Crustal Thickeness and Topographic Elevation:Insights from Geochemistry of Igneous Rocks
Understanding the evolution of continental crust is crucial for comprehending the Earth's structure and exploring the development of plate tectonics and orogenic belts.In convergent plate margins,large-scale igneous rocks are generated,and their geochemical features are closely related to their formation depth.Consequently,these rocks are widely used in reconstructing crustal thickness and interpreting paleoaltitudes in orogenic belts.In this paper it reviews the establishment and development of methods that utilize geochemical information to investigate crustal thickness.It evaluates the advantages,disadvantages,and applications of various methods,and summarizes their use in different orogenic belts and their role in paleoaltitude reconstruction.As a complement to quantitative paleoaltimetric techniques,the geochemical approach provides more continuous reflections of crustal thickness over time.Combined with rapidly accumulating geochemical databases,this method can offer deeper insights into paleoaltitude estimates,and the tectonic evolution of orogenic belts,and effectively promote the development of Earth system science.
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