| Autor: |
Yan Yang, Franz Neubauer, Zheng Liu, Guo-Chang Wang, Shu-Cheng Tan, Xiao-Hu He, Chen-Yue Liang |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Geosystems and Geoenvironment, Vol 3, Iss 3, Pp 100289- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2772-8838 |
| DOI: |
10.1016/j.geogeo.2024.100289 |
| Popis: |
Accessible silicate reservoirs on Earth (i.e., the depleted mantle and continental crust) are depleted in Nb relative to chondrites, as expressed by their subchondritic Nb/Ta ratios. Mixtures of continental crust and depleted mantle cannot produce chondritic Nb/Ta ratios; therefore, another geochemical reservoir with a superchondritic Nb/Ta ratio is necessary to balance the low Nb contents of the continental crust. We investigated alkaline igneous rocks with superchondritic Nb/Ta ratios (20.4–24.8). Their high Nb/Ta ratios were inherited from their lithospheric mantle source rather than being produced by magmatic differentiation. Geochemical data show that an enriched mantle domain with superchondritic Nb/Ta ratios can be produced by the interaction of subducted carbonate-rich sediment-derived melts with the lithospheric mantle, and the enriched lithospheric mantle is a potential superchondritic reservoir. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
