声明
Acknowledgements
Abstract
摘要
Table of contents
1 Introduction
1.1 Background and motivation
1.2 Thesis outline
2 Geological background and previous works
2.1 The North China Craton
2.2 Lithospheric thinning and the destruction of the NCC
2.3 The Dabie-Sulu UHP Belt
2.4 Localities and samples
2.4.1 Qixia
2.4.2 Penglai
2.4.3 Changle
2.4.4 Hebi
2.4.5 Qingdao
2.4.6 Daxizhuang
2.4.7 Junan
3 Analytical methods
3.1 Electron microprobe (EMP)
3.2 LA-ICP-MS
3.3 Fourier transform infrared spectroscopy (FTIR)
3.3.1 Water content in NAMs measured by FTIR
3.3.2 The theoretical background for quantitative analysis
3.4 Secondary ion mass spectrometry (SIMS)
4 Results
4.1 EMP results
4.1.1 Major elements concentrations
4.1.2 Temperature and Pressure estimates
4.2 LA-ICP-MS results for Trace element
4.3 FTIR results
4.3.1 H-related species in mineral structural
4.5 SIMS results for Lithium contents and isotopic compositions
4.5.1 PengLai samples
4.5.2 Qixia samples
4.5.3 Hebi samples
4.5.4 Junan samples
5 The melt depletion and enrichment process
5.1 Melt depletion
5.1.1 Melt depletion in the mantle sources
5.1.2 The estimate of extents of mantle melting
5.2 The fluids/melts enrichments
6 Water in the lithospheric mantle
6.1 Preservation of initial water content of mantle pyroxenes
6.2 Possible factors controlling water contents of pyroxenes
6.3 Low water content of peridotites hosted by Cenozoic basalts
6.3.1 Comparison with the continental craton and off-craton lithospheric mantle
6.3.2 Comparison with the oceanic mantle
6.3.3 Possible Role of Redox State on Water Content
6.3.4 Implications of the Low Water Content
6.3 High water contents in the Mesozoic lithospheric mantle
7 Lithium isotopic systematics of the lithospheric mantle
7.1 Lithium infiltration and disequilibria in peridotites
7.2 The Li enrichments and mantle metasomatism
7.3 Lithium isotopic fractionation in peridotites
7.3.1 The isotopic fractionation at high temperature
7.3.2 The diffusion-driven isotopic fractionation
7.3.3 The quantitative simulation of Li diffusion
7.4 The Li-rich influx with anomalous isotopic compositions
7.4.1 The low δ7Li influx
7.4.2 The recent high δ7Li influx
7.5 The anomalous Li isotopic domains in the mantle and their origins
7.5.1.The heavy Li domains in the mantle
7.5.2.The light Li domains in the mantle
7.6 The melt-rock interactions beneath the NCC
7.6.1 The melt-rock interactions and the re-fertilization
7.6.2 The Li enrichments and the water depletion
8 Conclusions
References
Related publications and manuscripts
Appendix