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- W4313366946 abstract "Abstract The chemical composition of continental crust is fundamental and crucial to understanding its origin and evolution. Orogenic belts make up about 30% of the global continental crust, yet their chemical compositions are still poorly constrained. In this study, we report an overall estimate for the continental crust composition of a collisional orogenic belt terrane: the Southeast China. The estimate is obtained through a 3‐D crustal model combining a lithology proportion model and probability density function models for element concentrations of various lithologies. Based on our model, the Southeast China crust is amongst one of the most evolved continental crust composition estimates (71.0% SiO 2 content for the upper crust and 64.7% SiO 2 for the bulk crust). A strong correlation between SiO 2 and the chemical index of alteration (CIA) of different composition models for upper continental crust (UCC) indicates that chemical weathering is a controlling factor for the development of a felsic UCC. In contrast, weak correlations of SiO 2 with Ni norm (15.9*Ni/Al 2 O 3 ) and CIA suggest that igneous differentiation and chemical weathering act together to modify the composition of the bulk continental crust. Orogenic belt terranes like the Southeast China can develop a highly evolved crustal composition, especially for the upper crust, due to extensive intracrustal reworking and differentiation, enhanced chemical weathering, and potential subsequent delamination and removal of thickened crust root. Therefore, an overall estimation of the average composition of continental crust should take into account the more evolved composition of orogenic belts." @default.
- W4313366946 created "2023-01-06" @default.
- W4313366946 creator A5004852242 @default.
- W4313366946 creator A5032081267 @default.
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- W4313366946 creator A5054332012 @default.
- W4313366946 creator A5062441269 @default.
- W4313366946 creator A5070223373 @default.
- W4313366946 creator A5070886624 @default.
- W4313366946 date "2022-12-01" @default.
- W4313366946 modified "2023-10-12" @default.
- W4313366946 title "Composition and Evolution of Continental Crust at Orogenic Belts: Constraints From a 3‐D Crustal Model of Southeast China" @default.
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