesis, and seal integrity across tectonically active intervals. By delivering an integrated, multi-proxy paleoenvironmental reconstruction, this work advances understanding of deltaic system evolution in rift-to-passive margin transitions and offers a methodological blueprint for similar basin studies inWest Africa and other complex tropical deltaic settings.

Project Overview

What This Project Is About

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A plain-language overview of the topic and what the project investigates.

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The Problem It Addresses

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What problem or gap this project tackles and why it matters to the field or society.

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Objectives of the Project

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1. Identify the main environmental conditions of the Niger Delta basin during different geological times.
2. Apply detrital zircon dating to date sediment sources and track sediment pathways.
3. Interpret sedimentary facies to infer past water depth, energy, and deposition settings.
4. Propose how paleoenvironmental changes affected landscape evolution and hydrocarbon potential.

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What You Will Do Step by Step

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1. Review basic geology of the Niger Delta and relevant dating methods.

2. Collect or access sediment samples from field or existing datasets.

3. Perform detrital zircon U-Pb dating in a lab and interpret ages.

4. Analyze sedimentary facies from core descriptions and outcrop data.

5. Integrate age data with facies interpretations to reconstruct paleoenvironmental evolution.

6. Compare findings with regional tectonics and sea-level changes.

7. Discuss uncertainties and limits of the study.

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Expected Outcome

Clear timelines for sediment sources and environmental shifts, a model of past delta evolution, and implications for natural resource potential and regional geology education.