尼日利亚东北部Hawal地块泛非花岗岩类和铀矿化的地球化学和地质年代学研究

目录

声明

摘要

Abstract

Catalogue

Figure captions

Table captions

Chapter 1 Introduction

1．1 The concept of plate tectonics

1．1．1 The subduction zones

1．2 Collisional orogenic processes and magmatism

1．2．1．Magmatism in Orogenic belt and their geochemical signatures

1．3 Growth and reworking of the Earth’s continental crust

1．4 The Pan-African orogeny

1．4．1 The west Gondwana orogeny(WGO)

1．4．2 The Gondwana Assembly

1．4．3 The concept of Pan-African displaced terranes

1．5 The Geological setting of Nigeria

1．6Aim of this work

2．1 Sampling

2．2 Microscopy，Scanning Electron Microscopy，and Electron Probing Micro-analyser

2．3 Whole-rock geochemistry

2．4 Zircon U-Pb dating

2．5 Zircon Lu-Hf isotopic measurement

Chapter 3 Petrogenesis of the Hawal Massif granitoids

3．1 Local geological background

3．2 Petrography

3．2．1 Modal composition and classification

3．2．2 Textural features

3．3 Results

3．3．1 Mineral Chemistry

3．3．2 Zircon U-Pb dating and trace element

3．3．3 Whole-rock geochemistry

3．3．4 Zircon Lu-Hf isotopes

3．4 Discussion

3．4．1 Geochemical classification of Hawal Massif granitoids

3．4．2 The estimated crystailisation parameters of Hawal Massif granitoids

3．4．3 Petrogenesis of the Hawal Massif granitiods

3．4．4 Tectonic evolution

3．5 Highlights

Chapter 4 The Kanawa uranium mineralization of HawaI Massif

4．1 Introduction

4．2 The eastern Nigerian terrane uranium mineralization

4．3 Results

4．3．1 Alteration and mineralization studies

4．4 The geochemical features of the host granites

4．4．1 The Hawal Massif granite and rhyolite

4．5 Trace element composition of the Kanawa fault rocks

4．6 Zircon studies

4．6．1 Zircon morphology and composition

4．6．2．Zircon U-Pb geochronology

4．7 Discussion

4．7．1 Kanawa U mineralization：textural，mineralogical and geochemical features

4．7．2 Interpretation of zircon U-Pb ages

4．7．3 The U source

4．7．4 Implications for regional U mineralization

4．7．5 Genetic model

4．8 Highlights

Chapter 5 Summary and conclusions

References

Acknowledgement

Academic Articles and Research Outcomes During the Study Period

Appendices

Supplementary data