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Table of contents
Abstract
Chapter 1. General introduction
1.1. Background and scientific issues
1.2. Research contents and methodology
1.2.1. Research purpose and contents
1.2.2. Methodology
1.3. Workload of the study
1.4. Major findings and innovations
Chapter 2. Regional geological outline of North China
2.1. Tectonic setting of the North China Block and its adjacent area
2.2. Tectonic evolution of the Triassic-earliest Cretacous basins
2.2.1. Triassic
2.2.2. Early-Middle Jurassic
2.2.3. Event A of the Yanshanian Orogeny
2.2.4. Intermediate phase of the Yanshanian Orogeny
2.2.5. Event B of the Yanshanian Orogeny
2.3. Triassic-Jurassic magmatism
Chapter 3. Emplacement of the Late Triassic granitic Dushan pluton
3.1. Introduction
3.2. Geological overview of the YFTB
3.3. Field Observations in the Dushan pluton
3.3.1. Lithological Units and Bulk Architecture
3.3.2. Fabric and Structure of the Dushan Pluton
3.4. Microscopic Observation
3.5. New Dating Results
3.6. Measurement of Anisotropy of Magnetic Susceptibility
3.6.1. Sampling and Measurements
3.6.2. Magnetic Susceptibility Carrier
3.6.3. Anisotropy Degree and Shape Parameter
3.6.4. Fabric Pattern and Comparison with Mesoscopic Fabric
3.7. Gravity Modeling
3.8. Discussion
3.8.1. A continuum of fabric variation from magmatic to solid-state conditions in the Dushan pluton
3.8.2. Emplacement mode
3.8.3. Tectonic implication
Chapter 4. Emplacement of the Late Triassic granitic Wangtufang pluton
4.1. Introduction
4.2. Geological setting
4.3. Structural observations
4.3.1. Field observations
4.3.2. Microscopic observations
4.4. Geochronology and geochemistry
4.4.1. Zircon U–Pb geochronology
4.4.2. Major and trace elements analyses
4.4.3. In-situ zircon Hf isotopes
4.5. Anisotropy of magnetic susceptibility
4.5.1. Magnetic mineralogy
4.5.2. AMS results
4.6. Gravity modeling
4.6.1. Residual Bouguer anomaly and 2D modeling
4.6.2. Results
4.7. Discussion
4.7.1. Magma sources of the Wangtufang pluton
4.7.2. Emplacement model
4.7.3. Relationships between the pluton emplacement and regional tectonics
Chapter 5. Emplacement of the Jurassic Jianchang-Jiumen pluton
5.1. Introduction
5.2. Geological Setting
5.2.1. Tectonic setting
5.2.2. Jurassic Geological Overview of the NCB
5.2.3. Jianchang-Jiumen pluton
5.3. Structural Observations
5.3.1. Field observations
5.3.2. Microscopic Observations
5.4. SIMS zircon U-Pb Dating
5.5. Anisotropy of magnetic susceptibility (AMS)
5.5.1. Sampling and Measurements
5.5.2. Magnetic Mineralogy
5.5.3. Fabric Patterns of the Jianchang-Jiumen pluton
5.6. Gravity Modeling
5.6.1. Residual Bouguer anomaly map
5.6.2. 2D gravity modeling
5.7. Discussion
5.7.1. Significance of Magnetic Fabrics
5.7.2. Emplacement Modes and Their Bearings on the Regional Tectonics
Chapter 6. Early Mesozoic tectonic framework of the northern North China Block and geodynamic mechanism
6.1. Early Mesozoic tectonic framework of the northern NCB
6.1.1. Early-Middle Triassic N-S compression in the northern NCB
6.1.2. Late Triassic NE-SW extension in the northern NCB
6.1.3. Early Jurassic-early Middle Jurassic N-S extension in the western NCB and NW-SE extension in the eastern NCB
6.1.4. Late Middle Jurassic N-S compression
6.1.5. Early Late Jurassic NE-SW extension in the eastern NCB
6.1.6. Late Late Jurassic-Early Cretaceous NW-SE large-scale compression and extension
6.2. Discussion of geodynamic mechanism
Chapter 7. Conclusions and Perspectives
7.1. Conclusions
7.2. Perspectives
References
