Geology and Petrochemistry of Granitic Pegmatite in Jema’a Pegmatite Field, Kaduna State

Inhaltsverzeichnis (Table of Contents)

• Introduction

  • General Statement
  • Statement of the Problem
  • Aims and Objectives of the Present Work
  • Scope of the Present Work

• Literature Review

  • Geologic Setting

• Materials and Methods

  • Materials Required
  • Exploration Method
  • Field Methods
  • Sampling
  • Laboratory Methods
  • Field Analysis
  • Sample Preparation
  • Sample Analysis
  • Conceptual Model Theories
  • Past
  • The Present

  • Results

    • Petrographic Studies
    • Macro and Microscopic Studies
    • Granitoids
    • Biotite-Muscovite Granite (BMG)
    • Albite Granite (AG)
    • Granite Aplite (GA)
    • Host Rocks
    • Amphibolite (AMP)
    • Migmatite (MG)
    • Feldspars
    • Microcline Perthite (group 1)
    • Albite Antipethite (group 2)
    • Albite (group 3)
    • Mica
    • Coarse Muscovite (group 1)
    • Muscovite (group 2)
    • Recrystallized Medium Muscovite (group 3)
    • Tourmaline
    • Tourmaline (group T1)
    • Tourmaline (group T2)
    • Geochemistry
    • Major and Minor Elements Geochemistry
    • Interpretations of CIPW Norm
    • Thomton and Turtle, (1960) Differentiation Index
    • Interpretation of Niggli Norm
    • Classification of Granites after Chappell and White (1974)
    • Evidence from Magmatic Experiments
    • Petrochemistry of Rare Elements Granitoids and Pegmatites
    • Aluminum Saturation Index (A/CNK)
    • Variation (wt %) of CaO – NaO – K2O in Granitoids and Pegmatites
    • Classification of Granitoids using Q – A – P Diagram
    • Variation (ppm) of Rb – Ba – Sr for Differentiation of Granitoids
    • Trace Element Geochemistry
    • Trace Elements
    • Mineral Chemistry
    • Feldspars
    • Micas
    • Muscovites
    • Biotitic Material
    • Tourmaline
    • Tectonic Setting Discrimination of the Research Area
    • Fertile Granite in Aluminum Saturation Index Diagram coded by Tectonic Affiliation and Geochemical Signature
    • Tectonic Classification based on SiO2 Content and K2O/Na2O ratio
    • Rb (ppm) versus Nb + Y (ppm)
    • Lithological and Structural Relationships

    • Discussion of Results

      • Granitoids
      • Rare Elements as Exploration Tool
      • Feldspars
      • Muscovites
      • Tourmalines
      • Petrogenesis
      • Petrogenic Model

    • Conclusions and Recommendation

      • Conclusions
      • Recommendations

    Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)

    The main objective of this research is to conduct a systematic geologic study of granitic pegmatites in the Jema'a pegmatite field, Kaduna State, Nigeria, in relation to the adjoining granitoids. This involves understanding the geology and geodynamic evolution of the pegmatites, determining their mineralogical and geochemical characteristics, evaluating their economic mineral potential, and relating them to tectonic regimes and magma generation processes.

    • Geochemistry and Petrochemistry of Granitic Pegmatites
    • Tectonic Setting and Magma Generation
    • Economic Mineral Potential of Pegmatites
    • Regional Zonation and Mineral Associations
    • Petrogenesis of Rare-Element Pegmatites

    Zusammenfassung der Kapitel (Chapter Summaries)

    Chapter One: Introduction provides an overview of the research area, the significance of the Jema'a pegmatite field, and outlines the aims and objectives of the study. The chapter also discusses the scope of the work, including the methods employed for data collection and analysis.

    Chapter Two: Literature Review presents a comprehensive review of relevant literature on the geological setting of the Nigerian Basement complex, the Pan-African orogeny, and the genesis and exploration of rare-element pegmatites. The chapter provides a foundation for understanding the context of the research and the current state of knowledge in the field.

    Chapter Three: Materials and Methods details the materials used and the methods applied in the research. It covers field work, sampling techniques, laboratory procedures for sample preparation and analysis, and the conceptual models used to interpret the data. The chapter provides a clear explanation of the methodologies employed to ensure the reliability and reproducibility of the findings.

    Chapter Four: Results presents the findings of the study. The chapter analyzes the petrographic characteristics of the granitoids and pegmatites, including their mineral composition, textures, and structural features. It further examines the geochemical data, including major, minor, and trace elements, to understand the chemical evolution of the pegmatite-forming melts and their relationship to the host rocks. The chapter also discusses the tectonic setting discrimination of the research area and the lithological and structural relationships observed in the field.

    Chapter Five: Discussion of Results interprets the findings of the study and discusses their implications. The chapter connects the petrographic and geochemical data to understand the petrogenesis of the rare-element pegmatites. It discusses the role of fractionation, the importance of fluxes, and the influence of the tectonic setting on the formation and evolution of the pegmatites. The chapter also highlights the potential of the research area for rare-element mineralization.

    Schlüsselwörter (Keywords)

    This study examines the geology and petrochemistry of granitic pegmatites in the Jema'a pegmatite field, Kaduna State, Nigeria. Key terms and concepts include: rare-element pegmatites, fertile granites, aluminum saturation index (A/CNK), fractionation, tectonic setting discrimination, Pan-African orogeny, lithological relationships, and economic mineral potential.