声明
Acknowledgements
Abstract
摘要
Catalogue
Chapter 1 Introduction
1.1.1 The source of intra-plate basalts
1.1.2 Cenozoic alkali basalt in SE China
1.2 H2O in nominally anhydrous minerals and basaltic magma
1.3 Lithium and Oxygen isotopes
1.3.1 Lithium isotopes
1.3.2 Oxygen isotopes
1.4 Objectives of this work
Chapter 2 Geological background and Samples
2.1 Basalt locations and Samples
2.1.1 Cenozoic alkali basalts in the Zhejiang region
2.1.2 Cenozoic alkali basalts and diabases in the Fujian region
2.1.3 Cenozoic basalts in the Hainan Island
Chapter 3 Analytical protocols
3.1 Sample preparations
3.2 Analytical protocols
3.2.1 Major and trace element concentrations of the bulk rocks
3.2.2 Sr-Nd-Pb isotopic compositions of the bulk rocks
3.2.3 Approaches to measure the water content of basalts
3.2.4 Chemical compositions of cpx phenocrysts by EPMA
3.2.5 In-situ Li and O isotopic analysis of cpx phenocrysts
Chapter 4 Calibration of matrix effect in Li isotope analysis of cpx by SIMS
4.1 Calibration of IMF by the composition of cpx
4.2 Applications of Li calibration
4.2.1 Li content and isotope results of cpx grains
4.2.2 Difference between the calibration of Mg# and Si
4.2.3 Discussion of the variation of Li content and Li isotope
4.2.4 Conclusion
Chapter 5 Continuous supply of recycled Pacific oceanic materials in the source of Cenozoic basalts in SE China:the Zhejiang case
5.1 Results
5.1.1 Bulk-rock major and trace elements
5.1.2 Sr-Nd-Pb isotopic compositions
5.1.3 Water content of cpx phenocrysts and equilibrated melts
5.2 Discussions
5.2.1 Source or processes?
5.2.2 H2O content in the initial magmas
5.2.3 Source lithology
5.2.4 Lithospheric or asthenospheric source?
5.2.5 Enriched components in mantle sources
5.2.6 Links between enriched components and Pacific subduction
5.3 Conclusions
Chapter 6 Geochemical heterogeneity in the source of Cenozoic basaltic rocks in the Fujian region
6.1.1 Bulk-rock major and trace elements
6.1.2 Sr-Nd-Pb isotopic compositions
6.1.3 Chemical and isotopic composition of cpx phenocrysts
6.2 Discussions
6.2.1 Crustal/peridotite assimilation and fractional crystallization
6.2.2 Variation of δ7Li and Li content
6.2.3 H2O content of initial magma
6.2.4 Origin of the oxygen isotopic anomaly
6.2.5 Mantle heterogeneity and recycled component
6.2.6 Implications for the mantle source
6.3 Conclusions
Chapter 7 Hainan basalts and the spatial chemical variation of Cenozoic basalts in East China
7.1 Results
7.1.1 Bulk-rock major and trace element compositions
7.1.2 Chemical and isotopic composition of cpx phenocrysts
7.2 Discussions
7.2.2 Water contents of the Hainan basalts
7.2.3 The abnormal Oxygen isotope in Hainan basalts
7.2.4 The recycled materials in Hainan basalts
7.3 The variation of geochemistry for Cenozoic basalts depended on latitude
7.4 Conclusions
Chapter 8 Conclusions
References
Published Papers
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