Read more
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.
List of contents
Introduction.- Analytical procedures.- Geological background.- The porphyritic monzodioritic-quartz monzodioritic-granodioritic-monzogranitic gneisses.- The medium-grained monzogranite-syenogranites.- The taxitic dioritic-tonalitic gneisses.- The metavolcanic rocks.- Late Neoarchean tectonic setting and geodynamic evolution of the K-rich granitoid belt.- Conclusion.
About the author
Prof. Jinghao Fu now works at School of Geoscience and Technology, Southwest Petroleum University. His main research interests are Precambrian crustal evolution and crust-mantle interaction of the North China Craton. He has won (1) National Scholarship of China, 2017 (2) Chancellor's scholarship of Peking University, 2017 (3) Innovation award (academics) of Peking University, 2017 (4) Excellent doctoral dissertation of Peking University, 2019.
