Formation and Crust-Mantle Geodynamic Processes of the Neoarchean K-rich Granitoid Belt in the Southern Range of Eastern Hebei-Western Liaoning ... Northern North China Craton (Springer Theses)

Meso- to Neoarchean is a critical transitional period for the formation and evolution of continental crust and the corresponding geodynamic mechanisms, during which the average composition of continental crust gradually shifted from Na-enriched to K-enriched. However, the ultimate source of K and its enrichment mechanism in continental crust are still enigmatic. Moreover, fierce controversies remain on the Precambrian subdivision and late Archean geodynamic models of the North China Craton (NCC). Archean basement terranes in the Eastern Hebei-Western Liaoning Provinces, northern NCC display characteristic lithological zonation similar to those developed in modern convergent plate margins, and from northwest to southeast can be subdivided into the MORB-type tholeiite belt, oceanic arc tectonic belt, and K-rich granitoid belt. This book reports systematic field geological, petrographic, structural, whole-rock geochemical, and zircon U-Pb-Hf-O isotopic data for the various late Neoarchean lithological assemblages of the K-rich granitoid belt. Their deformational characteristics and petrogenesis are discussed in detail, and integrated with their spatiotemporal relationships and metamorphic features, a late Neoarchean active continental margin setting with multi-stage trench retreats and subsequent arc-continent collision is proposed to account for the formation and evolution of the K-rich granitoid belt. It also throws light upon the ultimate source and enrichment mechanism of K in the late Archean continental crust by comparing K-rich granitoid belt with the adjacent oceanic arc tectonic belt. Supervisor’s Foreword Acknowledgements Contents 1 Introduction 1.1 Research Background 1.1.1 Meso- to Neoarchean Transformation of Geodynamic Mechanisms 1.1.2 Late Archean Granitoid Diversity and Their Petrogenesis 1.2 Research Progress and Key Issues of Early Precambrian Research in the North China Craton 1.2.1 Research Progress of Early Precambrian Research in the North China Craton 1.2.2 Key Scientific Issues 1.3 Objectives of This Thesis 1.4 Research Contents of This Thesis 1.5 Methodology 1.5.1 Whole-Rock Major Oxide Analyses 1.5.2 Whole-Rock Trace Element Analyses 1.5.3 Zircon Oxygen Isotope Analyses 1.5.4 Zircon U–Pb Isotope Analyses 1.5.5 Zircon Lu–Hf Isotope Analyses References 2 Geological Background 2.1 Tectonic Framework of the North China Craton Metamorphic Basement 2.2 Geological Background of the Eastern Hebei-Western Liaoning Provinces 2.3 Structural Geology of the K-rich Granitoid Belt 2.3.1 The Jinzhou-Saheqiao Thrust Nappe Structural Zone 2.3.2 The Jinzhou-Xingcheng Tectonic Domain 2.3.3 The Jielingkou-Anziling-Suizhong Tectonic Domain 2.3.4 The Shuangshanzi-Qian’an-Lulong Tectonic Domain 2.3.5 The Taipingzhai-Zunhua Tectonic Domain References 3 Porphyritic Monzodioritic-Quartz Monzodioritic-Granodioritic-Monzogranitic Gneisses and Their Tonalitic Gneiss Xenoliths 3.1 Geological and Petrographic Features 3.2 Zircon U-Pb and Lu-Hf Isotopes 3.2.1 The Tonalitic Gneiss Xenolith 3.2.2 The Porphyritic MQGM Gneisses 3.3 Whole-Rock Geochemical Features 3.3.1 The Tonalitic Gneiss Xenolith 3.3.2 The ADG Porphyritic MQGM Gneisses 3.3.3 The BDG Porphyritic MQGM Gneisses 3.4 Petrogenetic Discussion 3.4.1 Assessment of Element Mobility 3.4.2 The Tonalitic Gneiss Xenolith 3.4.3 The ADG Porphyritic MQGM Gneisses 3.4.4 The BDG Porphyritic MQGM Gneisses References 4 Medium-Grained Monzogranite-Syenogranites 4.1 Geological and Petrographic Features 4.2 Whole-Rock Geochemical Features 4.2.1 Major Element Compositions 4.2.2 Trace Element Compositions 4.2.3 Zircon Saturation Temperatures 4.3 Zircon U–Pb and Lu–Hf Isotopes 4.3.1 The High REE Group 4.3.2 The Low REE Group 4.4 Petrogenetic Discussion References 5 Taxitic Dioritic-Tonalitic Gneisses 5.1 Geological and Petrographic Features 5.2 Whole-Rock Geochemical Features 5.2.1 The Dioritic-Quartz Dioritic (DQ) Group 5.2.2 The Tonalitic-Trondhjemitic (TT) Group 5.3 Zircon U–Pb and Lu–Hf Isotopes 5.3.1 The HNDQ Subgroup 5.3.2 The LNDQ Subgroup 5.3.3 The LFTT Subgroup 5.3.4 The HFTT Subgroup 5.4 Petrogenetic Discussion 5.4.1 Assessment of Element Mobility 5.4.2 The HNDQ and LFTT Subgroups 5.4.3 The LNDQ Subgroup 5.4.4 The HFTT Subgroup References 6 Lower Sequence Metavolcanic Rocks 6.1 Geological and Petrographic Features 6.2 Whole-Rock Geochemistry 6.2.1 The Basaltic-Andesitic Group 6.2.2 The High-MgO Dacitic Group 6.2.3 The Low-MgO Dacitic Group 6.3 Zircon U–Pb and Lu–Hf Isotopes 6.3.1 The Basaltic-Andesitic Group 6.3.2 The High-MgO Dacitic Group 6.3.3 The Low-MgO Dacitic Group 6.4 Petrogenetic Discussion 6.4.1 Assessment of Element Mobility 6.4.2 The Basaltic-Andesitic Group 6.4.3 The High-MgO Dacitic Group 6.4.4 The Low-MgO Dacitic Group References 7 Upper Sequence Metavolcanic Rocks 7.1 Geological and Petrographic Features 7.2 Whole-Rock Geochemical Features 7.2.1 The MB-1 Group 7.2.2 The MB-2 Group 7.2.3 The MB-3 Group 7.2.4 The MA Group 7.2.5 The MD Group 7.3 Zircon U–Pb and Lu–Hf Isotopes 7.4 Petrogenetic Discussion 7.4.1 The MB-1 Group 7.4.2 The MB-2 Group 7.4.3 The MB-3 and MA Groups 7.4.4 The MD Group References 8 Late Neoarchean Tectonic Setting and Geodynamic Processes of the K-rich Granitoid Belt 8.1 Late Neoarchean Geological Events of the K-rich Granitoid Belt 8.2 Archean Crustal Growth of the K-rich Granitoid Belt 8.3 Late Neoarchean Tectonic Setting of the K-rich Granitoid Belt 8.4 Late Neoarchean Geodynamic Model of the K-rich Granitoid Belt References 9 Concluding Remarks